Three-phase grid-connected inverter double-loop control method based on proportional complex integral control

A technology of three-phase inverter and double-loop control, which is applied in the direction of single-network parallel feeding arrangement, AC network to reduce harmonic/ripple, wind power generation, etc. It can solve the problems of increasing system consumption and affecting efficiency, and achieves tracking Good effect, high power factor, and strong system reliability

Inactive Publication Date: 2018-09-21
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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This method is simple and effective, but the added resistance wi

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  • Three-phase grid-connected inverter double-loop control method based on proportional complex integral control
  • Three-phase grid-connected inverter double-loop control method based on proportional complex integral control
  • Three-phase grid-connected inverter double-loop control method based on proportional complex integral control

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[0027] figure 1 It is the overall structure block diagram of the dual-loop control method of the three-phase grid-connected inverter with LCL filter based on the proportional complex integral PCI control of the present invention, including a DC voltage source, a high-frequency switch three-phase inverter, an LCL filter, and a It is used to detect the grid current and the filter capacitor current detection transmitter, the grid voltage three-phase phase-locked loop module, and the coordinate transformation unit that converts the three-phase current in the three-phase static coordinate system into the two-phase current in the two-phase static coordinate system 1 And coordinate transformation unit 2, respectively used to transform the three-phase current of the grid side and the three-phase current of the filter capacitor, and transform the command current from the two-phase rotating coordinate system to the coordinate transforming unit of the two-phase static coordinate system. T...

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Abstract

The invention relates to a three-phase grid-connected inverter double-loop control method based on proportional complex integral control. The inner loop adopts filter capacitor current feedback control, the outer loop control adopts PCI control, infinite gain can be achieved at the fundamental wave, an alternating current designated signal is effectively tracked, the control precision of network entry current is improved, tracking without steady-state error is basically achieved, and the network entry current power factor is increased; by adopting double-loop control, the system damping is increased, a resonance peak of the system is effectively restrained, the system stability is improved, compared with traditional PI control and quasi-resonance control, under the same parameter condition, the system has the higher stability margin, and the reliability is greatly enhanced. The waveform quality, the tracking precision and the power factor of grid-connected current are improved, meanwhile, a bridge arm switching tube can be protected, and it is ensured that the inverter system is safely and reliably operated. The method is applicable to solar power generation, wind power and other new energy grid-connected systems, and can be popularized to a control method of other single-phase or three-phase grid-connected inverters.

Description

technical field [0001] The invention relates to an inverter control technology, in particular to a dual-loop control method for a three-phase grid-connected inverter based on proportional complex integral control. Background technique [0002] With the development of economy and energy consumption in modern society, the pollution caused by traditional fossil energy and its own depletion are inevitable. Human beings pay more attention to renewable energy. Wind energy and solar energy are clean and non-polluting new energy sources with rich content and are the first choice. The inverter technology is one of the extremely important technologies in the process of connecting new energy to the grid. [0003] The inverter output current must pass through a filter to filter out high-order harmonics. The commonly used filters today are L-type filters, LC-type filters and LCL-type filters. The L-type filter has a simple structure and is easy to implement, but the filtering effect is...

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Application Information

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IPC IPC(8): H02J3/38H02J3/01
CPCH02J3/01H02J3/38Y02E10/76Y02E40/40
Inventor 杨旭红张云飞薛冰吴斌尹聪聪孙克帅陈昊刘洋孙越姚凤军
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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