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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...
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...
With development of modern industry, more and more non-linear loads are used in power system, resulting in increasingly severe harmonic pollution. Harmonic becomes main factors affecting power quality. Active power filter, as the most effective method to eliminate harmonic, has been paid more and more attention recently. The current compensation performance of active power filter depends on the controller...
With development of modern industry, more and more non-linear loads are used in power system, resulting in increasingly severe harmonic pollution. Harmonic becomes main factors affecting power quality. Active power filter, as the most effective method to eliminate harmonic, has been paid more and more attention recently. The current compensation performance of active power filter depends on the controller...
Analysis and control for power quality by neural network is a new research field in electrical power system. Rapid and reliable extract the harmonic components determine the overall performance of Active Power Filter (APF). This paper presents a new three-layer feedforward neural network based on error back-propagation algorithm that the training sample without time delay, which can detecting harmonics...
As a powerful optimization algorithm, particle swarm optimization (PSO) has been widely applied to power systems researches. However, because of the unavoidable evaluation time for tentative solutions, most of these applications have been implemented offline. Recently, PSO was realized in real time to identify parameters of a PMSM control systems. In this paper, the real-time PSO (RT-PSO) algorithm...
A method for digital harmonic detection based on re-sampling and feedback theory is proposed, and a digital harmonic detecting system is designed. According to feedback theory, a filter can be designed to take the direct current Ip (Iq), and ip (iq) before a low-pass filter can be re-sampled based on the re-sampling theory. Through this digital system the harmonic currents in a power system can be...
In this paper, a strategy for compensating reactive and harmonic currents produced by non-linear loads, when being connected to the low-voltage side of the power system, is investigated. The loads in the low-voltage network can be classified, from the harmonics point of view, into a harmonic current producing type, a harmonic voltage producing type and a harmonic sensitive type. In spite of its associated...
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