基于光伏逆变器无功调节的低压配电网多模式电压控制

发布时间：2018-05-23 10:40

本文选题：低压配电网 + 户用光伏发电　；参考：《电力系统自动化》2017年13期

【摘要】：针对大规模户用光伏接入引起的低压配电网电压越限问题,以逆变器无功控制为手段,提出了一种多模式逆变器控制策略,以提高低压配电网对光伏的消纳能力。基于电压灵敏度理论,定义了虚拟注入有功功率的概念,实现了节点有功和无功功率之间的折算。根据节点虚拟注入功率将光伏发电的并网分为过电压抑制、欠电压抑制以及网损和功率因数的优化三种模式。当网络出现过电压(欠电压)运行风险时,以风险的抑制为目标调节逆变器无功功率;当网络运行无风险时,则以网损和功率因数的优化作为逆变器的无功调节依据。此外,为了实现就地的协调控制,结合全网电压灵敏度矩阵建立了不同节点光伏逆变器控制参数的优化模型,实现网络无通信条件下的协调电压控制。仿真结果表明,所提的多模式电压控制方法可以有效地抑制网络电压越限,同时使网络损耗和功率因数也得到优化。
[Abstract]:Aiming at the problem of voltage overrunning caused by large scale household photovoltaic access, a multi-mode inverter control strategy is proposed to improve the absorption capacity of low-voltage distribution network to photovoltaic by using reactive power control of inverter as a means. Based on the theory of voltage sensitivity, the concept of virtual injected active power is defined, and the conversion between active and reactive power is realized. According to the node virtual injection power, photovoltaic generation is divided into three modes: overvoltage suppression, undervoltage suppression, and optimization of network loss and power factor. When there is overvoltage (undervoltage) running risk, the reactive power of inverter is adjusted with the aim of reducing the risk, and the optimization of network loss and power factor is taken as the basis of reactive power regulation when the network is running without risk. In addition, in order to realize the local coordinated control, the optimal model of control parameters of photovoltaic inverter with different nodes is established in combination with the whole grid voltage sensitivity matrix, which realizes the coordinated voltage control under the condition of no communication in the network. The simulation results show that the proposed multi-mode voltage control method can effectively suppress the network voltage overrun and optimize the network loss and power factor.
【作者单位】：中国农业大学信息与电气工程学院;
【基金】：国家自然科学基金资助项目(51377162) 中央高校基本科研业务费专项资金资助项目(2016XD001)~~
【分类号】：TM464;TM714.2

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