Control method of clamping-type three-phase non-isolation photovoltaic inverter with follow-current switch

A photovoltaic inverter and freewheeling switch technology, applied in photovoltaic power generation, AC power input conversion to DC power output, AC network circuits, etc., can solve the problem of increasing system electromagnetic interference, endangering personal and equipment safety, and affecting network access Current quality and other issues to achieve the effect of improving efficiency, reducing loss, and reducing common-mode voltage

Active Publication Date: 2017-06-13
NANJING UNIV OF POSTS & TELECOMM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the removal of the transformer leads to an electrical connection between the input and output. Due to the existence of the capacitance of the battery board to the ground, the common mode leakage current will be generated when the inverter is working, which will increase the electromagnetic interference of the system and affect the quality of the incoming current. Personal and Equipment Safety

Method used

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  • Control method of clamping-type three-phase non-isolation photovoltaic inverter with follow-current switch
  • Control method of clamping-type three-phase non-isolation photovoltaic inverter with follow-current switch
  • Control method of clamping-type three-phase non-isolation photovoltaic inverter with follow-current switch

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Embodiment Construction

[0037] The technical solution of the present invention will be further described in detail below in conjunction with the accompanying drawings:

[0038] The control method of the clamped three-phase non-isolated photovoltaic inverter with freewheeling switch is only applicable to the clamped three-phase non-isolated photovoltaic inverter with freewheeling switch (the inverter circuit topology is as attached figure 1 Shown), a clamp-type three-phase non-isolated photovoltaic inverter with freewheeling switch, including solar cells U PV , Three-phase bridge inverter, filter circuit and load circuit, also including freewheeling switch and clamp circuit, three-phase bridge inverter including first to sixth switch tubes S 1 - S 6 , The filter circuit includes first to third filter inductors L a , L b , L c And the first to third filter capacitors C fa , C fb , C fc , The load circuit includes first to third resistors R a , R b , R c , The freewheeling switch includes the seventh switch...

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Abstract

The invention discloses a control method of a clamping-type three-phase non-isolation photovoltaic inverter with a follow-current switch. The method comprises the following steps: generating preprocessing signals of six bridge arm switch tubes of the inverter by virtue of a three-phase sinusoidal wave signal and one triangular wave signal through intersecting, determining a state of the six preprocessing signals, and determining whether the inverter is in a non-follow-current switch state or a follow-current switch state; when the inverter is in a non-follow-current switch mode, performing three-phase SPWM modulating control on the six bridge arm switch tubes, and keeping a follow-current switch tube and two clamping switch tubes at an off state; and when the inverter is in a follow-current switch mode, keeping the six bridge arm switch tubes at an off state, connecting the follow-current switch tube, and selectively connecting the clamping switch tubes according to the situation. By adopting the control method, a step of feeding back energy to a power supply is saved, the conversion efficiency of the non-isolation photovoltaic inverter is improved, and the common-mode leaked current of the photovoltaic inverter is inhibited.

Description

Technical field [0001] The invention relates to the technical field of power electronic DC-AC conversion, in particular to a control method of a clamped three-phase non-isolated photovoltaic inverter with a freewheeling switch. Background technique [0002] Photovoltaic grid-connected inverters require high efficiency, low cost, can withstand the adverse effects of large fluctuations in the output voltage of photovoltaic cells, and their AC output must also meet high power quality. [0003] According to whether the inverter has an isolation transformer or not, it can be divided into isolated type and non-isolated type. The isolated photovoltaic inverter realizes the electrical isolation between the power grid and the battery panel, ensuring the safety of people and equipment. However, its volume is large, the price is high, and the system conversion efficiency is low. The non-isolated photovoltaic inverter structure does not contain a transformer, and has many advantages such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCH02J3/383H02M7/5387Y02E10/56
Inventor 马海啸刘彬段新锋
Owner NANJING UNIV OF POSTS & TELECOMM
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