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Flexible Alternate Current Transmission System (FACTS) is an important way to improve the utilization of the electrical equipments and system voltage stability. The paper mainly controls the voltage stability in adjacent areas of power system, analyzes the characteristics of different voltage stability problems, and consider the characteristics and control laws of medium and long-term voltage stability...
In recent years, with the rapid development of electric vehicle technology, countries all over the world pay more attention to the standardized problem. The paper expounds the development present situation of foreign and domestic electric vehicle standards and presents the focus question of electric vehicles standards. Through the contrast analysis, the difference between domestic electric vehicle...
Voltage stability means much to power system. Users can not be satisfied with low voltage for their requests of power quality. In addition, if there are factors which can cause voltage collapse, measures should be taken as soon as possible, in case of big damages to power system. The voltage may be instable when there are many induction motors, so researching relationships between induction motors...
This paper analyzes the characteristics and difficulties of electric vehicles charging load forecast, and a method of electric vehicle (EV) charging load forecasting based on the number of vehicles is proposed. This method is applicable to the early planning of EV charging infrastructure, which calculates concentration load and dispersion load according to EV charging modes. Finally, a case is given,...
Simulation accuracy has great effects on power system analysis and control. In this paper, in order to analyze the power system real-time digital simulation error, prony algorithm is used to extract the features of signal. Based on the analysis results of this algorithm, residual similar index was used to characterize the global error of simulation, and then frequency, damping and amplitude similar...
The method, complex torque coefficient approach, which is used to analyze the sub synchronous oscillation (SSO) problems with the help of PSCAD/EMTDC are recommended. While how to achieve the complex torque coefficient approach by time-domain simulation method effectively has not been specified. With the simulation study of different systems like HVDC system, AC system with series compensation device,...
The compensation strategy of the dynamic voltage restorer (DVR) has significant impact on the compensation result. A new analysis method which is based on pre-sag load voltage is proposed in the paper. The new method chooses the pre-sag load voltage phasor as the reference phasor and put the centre of the limit compensation voltage circle at the terminal of the system voltage phasor. It not only has...
Three single-phase H-bridge DVR is a kind of dynamic voltage restorer (DVR) which is used very widely. The traditional analysis method of compensation strategy has some shortcomings so that it is not suitable for this kind of DVR. A new analysis method which could overcome the shortcomings of the tradition method is proposed in the paper. The new method not only has definite physical concept but also...
Based on the waveform characteristic of virtual value by dq conversion, Wavelet Analysis and FFT, seven types of power quality disturbances are layered-recognized. Firstly, according to the size of voltage virtual value, the disturbances will be divided into two types, the first type includes voltage sag, swell and interruption. The second type includes the rest of the disturbances. Secondly, wavelet...
Theoretical and simulated analysis on the injection circuit parameters of the Controllable Custom Power Quality Disturbance-Generator which is designed as differentiation cascade type has been done. The topology has three modules: fundamental-frequency module, high-frequency module and rectifier module. The theoretical analysis results have shown that the regulation precision of output of the fundamental-frequency...
A novel stages compensation and control strategy suitable for a series power-quality regulator (SPQR) based on a voltage-source converter (VSC) inverter is proposed in which steady operation stage, overrun operation stage, and recovery operation stage are included. The presag voltage compensation, minimum energy compensation, and maximum energy compensation strategies are adopted to the three stages,...
This paper carries out an adaptive phase-shifting controller based on the online prony identification for the thyristor controlled series compensation (TCSC) in interconnected grid. Because the frequency deviation of power swings, the controller with fixed parameters isn't robust. So the prony algorithm is present to identify the frequency of inter-area oscillation, then the parameters of controller...
This paper studies the strategy of thyristor controlled series compensation (TCSC) to damp power swing in interconnected systems. In interconnected network, TCSC must operate in response to inter-area main swing model, and its capacitive impedance must switch to the largest when the rotated speed deviation between equivalent centers of inertia is positive, and to the smallest when negative, so as...
By analyzing the methods of harmonic and reactive current detection based on the instantaneous reactive power theory, some improvements for the detection method of constructing two-phase in single-phase circuit is presented, and the key algorithm to obtain the important current components is presented too. By studying on the method of active current separation, a new detecting method for harmonic...
The instantaneous reactive power theory is widely used in the detection of harmonic and reactive current in three-phase circuit, and can also be used in single-phase circuit detection. This paper deducts the detection method in single-phase circuit by constructing two-phase system based on the instantaneous reactive power theory. An improved algorithm to obtain the key circuit components is presented...
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