CN120638430A - Subway flywheel energy storage system with DC ice melting function and ice melting energy storage method - Google Patents
Subway flywheel energy storage system with DC ice melting function and ice melting energy storage methodInfo
- Publication number
- CN120638430A CN120638430A CN202511133434.3A CN202511133434A CN120638430A CN 120638430 A CN120638430 A CN 120638430A CN 202511133434 A CN202511133434 A CN 202511133434A CN 120638430 A CN120638430 A CN 120638430A
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- China
- Prior art keywords
- energy storage
- subway
- power
- power switch
- flywheel
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for AC mains or AC distribution networks
- H02J3/28—Arrangements for balancing of the load in networks by storage of energy
- H02J3/30—Arrangements for balancing of the load in networks by storage of energy using dynamo-electric machines coupled to flywheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/16—Devices for removing snow or ice from lines or cables
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy specially adapted for power networks
- H02J15/30—Systems for storing electric energy specially adapted for power networks using storage of inertial or mechanical energy, e.g. using flywheels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/02—Conversion of DC power input into DC power output without intermediate conversion into AC
- H02M3/04—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
- H02M3/06—Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
- H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
- H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/487—Neutral point clamped inverters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
本发明公开了一种兼具直流融冰功能的地铁飞轮储能系统，包括中压环网、接触网、走行轨和正、负母线，还包括：地铁整流模块和飞轮储能模块；地铁整流模块与正、负母线连接；正母线与接触网连接，所述的负母线与走行轨连接；飞轮储能模块分别与正母线、负母线及走行轨连接；飞轮储能模块还通过断路器QF与接触网连接，接触网与走行轨之间通过远端短接开关K3连接。本发明还公开了一种应用上述兼具直流融冰功能的地铁飞轮储能系统融冰储能方法。本发明兼具直流融冰与飞轮储能充放电两种功能，两种功能通过开关控制分时复用，实现设备的高效利用，提高性价比。
The present invention discloses a subway flywheel energy storage system with a DC ice-melting function, comprising a medium-voltage ring network, a contact network, running rails, and positive and negative busbars, and further comprising: a subway rectifier module and a flywheel energy storage module; the subway rectifier module is connected to the positive and negative busbars; the positive busbar is connected to the contact network, and the negative busbar is connected to the running rails; the flywheel energy storage module is respectively connected to the positive busbar, the negative busbar, and the running rails; the flywheel energy storage module is also connected to the contact network via a circuit breaker QF, and the contact network and the running rails are connected via a remote short-circuit switch K3. The present invention also discloses an ice-melting and energy storage method using the above-mentioned subway flywheel energy storage system with a DC ice-melting function. The present invention combines the dual functions of DC ice-melting and flywheel energy storage charging and discharging, and the two functions are time-shared and multiplexed through switch control to achieve efficient utilization of the equipment and improve cost-effectiveness.
Description
Technical Field
The invention relates to the technical field of transportation, in particular to a subway flywheel energy storage system with a direct-current ice melting function and an ice melting energy storage method.
Background
The subway has a plurality of advantages as a mode of daily travel of citizens, so that the subway is developed in a rapid way. Subway trains face problems while developing rapidly. Firstly, how to recycle the regenerative braking energy of the subway has important effects of reducing energy consumption, inhibiting the fluctuation of the network voltage of the overhead line system and improving the stability of a power supply system. In the existing mainstream subway regenerative braking energy utilization technology, flywheel energy storage is the optimal scheme. The basic principle of the device is that when subway braking generates regenerative braking energy and the voltage of the direct current contact network is raised, the flywheel energy storage device stores the regenerative braking energy which cannot be absorbed by the adjacent vehicle as mechanical energy, and then the stored mechanical energy is converted into electric energy to be released when the direct current contact network voltage drops due to subway traction, so that the effects of energy conservation and voltage stabilization are achieved. Secondly, when the metro vehicle adopts an overhead contact system to supply power, the influence on the contact network is particularly remarkable in rainy and snowy freezing weather. The overhead contact system is an important power supply facility for providing electric energy for subway traction, and when ice coating occurs on the surface of the overhead contact system, normal current taking of a pantograph can be seriously influenced, and the reliability of subway power supply is reduced, so that driving safety is threatened. The ice coating of the small-range line can be removed by adopting a manual or mechanical method (such as knocking by tools such as mallet) and high-pressure steam ice melting, but for the large-range and long-distance line, the method has low efficiency and poor ice removing effect. Therefore, the advanced and reliable ice melting device is arranged in the traction substation to safely and rapidly remove the ice coating of a large-scale contact net, and the method has very important economic and social significance. From the current technical level at home and abroad, the direct current ice melting technology is the most mature and feasible ice melting means, and the basic principle is to melt the ice layer by utilizing the heat energy generated by direct current on the wire.
