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In the actual power system three-phase voltages are distorted and asymmetric and contain a large number of negative sequence components. Traditional ip-iq method which detect harmonic currents based on instantaneous reactive power theory will be inaccurate, so the positive sequence voltage component of A-phase need be extracted. Improved instantaneous symmetrical components structured a rotary phases...
Aiming at the problems that traditional PI control of DC capacitor voltage has Udc slow dynamic response, the period averaging dynamic model of APF including Vdc is established based on KVL. In order to have a good linearization control effect, the inverse control strategies is presented for three-phase four-leg Active Power Filter, and Aiming at the problem that the APF's dynamic model is a multi...
This paper presents and compares the performance of two controllers namely Fuzzy Logic and Proportional Integral applied to a voltage source inverter/converter operating as an active power filter. The active power filter is operated to compensate harmonics and reactive power generated by the non-linear load and power factor correction simultaneously. This work is performed in order to make an accurate...
Voltage Source Converter (VSC) based HVDC is the most recent HVDC technology with extruded DC cables in small and medium power transmission. VSC-HVDC converters include Insulated Gate Bipolar Transistors (IGBT'S) and operated with high frequency Pulse Width Modulation (PWM) in order to get high speed control of both active and reactive power . With VSC-HVDC there is an addition degree of freedom....
This paper presents the implementations of a new control algorithm for a three-phase shunt active power filter to regulate load terminal voltage, eliminate harmonics, and improve the power factor in systems with an uncontrolled rectifier and an AC controller as the non-linear loads. Different methods are used to control the active power filters. The reference current to be detected from the load current...
This paper deals with a novel configuration of single-phase hybrid active power filter. One of the advantages of the proposed hybrid filter is its adjustable capability to determine voltage rating and current rating of active power stage by selecting appropriate values for its passive filter parameters. Equivalent circuit of proposed hybrid filter has been presented and its filtering characteristic...
This paper presents a control algorithm for improving the performance of a three-phase, four-wired (3P4W) active power filter (APF) under unbalanced and distorted supply voltages. A low pass filter (LPF) is designed to filter the nonsinusoidal supply voltages. The minimal optimal values of active power filter source reference currents are estimated in natural a-b-c reference frame. The proposed method...
This paper presents a new digital signal processor (DSP)-based control method for shunt active power filter (SAF) for three-phase power distribution systems. Compared to conventional analog-based methods, the DSP-based solution provides a flexible and cheaper method to control the SAF. The proposed technique requires fewer current sensors than other solutions which require both the source current...
This paper introduces an active power filter (APF) physical simulator which can be connected with a real time digital simulator (RTDS). According to the actual input/output ports of the RTDS, the interface circuit is designed to combine them to form a closed-loop hybrid real time simulation system. Intelligent power module (IPM) PM200DSA120 is utilized for switching. The control system of the APF...
This paper proposes a novel control method of five-level cascaded inverter for active power filter (APF). This method not only has good filtering performance, but also can keep the capacitor voltages balancing of cascaded multilevel inverter for APF. Simulation and experimental waveforms show that good filtering characteristics and fast responses of the APF are achieved and the each capacitor voltage...
This paper presents a nonlinear control strategy for unified power quality conditioner(UPQC) with better stability and dynamic performance in comparison with PI control and classical decoupled strategy. The analysis is based on the rotating reference frame, and the nonlinear property of UPQC mode is partly dealt through the exact linearization via feedback. The operation of control circuit has been...
Power quality of AC excited variable speed constant frequency (VSCF) generator, which adopts cycloconverter as exciting device, canpsilat meet the need of power system well because of harmonics in the output voltage of cycloconverter. So, how to reduce harmonics is an important problem for VSCF generator. A new active power filter method named synchronous filter method is presented in this paper,...
This paper first established a mathematical model for the split-capacitor three-phase active power filter. Based on the precise mathematical model, it then proposed a control strategy under dq0 coordinate for the DC voltage control of APF, to control the d axis current for DC total voltage stability, to control the q axis current for DC voltage balance. Finally, simulation and experiment result proved...
For UPQC, when source voltage or load current are unbalance or distort, conventional proportional-integral controller on the p-q-r axis can not eliminate steady-state error. To solve this question, an AC equivalent proportional-integral controller in p-q-r axis was proposed. Its principle of eliminating steady-state error to zero was analyzed and a new control strategy by using of it was presented...
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...
The static series compensator (SSC) has shown a significant capability to mitigate voltage dips, which are the most severe problem to sensitive loads. Also, it has been declared that the function of the SSC can be extended to work as a series active filter. This paper proposes a moving average filter (MAF) to detect the fundamental component of the measured voltages and currents (needed to control...
This paper presents a hybrid excitation system, consisting of a capacitor bank with a small-scale active power filter (APF), to regulate the output voltage of the stand-alone induction generator (IG) by controlling its reactive current component and to filter the harmonic currents generated by a non-linear diode rectifier load. Moreover, a deadbeat current control structure for pulse-width modulation...
The bus voltage and branch current detection control strategies of the active power filters used in industrial multibus power systems for harmonic voltage mitigation are analyzed and compared. The multiple harmonic optimization problem for attaining minimum harmonic voltage distortion at selected busbars of the power system is formulated in such a way that its solution yields optimum controller gains...
Non-linear loads, such as diode and thyristor converters, saturated transformers and arc furnaces are typical sources of harmonic currents. Current harmonics have direct and indirect harmful effects on the components connected to the same power supply with harmonic source and on the surrounding device via electric and magnetic fields. Therefore current harmonics must be filtered. The harmonic currents...
Fundamental voltage, current and phase magnitude estimates are required for a wide variety of power system applications. In this paper, a review of a novel nonlinear adaptive filtering algorithm for power system applications is presented. The algorithm has the ability to track and estimate the parameters of a sinusoid in real-time. This makes it suitable for a wide range of applications in electrical...
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