新能源接入的直流电网功率平滑控制策略  

Power Smoothing Control Strategy for Renewable-energy-based DC Grid

作　　者：万庆祝[1] 李俊涛 迟忠君[2] WAN Qingzhu;LI Juntao;CHI Zhongjun(School of Electric and Control Engineering,North China University of Technology,Beijing 100144,China;State Grid Beijing Electric Power Company,Beijing 100075,China)

机构地区：[1]北方工业大学电气与控制工程学院,北京100144 [2]国网北京市电力公司,北京100075

出　　处：《高电压技术》2019年第1期276-283,共8页High Voltage Engineering

基　　金：北京市电力节能关键技术协同创新(2011)(PXM2016_014212_000016);北京市教委面上项目(SQKM201411417006)~~

摘　　要：直流电网技术是解决新能源并网和消纳问题的有效技术手段之一。为平抑新能源功率波动、负荷突变引起的直流网侧电压波动,设计了以平抑直流并网点功率波动为目标的功率平滑控制策略。构建了含风力发电、光伏发电、储能单元、交流负荷和直流负荷的六端口直流电网拓扑,搭建了基于MATLAB/Simulink仿真平台的六端口直流电网仿真模型,对新能源功率波动、负荷突变及直流线路单极对地短路故障等工况进行了仿真分析,依托于直流电网实验系统开展了实验验证。仿真与实验结果表明,该控制策略可有效减小并网点功率波动,能够较快抑制功率波动引起的直流网侧电压波动,实现了系统的灵活、可靠运行。DC grid technology is one of the effective ways to solve large-scale renewable energies integration and accommodation problems. Consequently, in order to suspend the fluctuation of DC grid side voltage caused by power fluctuation in renewable energies and sudden change of load, a novel control strategy which aims at stabilizing the power fluctuation at the point of common coupling(PCC) of DC side is proposed. A six-terminal DC grid topology, which includes wind power generation, solar power generation, energy storage unit, AC load, and DC load, is constructed. The equivalent simulation model of DC grid is built based on the MATLAB/Simulink platform. Moreover,simulations and analyses on renewable energy fluctuation, load mutation and monopolar grounding fault are carried out, and experimental verification is undertaken using the DC grid experimental system. Simulation and experimental results validate that the proposed method is capable of reducing the power fluctuation at PCC of DC side, restraining the pulsation of DC side voltage caused by power fluctuation quickly and effectively. The flexible and reliable operation of the system is realized.

关 键 词：新能源接入 直流电网 功率波动 储能单元 平滑控制 

分 类 号：TM73[电气工程—电力系统及自动化]