A control method for parallel connection of photovoltaic off-grid multi-channel mppt controllers
A control method and controller technology, applied in photovoltaic power generation, AC network circuits, circuit devices, etc., can solve problems such as equipment not working, and achieve the effects of easy expansion, increased system stability, and convenient maintenance
Active Publication Date: 2018-05-22
JIANGSU EKSI ELECTRONICS
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Problems solved by technology
[0002] The traditional photovoltaic off-grid MPPT controller has only one power conversion circuit. When this part of the circuit is damaged, the device cannot work
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[0020] Such as Figure 1-3 As shown, a control method for parallel connection of photovoltaic off-grid multi-channel MPPT controllers, the controller involved in the method includes several DC / DC power conversion circuits 4 that correspond to photovoltaic modules 5 one-to-one and generate electrical connections, DC The / DC power conversion circuit 4 is electrically connected to the battery 2 , the load 1 , and the MPPT controller control unit 3 .
[0021] The first step of the method: judge the current state of charge of the storage battery 2, then calculate the duty ratio Duty of each DC / DC power conversion circuit 4, and output the PWM pulse from the MPPT controller control unit 3; the second step: use the PWM pulse Driving the IGBT switch tube in the DC / DC power conversion circuit 4, so that the DC / DC power conversion circuit 4 is in a high-frequency switching state;
[0022] The first step above is divided into constant current charging stage, voltage equalizing charging ...
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The invention discloses a photovoltaic off-grid multi-way MPPT controller parallel control method, and relates to the technical field of photovoltaic control. The controller related to the method comprises a plurality of DC / DC power conversion circuits which are in one-to-one correspondence with and are electrically connected photovoltaic assemblies. The DC / DC power conversion circuits are electrically connected with a storage battery, a load and an MPPT controller control unit. The method comprises the steps of firstly, judging the current charging state of the storage battery, then calculating the duty ratio Duty of each DC / DC power conversion circuit, and outputting PWM pulses by the MPPT controller control unit; and secondly, driving the built-in IGBT switching tubes in the DC / DC power conversion circuits by the PWM pulses, thereby enabling the DC / DC power conversion circuits to be in high frequency switching states. According to the method, the stability and reliability of a system are ensured, and faults are not liable to generate.
Description
technical field [0001] The invention relates to the technical field of photovoltaic control, in particular to a photovoltaic off-grid MPPT controller. Background technique [0002] The traditional photovoltaic off-grid MPPT controller has only one power conversion circuit. When this part of the circuit is damaged, the device cannot work. Contents of the invention [0003] The purpose of the present invention is to provide a control method for parallel connection of photovoltaic off-grid multi-channel MPPT controllers, which can ensure system stability and reliability, and is not prone to failure. [0004] The object of the present invention is achieved in this way: a control method for parallel connection of photovoltaic off-grid multi-channel MPPT controllers, the controller involved in the method includes several DC / DC power modules that correspond to the photovoltaic modules one-to-one and generate electrical connections. A conversion circuit, the DC / DC power conversio...
Claims
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IPC IPC(8): H02J3/38
CPCH02J3/385H02J3/388Y02E10/56
Inventor 周文鸣王飞仲崇勇徐国圣周峰
Owner JIANGSU EKSI ELECTRONICS