Active/passive switching control method for MMC-HVDC island power grid
A MMC-HVDC, island power grid technology, applied in the direction of power transmission AC network, circuit devices, electrical components, etc., can solve the problems of unrecoverable stability, electrical quantity fluctuations, etc., and achieve the balance of active power in the whole network and high waveform quality , The effect of low switching frequency
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[0026] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0027] Such as figure 1 , provides a flow chart of an active / passive switching control method for an MMC-HVDC island power grid, and the specific implementation steps are as follows:
[0028] Step 1: First of all, it is necessary to ensure that the island power grid works in the active network state, which is the initial state by default, that is, the inner loop adopts fast current control, and the rectifier side in the outer loop control link adopts constant DC voltage control and constant reactive power control, and the inverter The side adopts constant active power control and constant AC voltage control, and uses a phase-locked loop to lock the grid phase;
[0029] Step 2: On the basis of step 1, determine whether the power generation system in the island power grid is in normal operation. If the power generation system is in normal operation, the island...
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