DC Electric Spring for Voltage Fluctuation Suppressing of DC Distribution Network
Zeng Zheng1 ,Shao Weihua1 ,Ran Li1 ,Sun Wentao2, Ma Li3
1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China; 2.State Grid Jiangsu Economic Research Institute Nanjing 210008 China; 3.China Electric Power Research Institute Beijing 100192 China
Abstract DC distribution network can effectively integrate renewable energy sources (RESs) into the utility and dispatch power to DC loads.As a result,it has been paid common attentions.To suppress the voltage fluctuation at buses caused by RESs,a DC electric spring (ES) concept is presented for DC distribution network applications.By using a PWM Buck/Boost converter,the proposed ES can regulate the voltage of controllable load at its terminal bus.The power consumption of the controllable load can track and compensate the intermittent power generation of RESs.Because the intermittent power can be balanced by the local load and cannot flow in the network,the voltage fluctuation at buses can be naturally suppressed.In this paper,aiming to a typical DC distribution network,the physical model and the circuit model of the ES are built.Then a detailed mathematical model is proposed to analyze the factors influencing the voltage fluctuation.Schematic topology,control scheme,parameter design,and controllable boundary of the ES are then proposed to suppress the voltage fluctuation.Validation and effectiveness of the proposed models and approaches are confirmed by the simulated results of PSCAD/EMTDC.
Zeng Zheng,Shao Weihua,Ran Li等. DC Electric Spring for Voltage Fluctuation Suppressing of DC Distribution Network[J]. Transactions of China Electrotechnical Society, 2016, 31(17): 23-31.
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2016, Vol. 31 
