Current Control Strategy of Harmonic Current Injection System for Power Capacitor

In order to avoid excessive noise of power capacitors installed in HVDC converter station, it is necessary to test the noise characteristics of the power capacitors before delivery. Simulating the working condition of power capacitor in HVDC converter station effectively is the target of harmonic power supply researching. To ensure the accurate harmonic current injected into the power capacitor, the harmonic current frequency dividing detection and control strategy is proposed. Adapting the harmonic current detection method based on instantaneous reactive power theory and d-q transformation to single-phase harmonic current injection system, the current amplitude can be tracked timely and exactly by using random harmonic current detection method, so that the Proportional Integral (PI) regulator in d-q synchronous frame used directly to achieve zero-error control. The designed phase detection method can accurately detect the initial phase angle of each harmonic, accordingly calculating the compensation angle of the system. Through the accurate detection and control of the injected harmonic current and the more precise noise test result of power capacitor can be obtained. The simulation and experimental results validate the effectiveness of the current detection and control algorithm proposed in this paper.

[1]  C. Veeresh,et al.  Modeling Of Frequency Domain Control of Shunt Active Power Filter Using MATLAB / Simulink and Power System Blockset , 2013 .

[2]  Chen Yunping.  A NEW ALGORITHM FOR RANDOM HARMONIC CURRENT DETECTION IN THREE PHASE FOUR WIRE SYSTEM , 2005 .

[3]  Alfred Rufer,et al.  Multivariable-PI-Based $dq$ Current Control of Voltage Source Converters With Superior Axis Decoupling Capability , 2011, IEEE Transactions on Industrial Electronics.

[4]  Jinjun Liu,et al.  A new approach for single-phase harmonic current detecting and its application in a hybrid active power filter , 1999, IECON'99. Conference Proceedings. 25th Annual Conference of the IEEE Industrial Electronics Society (Cat. No.99CH37029).

[5]  Zhang Feng.  New Algorithm for Random Harmonic Current Detection in Three Phase Four Wire System , 2007 .

[6]  Sun Yu-zhen.  Establishment and Comparison of a Multiple Capacity Process Transfer Function Standard Form , 2011 .

[7]  Xiaodan Wang,et al.  Closed-Loop Control Method and Implementation of Selective Harmonic Type Active Power Filters , 2009, 2009 Asia-Pacific Power and Energy Engineering Conference.

[8]  Habibur Rehman,et al.  Audible Noise Characteristics of Filter Capacitors Used in HVDC Converter Stations , 2017, IEEE Transactions on Power Delivery.

[9]  M. B. Brennen,et al.  Vector analysis and control of advanced static VAr compensators , 1991 .

[10]  Fu Qiang,et al.  A compensation method of phase-shift error on reactive power measurement , 2012, Proceedings of 2012 International Conference on Measurement, Information and Control.

[11]  S. M. Williams,et al.  Adaptive frequency domain control of PWM switched power line conditioner , 1990 .

[12]  M. D. Cox,et al.  Vibration and audible noise of capacitors subjected to nonsinusoidal waveforms , 1994 .

[13]  Zhou Jing.  AN IMPROVED HARMONIC DETECTING APPROACH BASED ON dq ROTATING COORDINATION TRANSFORMATION , 2000 .