Method for quickly and effectively inhibiting frequency fluctuation of island power grid
A power grid frequency and sea island technology, applied in the field of power transmission and distribution, can solve the problems of reducing frequency changes, slow response speed of governors, and inability to adjust system frequency in time, so as to maintain frequency stability, suppress frequency fluctuations, and maintain active power balanced effect
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[0021] The VSC-HVDC system structure is as follows figure 1 As shown, Uc is the fundamental wave component of the converter output voltage; Us is the fundamental wave component of the AC bus voltage; δ is and The phase angle difference between them; the converter adopts PWM control, and m is the modulation degree. By adjusting δ and m, the active power and reactive power of VSC-HVDC can be quickly controlled.
[0022] In the present invention, the VSC-HVDC system supplies power to the island load, such as figure 2 As shown, the island equivalent generator capacity is 120MW. The VSC-HVDC system adopts constant DC voltage on the rectifier side, constant active power on the inverter side and AC bus voltage control mode, and a constant active power control schematic diagram with a frequency correction module on the inverter side. Such as image 3 shown. When the island power grid is affected by the impact load, the two control modes of VSC-HVDC without frequency correction...
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