Double-closed-loop control apparatus and control method of three-phase PWM voltage type inverter

Abstract

The invention relates to a double-closed-loop control apparatus and control method of a three-phase PWM voltage type inverter, and belongs to the field of an inverter control technology. Through combination of fractional-order PI and prediction function control, a novel FOPI-PFC algorithm is obtained, conventional PI control is replaced, such a method is introduced to an inverter voltage and current double-closed-loop system to replace a conventional prediction controller or a PI controller which is used by a voltage external ring so as to improve the system dynamic response capability and the anti-disturbance capability, and on the basis of this, a new fractional-order parameter is introduced, such that control is more flexible; and furthermore, a discrete sliding mode current controller is taken as a current controller of an internal ring, such that a good dynamic response capability and stable output voltages can be obtained.

Description

technical field [0001] The invention relates to a control device for an inverter, in particular to a double-closed-loop control device and a control method for a three-phase PWM voltage type inverter, and belongs to the technical field of inverter control. Background technique [0002] In the actual power system, sometimes it is necessary to convert DC power into AC power for the load. This process of converting DC power into AC power is called inverter. Inverters are widely used in inverter applications where DC generators, batteries, solar cells and fuel cells are the main DC power sources. With the increasing shortage of major energy sources such as oil, coal and natural gas, the development and utilization of new energy sources have attracted more and more attention. Inverters play a vital role in the development and utilization of new energy. [0003] It is generally believed that the development of inverter technology can be divided into the following three stages: ...

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Problems solved by technology

The advantage is that it has good stability and does not need to establish an accurate main circuit model, but the switching frequency is not fixed and the operation is irregular, which brings difficulties to the design of the filter

Introduce the double-loop control strategy of grid voltage feed-forward control [Zargari N, Joos G. Performance investigation of current controlled voltage regulated PWM rectifier in rotating and stationary frame [C]. Nineteenth Annual International Conference on Industrial Electronics, Maui Hawaii, USA, 1993. ] is beneficial to reduce the output current stability error, but cannot effectively suppress the resonance peak

Deadbeat control [Huang Tianfu, Shi Xinchun, Wei Debing, Sun Yuwei, Wang Dan. Research on three-phase photovoltaic grid-connected inverter based on current deadbeat control [J]. Power System Protection and Control, 2012,11:36- 41.] Calculate the pulse width of the next switching cycle according to the sinus

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