A method for suppressing transient current overshoot of three-phase pwm rectifier
A three-phase current, transient current technology, applied in the direction of electrical components, output power conversion devices, etc., can solve the transient current overshoot control of the three-phase PWM rectifier, affect the control performance indicators, and suppress the current overshoot. Obvious effects and other issues, to achieve the effect of easy engineering implementation, simple implementation, and suppression of current overshoot
Inactive Publication Date: 2017-09-15
泰州师范高等专科学校
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Problems solved by technology
For the former, because it is related to the system capacity and component parameter selection, it is not easy to make too many changes; for the latter, by properly adjusting the relevant control parameters of the PI controller, the above-mentioned current overshoot phenomenon will be alleviated to a certain extent, but at the same time It will affect other control performance indicators of the system, and this method has no obvious effect on suppressing current overshoot
[0004] There is no prior art for transient current overshoot control of three-phase PWM rectifiers
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[0020] A method for suppressing transient current overshoot of a three-phase PWM rectifier according to the present invention divides it into several intervals according to the flow direction of the three-phase current on the network side of the PWM rectifier. In the current interval, select the on-off state of the switching device to forcefully suppress the overshoot current within the allowable range.
[0021] Set the current limit as Imax, take figure 1 The current reference direction shown is the positive direction. The PWM rectifier takes the unit power factor (Unit Power Factor, UPF) rectification mode as an example to analyze the principle of the method.
[0022] The three-phase current can be divided into 6 intervals in one cycle, refer to figure 2 .
[0023] 1. Taking |ia|>Imax as an example to analyze the current overshoot suppression method of the AC side of the UPF rectifier in different intervals and the on-off status of each switching device:
[0024] (1) In...
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The invention provides 1. a method for suppressing transient current overshoot of a three-phase PWM rectifier, comprising the following steps: Step 1: according to the flow direction of the three-phase current at the side of the PWM rectifier network, it is divided into 6 intervals, i.e. interval I: ia>0, ib<0, ic>0, II interval: ia>0, ib<0, ic<0, III interval: ia>0, ib>0, ic<0, IV interval: ia <0, ib >0, ic<0, Ⅴ interval: ia <0, ib>0, ic>0 and Ⅵ interval: ia <0, ib<0, ic>0; Step 2: When the current exceeds the limit, according to the three-phase The current interval where the current exists, select the on-off state of the switching device, and forcibly suppress the overshoot current within the allowable range.
Description
technical field [0001] This invention technology belongs to the field of current control of three-phase PWM rectifiers, and is mainly used to solve the problem of transient current overshoot in the process of current control of three-phase PWM rectifiers, such as the problem of current overshoot in the start-up stage of rectification control. Background technique [0002] In the control strategy of the PWM rectifier system, grid-side current control is the key technology to determine the performance of the rectifier. At present, VSR current control technology is mainly divided into two categories, namely indirect current control and direct current control. Among them, due to the closed-loop control strategy, the direct current control has a fast response speed and strong control robustness, and has become the main method especially for the occasions that require high system dynamic performance, such as double closed-loop current control and state feedback control. , Deadbea...
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IPC IPC(8): H02M1/32
Inventor 许胜李元贵曹健付焕森赵小英丁展夏华凤
Owner 泰州师范高等专科学校