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Control system and method for suppressing power grid power oscillation based on photovoltaic power generation system

A photovoltaic power generation system and grid power technology, applied in the direction of photovoltaic power generation, reduction/prevention of power oscillation, reduction of flicker in the AC network, etc., can solve problems such as staying in the control strategy, and achieve the goal of improving frequency stability and suppressing grid power oscillation Effect

Pending Publication Date: 2020-08-11
NANJING INST OF TECH
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  • Claims
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AI Technical Summary

Problems solved by technology

[0003] At present, at home and abroad, based on photovoltaic power generation system to suppress power oscillation of the power grid, it is still in the research of control strategy, and few patents involve the exploration of physical mechanism.

Method used

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  • Control system and method for suppressing power grid power oscillation based on photovoltaic power generation system
  • Control system and method for suppressing power grid power oscillation based on photovoltaic power generation system
  • Control system and method for suppressing power grid power oscillation based on photovoltaic power generation system

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Embodiment Construction

[0028] The present invention will be specifically described below in conjunction with the accompanying drawings.

[0029] as attached figure 1 As shown, a control system based on a photovoltaic power generation system to suppress grid power oscillation is characterized in that: it includes a photovoltaic power generation system; the photovoltaic power generation system includes connected photovoltaic inverters and photovoltaic panels; the output of the photovoltaic power generation system The terminal is connected between two adjacent impedance elements in the power grid; the photovoltaic inverter judges whether the power grid is in a state of power oscillation according to the frequency change of the power grid, and performs PID adjustment on the frequency of the power grid in power oscillation through the photovoltaic power generation system, To achieve the purpose of suppressing the power oscillation of the power grid.

[0030] as attached figure 2 As shown, a control me...

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Abstract

The invention particularly relates to a control system and method for restraining power grid power oscillation based on a photovoltaic power generation system. The system comprises a photovoltaic power generation system, which comprises a photovoltaic inverter and a photovoltaic cell panel which are connected, wherein the output end of the photovoltaic power generation system is connected betweentwo adjacent impedance elements in a power grid, the photovoltaic inverter judges whether the power grid is in a power oscillation state according to the frequency change of the power grid, PID adjustment is conducted on the frequency of the power grid in power oscillation through the photovoltaic power generation system, and the purpose of restraining power grid power oscillation is achieved. Themethod comprises the steps that a photovoltaic inverter end is connected into a power grid, the initial value of useful power output by a photovoltaic power generation system is set to be P0, the initial value Q of reactive power output by the photovoltaic power generation system is set to be 0, and omega ref is set as the rated angular frequency of a synchronous generator, namely the angular frequency corresponding to the frequency 50Hz of the power grid. The system adjusts the active power of the synchronous generator of the power grid according to the power grid operation condition.

Description

technical field [0001] The method relates to the fields of new energy and power electronics, and specifically relates to a control system and method for suppressing grid power oscillation based on a photovoltaic power generation system. Background technique [0002] Power oscillation refers to the grid power fluctuation that occurs when the equivalent impedance of the transmission line is small or negative. Severe power oscillations will lead to disconnection of the power system, which directly threatens the safety of the power grid. The most commonly used method to suppress grid power oscillation is the power system stabilizer (Power System Stability, PSS), but with the development of society, the working conditions of the power system are becoming more and more complex, and its role in lower frequencies and ultra-low frequencies is Looks a little tired. In recent years, many scholars at home and abroad have begun to add Flexible AC Transmission System (FACTS) to the link...

Claims

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Application Information

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IPC IPC(8): H02J3/00H02J3/24H02J3/38H02J3/46H02J3/48
CPCH02J3/24H02J3/381H02J3/48H02J3/002H02J3/241H02J3/466H02J2300/24Y02E10/56
Inventor 王悦林健查雨欣张仪
Owner NANJING INST OF TECH
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