A Fast Calculation Method for Virtual Shaft Voltage and Current of Single-phase Grid-connected Converter

A fast calculation and virtual axis technology, applied in the direction of single-network parallel feeding arrangement, irreversible DC power input conversion to AC power output, etc., can solve problems such as system oscillation and influence on grid connection effect, and achieve voltage and current response The effect of increasing speed

Active Publication Date: 2021-03-23
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

Although the conventional scheme is simple, the virtual voltage and current signals will respond after 1 / 4 of the power grid cycle. Once the system voltage and current change, the system will oscillate to varying degrees, seriously affecting the grid connection effect

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  • A Fast Calculation Method for Virtual Shaft Voltage and Current of Single-phase Grid-connected Converter
  • A Fast Calculation Method for Virtual Shaft Voltage and Current of Single-phase Grid-connected Converter
  • A Fast Calculation Method for Virtual Shaft Voltage and Current of Single-phase Grid-connected Converter

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Embodiment Construction

[0046] In order to better understand the present invention, the present invention will be further described below in conjunction with accompanying drawing and specific embodiment:

[0047] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0048] The present invention aims at the characteristic that the single-phase grid-connected converter has only a single AC quantity, and calculates the virtual axis voltage signal orthogonal to the actual single-phase voltage signal by phase lagging 1 / 12 of the grid cycle; by using the instantaneous active power command and the instantaneous The reactive power command calculates a virtual shaft current signal in quadrature to the actual single-phase current signal. Then the AC current voltage and signal in the two-phase stationary coordinate system are converted into DC current signals in the synchronous rotating coordinate system, and the PI controller i...

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Abstract

The invention discloses a method for quickly calculating virtual axis voltage and current of a single-phase grid-connected converter, and relates to the field of single-phase grid-connected convertercontrol systems in the technical field of power electronics. The method comprises the steps of: calculating a virtual axis voltage signal orthogonal to an actual single-phase voltage signal through phase lag of 1 / 12 power grid periods; and calculating a virtual axis current signal orthogonal to the actual single-phase current signal by using an instantaneous active power command and an instantaneous reactive power command. The generated virtual axis voltage and current signals and the actual single-phase voltage and current signals form a two-phase orthogonal system, so that the vector controlmethod widely used in the three-phase grid-connected converter is successfully applied to a single-phase grid-connected converter occasion. The virtual axis voltage and current rapid calculation method enables the system voltage and current response speed to be greatly improved.

Description

technical field [0001] The invention relates to a fast calculation method for virtual axis voltage and current of a single-phase grid-connected converter, which belongs to the field of single-phase grid-connected converter control systems in the technical field of power electronics. Background technique [0002] With the continuous improvement of the performance of power electronic devices, the grid-connected converter has become an important interface for distributed renewable energy to connect to the distribution network, and its control method directly affects the power (energy) flow, conversion efficiency and power quality. The real-time, accurate and efficient control performance of grid-connected converters has obvious practical significance for developing distributed renewable energy, ensuring the security of distribution network and promoting the construction of smart grid. As the penetration rate of distributed renewable energy continues to increase, it has brought ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02J3/38
CPCH02J3/38H02M7/48
Inventor 吴宁肖静孙乐平韩帅陈卫东冯玉斌金庆忍郭敏姚知洋
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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