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目前,供电半径较长且负荷较重的线路末端普遍存在电压偏低的情况,且电压频繁波动;尤其分布式电源通过线路末端接入后,其出力随机性和间歇性的特点使电压波动问题更为突出。传统的电压控制措施(如无功补偿、调节变压器分接头等)均无法满足电压调节的实时性与连续性要求。由于配电网线路中的等效电阻与电抗值基本相当,二者均会带来一定的电压降落,若采用固定电容实现串联补偿,仅能补偿电抗中的压降;若单纯采用基于电力电子的有源设备进行电压全补偿,所需设备容量较大,难以保证系统实现的经济性。提出了一种基于固定电容器与有源设备相结合的综合串联补偿技术,通过固定电容器自适应调节电抗中的压降,利用有源设备自动补偿电阻中的压降,在有效抑制有源配电网电压波动、提高供电质量的基础上,保证了系统实现的整体经济性。基于PSCAD仿真软件建立了含分布式电源的有源配电系统仿真模型,仿真结果证明了该方法的有效性。
At present, the low voltage is common at the end of the line with longer power supply radius and heavy load, and the voltage fluctuates frequently. Especially when the distributed power is connected through the end of the line, its output randomness and intermittence make the voltage fluctuation problem More prominent. The traditional voltage control measures (such as reactive power compensation, regulating transformer tap, etc.) are unable to meet the real-time voltage regulation and continuity requirements. As the distribution network line equivalent resistance and reactance values are basically the same, both of which will bring a certain voltage drop, if the use of fixed capacitors to achieve series compensation can only compensate for the voltage drop in the reactance; if purely based on power electronics Of the active equipment for voltage compensation, the required equipment capacity is large, it is difficult to ensure the economy of the system. An integrated series compensation technique based on the combination of fixed capacitor and active equipment is proposed. The voltage drop in the reactor is adaptively adjusted by the fixed capacitor, and the voltage drop in the resistor is automatically compensated by the active equipment. Network voltage fluctuations, improve power quality, based on the system to ensure the overall economy. Based on PSCAD simulation software, a simulation model of active power distribution system with distributed power is established. The simulation results show the effectiveness of the method.