Nowadays, flywheel energy storage devices are researched and applied to urban rail transit systems at home and abroad. The DC deicing technology is applied to the power transmission line in a mature mode, corresponding researches are also carried out on DC deicing of the electrified railway overhead contact system, and manufacturers such as plant electric locomotive factories, relay groups and the like carry out researches on DC deicing of the overhead contact system, but the DC deicing technology is not adopted for urban rail transit lines in China. In recent years, a direct current deicing device with a reactive power compensation function (SVG) is attractive, has both the reactive power compensation function and the direct current deicing function, is convenient to switch, is economical and effective, and mostly adopts half-bridge type, full-bridge type and mixed MMC topological structures.
The existing subway energy feed device and the existing DC ice melting device are single in function. If the subway energy feedback device only has the functions of recovering subway regenerative braking energy and stabilizing the voltage of the direct current overhead contact system, the direct current ice melting device only has the ice melting function, and can be used only when the overhead contact system is covered with ice, and the idle time is long. If the traction substation needs the two functions, two sets of equipment are required to be configured, the occupied area of the equipment is large, and the cost of purchasing the equipment is high.
The existing flywheel energy storage device and the existing direct current ice melting device are single in function. If the flywheel energy storage device has the functions of energy storage, charge and discharge, the direct-current ice melting device has the ice melting function, and can be used only when the overhead line is covered with ice, and the idle time is long. If the traction substation needs the two functions, two sets of equipment are required to be configured, the occupied area of the equipment is large, and the cost of purchasing the equipment is high.
Disclosure of Invention
The invention aims to provide a subway flywheel energy storage system and a subway flywheel energy storage method with direct-current ice melting functions, which have two functions of direct-current ice melting and flywheel energy storage charge and discharge, and the two functions are controlled by a switch to be time-sharing multiplexed, so that the high-efficiency utilization of equipment is realized, and the cost performance is improved.
A subway flywheel energy storage system with direct-current ice melting function comprises:
The subway rectifying module is used for outputting stable direct current through high-efficiency rectification and voltage regulation technology after the medium-voltage looped network alternating current is subjected to voltage reduction;
The flywheel energy storage module is used for converting regenerative braking electric energy through the converter cabinet to convert direct current into six-phase alternating current to drive the permanent magnet synchronous motor, and the permanent magnet synchronous motor drives the flywheel rotor to accelerate and store the energy in a mechanical energy form;
The subway rectifying module is connected with a positive bus and a negative bus, the positive bus is connected with the contact net, and the negative bus is connected with the running rail;
The flywheel energy storage module is also connected with a contact net through a breaker QF, and the contact net is connected with the running rail through a far-end short-circuit switch K3;
The flywheel energy storage module adopts two groups of three-phase active neutral point clamping type three-level topological structures, one of the three-phase active neutral point clamping type three-level topological structures is connected with an inductor in series, and the three-phase active neutral point clamping type three-level topological structures are connected with a capacitor in parallel to form a BUCK type DC/DC circuit, and six bridge arms in the converter cabinet form a six-path BUCK type DC/DC circuit.
Further, the flywheel energy storage module comprises a switch cabinet K1, an isolating switch cabinet K2, a converter cabinet, a contactor KM and a flywheel cabinet;
The converter cabinet is connected with the switch cabinet K1 and the negative bus through the isolating switch cabinet K2, and the switch cabinet K1 is also connected with the positive bus;
the converter cabinet is also connected with the flywheel cabinet through a contactor KM.
