一种抑制含光伏电源配电网电压越限的方法

doi:10.12204/j.issn.1000-7229.2020.11.009

摘要/Abstract

摘要：

光伏电源接入配电网后,会引起并网点附近的电压抬升,严重情况下导致电压越限。为了解决该问题,提出了在利用光伏逆变器的无功功率调压的同时,在配电线路中串联可调电抗器,以提高无功功率调压的能力和灵敏度。文中分析了电压抬升的原因以及光伏逆变器和串联电抗器在电压调整中的作用,得到电压降和串联电抗值与逆变器无功功率的关系;充分利用光伏逆变器无功能力,以有功线损最小为目标函数,找到最优的串联电抗器配置方案。最后,采用新疆某线路的实际算例,仿真分析了光伏逆变器无功能力的局限性,验证了该方法的有效性。

关键词: 光伏发电, 电压越限, 电压控制, 无功补偿, 电抗器

Abstract:

When photovoltaic power is connected to the distribution network, it will cause the voltage at the end of the line to rise and threshold crossing in severe cases. In order to solve this problem, to improve the ability and sensitivity of reactive power voltage regulation, it is proposed to add an adjustable reactor in series with distribution line as well as to use the reactive power of solar inverter for voltage regulation. The cause of the voltage rise and the effect of the photovoltaic inverter and the series reactor on voltage regulation are analyzed in this paper, and the relationship between voltage drop and series reactance and the reactive power of the photovoltaic inverter is obtained. Taking full advantage of the reactive power of the photovoltaic inverter, taking minimum active line loss as the objective function, the optimal allocation approach of series reactor is found. Finally, with the example of the line in Xinjiang Autonomous Region, the limitation of the reactive power of the photovoltaic inverter is analyzed, and the effectiveness of the method is verified.

Key words: photovoltaic power generation, voltage beyond limit, voltage regulation, reactive power compensation, reactor

中图分类号:

TM76

路怡, 江道灼, 梁一桥, 杨晓雷, 黄金波. 一种抑制含光伏电源配电网电压越限的方法[J]. 电力建设, 2020, 41(11): 87-93.

LU Yi, JIANG Daozhuo, LIANG Yiqiao, YANG Xiaolei, HUANG Jinbo. A Method for Suppressing Voltage Beyond Limits in Distribution Network with Photovoltaic Power Sources[J]. ELECTRIC POWER CONSTRUCTION, 2020, 41(11): 87-93.

图/表 8

图1 含光伏电源配电网的等值线路图

Fig.1 Equivalent circuit of the distribution network with PV power source

图2 串联可调电抗器模块的含光伏电源配电网

Fig.2 The distribution network with PV power source and series adjustable reactor

图3 寻找可调电抗器最优解的流程图

Fig.3 Flow chart for finding optimal solution of the adjustable reactor

图4 最大光伏出力时各节点电压曲线

Fig.4 Node voltage when maximum PV output

表1 不同光伏有功出力时逆变器的最大无功功率和实际无功功率

Table 1 The maximum and actual reactive power of PV inverter corresponding to different PV active output

图5 不同光伏有功出力时逆变器无功补偿后各节点电压曲线

Fig.5 Node voltage curve with reactive compensation from PV inverter when the PV outputs different active power

图6 串联电抗器最优配置时各节点电压曲线

Fig.6 Node voltage curve with optimal allocation of series reactor

表A1 新疆某线路算例具体数据

Table A1 Data of the line in Xinjiang Autonomous Region

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