Energy accumulating circuit for photovoltaic grid-connected inverter
A technology of energy storage control and energy storage circuit, applied in the field of solar photovoltaic power generation, can solve problems such as short life, low reliability, and high failure rate
Inactive Publication Date: 2014-09-17
SUZHOU SUNELINK POWER
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Problems solved by technology
[0005] The purpose of the present invention is to overcome the problems existing in the existing photovoltaic grid-connected inverters, and provide a new energy storage control circuit and control method applied to photovoltaic grid-connected inverters. The technical problems to be solved are: The digital control method is used to precisely control the output voltage of the solar cell array in the solar photovoltaic power generation system, which reduces the output voltage ripple of the solar cell array, which is conducive to improving the accuracy of MPPT and the conversion efficiency of the whole machine; through the use of boost mode for energy storage , avoiding the use of electrolytic capacitors, solving the problems of high failure rate, short life, and low reliability caused by the use of electrolytic capacitors, thereby improving the reliability and service life of photovoltaic grid-connected inverters
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[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the intended purpose of the invention, the energy storage control circuit and control system for photovoltaic grid-connected inverter proposed according to the present invention will be described below in conjunction with the accompanying drawings and preferred embodiments. The specific implementation, structure, features and effects of the method are described in detail below.
[0026] The flow of the energy storage control method applied to photovoltaic grid-connected converters provided by the present invention is shown in the attached figure 1 shown.
[0027] exist figure 1 In S100, the main control module obtains the current output voltage of the solar cell array in real time, and calculates the current reference voltage of the solar cell array in real time.
[0028] Specifically, the main control module may be a single chip microcomputer, FPGA (Field Programma...
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The invention relates to an energy accumulating circuit for a photovoltaic grid-connected inverter and a control method of the inverter. The control method comprises the following steps: real-time acquiring current output voltage and current reference voltage of a solar cell array by a main control module; when the current output voltage is larger than the current reference voltage, outputting an energy accumulating control signal to the energy accumulating circuit, accumulating energy by the energy accumulating circuit in a boosting manner to reduce the current output voltage of the solar cell array; when the current output voltage is lower than the current reference voltage, outputting an energy releasing control signal to the energy accumulating circuit, releasing the stored electrical energy by the energy accumulating circuit to increase the current output voltage of the solar cell array. According to the invention, the output voltage of the solar cell array can be controlled by a digital control manner, the output voltage ripple of the solar cell array is effectively reduced, which is good for improving the control precision of MPPT (maximum power point tracking); the usage of an electrolytic capacitor is avoided by the boosting manner, thereby increasing the reliability and service life of the photovoltaic grid-connected inverter.
Description
technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to an energy storage control circuit and a control method applied to photovoltaic grid-connected converters. Background technique [0002] In today's society, energy issues have attracted more and more attention. The increasing consumption rate of traditional energy such as oil and coal makes people feel the energy crisis. New renewable energy has attracted increasing attention due to its advantages of renewability and less environmental pollution, among which solar photovoltaic power generation is an important part of new renewable energy. [0003] Photovoltaic grid-connected inverter is one of the most important components of solar photovoltaic power generation system, its reliability and conversion efficiency directly affect the power generation efficiency of solar power generation system. In the existing photovoltaic grid-connected inverter technolo...
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IPC IPC(8): H02M7/48H02M3/335
CPCY02E10/56
Inventor 廖志贤韦迪
Owner SUZHOU SUNELINK POWER