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

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

Active Publication Date: 2019-04-09
INST OF ELECTRICAL ENG CHINESE ACAD OF SCI +1
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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 photovoltaic power generation and power grid three-phase balance

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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] Such as 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 mana...

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Abstract

A control method for photovoltaic power generation and power grid three-phase balance is implemented by a measurement and control device and a power grid treatment device and comprises the steps of 1,judging a power flow direction of a power grid according to a power read by the measurement and control device, wherein power is supplied to a load from the power grid when the power is positive, andthe power is fed to the power grid by photovoltaic power generation when the power is negative; 2, performing average value calculation on the read three-phase power grid by the measurement and control device; 3, judging a phase circuit with maximum power supplied from the power grid to the load or maximum power fed to the power grid by photovoltaic power generation when the three-phase power isunbalanced; 4, calculating a power allocation coefficient of each power grid treatment device in the three-phase unbalanced line; 5, calculating a power allocation value of each power grid treatment device in the three-phase unbalanced line; and 6, controlling the corresponding power grid treatment devices to output or absorb the power by the measurement and control device according to the power allocation value of the power grid treatment device. By the control method, the purpose of three-phase power balance of the power grid is achieved.

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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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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