A kind of SVG control method and system
A control system and control method technology, applied in reactive power compensation, reactive power adjustment/elimination/compensation, etc., can solve problems such as unfavorable engineering practices, poor steady-state performance of control methods, and poor SVG performance.
Active Publication Date: 2018-07-24
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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[0003] At present, the control method adopted by the SVG control system is mainly indirect control, and the most widely used in indirect control is active-reactive power feedback decoupling control, but the control algorithm design of this control method is relatively complicated, and this method is used in When there is an error between SVG and the mathematical model, the performance of SVG will become poor or even unstable, that is, the steady-state performance of this control method is poor, which is not conducive to engineering practice
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[0056] The core of the present invention is to provide a kind of SVG control method and system, adopt PI control mode to obtain the driving signal of each cascade module, the algorithm design is simple, the calculation amount is small; and can guarantee the driving signal obtained and the expected driving signal Similarly, the high control stability of the control system ensures the steady-state performance of SVG, which is beneficial to engineering practice.
[0057] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by person...
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The invention discloses an SVG control method and system. The SVG includes a control system and 3N cascading modules, and each phase power supply is connected to N cascading modules respectively, including obtaining the DC voltage of each cascading module and performing the first step on it. First PI control to obtain the corrected phase angle corresponding to each cascaded module; obtain the single-phase average DC voltage of 3N cascaded modules and perform second PI control on it to obtain the modulation wave amplitude of the control system; calculate the control system The reactive power is controlled by the third PI to obtain the phase shift angle of the control system; the three-phase voltage of SVG is obtained and phase-locked to control it to obtain the synchronous phase of the control system; according to the modulation wave amplitude and phase shift angle , synchronous phase and corrected phase angle corresponding to each cascade module to obtain 3N modulated wave signals corresponding to each cascade module and perform pulse width modulation on it to obtain 3N drivers for driving and controlling the corresponding cascade module Signal. The invention adopts PI control mode, the algorithm design is simple, and the control stability is high.
Description
technical field [0001] The present invention relates to the technical field of reactive power compensation, in particular to an SVG control method and system. Background technique [0002] SVG (Static Var Generator, Static Var Generator) is a device that uses a self-commutating semiconductor bridge circuit to perform dynamic reactive power compensation. SVG is powered by a three-phase power supply, including the control system and connected to each phase power supply. Multiple semiconductor bridge circuits on the control system can adjust the phase and amplitude of the output voltage of the AC side of the semiconductor bridge circuit through the drive signal output by the control system, so that the semiconductor bridge circuit can absorb or send out reactive current that meets the requirements. Realize the function of dynamic reactive power compensation. [0003] At present, the control method adopted by the SVG control system is mainly indirect control, and the most widel...
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IPC IPC(8): H02J3/18
CPCY02E40/30
Inventor 尚敬张志学陈江黄超南永辉刘华东黄子昊梅文庆陈涛
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST