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Control method for three-phase balance between photovoltaic power generation and power grid

A photovoltaic power generation and control method technology, applied in photovoltaic power generation, single-network parallel feeding arrangement, electrical components, etc., can solve problems such as three-phase imbalance in the power grid

Active Publication Date: 2022-04-19
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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  • Description
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Problems solved by technology

[0006] The purpose of this invention is to overcome the problem of three-phase unbalance of the power grid caused by the access of photovoltaic power generation at the end of the power grid, and propose a method for three-phase balance between photovoltaic power generation and power grid

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  • Control method for three-phase balance between photovoltaic power generation and power grid

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Embodiment Construction

[0060] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. The balance method of the present invention is specifically as follows:

[0061] like figure 1 As shown, the photovoltaic power generation and power grid management system applying the present invention is composed of a measurement and control device, m photovoltaic power generation units and n power grid management devices, m and n are integers, m≥1, n≥1.

[0062] The measurement and control device is located at the output end of the low-voltage side of the transformer of the distribution network. The measurement and control device receives the remote management and scheduling data upwards, and reads the data of all power grid management devices and photovoltaic power generation unit equipment on the three-phase lines in the station area through network communication. And control n power grid management devices.

[0063] The power grid managem...

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Abstract

A control method for three-phase balance between photovoltaic power generation and power grid, which is realized by a measurement and control device and a power grid management device. The steps are as follows: the first step is to judge the power flow direction of the power grid through the power read by the measurement and control device, and when the power is positive, the power grid supplies power to the load , when the power is negative, the photovoltaic power generation feeds power to the grid; the second step, the measurement and control device calculates the average value of the read three-phase grid power; the third step, when the three-phase power is unbalanced, judge the power supplied by the grid to the load The largest or the one-phase line with the largest feed power of photovoltaic power generation to the grid; the fourth step, calculate the power distribution coefficient of each grid control device in the three-phase unbalanced phase line; the fifth step, calculate the power distribution coefficient of each power grid control device in the three-phase unbalanced phase The power distribution value of the power grid management device; the sixth step, the measurement and control device controls the output or absorption power of the corresponding power grid management device according to the power distribution value of the power grid management device, so as to achieve the purpose of three-phase balance of power grid power.

Description

technical field [0001] The invention relates to a three-phase balance control method for photovoltaic power generation and power grid. Background technique [0002] With the rapid development of photovoltaics and the launch of the national targeted poverty alleviation policy, distributed photovoltaic power generation has grown explosively in the form of regions. Due to the weak power supply capacity of the rural distribution network and the large line impedance, the single-phase load is basically the main load, and the distribution of power load is uneven. Especially when there is only grid power supply, there is a serious three-phase unbalanced state during the peak period of power consumption, causing a single-phase voltage to be too low and harmonics to increase. As a result, distributed photovoltaic power generation in the region will face the problems of high density, uneven distribution of multi-point access photovoltaic installations, and complex power flows, which w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/26
CPCH02J3/383H02J3/26Y02E10/56Y02E40/50
Inventor 王一波王哲徐斌丁津津张颖杨子龙高娴
Owner INST OF ELECTRICAL ENG CHINESE ACAD OF SCI
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