Photovoltaic power-based compensation method for unbalanced load current and reactive power in power grid

电网中利用光伏电源补偿负荷不平衡电流及无功的方法

Abstract

本发明提供电网中利用光伏电源补偿负荷不平衡电流及无功的方法,所述电网包括电网电源、光伏电源以及负载,所述光伏电源包括光伏阵列,所述光伏阵列产生的直流电通过可关断元件将直流电逆变成交流电输送给电网电源,其中,所述电网还包括用于补偿负荷不平衡电流及无功的控制器,所述控制器根据光伏阵列的电压电流、负载的电流电压以及可关断元件逆变后的电流,调整可关断元件的控制角。通过控制光伏电源,实现对负载电流不平衡及无功进行补偿,补偿后,负载至电网的线路中电流不平衡得到改善,实现基本平衡;同时,无功得到补偿,功率因数得到改善,减少线路中电能损耗。
The invention provides a photovoltaic power-based compensation method for unbalanced load current and reactive power in a power grid. The power grid comprises a grid power supply, a photovoltaic power supply, a load and a controller. The photovoltaic power supply comprises a photovoltaic array. Direct current, generated by the photovoltaic array, is inverted into alternating current through a turn-off element and then transmitted to the grid power supply. The controller is used for compensating the unbalanced load current and the reactive power. According to voltage and current of the photovoltaic array, voltage and current of the load and the current inverted by the turn-off element, the controller adjusts a control angle of the turn-off element. According to the arrangement, the photovoltaic power supply is controlled, the unbalanced load current and the reactive power are compensated, then unbalanced current, loaded into the circuit of the power grid, is improved to achieve the basic balance; and meanwhile, the reactive power is compensated, with power factors increased, and electric energy loss in the circuit is reduced.

Claims

Description

Topics

Download Full PDF Version (Non-Commercial Use)

Patent Citations (2)

    Publication numberPublication dateAssigneeTitle
    CN-101847875-ASeptember 29, 2010浙江大学电压型并网逆变器的不对称直接功率控制的功率补偿方法
    WO-2013013656-A2January 31, 2013ct.e Controltechnology Engineering GmbHVerfahren zur adaptiven regelung der versorgungsspannung in ortsnetzen

NO-Patent Citations (1)

    Title
    王海祥等: "光伏并网线路的三相不平衡及无功补偿研究", 《电源技术》, vol. 36, no. 12, 31 December 2012 (2012-12-31)

Cited By (0)

    Publication numberPublication dateAssigneeTitle