Method for realizing emergency control on frequency and voltage of electric system
An emergency control and power system technology, applied in the direction of power network operating system integration, information technology support system, AC network voltage adjustment, etc., can solve the problems of frequency and voltage emergency control devices refusing to operate, inability to distinguish power grids, and large absolute values. Achieved the effect of solving the problem of refusal of the frequency and voltage emergency control device
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[0028] The geographic wiring of the power grid in region A is as follows: figure 1 shown. The power grid in this area is connected with the provincial grid through the 500kV double-circuit line from BUS_3 to BUS_4.
[0029] When the BUS_3-BUS_4 double-circuit line of the regional and provincial network was disconnected for some reason, the isolated network in this area operated and there was a large power shortage. If part of the load cannot be shed quickly, the voltage will collapse rapidly.
[0030] During the start-up phase of the low-voltage load-shedding device (the voltage setting is usually 0.9p.u.), the change of the bus voltage per 100ms exceeds 0.1 p.u., which will cause the traditional low-voltage load-shedding device to refuse to operate due to blocking, and the voltage will be lower than 0.7 for a long time. per unit value, the device cannot be unlocked, eventually causing the grid voltage to collapse.
[0031] When the region is in a state of voltage emergency...
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