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As a compromise between economy and good performance, this paper adopts the combined system using active power filter (APF) and static var compensator (SVC) to compensate reactive power and harmonic currents simultaneously. The SVC is constructed by fixed capacitor (FC) and thyristor controlled reactor (TCR), and the APF is constructed by a voltage source converter and its filter reactor. SVC acts...
To the requirements of the detection of harmonics and reactive currents of active power filter (APF), two detection methods of single-phase circuit are studied and the two detecting schematics are also given. The former is the detection method based on the character of triangle function and some improvements are done; The latter is the detection method based on the theory of adaptive linear neural...
Three-level NPC inverter has been put into practical use for years especially in high voltage high power grid. This paper researches three-level active power filters(APF). In this paper the mathematical model in d-q coordinates is presented for 3-phase 3-wire APFs. The dead-beat control scheme is obtained by using the state equations. Canceling the delay of one sampling period and providing the predictive...
This paper presents a new method for harmonic and reactive power compensation with an artificial neural network(ANN) controller and a new control algorithm for active power filter (APF) to eliminate harmonics and compensate the reactive power of three-phase thyristor bridge rectifier. The artificial neural network (ANN) current controller is adapted to active power filter (APF) and the current controller...
The procedure for calculating controller parameters of the APFs implemented into a multibus industrial power system for harmonic voltage mitigation is presented. The node voltage detection control strategy is applied and the basic controller parameters are found under the condition that demanded THD factors at the buses where the APFs are placed will be obtained. A cooperative control of several APFs...
To real time detect the positive sequence of fundamental waveform is key technologies for power quality compensating mechanism. The three-phase positive sequence detecting method without phase lock loop (PLL) based on the dq0 coordinate transformation was put forward in this paper. To design control system of series voltage compensating mechanism with the method, the equipment can well achieve wave...
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