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To fast and effectively detect harmonic current of power system, FBD method is proposed. Compared with method which is based on instantaneous reactive power, FBD method has no complex transformation and transformation, it can be used to detect harmonic current for single-phase, three-phase three-wire and three-phase four-wire system. But FBD method needs a low-pass filter to extract the DC current,...
In this paper, firstly the defects of current algorithms for optimal power filter planning are analyzed, and then a new model, taking both filter costs and network loss as objective functions is proposed. In this model, reactive power compensation is also taken into account. Fast nondominated sorting genetic algorithm (NSGA-II), a new multi-objective genetic algorithm, is used to solve the model....
A brief review to production and the historical development of the active filter technology are introduced. Then the electric current detection method based on the instant reactive power theory is discussed in detail and other electric current detection methods are briefly introduced. It has provided some references to the electric current detection algorithm choice for the design of the active filter.
Generation of reference current constitutes an important part in the control of active power filter, so a new neural identification scheme for the current harmonic extraction is proposed, that is, the fundamental positive and negative sequence components of non-linear load current are extracted directly by adaptive linear neural filter to generate reference current under non-ideal conditions. And...
This paper proposes a novel control strategy for parallel hybrid active power filter (PHAPF) which adopted generalized integrator method to separate specific harmonic. As a result, the active and passive part of PHAPF only compensates their own part of harmonic, avoiding circumfluence between passive part and active part. The passive part only compensates the lower-order harmonic, while the active...
Silicon-controlled current-source rectifiers have been widely applied in industries. However, they cause problems of harmonic currents and voltage notch and result in serious poor power quality of the utility. In this paper, the voltage notch is discussed, and several passive and hybrid solutions to improve the power quality problems caused by the silicon-controlled current-source rectifier are analyzed...
This paper presents a novel modulated power filter compensator (MPFC) scheme for the smart grid stabilization and efficient utilization. The MPFC is controlled by a novel tri-loop dynamic error driven inter coupled modified PID controller. The Matlab digital simulation models of the proposed MPFC scheme has been fully validated for effective power quality (PQ) improvement, voltage stabilization, power...
Rectifier substations in DC electric transportation systems are an important source of harmonic distortion. One of the best compensation actions is to use active power filter due to its adaptation capacity to different load conditions. This paper presents a computational model of DC traction supply systems that allows the presentation of the current distortion in the distribution system under several...
This paper presents an online estimation scheme for the identification of distribution power system impedance parameters. The proposed scheme is based on an invasive current injection method. The scheme benefits from a fast and accurate adoptive notch filter for the extraction of the ambient voltages and currents and also a frequency domain least squares estimator. The former enhances the scheme by...
This paper presents a new type of Hybrid Active Power Filter Device structure, which is based on Double DSP Control with TMS320F2812 as the chip, and combines the active power filter and passive power filters with higher filtering of 5 times, 7 times, etc. In the paper, it introduces the design and realization of the program, and demonstrates the detection and compensation method of the main circuit...
This paper describes the design and performance of a parallel hybrid active power filter integrated into a three-phase diode rectifier with a capacitive load. The hybrid filter is composed by a three-phase LC filter and a small rated active filter based on a three-phase voltage-source PWM converter. The passive filter is designed with focus on characteristic impedance, resonant frequency, influence...
This paper introduces an adaptive harmonic current extraction method for use in Active Power Filters (APFs). The method is capable of detecting a selective order of harmonics. This feature is useful where elimination of certain harmonics is of concern. Moreover, the proposed method can successfully detect and track the variations in the frequency of the signal and extract the time-varying harmonics...
This paper reviews different three-phase harmonic detection techniques. These techniques are to extract voltage/current harmonics for use in grid-connected converters. In particular, this paper compares some of the newly developed three-phase harmonics detection techniques in terms of tracking and extracting time-varying harmonics.
Switching power supply of low voltage and high current based on power electronic technology is widely applied in some industry fields, especially in electroplating, welding and heating. Harmonics in high-power switching supply pollute power system heavily, which must be suppressed effectively. On basis of analyzing harmonic current of switching supply that the output technical specification is 60V/500A,...
Active power filter (APF) has been demonstrated to be an effective way to eliminate power system harmonics. Repetitive controller, which could realize zero steady-state error tracking for all harmonics, is widely used in the controlling of grid-connected converters. This paper proposes a novel repetitive controller in APF system, and introduces the regeneration spectrum and sensitivity function for...
The interaction between the loads and grid impedances can cause deleterious effects on the dynamic model of shunt active power filters (SAPF). These effects may lead to instabilities on the control system, specially if the loads vary randomically. These side effects could be minimized if SAP F employs a robust control strategy which controller gains are adjusted by adaptation. To overcome these side...
Dynamic voltage restorer (DVR) has been demonstrated to be a very effective mechanism to deal with key voltage-quality disturbances. DVR is series connected in the power lines, and the LC filter is also series connected between the converter and grid. Appropriate design of LC output filter system not only could reduce the switching frequency harmonics, but also could maintain fast dynamic for low...
The passive control method that apply the passive power filter (PPF) to suppress negative effect of the Thyristor Switched Capacitor (TSC) is given in this paper, in order to improve zero-crossing voltage detection algorithm of controller of TSC. The study aims to suppress transient surge of reactive power induced by the TSC to a point of common coupling (PCC) of the power distribution system. In...
At present, the One-Cycle Control of Active Power Filter has two serious problems. One is that this method can just compensate the harmonic and reactive power at the same time, which can not be eliminated separately. The other is that the tracking current will be affected and have huge error when the mains voltage appears distortion. So, through the hard work, in this paper, we adopt the method to...
Power Quality means to maintain purely sinusoidal current wave form in phase with a purely sinusoidal voltage wave form. Power quality improvement using traditional compensation methods include many disadvantages like electromagnetic interference, possible resonance, fixed compensation, bulkiness etc. So power system and power electronic engineers need to develop adjustable and dynamic solutions using...
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