Miniature photovoltaic grid-connected inverter with reduced DC bus capacitance and its control method
A DC bus capacitor and inverter technology, which is applied in the direction of converting DC power input into DC power output, photovoltaic power generation, and adjusting electrical variables, can solve the problem of increasing the volume of the solar photovoltaic grid-connected power generation system and shortening the solar photovoltaic grid-connected power generation system. service life, reducing the reliability of solar photovoltaic grid-connected power generation systems, etc., to achieve the effect of facilitating maximum power point tracking, improving power generation efficiency and service life, and reducing power generation costs
Inactive Publication Date: 2016-01-06
TIANJIN UNIV
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However, the introduction of electrolytic capacitors not only increases the volume of the entire solar photovoltaic grid-connected power generation system, but also greatly shortens the service life of the solar photovoltaic grid-connected power generation system and reduces the reliability of the solar photovoltaic grid-connected power generation system.
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[0027] The structure and control device of the miniature photovoltaic grid-connected inverter system optimized for DC bus capacitor optimization described in this paper, the hardware system diagram of the device is shown in figure 1 As shown, its main circuit part includes photovoltaic panel 1, phase-shifted full-bridge circuit 2, high-frequency transformer, full-bridge rectifier circuit 3, DC bus capacitor, power decoupling circuit 4 and inverter circuit 5, control and drive circuit Including photovoltaic current output sampling circuit, photovoltaic output voltage sampling circuit, power MOSFET drive circuit, capacitor voltage sampling circuit, grid-connected current sampling circuit, phase-locked loop circuit and DSP controller, in which photovoltaic panels provide DC power for the device, phase shifting The full-bridge circuit realizes the inverter from DC to high-frequency AC, and realizes the function of tracking the maximum power point of the device. After the high-frequ...
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The invention belongs to the field of photovoltaic power generation, applies a power decoupling circuit to reduce the capacity of a capacitor at the side of a DC (Direct Current) bus for prolonging the service life and improving the reliability of the inverter, replaces an electrolytic capacitor with high capacity and a short service life with a thin film capacitor with low capacity and a long service life and designs a miniature photovoltaic grid-connected inverter. To fulfill the aims, the invention adopts the technical scheme that the miniature photovoltaic grid-connected inverter with an optimized DC bus capacitor comprises a main circuit and a control and driving circuit, wherein the main circuit is formed by a photovoltaic cell panel, a phase-shift full-bridge circuit, a high frequency transformer, a full-bridge rectifying circuit, the DC bus capacitor, the power decoupling circuit and an inverter circuit which are sequentially connected; the control and driving circuit comprises a photovoltaic output current sampling circuit, a photovoltaic output voltage sampling circuit, a power MOSFET (Metal Oxide Semiconductor Field Effect Transistor) driving circuit, a capacitor voltage sampling circuit, a grid-connected current sampling circuit, a phase-locked loop circuit and a DSP (Digital Signal Processor) controller. The miniature photovoltaic grid-connected inverter is mainly applied to photovoltaic power generation.
Description
technical field [0001] The invention belongs to the field of photovoltaic power generation, and more specifically relates to a micro-inverter for photovoltaic power generation using a power decoupling circuit and a control method thereof, that is, a micro-photovoltaic grid-connected inverter with optimized DC bus capacitance and a control method thereof. technical background [0002] As a pollution-free and renewable new energy source, solar energy has very broad application and development prospects. With the increasing shortage of natural resources such as oil and natural gas, and the severe situation of abnormal global climate change, clean renewable energy has become increasingly popular. Pay attention to. Photovoltaic power generation occupies an important position in it, and it provides a reliable way to solve the energy supply of production and life and improve environmental pollution. [0003] Due to its advantages of high efficiency, simple and convenient expansion...
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IPC IPC(8): H02M7/5387H02M3/335H02J3/38
CPCY02E10/56
Inventor 王萍周哲王尉梁富军郭琳
Owner TIANJIN UNIV