A three-port boost integrated converter for photovoltaic energy storage system and control method
A technology for photovoltaic energy storage and control methods, applied in current collectors, photovoltaic power generation, control/regulation systems, etc., can solve the problems of low overall efficiency, large volume and weight, complex structure, etc., to improve integration and efficiency, flexible control , the effect of reducing costs
Active Publication Date: 2021-04-13
NANTONG UNIVERSITY
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Problems solved by technology
The existing photovoltaic energy storage system can effectively realize energy management and control, but there are disadvantages such as complex structure, large number of components, large volume and weight, low overall efficiency, and high cost.
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[0032] The present invention will be further described below in conjunction with the accompanying drawings.
[0033] Such as figure 2 Shown is a three-port Boost integrated converter for a photovoltaic energy storage system. The photovoltaic energy storage system is composed of a control circuit 1, a drive module 2 and a main circuit, as shown in Figure 7As shown, the main circuit is composed of a three-port Boost integrated converter, and the three-port Boost integrated converter 3 is provided with three ports, and the three ports are respectively a photovoltaic port, a storage battery port and a load port, There is only one switch tube in the three-port Boost integrated converter 3, the switch tube S is provided with three pins, and the three-port Boost integrated converter 3 is composed of a switch tube S, an inductor L1, an inductor L2, a capacitor C1, Composed of capacitor C2, capacitor C3, switch tube S, diode D1, diode D2, diode D3, photovoltaic port, battery port, a...
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The invention discloses a novel three-port Boost integrated converter for a photovoltaic energy storage system. The three-port Boost integrated converter only contains one switch tube, the inductance L1 works in DCM mode, and the inductance L2 works in CCM mode. model. By adopting the PWM+PFM hybrid modulation strategy and adjusting the duty ratio D and the switching frequency fs at the same time, the PFM closed-loop control is adopted for the voltage at the photovoltaic array terminal, and the PWM closed-loop control is used for the voltage at the load terminal, and then the photovoltaic array terminal voltage and the voltage at the load terminal of the system are respectively controlled. load terminal voltage. Compared with the main circuit of the traditional photovoltaic energy storage system formed by cascading the Boost photovoltaic interface PWM converter and the Boost energy storage interface PWM converter, the proposed three-port Boost integrated converter reduces a switch tube and its drive module. The integration degree and efficiency of the system are improved, and the cost is reduced.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a three-port Boost integrated converter for a photovoltaic energy storage system and a control method. Background technique [0002] With the increasing energy crisis and environmental pollution, photovoltaic power generation technology has attracted extensive attention from governments and enterprises in various countries. Due to the volatility and randomness of solar energy, photovoltaic power generation systems need to be equipped with batteries to store and adjust electric energy to ensure continuous and stable power supply to loads (such as DC converters, inverters, DC microgrids, etc.). Therefore, the photovoltaic energy storage power generation system has three ports of photovoltaic, battery and load, and usually uses two converters of photovoltaic interface and energy storage interface to realize the maximum power point tracking control of the photovoltaic array...
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IPC IPC(8): H02M3/155H02J7/35
CPCH02J7/35H02M3/155Y02E10/56
Inventor 秦岭田民沈家鹏尹铭高娟段冰莹周磊韩启萌张宇妍赵海龙
Owner NANTONG UNIVERSITY