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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 paper is about measurement of watt loss present in the capacitor banks when connected to the load. The main objective of this paper is to figure out losses such as eddy current loss, problems due to harmonics present in the system because of excess capacitor banks. Several parameters such as harmonics, k-factor and power factor are analyzed with the help of power analyzer. Practical values are...
The increasing penetration of intermittent power generation from renewable energy sources as well as the growing number of non-linear power converters in the electricity grid pose a challenge for securing power quality. In this paper, a control system for a modular, shunt-type Power Conditioning System (PCS) is presented to particularly address voltage and current harmonics and reactive power compensation...
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...
For the structural characteristics of the inverter main circuits usually used in PV grid-connected systems, a novel PV grid-connected power conditioning system(PVPCS) is proposed, in which reactive power compensation and harmonic suppression are integrated. The system can improves not only power quality but also efficiency, and reduces power wasting. The working principle of the system, instantaneous...
This This paper presents a compensating system for the harmonic currents, the reactive power and source neutral conductor current in three-phase four-wire distribution system by using a five-level cascaded H-bridge voltage source inverter (CHB-VSI) based shunt active power filter (SAPF). A controller based on the d-q-0 theory (synchronous reference frame) and in-phase disposition (IPD) modulation...
This paper presents a new variation of the selective harmonic elimination pulse width modulation (SHE-PWM) technique applied to cascaded multilevel converter based STATCOM system. The DC voltage levels of the cascaded H-bridge converter are assumed variables, hence increasing the degrees of freedom in the formulation of the problem. This approach allows additional harmonics to be controlled when compared...
Shunt active power filters (APF) are widely used in power systems to eliminate the current harmonics and to compensate reactive power due to their accurate and fast operation. In this paper the instantaneous power theory is used to extract the harmonic components of system current. Then fixed-band hysteresis current control is explained. Because of fixed-band variable frequency disadvantages, the...
This paper presents shunt active power line conditioners for power quality improvement such as harmonics and reactive power compensation due to non-linear loads. The novel compensation control strategy is based on positive sequence voltage detector with generalized Fryze currents minimization, an approach different from conventional methods; the purpose is to guarantee linearity between the supply...
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...
Due to the presence of large number of reactive power compensators at different voltage levels in a typical industrial network, many combinations of the settings of compensators are possible, all of which are not appropriate in terms of harmonic conditions in the network. Thus, it is rather hard for an operator to make an optimal decision how to operate and predict all of the potentially dangerous...
This work presents compensation algorithm schemes used in power quality conditioners applied to three-phase four-wire systems, allowing harmonic current suppression and reactive power compensation which results in an effective power factor correction. The strategies used to extract the three-phase compensation currents are based on the synchronous reference frame method. Although this method is itself...
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...
Poor power quality of single-phase electric railway systems with industrial three-phase power supply will result in extra line losses, under-voltage at the terminal of contact wire, and unbalanced current of utility grid, etc. To address all of the above problems, a co-phase power supply system is adopted and an active power compensator (APC) based on electronic power converter is proposed in this...
A new approach for harmonic current and reactive power compensation in single phase systems are proposed and its efficiency is evaluated. A control method for a hybrid series active power filter is demonstrated. The results clearly show the efficiency of this method in single phase configurations. One important advantage of the presented control method is its fast speed response to load changes, less...
In this paper, a DSTATCOM (Distribution Static Compensator) using three single-phase VSCs (voltage source converters) integrated with three single phase transformers is employed for the power quality improvement in three-phase fourwire distribution system. Three single phase transformers are used for isolation and connection of H-bridge VSCs. This DSTATCOM provides the voltage regulation or power...
The purpose of this paper is to introduce an economic cooperative agent based optimization algorithm oriented on Ant Colony System (ACS), which is sensitive to load profile changes, for controlled and optimized switching of Static VAR Compensators (SVCs). Compared to other available heuristics ACS offers several advantages including distributed computation, positive feedback, and robustness. Optimization...
The power quality in distribution systems is affected by the pollution introduced by the customers. One way to improve the power quality is using a DSTATCOM to compensate reactive power and harmonics. The use of multilevel inverters in medium voltage applications is a good solution. In particular, the cascaded asymmetric multilevel converter (CAMC) appears as a very attractive alternative among the...
In this paper, an active power line conditioner is conceived for harmonic and reactive power compensation in the single-phase to three-phase systems. The proposed system is divided into two classes: a) parallel active power filter at the single-phase grid side; and b) series active power filter at the three-phase load side. Compared with conventional five-leg single-phase to three-phase converter,...
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