Power grid voltage regulation method of angle form cascade synchronous compensator
A cascading synchronization and grid voltage technology, applied in the direction of AC network voltage adjustment, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve the problem that reactive power compensation devices cannot meet the application requirements, affect the efficiency of new energy generation, Problems such as large voltage deviation
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[0031] see figure 1 , is the topological structure diagram of an angular cascaded synchronous compensator (STATCOM) cascaded with n H-bridge modules for each phase, where V a , V b , V c is the voltage of the common connection point of the three-phase grid, L s is the grid equivalent reactance, i a i b i c is the angular cascaded STATCOM line current, L is the angular cascaded STATCOM filter reactance, i ab ibc i ca is the angular cascade STATCOM phase current, U dc1 , U dc2 ... U dcn is the DC side voltage of each sub-module. When the power grid voltage is unbalanced, flickering or contains more harmonic components, there may be errors in the frequency and phase information extracted by the traditional phase-locked loop. Therefore, the voltage detection based on the generalized second-order integrator is used to quickly and accurately Extract phase and frequency information, so that the system can still ensure accurate grid synchronization under asymmetrical faults...
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