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| 1 | A new compensation current real-time computing method for power active filter based on double linear construction algorithm显示文摘Considering the detection principle that “when load current is periodic current, the integral in a cycle for absolute value of load current subtracting fundamental active current is the least”, harmonic current real-time detection methods for power active filter are proposed based on direct computation, simple iterative algorithm and optimal iterative algorithm. According to the direct computation method, the amplitude of the fundamental active current can be accurately calculated when load current is placed in stable state. The simple iterative algorithm and the optimal iterative algorithm provide an idea about judging the state of load current. On the basis of the direct computation method, the simple itera- tive algorithm, the optimal iterative algorithm and precise definition of the basic concepts such as the true amplitude of the fundamental active current when load current is placed in varying state, etc., the double linear construction idea is proposed in which the amplitude of the fundamental active current at the moment of the sample is accurately calculated by using the first linear construction and the condition which disposes the next sample is created by using the second linear construction. On the basis of the double linear con- struction idea, a harmonic current real-time detection method for power active filter is proposed based on the double linear construction algorithm. This method has the char- acteristics of small computing quantity, fine real-time performance, being capable of ac- curately calculating the amplitude of the fundamental active current and so on. | LI Zicheng SUN Yukun | 2006 | Science China(Technological Sciences)2006，49，4： | 8 |
| 2 | Security region based real and reactive power pricing of power system显示文摘This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power systems.In the proposed model,the reactive power production cost is represented as the opportunity cost.The static voltage stability region in the cut set power space(CVSR) and the practical dynamic security region(PDSR) in the injection power space are used to represent the constraints of voltage stability and transient stability,so that the consideration of this kind of constraints in the optimization becomes very easy.In the proposed algorithm,a decoupled optimization and iteration method of active power production cost and reactive power production cost is suggested.According to the K-T optimality conditions,the prices of active power and reactive power,and the different components corresponding to the concerned security constraints are derived.The components of spot prices can reflect the influence of different node power injections on each kind of security constraints,so that through the node price all of the participants in power market can be stimulated to take an active part in maintaining the system security.An illustrative example on the New England 10-genetator 39-bus System is used to demonstrate the proposed method. | YU YiXin1 & WANG YanJun1,2 1 Key Laboratory of Power System Simulation and Control of Ministry of Education,Tianjin University,Tianjin 300072,China 2 College of Mechanical and Electrical Engineering,Agriculture University of Hebei,Baoding 071001,China | 2008 | Science China(Technological Sciences)2008，51，12： | 7 |
| 3 | A New Filter Collaborative State Transition Algorithm for Two-Objective Dynamic Reactive Power Optimization显示文摘Dynamic Reactive Power Optimization(DRPO) is a large-scale, multi-period, and strongly coupled nonlinear mixed-integer programming problem that is difficult to solve directly. First, to handle discrete variables and switching operation constraints, DRPO is formulated as a nonlinear constrained two-objective optimization problem in this paper. The first objective is to minimize the real power loss and the Total Voltage Deviations(TVDs), and the second objective is to minimize incremental system loss. Then a Filter Collaborative State Transition Algorithm(FCSTA) is presented for solving DRPO problems. Two populations corresponding to two different objectives are employed. Moreover, the filter technique is utilized to deal with constraints. Finally, the effectiveness of the proposed method is demonstrated through the results obtained for a 24-hour test on Ward & Hale 6 bus, IEEE 14 bus, and IEEE 30 bus test power systems. To substantiate the effectiveness of the proposed algorithms, the obtained results are compared with different approaches in the literature. | Hongli Zhang Cong Wang Wenhui Fan | 2019 | Tsinghua Science and Technology2019，24，1： | 3 |
| 4 | A voltage support control strategy based on three-port flexible multi-state switch in distribution networks显示文摘Voltage sags in power system may lead to serious problems such as the off-grid of distributed generation and electrical equipment failures.As a novel type of power electronic equipment,a flexible multi-state switch(FMSS)is capable to support the voltage during the grid faults.In this paper,a voltage control strategy to support the voltage in a distribution network is proposed by introducing three-port FMSS.The positive-negative-sequence compensation(PNSC)scheme is adopted to control the active and reactive current.This control scheme eliminates active power oscillations at the port of voltage sags and reduces coupling oscillations of other ports.Based on the characteristics of the voltage support under PNSC scheme,two voltage support strategies are proposed.A proportional-integral controller is introduced to provide the reactive power references,which eliminates the errors when estimating the grid voltage and impedance.A current limiting scheme is adopted to keep the port current in a safe range by adjusting the active and reactive power references.The voltage support strategies in two different voltage sags are simulated,and results show the feasibility and effectiveness of the proposed control strategies. | 彭勃 张国荣 | 2020 | Plasma Science and Technology2020，22，8： | 1 |
