Method, device and system for controlling photovoltaic grid connection on basis of virtual synchronous machine

A virtual synchronous machine and control method technology, applied in the field of electrical engineering, can solve the problem that the photovoltaic grid-connected system cannot take into account the voltage control of the photovoltaic array terminal and the realization of the virtual synchronous machine function, etc.

Active Publication Date: 2017-01-25
XUJI GRP +4
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a photovoltaic grid-connected control method based on a virtual synchronous machine, which is used to solve the pr...

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  • Method, device and system for controlling photovoltaic grid connection on basis of virtual synchronous machine
  • Method, device and system for controlling photovoltaic grid connection on basis of virtual synchronous machine

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Embodiment Construction

[0039] A photovoltaic grid-connected system based on a virtual synchronous machine, including a photovoltaic cell panel, a DC / DC converter, and a DC / AC inverter; the photovoltaic cell panel is connected to a DC bus; one end of the DC / DC converter is connected to the DC bus , one end is connected to the energy storage battery, the DC bus is connected to the DC side of the DC / AC inverter, and the AC side of the DC / AC inverter is connected to a transformer. Photovoltaic array power P pv and electromagnetic power P e It is sent to the grid through the inverter, and the inverter simulates the synchronous generator to output reactive power Q to the grid.

[0040] A photovoltaic grid-connected control method based on a virtual synchronous machine of the present invention, the method specifically includes the following steps:

[0041] 1) For DC / DC converter control steps: based on the double closed-loop control mode of power outer loop and current inner loop, establish a synchronous...

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Abstract

The invention discloses a method, a device and a system for controlling photovoltaic grid connection on the basis of a virtual synchronous machine. A photovoltaic grid connection system on the basis of the virtual synchronous machine comprises a photovoltaic cell panel, a DC/DC converter and a DC/AC inverter. The photovoltaic cell panel is connected with direct-current bus, one end of the DC/DC converter is connected with the direct-current bus, the other end of the DC/DC converter is connected with an energy storage cell, the direct-current bus is connected with a direct-current side of the DC/AC inverter, and an alternating-current side of the DC/AC inverter is connected into a transformer. The method, the device and the system have the advantage that the problem that an existing photovoltaic grid connection system is incapable of simultaneously controlling photovoltaic array terminal voltages and implementing functions of an existing virtual synchronous machine can be solved by the aid of the method.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and in particular relates to a photovoltaic grid-connected control method, device and system based on a virtual synchronous machine. Background technique [0002] Photovoltaic output has the characteristics of large and frequent random fluctuations. The increase in the penetration rate of the power grid will have an impact on the active power balance of the system and affect the frequency modulation characteristics of the system. It is different from the rotating motor of a conventional power plant. The photovoltaic power generation system connected to the grid is a non-rotating static component and does not have the moment of inertia of a conventional unit. Its large-scale connection to the grid will reduce the equivalent moment of inertia of the system, weaken the system's ability to cope with power fluctuations, and affect the system's frequency transient. stable level. [0003] Virtual ...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02J3/40
CPCH02J3/383H02J3/40H02J2203/20Y02E10/56
Inventor 肖飞张海龙王林黄辉黎阳曹建博
Owner XUJI GRP
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