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The paper reviews research data of hybrid system of reactive power compensation for Metro electric power substations. Comparative compensation analysis has been made and control system for suggested device has been developed, besides mathematic simulation has been carried out as a result of which power factor of substation has been increased from 0.5 to 0.97–0.99.
This work presents the extended capabilities of a single-phase Pulse Width Modulation (PWM) rectifier to achieve a unity power factor (PF) in the Point of Common Coupling (PCC). It can act as a dynamic var compensator, fixed var compensator and Active Power Filter (APF). To accomplish such tasks a control scheme based in two cascaded loops is used. The outer loop regulates the dc bus voltage and provides...
This paper introduces a versatile control scheme for unidirectional ac–dc boost converters for the purpose of mitigating grid power quality. Since most power factor correction circuits available in the commercial market utilize unidirectional ac–dc boost converter topologies, this is an almost no-cost solution for compensating harmonic current and reactive power in residential applications. Harmonic...
This paper deals with the power flow analysis and control strategy research of unified power quality conditioner (UPQC). A UPQC is a combination of shunt and series active power filter (APF), sharing a common dc link. It can compensate almost all power quality problems such as voltage harmonics, voltage unbalance, voltage flickers, voltage sags, voltage swells, current harmonics, current unbalance,...
The key to guarantee the filter better performance is the accurateness and fast detection of harmonic components of current in power system. The method of reactive current detection and simulation verification based on instantaneous reactive power theory was introduced in this paper. The corresponding design project is given according to the key part in the detection of harmonics. Simulink is applied...
This paper introduced Hexagram converter - a new type of multilevel converter for reactive power compensation and harmonics elimination at Medium-Voltage (MV) grids to improve the power quality. The Hexagram converter is composed of six three-phase two-level Voltage Source Converters (VSCs) interconnected through the inductors, and has the advantages of modular structure with easy construction, even...
This paper describes a novel design concept of power interfaces connecting distributed generators (DG) to the distribution networks. The proposed power interface is able to perform multiple compensating functions besides regulating the real power fed from DG systems. The hardware structure used in the proposed system is similar to the conventional static synchronous compensator (STATCOM), a converter-based...
Active power filter is a reliable and effective technology for harmonic elimination and reactive power compensation. Based on the traditional control strategy for detecting load harmonic current, a new multiple-loop composite control strategy is proposed. The new control strategy has five control loops, which are used for calculating reference voltage signal of the inverter by detecting the load harmonic...
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...
This paper deals with harmonics and reactive power compensation method by grid-connected Photovoltaic (PV) generation system. The experiment is carried out on the proposed single-stage grid-connected PV generation system, and controlled by digital signal processor TMS320F2812. The experimental results include converter operating features either as active power filter or static synchronous compensator...
Based on the analysis on the common methods to handle the Var impact in the system where harmonic exists, a new method is proposed, which can play a profound role in solving Var impact. Through test and practical application, the method deserves promotion in this regard.
To address power quality problems in industrial power systems, a new control scheme for three-phase active power filter is proposed. The control scheme includes two functional modules such as a current harmonic cancellation module and a reactive power compensation module. The current harmonic cancellation module is based on a multiple adaptive feed-forward cancellation algorithm for selective current...
This paper presents detailed analysis to compare and evaluate the performances of four control strategies for extracting the reference currents of shunt active power filter under distorted and unbalanced source and load conditions. The four controllers are based on instantaneous reactive power (p-q), d-q coordinate formulation (d-q), unity power factor (UPF), and perfect harmonic cancellation (PHC)...
To extract a single order harmonic component from single phase voltage or current is a difficult work by the existed instantaneous reactive power theory, which is dominant in the detection of the total harmonic components in three-phase system. A novel detection approach of single order harmonic in single-phase system based on discrete Fourier transformation with smooth moving window is discussed...
The conventional PI controller used in active power filters (APF) requires precise linear mathematical models, which are difficult to obtain and may not give satisfactory performance under parameter variations, load disturbances, etc. In order to address this shortcoming, the novel fuzzy logic controller which is composed of PI controller and fuzzy controller is proposed in this paper. The combined...
A new high capacity comprehensive compensation system based on APF (active power filter) and capacitors is proposed to meet the requirements of harmonic elimination and reactive power compensation in low-voltage distribution power system, where APF is used to cancel the harmonic current and the capacitors are used to compensate the fundamental reactive power. Then the mathematical model of APF is...
This paper presents a shunt active power filter application mainly for source current harmonic elimination. The proposed control method is based on instantaneous reactive power theory. A three-phase voltage source inverter bridge with a dc bus capacitor is used as an APF. It requires measuring the source currents with reduced number of current sensors than the existing methods. The source currents...
This paper presents a technique with instantaneous power theory in order to control APF under non-ideal mains voltage conditions. The quality of the electrical current becomes a major concern. Power electronic equipments draw non-sinusoidal currents from the utility, causing interference with adjacent sensitive loads and limit the utilization of the available electrical supply. In this paper a parallel...
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 a three-phase thyristor bridge rectifier. The artificial neural network (ANN) current controller is adapted to active power filter (APF) and the current...
In order to compensate more reactive power and lower the power level of the active power filter (APF), a hybrid filter system based on a combination of an APF and a thyristor switched capacitor (TSC) is presented. This system combines the good dynamic compensation performance of the APF and higher power level of the TSC. It can eliminate harmonics and compensate the power factor effectively in power...
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