Three-phase PWM rectifier proportional complex integral control technology
A technology of integral control and rectifier, applied in AC network to reduce harmonics/ripple, convert AC power input to DC power output, output power conversion device, etc. question
Inactive Publication Date: 2019-04-26
HARBIN UNIV OF SCI & TECH
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Problems solved by technology
It is characterized by the design of the current loop control circuit in the double closed-loop control of the three-phase PWM rectifier, which solves the problem that the traditional PI control cannot eliminate the steady-state error of the grid-connected AC current, and eliminates the coupling of the mathematical model of the three-phase PWM rectifier in the αβ coordinate system , to achieve no static error control
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[0039] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0040] see figure 1 , is the structure diagram of the current loop control. To build the control structure, the control parameters must be designed first. For its transfer function G(s)=k p +k i / (s-jω 0 ) scale factor k p and k i To design, from the proportionality factor k p At the beginning of the design, in order to ensure that the rectification system has a very fast response speed and minimize noise within the same time, the rectification system must be selected to exceed 10 times the fundamental frequency and 1 / 5 lower than the open tube frequency. According to these requirements, the system frequency bandwidth range selected by the secondary rectification system is 500b <2000.
[0041] The control transfer function of ...
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The invention relates to the field of power electronic control, in particular to a three-phase PWM rectifier proportional complex integral control technology. A whole rectifying circuit is composed offour parts of a main circuit 1, a current loop control circuit 2, a voltage loop control circuit 3 and a phase-locked loop circuit 4; a PWM rectifier in the main circuit is triggered by an alternating-current power supply and a PWM waveform generator 5 to work, and is subjected to double closed loop control through a current loop 2 and a voltage loop 3; the values to be controlled by the voltage-type PWM rectifier lie in the output voltage of the rectifier and an input current of the rectifier, wherein the output voltage requires smooth derivative control, and the input current follows a phase position of the input voltage; and a phase-locked loop 4 adopts low-pass filtering. In order to solve the problem that traditional PI control cannot eliminate the steady state error of a synchronization alternating current, the current loop controlled by PCI is adopted to obtain the excellent rectifying effect.
Description
technical field [0001] The invention belongs to the field of power electronic control, and in particular relates to the proportional complex integral control technology of a three-phase PWM rectifier. Background technique [0002] At present, with the rapid development of renewable energy generation technologies such as wind energy, solar energy, and tidal energy, how to convert the variable low-quality electric energy generated by these energy sources into fixed high-quality electric energy that can be supplied to the grid has become a research hotspot. . The key point to improve power quality is rectification. In the early years, the diodes in the rectification circuit did not have the ability to be controlled, the direction of energy transmission was single, and the phase-controlled thyristors were easy to introduce harmonics. Three-phase PWM rectifiers came into being. Considering that the three-phase PWM rectifier needs to connect a high-efficiency filter large capacit...
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Login to View More IPC IPC(8): H02M7/219H02J3/01
CPCH02J3/01H02M7/219Y02E40/40
Inventor 徐军王继霞
Owner HARBIN UNIV OF SCI & TECH