Method and device for controlling three-phase unbalanced current of virtual synchronous generator

A virtual synchronization and balanced current technology, applied in the direction of reducing asymmetry of multi-phase network, eliminating/reducing asymmetry of multi-phase network, etc., can solve problems such as VSG unbalanced operation control, and achieve the effect of ensuring stability

Active Publication Date: 2015-11-25
STATE GRID CORP OF CHINA +3
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  • Claims
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Problems solved by technology

However, since the traditional inverter control directly obtains the current inner loop reference command through the power outer loop calculation, and the VSG needs to convert the power command into a voltage reference value after simulating t

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  • Method and device for controlling three-phase unbalanced current of virtual synchronous generator
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  • Method and device for controlling three-phase unbalanced current of virtual synchronous generator

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Embodiment Construction

[0044] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, in which the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0045] In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more than two, unless specifically defined otherwise.

[0046] In the present inventi...

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Abstract

The invention discloses a method and a device for controlling three-phase unbalanced current of a virtual synchronous generator. The method comprises the following steps: establishing a rotor movement equation of the virtual synchronous generator (VSG) and a virtual excitation equation of the VSG; decomposing unbalanced voltage of a power grid into positive sequence voltage, negative sequence voltage, zero sequence voltage and corresponding phase-sequence current, and decomposing active power and reactive power output by the VSG to analyze an encountered imbalance problem; calculating a reference instruction of dq axis current according to the output three-phase voltage signal; and converting the reference instruction of the current into a pulse-width modulation (PWM) voltage modulation signal through a self-designed current inner ring, and controlling the virtual synchronous generator to run through the PWM voltage modulation signal, so as to enable the output three-phase current of the virtual synchronous generator to reach the balance. According to the control method disclosed by the embodiment of the invention, the VSG can still output three-phase balanced current when the three-phase voltage of the power grid is unbalanced, so that the operation safety of the power grid can be relatively well ensured; and the method and the device are safe, reliable, simple and convenient.

Description

Technical field [0001] The present invention relates to the technical field of power control, in particular to a method and device for controlling three-phase unbalanced current of a virtual synchronous generator. Background technique [0002] The output of distributed power sources is generally direct current or non-power frequency alternating current, so it needs to be connected to the grid through a grid-connected inverter. Because traditional grid-connected inverters are static devices and cannot provide inertia and damping support for the grid, they cannot participate in grid regulation. As the penetration rate of distributed power sources increases, it will inevitably threaten the stability of grid operation. [0003] In recent years, grid-connected inverter control based on Virtual Synchronous Generator (VSG) has attracted attention. The basic idea of ​​VSG is to simulate the characteristics of a synchronous generator, and control the inverter by imitating the rotor motion ...

Claims

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 王东方陈来军张海宁王旭李春来陈天一杨立滨郑天文杨军李正曦
Owner STATE GRID CORP OF CHINA
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