A Method for Suppressing Voltage Beyond Limits in Distribution Network with Photovoltaic Power Sources

doi:10.12204/j.issn.1000-7229.2020.11.009

Abstract

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

CLC Number:

TM76

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.

Figures/Tables 8

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

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

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

Fig.4 Node voltage when maximum PV output

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

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

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

Table A1 Data of the line in Xinjiang Autonomous Region

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