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Double DSP control method for photovoltaic grid-connected inverter

A control method and inverter technology, which are applied in the field of solar photovoltaic power generation, can solve the problems of no communication between the grid side and the photovoltaic side, and the inability to realize dual DSP control circuits, so as to improve system reliability, strong anti-interference ability, and easy implementation. Effect

Inactive Publication Date: 2010-09-22
盈威力新能源科技(上海)有限公司
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  • Application Information

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Problems solved by technology

[0006] The present invention aims at the shortcomings of the single DSP control scheme in the prior art and the problem that the dual DSP control circuit cannot realize the distributed and real-time control of the electrical isolation between the grid side and the photovoltaic side, and there is no communication between the grid side and the photovoltaic side. A dual DSP control method applied to photovoltaic grid-connected inverters is proposed. This method realizes direct sampling and real-time control on both the photovoltaic side and the grid side, which ensures the control effect and realizes the distributed control of the grid side and the photovoltaic side. , improves system reliability

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Embodiment

[0023] The present invention is a dual-DSP control method applied to a photovoltaic grid-connected inverter, which can be applied to a two-stage photovoltaic grid-connected inverter or a single-stage photovoltaic grid-connected inverter. In photovoltaic grid-connected inverters, the dual DSP control scheme can better reflect its superiority. Taking the control scheme applied to the single-stage photovoltaic grid-connected power generation system 10 as an example, the specific implementation process of the control method will be described below with reference to the accompanying drawings.

[0024] See attached figure 1 The overall schematic diagram of the photovoltaic grid-connected inverter applying the dual DSP control scheme of the present invention is shown, the inverter adopts the flyback circuit as the main power conversion circuit, and the H bridge circuit is the inverter circuit. The whole device is mainly composed of solar photovoltaic array 101, photovoltaic side DSP...

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Abstract

The invention discloses a double DSP control method for a photovoltaic grid-connected inverter and belongs to the technical field of solar photovoltaic grid-connected power generation. According to the technical scheme of the invention, both a photovoltaic side and a power grid side have a DSP; the control circuits of the two DSPs are electrically isolated and realize the control of the power grid side and the control of the photovoltaic side respectively; and the two DSPs communicates in a pulse width detection-based mode. According to the technical scheme, the conventional single-DSP control is replaced by double DSP control, so the rear-time control and monitoring of controlled objects are realized, the control accuracy is improved, the distributed control of the photovoltaic side and the power grid side is realized, the modular design of the control programs of on both sides is promoted, the design of the control programs is simplified, the system complexity is reduced, and the system reliability is improved. The pulse width detection-based communication mode has the advantages of simplicity, easy implementation, high anti-interference performance and the like.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to a dual DSP control method applied to a photovoltaic grid-connected inverter. Background technique [0002] As an inexhaustible new energy source, solar energy has very broad application and development prospects. Using solar power as an important way to solve environmental and energy crises is gaining huge economic and social benefits. [0003] Photovoltaic grid-connected inverters are an important tool for generating electricity using solar energy. With the continuous development of new energy technologies, photovoltaic grid-connected inverters have also developed from traditional two-stage centralized inverters to various topologies and power levels. , there are increasingly higher requirements for the reliability, efficiency and power density of photovoltaic grid-connected inverters. Various countries, including the United States, Europe and China,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02H7/26
CPCY02E10/563Y02E10/56
Inventor 古俊银
Owner 盈威力新能源科技(上海)有限公司
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