Reactive voltage control method of photovoltaic power station

A voltage control method and technology for photovoltaic power plants, applied in photovoltaic power generation, reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as voltage oscillation and lack of coordination, maintain voltage stability, and suppress bus voltage fluctuations Effect

Active Publication Date: 2013-01-09
NARI NANJING CONTROL SYST
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  • Claims
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AI Technical Summary

Problems solved by technology

However, in photovoltaic power plants built in multiple phases, multiple SVCs and SVGs often coexist. Due to the lack of coordination of multiple reactive power compensation devices, voltage oscillations are prone to occur during adjustment.

Method used

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  • Reactive voltage control method of photovoltaic power station
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  • Reactive voltage control method of photovoltaic power station

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Embodiment approach

[0038] In order to further reveal the technical solution of the present invention, the implementation of the present invention will be described in detail below in conjunction with the accompanying drawings: In the present invention, the grid-connected point voltage of the photovoltaic power station is used as the control target, and the reactive power is used as the adjustment amount. Through the coordinated control of photovoltaic inverters and reactive power compensation devices, the voltage of the grid-connected point can meet the grid voltage requirements.

[0039] Such as figure 1 Shown is the flow chart of the reactive voltage control method of the photovoltaic power station of the present invention. This method comprises the following steps:

[0040] 1) Measure the real-time voltage value U of the grid-connected point of the photovoltaic power station mea , calculate the voltage real-time value U mea and grid-connected point voltage target value U target The absolu...

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Abstract

The invention discloses a reactive voltage control method of a photovoltaic power station, which uses a photovoltatic power station synchronization point as a control target and reactive power as a regulating quantity. According to the reactive demand of the photovoltaic power station, a reactive power supply of the photovoltaic power station is integrally planed, the reactive output of each photovoltaic inverter and reactive compensating device in the photovoltaic power station is determined, and coordination control of the photovoltaic inverters and the reactive compensating devices in the photovoltaic power station is realized; and protection restraint conditions of the photovoltaic inverters and the reactive compensating devices are fully considered, and the photovoltaic inverters and the reactive compensating devices, which do not meet the restraint conditions, do not participate in the reactive voltage control. The control method provided by the invention can ensure that the reactive output of the photovoltaic power station synchronization point meets the system load change and inhibits the bus voltage fluctuation caused by load change, and has the function of maintaining the voltage of the photovoltaic power station synchronization point to be stable.

Description

technical field [0001] The invention relates to a reactive voltage control method of a photovoltaic power station, which belongs to the technical field of photovoltaic power generation. Background technique [0002] In recent years, photovoltaic power generation has been vigorously developed as a renewable clean energy power generation. Photovoltaic power generation is random, intermittent and uncontrollable. The large-scale connection of photovoltaic power generation has a great impact on the safe operation of the power system. Among them, the problem of reactive power and voltage is the most concerned, and it is also the most common in actual operation. one of the problems. [0003] With the development of photovoltaic power generation technology, the photovoltaic inverter has realized the decoupling control of active power and reactive power, and can independently adjust active power and reactive power. The photovoltaic inverter can be used as an important reactive power...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/38
CPCY02E10/563Y02E40/30Y02E10/56
Inventor 刘双张建周柏嵩丁宏
Owner NARI NANJING CONTROL SYST
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