Method for controlling series voltage quality compensator
A voltage quality and control method technology, applied in the direction of adjusting electric variables, control/regulation system, AC network voltage adjustment, etc., can solve problems such as instability and cost increase, achieve good performance, reduce system cost, and be simple and easy to implement Effect
Inactive Publication Date: 2009-11-04
XI AN JIAOTONG UNIV
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However, the disadvantage of the same-phase control is that as long as the grid voltage sags, the SVQC must provide active power, so the system must be equipped with a large DC-side energy storage device, which increases the cost
This control method has a simple control system structure and does not need to detect the load impedance angle, which reduces the system cost, but there are potential instability problems
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[0019] refer to figure 1 A series voltage quality compensator 2 is connected between the three-phase power supply 1 and the nonlinear load 3 . The main circuit structure of the series voltage quality compensator 2 mainly includes four parts: a DC side energy storage device 201 , a voltage source PWM converter 202 , an output filter 203 and a coupling transformer 204 . The DC side energy storage device 202 is generally composed of power capacitors connected in series and parallel. The voltage source PWM converter 202 is composed of fully controlled devices such as IGBT, GTO and the like. The output filter 203 is implemented by a filter inductor connected in series on the AC side of the voltage source PWM converter 202 and a parallel LC filter; the selection of the parameters of the LC filter mainly depends on the switching frequency of the voltage source PWM converter, and the LC filter can be The additional damping resistor suppresses vibration, and its parameters require a ...
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The invention relates to the field of power network power quality optimization, and discloses a method for controlling a series voltage quality compensator. The method comprises the following steps: detecting three-phase voltage uS of a power supply, and acquiring three-phase phase omegat of supply voltage through a three-way phase-locked loop respectively; detecting voltage udc at an SVQC direct current side, comparing the udc with a set voltage value udc* of the direct current side through a one-way subtracter, regulating the output through a one-way proportional integral regulator, and using the output of a one-way proportional integrator as a compensation phase shifting angle delta; summarizing the three-phase phase omegat of the supply voltage with the compensation phase shifting angle delta through a three-way summator respectively, and using the result as a three-phase phase reference value alpha of load voltage; setting an amplitude reference value A of the load voltage, inputting the amplitude reference value A of the load voltage and the three-phase phase reference value alpha of the load voltage into a three-way sine-wave generator, and using the output as a load three-phase voltage reference value uL*; and detecting the actual three-phase voltage uL of the load, forming a voltage control closed loop, and tracking load three-phase voltage reference value uL*.
Description
technical field [0001] The invention relates to the field of network power quality optimization, in particular to a control method for a series voltage quality compensator. Background technique [0002] In recent years, with the advancement of science and technology and the continuous technological update of electrical equipment, many automated and digital sensitive loads have been widely used. While these devices actively promote the improvement of production efficiency, they also put forward higher requirements for the voltage quality of the power supply system. Series Voltage Quality Compensator (SVQC for short) is a type of compensation device that has developed rapidly in recent years, and can effectively solve most grid-side voltage quality problems. [0003] In the system structure of the series voltage quality compensator, the main circuit is composed of a DC side energy storage device, a voltage source PWM converter, an output filter and a coupling transformer. SV...
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Inventor 刘进军袁敞黄新明王晓钰王兆安
Owner XI AN JIAOTONG UNIV