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Novel three-port Boost integrated converter for photovoltaic energy storage system and control method

A photovoltaic energy storage and control method technology, applied in the direction of collectors, photovoltaic power generation, control/regulation systems, etc., can solve the problems of low overall efficiency, large volume and weight, complex structure, etc., to achieve improved integration and efficiency, and flexible control , cost reduction effect

Active Publication Date: 2019-10-15
NANTONG UNIVERSITY
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AI Technical Summary

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.

Method used

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  • Novel three-port Boost integrated converter for photovoltaic energy storage system and control method
  • Novel three-port Boost integrated converter for photovoltaic energy storage system and control method
  • Novel three-port Boost integrated converter for photovoltaic energy storage system and control method

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Embodiment Construction

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] Such as figure 2 Shown is a new three-port Boost integrated converter for photovoltaic energy storage system. The photovoltaic energy storage system is composed of control circuit 1, drive module 2 and 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, and l...

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Abstract

The invention discloses a novel three-port Boost integrated converter for a photovoltaic energy storage system. The three-port Boost integrated converter only has one switching transistor. An inductorL1 works in a DCM mode, and an inductor L2 works in a CCM mode. By using a PWM+PFM hybrid modulation strategy and adjusting a duty cycle D and a switching frequency fs, PFM closed-loop control is applied to the photovoltaic array terminal voltage and PWM closed-loop control is applied to the load terminal voltage so as to control the photovoltaic array terminal voltage and the load terminal voltage. Compared with the main circuit of a traditional photovoltaic energy storage system which is formed by a cascaded Boost photovoltaic interface PWM converter and Boost energy storage interface PWM converter, the provided three-port Boost integrated converter removes one switching transistor and its driving module, improve system integration and efficiency, and reduce costs.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a novel 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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
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