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Practical stable control method for single-phase inverter

A stable control method and single-phase inverter technology, applied in the direction of converting irreversible DC power input into AC power output, can solve the problems of reducing MPC flexibility and poor practicability, and achieve easy implementation, simple logic, and high efficiency. Effect of Precision Tracking Control

Inactive Publication Date: 2018-07-24
XIAMEN UNIV +1
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

Its method uses the Lyapunov function as the cost function of MPC, which reduces the flexibility of MPC and has poor practicability

Method used

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  • Practical stable control method for single-phase inverter
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  • Practical stable control method for single-phase inverter

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Embodiment Construction

[0043] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0044] Compared with the conventional inverter control method, the control method of the present invention mainly proceeds from the perspective of practical stability, obtains a stable control law, and realizes inverter current tracking control.

[0045] see figure 1 As shown, the present invention uses inverters, current sensors, drivers and other circuit modules to build an inverter system, obtains the current information of the circuit through the current sensor, and then adds the current signal as feedback to the control model. According to the endpoint equivalent method, The practical stable control law of the inverter controlled by PWM is deduced, and then transmitted to the controller, the controller outputs the control signal, transmitted to the driver, drives the inverter, and realizes the accurate and stable tracking of the inverter ...

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Abstract

The invention provides a practical stable control method for a single-phase inverter. The controller is based on PWM control, and a discrete passive Lyapunov function is constructed to obtain an asymptotically stale discrete system and eliminate limited switching rates. An endpoint equivalent method is used to eliminate the constraints of an input finite set. By solving an endpoint equation, aninverter current tracking control law of practical stability is derived, and the derivation indicates that the PWM under the equal area principle means practical stability. The method considers a switching process and is more accurate than a PWM method. The provided method establishes a bridge between a traditional stability control and the input finite set control, and provides support for directly transplanting the traditional input-free limited system control method to the input limited system. The method realizes high-precision tracking control of the output current of the single-phase inverter under the practical stability concept, can ensure the feasible current tracking of the inverter, and the tracking error is convergent.

Description

technical field [0001] The invention belongs to the field of converter control, and in particular relates to a control method for ensuring the practical stability of a single-phase inverter circuit. Background technique [0002] By controlling the switching elements on and off, the inverter can change the current from DC to AC. At this stage, inverters have been widely used in industrial fields, such as photovoltaic grid-connected systems and AC motor drive systems. Unstable inverter control methods will lead to inverter failure, which will affect system performance in mild cases, and even cause breakdown of switching elements in severe cases, threatening production and life safety. [0003] The main inverter control methods include proportional-integral control (PI), sliding mode control, model predictive control (MPC) and intelligent control, etc. These methods realize the tracking control of inverter current or improve the control effect from different angles. The metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 李钷林霞刘瑞楠李睿煜张景瑞关明杰
Owner XIAMEN UNIV
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