Reactive Power Analysis on Emergency DC Power Support Considering Excitation Control of Generators Near Inverter Station

摘要

Emergency DC Power Support can improve the stability of the system voltage after single-circuit DC bipolar blocking. Insufficient reactive power of the inverter station will often cause the drop of bus voltage and DC power to be unable to increase to the specified value, which will reduce the effect of emergency DC power support. Improving excitation voltage of generators that are near the inverter station can provide additional reactive power. Therefore, in case of insufficient reactive power, the ratio between the active power transmission and the reactive power consumption of the DC system is analyzed firstly. Then the emergency excitation control of the generator which can increase bus voltage of inverter station during emergency DC power support is revealed. And further, simulation results show that this strategy can compensate the lack of reactive power of the inverter station caused by the increase of DC transmission power during emergency DC power support. Generator with emergency excitation voltage control effectively provide emergency reactive power support and improve the stability of the power system.