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Distributed photovoltaic power generation system control strategy based on improved virtual synchronous generator

A distributed photovoltaic and virtual synchronization technology, applied in photovoltaic power generation, single-grid parallel feeding arrangement, etc., can solve the problem of no distributed photovoltaic power supply virtual synchronous generator connected to the power grid, etc., to achieve convenient implementation and good application prospects , the effect of low computational complexity

Inactive Publication Date: 2019-06-11
LIAONING INST OF SCI & TECH
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Problems solved by technology

[0005] The traditional virtual synchronous generator control technology is aimed at the situation where there is sufficient energy storage capacity on the DC side of distributed photovoltaic power generation. Fundamentally realize that distributed photovoltaic power sources are connected to the grid in the form of virtual synchronous generators

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  • Distributed photovoltaic power generation system control strategy based on improved virtual synchronous generator
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  • Distributed photovoltaic power generation system control strategy based on improved virtual synchronous generator

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Such as figure 1As shown, the present invention includes a photovoltaic array, a DC / DC conversion circuit, a DC / AC conversion circuit, an AC bus, an MPPT controller, an improved power frequency controller, an improved excitation controller, a virtual synchronous generator body, and a SPWM pulse generation device, the output end of the photovoltaic array is connected to the input end of the DC / DC conversion circuit, the output end of the DC / DC conversion circuit is connected to the input end of the DC / AC conversion circuit, and the output end of the DC / AC conversion circuit is respectively connected to the AC through the LC filter circuit The bus bar, the signal input terminal of the improved power frequency controller, the signal input terminal of the improved excitation controller, and the signal input terminal of the virtual synchronou...

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Abstract

The invention discloses a distributed photovoltaic power generation system control strategy based on an improved virtual synchronous generator. By further adopting a DC voltage stability control technology based on the traditional virtual synchronous generator control technology to optimize the structures of a power frequency controller and an excitation controller of the virtual synchronous generator, an improved virtual synchronous generator control strategy that does not depend on the energy storage device is proposed. When the photovoltaic power output power is lower than the load power orthe grid dispatch power demand, the effect of suppressing the dropping of the DC bus voltage and maintaining the stability of the DC voltage is taken, and the purpose of power matching according to the load or grid-connected power demand is achieved such that the photovoltaic power source can directly realize grid-off or grid-connected operation in the form of a virtual synchronous generator.

Description

technical field [0001] The invention belongs to the technical field of distributed photovoltaic power generation control, and in particular relates to a distributed photovoltaic power generation system control strategy based on an improved virtual synchronous generator. Background technique [0002] With the rapid development of the economy, the demand for energy in social production is increasing, the traditional fossil energy is decreasing, the environmental pollution is becoming more and more serious, energy and environmental problems are becoming more and more apparent, and the development of green renewable energy to replace fossil energy has become an energy source. inevitable trend of development. [0003] As a typical renewable energy, solar energy has become an ideal green energy that conforms to the concept of social sustainable development because of its advantages such as wide distribution, no pollution, and flexible use. Distributed photovoltaic power generatio...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/56
Inventor 高长伟关大陆樊爱龙赵乃正
Owner LIAONING INST OF SCI & TECH
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