Further, the two groups of three-phase active neutral point clamped three-level topological structures comprise a group A and a group B, and the structures are the same;
the group A comprises three bridge arms, namely a bridge arm A, a bridge arm B and a bridge arm C, and also comprises an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5;
In the bridge arm A, a collector of a power switch tube Q3 is connected with a DC+ point, an emitter of the power switch tube Q3 is connected with a collector of a power switch tube Q4, an emitter of the power switch tube Q4 is connected with a collector of a power switch tube Q5 at a point a1, an emitter of the power switch tube Q5 is connected with a collector of a power switch tube Q6, an emitter of the power switch tube Q6 is connected with a DC-point, a midpoint of the power switch tube Q3 and the power switch tube Q4 is connected with a collector of a power switch tube Q1, an emitter of the power switch tube Q1 is connected with a point a2, the point a2 is connected with a bus capacitor C1 and a midpoint O of a bus capacitor C2, one end of a capacitor C1 is connected with the DC+ point, the other end of the capacitor C2 is connected with the DC-point, the other end of the capacitor C2 is connected with the neutral point O, and the other ends of the capacitor C6 are connected with the neutral point A, B and C are the same in structure, all power switch tubes are connected in reverse parallel, the emitters of the power switch tube Q1 are connected with the collector of the power switch tube, and the diode of each bridge arm is connected with the cathode of the power switch tube;
Connection point a1 in bridge arm a corresponds to B1 in bridge arm B and corresponds to C1 in bridge arm C;
One end of an inductor L1 is connected with a point a1 in the bridge arm A, the other end of the inductor L1 is connected with a capacitor C5 and a contactor KM, one end of an inductor L2 is connected with a point B1 in the bridge arm B, the other end of the inductor L2 is connected with a capacitor C4 and a contactor KM, one end of an inductor L3 is connected with a point C1 in the bridge arm C, and the other end of the inductor L3 is connected with a capacitor C3 and a contactor KM.
Further, the subway rectifying module comprises a step-down transformer, a rectifying unit and a plurality of switches;
One end of the step-down transformer is connected with the medium-voltage ring network, the other end of the step-down transformer is connected with one end of the rectifier unit, the other end of the rectifier unit is respectively connected with the positive bus and the negative bus, the positive bus is respectively connected with the contact network, and the negative bus is connected with the running rail.
The ice melting and energy storage method of the subway flywheel energy storage system with the direct-current ice melting function is characterized by comprising the following steps of:
When the contactor KM is closed and the breaker QF is opened, the system starts a flywheel energy storage charging and discharging mode, in the mode, when subway braking generates regenerative braking energy and the voltage of a direct current contact net is raised, regenerative braking electric energy which cannot be consumed by a neighboring vehicle is converted into current through a current transformer cabinet, direct current is converted into six-phase alternating current to drive a permanent magnet synchronous motor, the permanent magnet synchronous motor drives a flywheel rotor to accelerate, and the part of energy is stored in a mechanical energy form;
When the breaker QF is closed and the contactor KM is opened, the system starts a direct current ice melting mode, in the mode, direct current is output to the contact net, the contact net is in short circuit with the far end of the running rail through a switch K3, the switch is in a closed state in the direct current ice melting mode, a loop is formed between the contact net and the running rail by the output direct current, and the direct current flows through the contact net to generate Joule heat to achieve the effect of melting ice coating.
A set of circuit topology in the converter cabinet of the device realizes time-sharing multiplexing of two functions. Outputting six-phase alternating current to drive a permanent magnet synchronous motor in a DC/AC working mode of the flywheel energy storage charging and discharging mode converter cabinet, and enabling the permanent magnet synchronous motor to drive a flywheel rotor to accelerate so as to store electric energy in a mechanical energy form; under the AC/DC working mode of the flywheel energy storage charging and discharging mode converter cabinet, six-phase alternating current is converted into direct current and released to the contact net, so that the effects of energy conservation and voltage stabilization are achieved. And under the working mode of direct current ice melting DC/DC, the converter cabinet outputs direct current, and a current loop is formed between the converter cabinet and an upper contact net and a lower contact net or between the contact net and a running rail, so that heat is generated to melt the ice coating of the contact net.
According to the invention, the running rail and the contact net can be simultaneously melted in the direct-current deicing DC/DC mode, so that the adhesion coefficient of the running rail is increased, and the metro vehicle is prevented from skidding. The invention adopts two three-phase active neutral point clamping type three-level circuits to realize six-path direct current output in parallel through switching of a control mode.
Drawings
FIG. 1 is a first system topology diagram of the present invention;
FIG. 2 is an electrical topology of the flywheel energy storage module of the present invention;
fig. 3 is a circuit diagram of a phase in the direct current ice melting mode of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made in detail and with reference to the known art, but it should be apparent that the embodiments described are only some, but not all embodiments of the present invention.
As shown in figure 1, the subway flywheel energy storage system with the direct-current ice melting function comprises a medium-voltage ring network, a contact network, a running rail, a positive bus and a negative bus, and further comprises a subway rectifying module, wherein after the introduced alternating current of the urban power grid is reduced in voltage, stable direct current is output through a high-efficiency rectifying and voltage regulating technology, and the power supply requirement of high-power long-distance subway lines is met. The subway rectifying module comprises a step-down transformer, a rectifying unit and a plurality of switches, wherein one end of the step-down transformer is connected with a medium-voltage ring network, the other end of the step-down transformer is connected with one end of the rectifying unit, the other end of the rectifying unit is respectively connected with a positive bus and a negative bus, the positive bus is respectively connected with a contact net, and the negative bus is connected with a running rail.
