Control analysis method for inverters in grid-connected test power supply

A technology for controlling, analyzing, and testing power supplies. It is used in electrical components, single-network parallel feeding arrangements, and output power conversion devices. It can solve the problems of weak anti-interference ability and difficulty in achieving output target without static error control, and achieve elimination. Steady state error, effect of gain increase

Inactive Publication Date: 2016-12-14
SHANGHAI DIANJI UNIV
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AI Technical Summary

Problems solved by technology

[0005] (1) It is difficult to realize the static-difference-free control of the output target;
[0006] (2) Weak anti-interference ability

Method used

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  • Control analysis method for inverters in grid-connected test power supply
  • Control analysis method for inverters in grid-connected test power supply
  • Control analysis method for inverters in grid-connected test power supply

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Embodiment Construction

[0039] The present invention will be further explained below in conjunction with specific embodiments and drawings.

[0040] A control analysis method of an inverter in a grid-connected test power supply. The control analysis method includes the following steps:

[0041] 1. Determine the topology of the inverter in the grid-connected test power supply

[0042] Under normal circumstances, the most widely used and simplest three-phase inverter solution is to directly use a three-phase full-bridge inverter circuit to achieve three-phase AC output. This type of topology has the advantages of simple control, mature technology, and easy realization of three-phase AC output. However, because it is a three-phase three-wire system (without neutral), there are zero sequence components that cannot accurately simulate unbalanced voltages. Shortcomings.

[0043] Therefore, the inverter in this control analysis method uses three single-phase full-bridge inverter circuits. This kind of inverter ci...

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Abstract

The invention relates to a control analysis method for inverters in a grid-connected test power supply, and belongs to the technical field of electronic power. The control analysis method for the inverters in the grid-connected test power supply comprises the following steps that (1) the topological structure of the inverters in the grid-connected test power supply is determined; (2) the model of an inversion circuit is constructed; (3) the control strategy of the inversion circuit is determined; (4) quasi PR control analysis is performed; (5) the transfer function of a quasi PR controller is discretized, modeling of the discretized PR controller is performed through Simulink and then various control parameters of the inverters are calculated; and (6) a 30KW hardware-in-the-loop grid-connected test power supply dual-core control experiment platform is established based on dSPACE and the correctness of the control model is verified. According to the method, PR control is adopted, and the specific frequency can be accurately tracked by PR control in comparison with PI control so that the gain of the frequency is increased and the steady state error of PI control is eliminated.

Description

Technical field [0001] The invention belongs to the technical field of electronic power, and particularly relates to a control analysis method of an inverter in a grid-connected test power supply. Background technique [0002] In recent years, the large-scale development and utilization of fossil energy has reduced mineral resources and the problem of environmental pollution has become increasingly serious. The advantages of traditional thermal power generation using fossil energy are no longer obvious. With the development of science and technology, countries all over the world pay more and more attention to the development and utilization of renewable energy (solar energy, wind power, water conservancy and other new energy), and promote the development of renewable energy as the basic choice of energy development in the 21st century. my country has also issued a series of policies to solve environmental problems and promote the development of renewable energy. Renewable energy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387H02J3/38
CPCH02M7/53873H02J3/38
Inventor 范辉刘邓刘军
Owner SHANGHAI DIANJI UNIV
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