JPS6355296B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a parallel operation device for generators in a power supply system that has a plurality of generators and whose busbars can be separated into two or more systems. For example, in a power supply system that has multiple generators in the same plant and needs to be separated into multiple buses or unified depending on the plant operation, voltage and frequency often fluctuate when the system is switched. The present invention is designed to control the power flow between the busbars in order to suppress such fluctuations.

A conventional device of this type is shown in FIG. In the figure, 1 is the 1st busbar, 2 is the 2nd busbar, 3 is the connecting busbar that connects the 1st busbar 1 and the 2nd busbar 2, 4 is the connecting busbar switch that connects the connecting busbars,
G ₁ , G ₂ , G ₃ and G ₄ are multiple generators, 5 is multiple generators G ₁ to _{G 4} and synchronization between the busbars,
a generator control device that controls load sharing, 12 a generator switch that connects the generator G ₁ and the No. 1 bus 1;
13 is an automatic voltage regulator that controls the terminal voltage of generator G ₁ , 14 is a generator field of generator G ₁ controlled by automatic voltage regulator 13, and 15 is generator active power detection of generator G ₁ . 16 is a reactive power detection device for the generator _G1 , and 17 is a generator prime mover governor motor for the generator _G1 . The generator prime mover is provided with a governor to keep the output frequency of the generator constant, and the generator prime mover governor motor 17
The mechanism that sets the reference speed of this governor is remotely controlled. 18 is a governor motor switch that rotates the generator prime mover governor motor 17 in forward or reverse rotation. 21 is load group, 22 is load group 2
1, and numerals 21 and 22 collectively indicate the individual loads and switches, respectively. Generators designated by numbers 13 to 18
The regulating system and the detection system for G ₁ are connected to the terminal tG ₁ of the generator control device 5.

Although not shown for simplicity, the reference numeral 1
Adjustment systems and detection systems such as those shown in 3 to 18 are also provided in connection with each of the other generators G ₂ to G ₄ , and they are used for generator control as in the case of generator G ₁ . They are connected to corresponding terminals tG ₂ to _{tG 4} of device 5, respectively.

Next, the operation will be explained. Generator control device 5
The first feature is automatic synchronization input. Depending on the selection operation, between the generator and the bus, or between the No. 1 bus and the No. 2 bus
Performs synchronization control between bus lines. That is, the automatic voltage regulator 13 is controlled to match the voltage magnitude, and the governor motor switch 18 is controlled to match the frequency and phase.
control. As described above, the generator control device 5 issues a closing command to the generator switch 12 or the communication bus switch 4 in a state where the voltage, frequency, and phase are substantially matched.

Next, the generator control device 5 has a load sharing control function, and the active power of each generator is monitored by the generator active power detection device 15, so that the power sharing ratio of each generator becomes a certain predetermined ratio. The control switch, that is, the governor motor switch 18 is controlled as follows.
The frequency is constantly monitored and controlled to remain constant.
In addition, the reactive power of each generator is monitored by the generator reactive power detector 16, and the automatic voltage regulator 13 is controlled so that the reactive power share of each generator becomes a predetermined ratio.

Next, when the generator is disconnected from the bus, the load of the generator to be disconnected is gradually shifted to another generator, and then the generator switch 12 is opened.

The conventional parallel operation device for generators is configured as described above, so depending on how the busbar is operated,
For example, when opening the connecting bus switch 4 for independent operation from a state in which bus No. 1 and bus No. 2 are connected, there is a drawback that large load fluctuations occur, causing fluctuations in the voltage and frequency of each bus. It was hot.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and in order to monitor the transfer of active power and reactive power between buses, the magnitude and direction of active power and reactive power are transmitted to the connecting bus circuit. It is an object of the present invention to provide a parallel operation device for a generator, which is equipped with a detection device and can be controlled so that the active power and reactive power of the communication bus circuit are minimized when the communication bus switch 4 is opened.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 2, numeral 31 is an active power detector of the connecting bus circuit, and 32 is a connecting bus reactive power detector, both of which can detect the magnitude and direction (polarity). The other configurations are the same as those in FIG. 1, so explanations will be omitted.

Next, the operation will be explained. When the generators between different buses are running in parallel, the generator control device 5
controls the sharing of active power and reactive power of each generator in the same way as explained in FIG. Therefore, no special control is performed regarding the transfer of power between different bus lines.

Next, when shifting to independent operation for each of the different buses, the generator control device 5 detects the active power and reactive power between the different buses according to the signals from the connecting bus active power detector 31 and the connecting bus reactive power detector 32. The governor motor switch 18 and automatic voltage regulator 13 of each generator are controlled so that the transfer (current) of power is minimized. The communication busbar switch 4 is opened when this power flow has decreased to within a predetermined value.

As described above, according to the present invention, since the active power and reactive power of the communication bus circuit can be monitored and controlled,
When disconnecting different busbars for independent operation, the effect is that the load fluctuation on the grid is small and the voltage and frequency fluctuations of each busbar are small.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a conventional parallel operation device for generators, and FIG. 2 is a system diagram showing a parallel operation device for generators according to an embodiment of the present invention. In the figure, 1 is the first busbar, 2 is the second busbar, 3 is the connecting busbar, 4 is the connecting bus switch, 5 is the generator control device,
G ₁ , G ₂ , G ₃ and G ₄ are generators, 12 is a generator switch, 13 is an automatic voltage regulator, 14 is a generator field, 15 is a generator active power detector, 16 is a generator disabled A power detector, 17 is a generator prime mover governor motor, 18 is a governor motor switch, 21 is a load group, 22 is a load switch, 31 is a connecting bus active power detector, and 32 is a connecting bus reactive power detector.
In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A first generator prime mover governor motor that adjusts the active power of the first generator connected to the No. 1 bus, and a first automatic voltage that adjusts the reactive power of the first generator. a regulator, a second generator prime mover governor motor that adjusts the active power of the second generator connected to the No. 2 busbar, a second automatic voltage regulator that adjusts the reactive power of the second generator; A connecting bus active power detector that detects the magnitude and direction of the active power of the connecting bus that connects the No. 1 bus and the above-mentioned No. 2 bus through the connecting bus switch, and detecting the magnitude and direction of the reactive power of the connecting bus. and a connecting bus reactive power detector to detect the first generator based on the magnitude and direction of the active power and reactive power of the connecting bus when disconnecting the line between the No. 1 bus and the No. 2 bus. The prime mover governor motor, the first automatic voltage regulator, the second generator prime mover governor motor, and the second automatic voltage regulator are controlled so that the magnitudes of active power and reactive power of the communication bus are minimized. A parallel operation device for a generator, comprising a generator control device that opens the communication busbar switch.