Self-synchronizing voltage source type photovoltaic power generation grid-connected anti-impact technology and device

A photovoltaic power generation, voltage source technology, applied in circuit devices, AC network voltage adjustment, electrical components, etc., can solve the problems of affecting the power quality of the power grid, large inrush current, etc., to maintain a constant, maintain the output voltage, and reduce the impact. Effect

Pending Publication Date: 2022-05-03
STATE GRID GANSU ELECTRIC POWER CORP +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] In order to solve the problem that there may be a large impact current in the photovoltaic grid-connected operation, thereby affecting the power quality of the grid, the present invention provides a self-synchronized voltage source type photovoltaic power generation grid-connected anti-shock technology and device, including:

Method used

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  • Self-synchronizing voltage source type photovoltaic power generation grid-connected anti-impact technology and device
  • Self-synchronizing voltage source type photovoltaic power generation grid-connected anti-impact technology and device
  • Self-synchronizing voltage source type photovoltaic power generation grid-connected anti-impact technology and device

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Embodiment 1

[0062] The invention provides a self-synchronizing voltage source type photovoltaic power generation grid-connected anti-impact method, such as figure 1 Shown: includes:

[0063] Step 1: Obtain the mechanical power output by the prime mover of the governor based on the obtained grid current parameters and the given value of the prime mover output mechanical power;

[0064] Step 2: Calculate the excitation current based on the grid current parameters and the variation law of the synchronous generator reference voltage amplitude, combined with the closed-loop control equation of the excitation controller;

[0065] Step 3: Based on the mechanical power output by the prime mover of the governor, the governor is used to perform a frequency regulation, and based on the excitation current, the excitation regulator is used to perform a voltage regulation, so as to realize the grid-connected impact of photovoltaic power generation.

[0066] Wherein, the mechanical power output by the ...

Embodiment 2

[0116] Based on the same inventive concept, the present invention also provides a self-synchronous voltage source type photovoltaic power generation grid-connected anti-shock device, which is characterized in that it includes: a governor and an excitation controller;

[0117] Both the governor and the excitation controller are located inside the generator and are electrically connected to the generator;

[0118] The governor obtains the mechanical power output by the prime mover of the governor based on the obtained grid current parameters and the given value of the prime mover output mechanical power to perform a frequency modulation;

[0119] The excitation controller performs primary voltage regulation based on the variation law of the grid current parameter and the reference voltage amplitude of the synchronous generator, combined with the excitation current calculated by the closed-loop control equation of the excitation controller.

[0120] Among them, it also includes: ...

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Abstract

The invention provides a self-synchronizing voltage source type photovoltaic power generation grid-connected anti-impact technology and device. The self-synchronizing voltage source type photovoltaic power generation grid-connected anti-impact technology comprises the steps of obtaining mechanical power output by a prime mover of a speed regulator based on an obtained power grid current parameter and a prime mover output mechanical power given value; on the basis of the power grid current parameter and the change rule of the reference voltage amplitude of the synchronous generator, combined with a closed-loop control equation of an excitation controller, calculating an excitation current; and performing primary frequency modulation by using a speed regulator based on the mechanical power output by the speed regulator prime mover, and performing primary voltage regulation by using an excitation regulator based on the excitation current to realize photovoltaic power generation grid-connected impact. The method of adding the speed regulator and the excitation controller to the generator set is beneficial to reducing the impact of the photovoltaic power grid, adjusting the frequency difference and the current in real time, and maintaining the output voltage of the synchronous generator to be constant.

Description

technical field [0001] The invention relates to the field of power transmission and distribution in electric power systems, in particular to a self-synchronizing voltage source type photovoltaic power generation grid-connected anti-shock technology and device. Background technique [0002] With the reduction of global energy and the continuous deterioration of the environment, energy conservation and environmental protection have attracted people's attention. Photovoltaic power generation technology has been widely used in distribution networks because of its clean and renewable energy. [0003] The main component of the photovoltaic power supply is the solar cell, and because the output of the solar cell is direct current, the inverter technology plays a very important role in the photovoltaic power generation system. In order to ensure higher flexibility and dispatchability, the photovoltaic power generation system can usually be operated in parallel with the distribution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/24H02J3/16
CPCH02J3/38H02J3/241H02J3/16H02J2300/24
Inventor 路民辉孙文文何国庆
Owner STATE GRID GANSU ELECTRIC POWER CORP
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