A Method of Combined Load Shedding of Low Frequency and Low Voltage
A low-frequency load shedding, low-frequency and low-voltage technology, applied in the direction of AC network voltage adjustment, power network operating system integration, information technology support system, etc., can solve the problem that it is difficult to effectively ensure the frequency stability and voltage stability of the power system, and cannot adapt to system operation Problems such as working conditions and disturbance forms, failure to fully consider frequency and voltage coupling effects, load frequency and voltage characteristics, etc.
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[0032] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.
[0033] Such as figure 1 As shown, in the IEEE 39-bus system, considering the generator voltage regulator and speed governor, the load adopts a power function model and set α=1 and β=1.5 in formula (1). The low-frequency load shedding threshold value f in the scheme of the present invention Kf 49Hz, 48.8Hz, 48.4Hz, 48.2Hz, 48Hz, corresponding to load shedding ΔP Kf Both are set to 7% of the total active power of the node load. The simulation is carried out on PSASP, a comprehensive program for power system analysis. The perturbation form is 0.5 seconds, and the IEEE39-node system figure 1 As shown in the X position, there is a sharp drop in frequency and voltage because the active power shortage of the left isolated grid is serious and the receiving end load is far away from the generator.
[0034] Under this disturbance, the calculation steps for the...
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