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Photovoltaic power generation system virtual synchronous machine control method, device, converter and system

A photovoltaic power generation system and virtual synchronous machine technology, applied in photovoltaic power generation, circuit devices, battery circuit devices, etc., can solve problems such as weak grid support capability and control delay.

Active Publication Date: 2021-07-06
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In essence, it is still the control of the current source, which depends on the frequency (obtained by the phase-locked loop) and the sampling of the voltage, there is a control delay, and the support ability to the power grid is weak

Method used

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  • Photovoltaic power generation system virtual synchronous machine control method, device, converter and system
  • Photovoltaic power generation system virtual synchronous machine control method, device, converter and system
  • Photovoltaic power generation system virtual synchronous machine control method, device, converter and system

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Experimental program
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Effect test

Embodiment 1

[0038] Such as image 3 As shown, by adding an energy storage link on the DC side of the photovoltaic module, the active power required for the frequency modulation response of the photovoltaic inverter (DC / AC) can be provided to meet the virtual synchronous machine control requirements of the photovoltaic inverter. The energy storage link includes energy storage equipment and energy storage converters (DC / DC). The present invention provides a virtual synchronous machine control method for a photovoltaic power generation system with additional energy storage, which divides the virtual synchronous machine control method for a photovoltaic power generation system with additional energy storage into two parts: energy storage converter control and photovoltaic inverter control, such as Figure 1-2 As shown, it specifically includes the following steps:

[0039] (1) Collect the voltage u of the photovoltaic module PV , current i PV And execute the maximum power point tracking (M...

Embodiment 2

[0047] This embodiment provides a virtual synchronous machine control device for a photovoltaic power generation system with additional energy storage, including: a photovoltaic inverter controller and an energy storage converter controller. The photovoltaic inverter controller and the energy storage converter controller store a virtual synchronous machine control program of the photovoltaic power generation system with additional energy storage, and execute the virtual synchronous machine control method of the photovoltaic power generation system.

Embodiment 3

[0049] This embodiment provides a virtual synchronous machine converter of a photovoltaic power generation system with additional energy storage, including a photovoltaic inverter and an energy storage converter. The photovoltaic inverter is connected between the photovoltaic module and the AC power grid, and is used to invert the direct current into alternating current to generate electricity for the power grid and realize virtual synchronous machine control, including: the photovoltaic inverter in the virtual synchronous machine control device A controller, a secondary loop and a primary loop; the primary loop is used to realize power transmission, conversion and filtering; the secondary loop is used to realize control signal sampling, transmission and conversion. The energy storage converter is connected between the energy storage device and the photovoltaic module, and is used for DC conversion, including: the energy storage converter controller, the secondary circuit and t...

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Abstract

The invention discloses a photovoltaic power generation system virtual synchronous machine control method, a control device, a converter and a system. The present invention connects the energy storage device and the energy storage converter on the DC side where the photovoltaic inverter is connected to the photovoltaic module; collects the voltage and current of the photovoltaic module and executes the maximum power point tracking algorithm to obtain the target value of the DC voltage, according to the The DC voltage target value controls the energy storage converter to operate in a constant output DC voltage mode; the DC power output by the photovoltaic module is multiplied by the conversion efficiency of the photovoltaic inverter, and the SOC of the superimposed energy storage device is optimized to adjust the power component as the photovoltaic inverter. The active power command is used to control the photovoltaic inverter to operate in a virtual synchronous machine mode according to the active power command. The invention only needs a small battery capacity to meet the application requirements, ensures the maximum power generation of the photovoltaic panel, optimizes the availability and life of the battery, and provides power support for the grid.

Description

technical field [0001] The invention belongs to the field of power electronic converter control, in particular to a control method, a control device, a converter and a system for a virtual synchronous machine of a photovoltaic power generation system with additional energy storage. Background technique [0002] Photovoltaic inverters are usually connected to the grid in the form of current sources to generate maximum power, synchronized with the grid through a phase-locked loop, and achieve maximum power generation through the maximum power point tracking (MPPT) algorithm. Photovoltaic inverters do not have the ability to actively respond to grid frequency and voltage changes, and have no inertia, so they lack the ability to support the grid. In recent years, the Virtual Synchronous Generator (VSG) has been used more and more due to its excellent characteristics such as autonomous frequency regulation, autonomous voltage regulation, inertia, and damping. [0003] When the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J7/35
CPCH02J3/385H02J7/35H02J2203/20Y02E10/56
Inventor 吴跨宇房乐张兴李旭卢岑岑沈轶君刘为群熊鸿韬卢嘉华陆海清楼伯良黄弘扬张建承丁勇石祥建
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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