As shown in fig. 1, the subway system introduces medium-voltage 35KV alternating current from the urban power grid, and after the medium-voltage 35KV alternating current is reduced by a step-down transformer of a traction substation, the medium-voltage 35KV alternating current is input into a rectifier unit, and stable 1500V direct current is output by a high-efficiency rectification and voltage regulation technology, so that the power supply requirement of a high-power long-distance subway line is met. The positive and positive buses of the rectifier unit output side power supply are connected, the on-off of the circuit is controlled through switches K8 and K9, the negative and negative buses of the rectifier unit output side power supply are connected, and the voltage level of the positive bus is DC 1500V. The positive and negative buses control the on-off of the subway contact net and the running rail through switches K4, K5, K6 and K7.
The flywheel energy storage module converts regenerative braking electric energy into six-phase alternating current through the converter cabinet to drive the permanent magnet synchronous motor, the permanent magnet synchronous motor drives the flywheel rotor to accelerate and stores the energy in a mechanical energy mode, and when the direct current network voltage drops due to subway traction, the flywheel rotor drives the permanent magnet synchronous motor to start decelerating, the stored mechanical energy is converted into electric energy, and the generated six-phase alternating current is converted into direct current through the converter cabinet to be released to the contact network.
The flywheel energy storage module comprises a switch cabinet K1, an isolating switch cabinet K2, a converter cabinet, a contactor KM and a flywheel cabinet, wherein the converter cabinet is connected with the switch cabinet K1 and a negative bus through the isolating switch cabinet K2, the switch cabinet K1 is also connected with a positive bus, and the converter cabinet is also connected with the flywheel cabinet through the contactor KM.
As shown in fig. 2, the flywheel energy storage module is formed by connecting two groups of three-phase active neutral point clamped three-level inverter circuits in parallel, namely a group a and a group B respectively, and outputs or inputs two groups of three-phase alternating currents. Three groups of bridge arms are shared by the three-phase active neutral point clamping type three-level inverter circuit, each bridge arm is provided with six power switching tubes, and the voltage stress of each switching tube is half of the total voltage of a direct current bus due to the clamping effect of two neutral point clamping switching tubes on the left side of each phase of bridge arm.
The group A comprises three bridge arms, namely a bridge arm A, a bridge arm B and a bridge arm C, and also comprises an inductor L1, an inductor L2, an inductor L3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5;
In the bridge arm A, a collector of a power switch tube Q3 is connected with a DC+ point, an emitter of the power switch tube Q3 is connected with a collector of a power switch tube Q4, an emitter of the power switch tube Q4 is connected with a collector of a power switch tube Q5 at a point a1, an emitter of the power switch tube Q5 is connected with a collector of a power switch tube Q6, an emitter of the power switch tube Q6 is connected with a DC-point, a midpoint of the power switch tube Q3 and the power switch tube Q4 is connected with a collector of a power switch tube Q1, an emitter of the power switch tube Q1 is connected with a point a2, the point a2 is connected with a bus capacitor C1 and a midpoint O of a bus capacitor C2, one end of a capacitor C1 is connected with the DC+ point, the other end of the capacitor C2 is connected with the DC-point, the other end of the capacitor C2 is connected with the neutral point O, and the other ends of the capacitor C6 are connected with the neutral point A, B and C are the same in structure, all power switch tubes are connected in reverse parallel, the emitters of the power switch tube Q1 are connected with the collector of the power switch tube, and the diode of each bridge arm is connected with the cathode of the power switch tube;
connection point a1 in arm a corresponds to B1 in arm B and C1 in arm C.
One end of an inductor L1 is connected with a point a1 in the bridge arm A, the other end of the inductor L1 is connected with a capacitor C5 and a contactor KM, one end of an inductor L2 is connected with a point B1 in the bridge arm B, the other end of the inductor L2 is connected with a capacitor C4 and a contactor KM, one end of an inductor L3 is connected with a point C1 in the bridge arm C, and the other end of the inductor L3 is connected with a capacitor C3 and a contactor KM.
As shown in fig. 2, the group B and the group a are identical in structure and will not be further described.
