Abstract
大规模新能源的开发与利用形成了许多区域性的能源基地，能源基地之间可由多种方式汇集到汇流站进行并网，然后通过电流源型直流输电(LCC)外送通道送电到受端电网。本文论述了由电压源换流器高压直流(Voltage Source Converter HVDC, VSC-HVDC)系统与LCC-HVDC系统组成的用于提高新能源消纳的混合多馈入直流(hybridmulti-infeed HVDC，HMIDC)并网的可行性，构建了该并网方式和传统交流并网方式的拓扑结构，通过DigSILENT软件，搭建了仿真模型，基于风电场故障扰动法对混合多馈入和传统多馈入暂态特性进行了分析。由仿真结果得到以下结论：风电场发生三相短路故障时，混合并网较传统交流并网，电压电流受到较小影响，恢复速率快，功率波动小，提高了暂态电能质量。 Large-scale development and utilization of new energy form a number of regional energy base; the energy base can be collected by a variety of ways to the convergence station and network, and then through LCC transmission channel to the Power grid. This paper discusses the feasibility to improve the consumption of new energy by the hybrid multi-infeed HVDC (HMIDC), which is composed of Voltage Source Converter HVDC (VSC-HVDC) system and LCC-HVDC system. The topology of the H-MIDC and the traditional AC grid-connection is constructed. Then, based on the wind farm fault disturbance method, the special analysis simulation model of the Hybrid MIDC and traditional AC grid-connection is built by DigSILENT software. The simulation results show that when the three-phase short-circuit fault of the wind farm occur, the H-MIDC is better than Ac Grid-connec- tion, the voltage and current are affected less, the recovery rate is fast, the power fluctuation is small, and the transient power quality is improved.
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