A unified control method for rectifier and inverter
A control method and rectifier technology, which is applied to the unified control of rectifiers and inverters, and the field of control loop design of rectifiers and inverters, can solve the problems of increasing the control software development cycle and complicating program code debugging, and shorten the software Effect of development cycle, simplified commissioning and maintenance work
Active Publication Date: 2019-02-05
ZHEJIANG UNIV
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Problems solved by technology
In a back-to-back system consisting of three-phase four-wire PWM rectifiers and inverters, such as an online UPS system, the control systems of the rectifiers and inverters usually need to be designed separately, and engineers must master two different control systems The design method not only increases the control software development cycle, but also makes the debugging of the program code more complicated
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[0017] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0018] Such as figure 2 As shown, the control part is mainly composed of three modules, including the instantaneous value control module 1, the harmonic control module 2, and the phase synchronization module 3. The main circuit includes a DC bus capacitor 4, a power device bridge arm 5, an LC filter 6, and a load / grid 7. The four parts are sequentially connected in series. When the switch 29 is switched to "1", the main circuit indicates the rectifier mode, and the switch 29 is switched When it reaches "2", the main circuit indicates inverter mode.
[0019] The instantaneous value control module 1 includes a first controller unit 8, a first multiplier unit 12, a cosine value calculation unit 11, a second controller unit 9, a first adder unit 13, a third controller unit 10 and a second adder unit device unit 14. The two sets of inputs of the first controller unit ...
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The invention discloses a uniform control method for a rectifier and an inverter. The control method comprises an instantaneous value control module, a harmonic control module and a phase synchronization module. According to the difference of input signals, the instantaneous value control module is used for completing the direct-current bus voltage control of the rectifier and the output voltage control of the inverter respectively, the harmonic control module is used for completing the input current harmonic suppression of the rectifier and the output voltage harmonic suppression of the inverter respectively; and the phase synchronization module is used for completing the control for the input current unit power factor of the amplifier and the synchronization function of the output voltage and synchronization source voltage of the inverter respectively. The uniform control can be applicable for the control of the amplifier and the inverter simultaneously, the sharing of a control program frame and codes is realized, the software development cycle is shortened, and the debugging and maintenance work of program codes are simplified.
Description
technical field [0001] The invention relates to the technical field of rectifier and inverter control, in particular to a unified control method for rectifiers and inverters, that is, a general control loop design method for rectifiers and inverters. Background technique [0002] The control of the traditional three-phase four-wire PWM rectifier generally adopts the double closed-loop control structure of the outer loop of the DC bus voltage and the inner loop of the inductor current. The inner loop control of the inductor current is usually carried out in the dq0 rotating coordinate system. The traditional three-phase four-wire PWM inverter generally adopts three basic loop control loops: voltage effective value loop, voltage instantaneous value loop and inductor current instantaneous value loop. The single-phase independent control mode of the abc static coordinate system. In a back-to-back system consisting of three-phase four-wire PWM rectifiers and inverters, such as a...
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IPC IPC(8): H02M7/217H02M7/537
CPCH02M7/2173H02M7/537
Inventor 徐德鸿施科研王小军
Owner ZHEJIANG UNIV