Transient Voltage Stability Control Method for Flexible DC Distribution Network
Due to the complexity of factors causing transient voltage fluctuations in flexible DC distribution net-works,it is difficult to achieve rapid convergence of voltage fluctuations when controlling them.Therefore,a tran-sient voltage stability control method for flexible DC distribution networks is proposed.Based on the characteris-tics of voltage source converter,DC bus,distributed power supply and load,a flexible DC distribution network model is constructed,and the alternator-bus track sensitivity is introduced to reflect the influence of generator out-put variation on bus voltage fluctuation.In the specific control stage,the trigger angle and on-angle of the con-verter are adjusted according to the alternator-bus track sensitivity corresponding to different lines,and the shunt capacitor bank is used to compensate the reactive power of the flexible DC distribution network to realize the tran-sient voltage stability control.In the test results,the control method presented can realize the rapid convergence of the overall output voltage fluctuation of the distribution network,and ensure that the voltage is maintained in a stable state in a short period of time,regardless of the stable working state of the power network or the state of voltage abrupt transient events,indicating that it can effectively guarantee the stable operation of the distribution network.
flexible DC distribution networktransient voltagestability controlreactive power compensation
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