The flywheel energy storage module is installed in the traction substation. The input end of the converter cabinet is connected with the positive bus, the input end of the converter cabinet is connected with the negative bus and the running rail, the middle of the line is controlled by using the 1500V switch cabinet K1 to control the on-off of the line, and the isolation switch cabinet K2 is used for electric isolation. The converter cabinet is provided with two paths of outputs, one path of output six-phase alternating current is controlled to be connected with the permanent magnet synchronous motor in the flywheel cabinet through the contactor KM, the permanent magnet synchronous motor drives the flywheel rotor or the flywheel rotor drives the permanent magnet synchronous motor, the other path of output direct current is controlled to be connected with the contact net through the breaker QF, and the running rail and the contact net are controlled to be in remote short circuit through the switch K3. When KM is closed and QF is opened, the device starts a flywheel energy storage charging and discharging mode. In the mode, when the subway brakes to generate regenerative braking energy and raise the voltage of the direct current contact net, regenerative braking electric energy which cannot be absorbed by the adjacent vehicle is converted into current through the converter cabinet, direct current is converted into six-phase alternating current to drive the permanent magnet synchronous motor, the permanent magnet synchronous motor drives the flywheel rotor to accelerate, the flywheel rotor stores the energy in a mechanical energy mode, when the subway traction causes the direct current contact net voltage to fall, the flywheel rotor drives the permanent magnet synchronous motor to start decelerating, the stored mechanical energy is converted into electric energy, and the generated six-phase alternating current is converted into direct current through the converter cabinet and is released to the contact net, so that the effects of energy conservation and voltage stabilization are achieved. When QF is closed and KM is opened, the device starts a direct current ice melting mode. Under the mode, the direct current is output to the contact net, the contact net is in short circuit with the far end of the running rail through the switch K3, the switch is in a closed state under the direct current ice melting mode, a loop is formed between the contact net and the running rail by the output direct current, and the direct current flows through the contact net to generate Joule heat, so that the effect of melting ice coating is achieved.
Fig. 3 is a circuit diagram of one of the six phases of dc output of the present system in dc ice melting mode. The circuit is actually a phase in a three-phase Active Neutral Point Clamped (ANPC) three-level circuit, and is connected with an inductor in series and a capacitor in parallel to form a BUCK type DC/DC circuit. Six bridge arms in the converter cabinet form a six-path BUCK type DC/DC circuit, direct currents output in parallel are converged to the contact net, the contact net and a far-end short-circuit switch K3 of the running rail are closed, a current loop is formed, and the effect of melting ice coating of the contact net is achieved.
The invention realizes two functional modes by using one set of circuit topology of one set of system, not only can solve the utilization problem of subway regenerative braking energy and achieve the effects of energy conservation and voltage stabilization, but also can increase the utilization rate of equipment and improve the economical efficiency. The subway flywheel energy storage device with the direct-current ice melting function has the characteristics of convenience, rapidness and high efficiency. When the device is used as a flywheel energy storage device at ordinary times, a real-time power compensation function is realized, and when the overhead line is iced in an extreme environment, the device can also be used as a direct-current ice melting device to play a great role, so that the subway is prevented from losing electricity due to poor contact between the pantograph and the overhead line. The two modes are not required to be carried out simultaneously, so that two switches are required to be arranged on the output side to control the selection of the modes, and the switching is convenient, simple and efficient.
The active neutral point clamping type three-level circuit adopted in the converter cabinet has a plurality of advantages. Compared with a two-level circuit, the voltage stress of each switching tube is only half of the voltage of a direct current bus, and under the direct current bus with the same voltage level, the switching tube with smaller voltage withstand level can be selected, and the dv/dt in the switching process of each switching tube is greatly reduced, so that the electromagnetic interference of the system is improved. Compared with a Neutral Point Clamped (NPC) three-level circuit, the clamp diode is replaced by a switch tube, so that the problem of nonuniform heat distribution is solved.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN120638217A (en) * | 2025-08-13 | 2025-09-12 | 江苏同芯电气科技有限公司 | A subway energy feedback system with DC ice melting function and ice melting energy feedback method |
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| CN120638217A (en) * | 2025-08-13 | 2025-09-12 | 江苏同芯电气科技有限公司 | A subway energy feedback system with DC ice melting function and ice melting energy feedback method |
| CN120638217B (en) * | 2025-08-13 | 2025-11-07 | 江苏同芯电气科技有限公司 | A subway energy feeder system and method with DC de-icing function |
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| CN120638430B (en) | 2025-12-26 |
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Denomination of invention: A subway flywheel energy storage system with DC ice melting function and ice melting energy storage method Granted publication date: 20251226 Pledgee: Bank of China Limited Hefei Shushan Branch Pledgor: HEFEI ZHAOYANG ELECTRONIC TECHNOLOGY CO.,LTD. Registration number: Y2026980009317 |