DOU Xiaobo,HUANGFU Xiaowen,QUAN Xiangjun,et al.Adaptive Voltage Control Strategy for Soft Normally Open Point in AC/DC Distribution Network[J].Automation of Electric Power Systems,2021,45(8):68-76.
DOU Xiaobo,HUANGFU Xiaowen,QUAN Xiangjun,et al.Adaptive Voltage Control Strategy for Soft Normally Open Point in AC/DC Distribution Network[J].Automation of Electric Power Systems,2021,45(8):68-76. DOI: 10.7500/AEPS20191124007.
Adaptive Voltage Control Strategy for Soft Normally Open Point in AC/DC Distribution Network
the DC distribution network needs to provide power support due to the weak voltage regulation capability of AC weak distribution network at receving end. The DC distribution network is both affected by itself and the AC distribution network, resulting in large deviation of DC voltage and low inertia characteristics more obvious. In light of this
a DC adaptive voltage control strategy considering soft normally open points (SNOPs) is proposed in this paper. Firstly
the influence principle of voltage disturbance in the AC power grid on the dynamic response and inertia regulation process of DC voltage is analyzed
and the disturbance can be effectively suppressed by designing the voltage feedforward control method. Then
aiming at the problem of insufficient regulation capacity of weak AC distribution networks
an adaptive power compensation control method is introduced
which makes SNOP adaptively compensate power shortage according to the voltage variation at the operation point. Meanwhile
the influence of the power demand on the DC voltage deviation is analyzed. On this basis
for the DC system
an improved adaptive virtual inertia control method is devised by comprehensively considering the DC voltage deviation and the voltage change rate
and the influence of main control parameters on the DC system stability is also discussed
which improves the inertia of the DC system. Finally
a simulation model of AC/DC hybrid distribution network is built in MATLAB/Simulink
and the validity of the control strategy is verified.
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references
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