| 5 | Research and Design of Inverter Applied in Solar PV Systems Connected to Distribution Grid显示文摘This paper presents the results of research on the application of inverter in the grid connected solar photovoltaics (PV) system. The main content of the article is to control the three-phase grid connected inverter to meet the requirement of controlling the reactive power to zero at a node of the distribution network while maximizing the active power transmitted to the grid. The control circuits are synthesized on the dq coordinate system and verified on the simulation model by Matlab/Simulink. Both simulation and experimental prototype on 5 kW inverter, being connected to low voltage grid, have been built to show the good results and the practical readiness for implementation. | Nguyen Duc Minh Trinh Trong Chuong Bui Van Huy Quach Duc Cuong Bui Dinh Thanh | 2019 | Journal of Electrical Engineering2019，7，1： | 0 |
| 6 | A Genetic Algorithm for Reactive Power Optimizationof Power System显示文摘Tis paper presents a genetic algorithm for reactive power optimization of power system in a more effective and rapid manner, and verifies the results with an IEEE 30-bus test system. | 蔡兴国 刘林强 柳焯 郭冬梅 | 1998 | Journal of Harbin Institute of Technology(New Series)1998，5，2： | 0 |
| 7 | METHODS FOR IMPROVING EQUIDRIVING POWER-FREQUENCY CHARACTERISTICS OF BROADBAND HIGH POWER KLYSTRON显示文摘Two methods for improving the equidriving power-frequency characteristics of broad-band high power klystrons are presented. One is that a comb-line bandpass filter with someattenuation properties is inserted between the TWT driver and the klystron for compensatingthe gain-frequency characteristics of the klystron to get the required equidriving power-frequencycharacteristics. The other is that a reactive element is connected with the input cavity to changeits resonance frequencies f0 and QL, and thus to improve the power-frequency characteristics ofthe klystron. | 赵京君 丁耀根 刘铁山 | 1992 | Journal of Electronics(China)1992，9，2： | 0 |
| 8 | A Method for Distributed Generator Dispatch Strategy in Distribution Network显示文摘Since a load of power system changes continuously,the generation also adjusted for supply-demand balance purpose.If there exist more distributed generators in the distribution network,the dispatch strategy becomes more crucial.The possibility of having numerous controllable microgrids,diesel generator(DG)units and loads for microgrids(MGs)system requires an efficient dispatch strategy in order to balance supply demand for reducing the total cost of the integrated system.In this paper,a method for the dispatch of the distributed generator in distributed power systems has been proposed.The dispatch strategy is such that it keeps a flat voltage profile,reduces the network losses,increases the maximum loading and voltage security margin of the system.The procedure is based on the analysis of continuous power flow.The method is executed on a 34-bus test system.The MATLAB based PSAT packages are used for simulation purpose. | Md.Asaduz-Zaman Md.Habibur Rahaman Md.Selim Reza Md.Mafizul Islam | 2018 | Journal of Electrical Engineering2018，6，5： | 0 |
| 9 | Design to conditioning circuits of dynamic compensation of reactive power in the intelligence voltage controller显示文摘The paper introduces one design idea that making use of SCM to control Real-timely the dynamic compensation of reactive power.Firstly,design one Circuit to Sample the voltage and current,and by these datas we can easily calculate the power factor,and Voltage controller in the microcontroller to determine whether input the compensation capacitance according to the size of power factor,the paper also analyzes the principle of capacitance compensation and calculation method. Dynamic compensation for the entire process is quick and accurate. | Yong-qin WEI,Yin-jing GUO (College of Infor.&Elec.Eng,Shan dong university of science of technology,Qingdao266510,china) | 2010 | Journal of Measurement Science and Instrumentation2010，1，S1： | 0 |
| 10 | Analysis of the Parameters of the Ore RestorationFurnaces for Equal Power on the Shelf-Baking andGraphitized Electrodes显示文摘Results of calculation of the power indicators of the ore restoration arc furnaces with the set power of 10.5 MVA workingon are given as on the self-baking also on the graphitized electrodes. It is established that despite high cost of the graphitizedelectrodes in comparison with the self-baking electrodes, power parameters much more improve. Besides, the natural power factorincreases, melting time decreases and that the most important the furnace turns out compact, convenient for service, building of thegraphitized electrodes is carried out for a small period, and also the number of service personnel is reduced. We propose a newdesign scheme of low-voltage circuit for the arc furnace according to the scheme "a triangle on the electrodes" designed in athree-bifilar version, in which more complete symmetry is gained by means of the crosspieces forming a triangle directly at theelectrode arms. In the proposed scheme, the current-carrying tubes that have different polarity are located on the same arm that leadsto further reduction in low-voltage circuit inductance. The application of this scheme allows for reducing reactive and activeresistances of low-voltage circuits by 2.5-3 times and 15-20%, respectively, as well as for shortening the heat, reducing specificenergy consumption and increasing the installation power factor. | Vladimir Kldiashvili Tamaz Natriashvili Slava Mebonia Aleksandre Shermazanashvili | 2016 | Journal of Energy and Power Engineering2016，10，12： | 0 |
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