考虑逆变器无功充裕性的含高比例户用光伏低压配电网电压控制策略

发布时间：2019-01-07 10:46

【摘要】：当前大规模户用光伏接入低压配电网逐渐成为趋势,然而高比例户用光伏并网将引起严重的潮流逆向,导致电压越限和网损增加。首先,结合低压配电网的线路参数和拓扑结构,对低压配电网中电压-有功和电压-无功的量化关系进行了分析;在此基础上,考虑光伏逆变器的容量特性和节点电压偏移限制,提出了含高比例户用光伏的低压配电网无功裕度评估方法;为尽可能降低光伏并网有功的削减,以网络无功充裕性为依据设计了就地的有功无功综合控制策略;为了兼顾控制的效果和经济性,结合低压配电网的拓扑特点,进一步提出了不同节点间的控制参数优化整定方法。仿真结果表明,所提控制方案能够高效利用逆变器无功进行电压控制、降低光伏并网有功削减,同时实现网损的优化。
[Abstract]:At present, it is becoming a trend for large-scale household photovoltaic to connect to low-voltage distribution network. However, a high proportion of household photovoltaic will cause serious reverse of power flow, resulting in voltage overrun and network loss increase. Firstly, the quantitative relationship between voltage-active power and voltage-reactive power in low-voltage distribution network is analyzed in combination with the line parameters and topology of low-voltage distribution network. On this basis, considering the capacity characteristics of photovoltaic inverter and the limitation of node voltage offset, the reactive power margin evaluation method of low-voltage distribution network with high proportion of household photovoltaic is proposed. In order to reduce the reduction of active power in photovoltaic grid as far as possible, a comprehensive active and reactive power control strategy is designed based on the adequacy of network reactive power. In order to give consideration to the effect and economy of the control, combined with the topological characteristics of the low-voltage distribution network, the optimal tuning method of control parameters between different nodes is proposed. The simulation results show that the proposed control scheme can efficiently utilize the reactive power of the inverter to control the voltage, reduce the active power reduction of the photovoltaic grid, and realize the optimization of the network loss at the same time.
【作者单位】：中国农业大学信息与电气工程学院;中国电力科学研究院;
【基金】：国家电网公司科技项目“提高光伏扶贫地区电网消纳能力与保障技术的研究与应用”~~
【分类号】：TM714.2

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