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Converter based on virtual synchronous generator and control method thereof

A technology of virtual synchronization and control method, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of complex converter control, and achieve the effects of frequency stability, precise control and simple switching

Active Publication Date: 2018-08-21
XUJI GRP +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a converter based on a virtual synchronous generator and its control method to solve the problem of complicated converter control in the prior art

Method used

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  • Converter based on virtual synchronous generator and control method thereof
  • Converter based on virtual synchronous generator and control method thereof
  • Converter based on virtual synchronous generator and control method thereof

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Embodiment Construction

[0040] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] Such as figure 2 Shown is the control block diagram of the converter based on the virtual synchronous generator of the present invention.

[0042] In the normal operation of the power grid, the three-phase stator current output by the VSG controller is transformed into the dq coordinate system, and the obtained values ​​are respectively used as the d-axis current command value of the converter current inner loop and the q of the converter current inner loop Shaft current command value, and the grid voltage phase angle is used as the phase angle command value of the current inner loop of the converter, and the PWM wave is generated for control through the grid voltage oriented vector control.

[0043] figure 2The phase-locked loop PLL, co...

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Abstract

The invention relates to a converter based on a virtual synchronous generator and a control method thereof. When a VSG function module is cut in, three-phase stator current outputted by the VSG function module is used as an instruction value of a converter current inner ring, a power grid voltage phase angle of power grid voltage through a phase-locked loop is used as a phase angle instruction value of the converter current inner ring, and through power grid voltage directional vector control, PWM waves are generated for control. On the basis of reserving the characteristics of accurate and flexible current control, stable frequency and the like of the conventional converter, the converter has a voltage source output characteristic similar to that of a synchronous generator. The VSG function of the converter can be input and cut out seamlessly, the switching is simple, and the method is particularly suitable for multifunctional online switching of the converter with the VSG function and power grid fault ride through control.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and in particular relates to a converter based on a virtual synchronous generator and a control method thereof. Background technique [0002] The installed capacity of intermittent energy represented by photovoltaics and wind power accounts for an increasing proportion of the total installed capacity of the system. However, the large and frequent random fluctuations of intermittent energy output impact the active power balance of the system and affect the frequency modulation characteristics of the system. Unlike the rotating motors of conventional power plants, the intermittent energy connected to the grid through power electronic equipment is non-rotating. Static components do not have the moment of inertia of conventional units, and their large-scale connection to the grid will reduce the equivalent moment of inertia of the system, weaken the system's ability to deal with power ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02J3/00
CPCH02J3/00H02M1/00H02J2203/20H02M1/0003
Inventor 肖飞王林王卓然孙辰军黄辉龚培娇耿志清
Owner XUJI GRP
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