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2009 Asia-Pacific power and Energy Engineering Conference, APPEEC 2009

作者： Song, Xiang Jun, Wen Hui-Yuan, Zhang Xiang-Ning, Xiao School of Electrical and Electronic Engineering North China Electric Power University Beijing China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control North China Electric Power University Ministry of Education Beijing 102206 China

ISBN: (纸本)9781424424870

A dynamic mathematical model - Johns arc model which could be used to simulate the dynamic secondary arc in the process of single-phase auto-reclosure after transient single-phase faults is presented and actualized in PSCAD/EMTDC. This model is used in the digital faults simulations of the first Ultra high voltage (UHV) transmission line of 1000kv class in China-the Jindongnan-Jingmen UHV single circuit transmission project under construction, the outcomes and influences of several known important factors, such as wind, manner of shunt compensation and other meteorological and geographical factors including temperature, humility, altitude and so on are discussed. According to the discussion, the preconcert reclosure interval of 1s is proved to be proper. © 2009 IEEE.

关键词： Electric lines

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Available Transfer Capability Evaluation Based on Sensitivity Analysis

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IFAC Proceedings Volumes 2009年第9期42卷 62-67页

作者： Yajing Gao Gengyin Li Ming Zhou Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing 102206 P.R. China (Tel: +86 10 80798551)

According to the definition of Available Transfer Capability by North America Electric Reliability Council (NERC), we know that ATC not only depends on the topology of power network but also on the parameters of components. So a series of adequacy indices are proposed to evaluate ATC. Through thorough analyses on these indices, the sensitivities of components parameters to these adequacy indices are deduced. The impact of components parameters’ small variations on ATC can be reflected by these sensitivities, the importance degree of each component can be embodied. Furthermore, by sensitivity analysis we can effectively identify ATC bottlenecks and get important guide information for operation and planning. The algorithm based on MATlab 6.5 is developed. The correctness and effectiveness of the proposed sensitivity analysis method are verified using IEEE-RTS79 test system.

关键词： Available Transfer Capability adequacy indices sensitivity analysis

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Multi objectives operation of cascade inverter-based voltage quality compensator with PWM rectifier supply

Multi objectives operation of cascade inverter-based voltage...

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International Conference on power Electronics and Drive systems (PEDS)

作者： Renzhong Shan Zhongdong Yin Xiangning Xiao Yajing Di Ke Li Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel main circuit topology of voltage quality compensator (VQC) is proposed in this paper, composed of PWM rectifier and cascade H-bridges inverter. The three phase inverter is decoupling controlled. PWM rectifier is adopted to maintain the dc-bus voltage stably and provide or absorb real power. The inverter is controlled by carrier phase shifting with FPGA. The simulation model is set up on the platform of PSCAD/EMTDC, the voltage sag, swell and harmonic compensation is researched by theoretical and simulation. Finally, the simulation results show that the proposed main circuit topology and control strategy is feasible and efficient for multi objectives voltage quality compensation.

关键词： Pulse width modulation inverters Rectifiers Circuit simulation Circuit topology Pulse width modulation Voltage fluctuations Field programmable gate arrays PSCAD EMTDC Voltage control

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Enhancement voltage stability of wind farm access to power grid by novel SVC

Enhancement voltage stability of wind farm access to power g...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Junjie Zhang Zhongdong Yin Xiangning Xiao Yajing Di Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424427994

This paper studies the voltage stability problems of wind farm access to electric grid. Based on the equivalent circuit of asynchronous machine, it deduces the relationship of wind turbine angular velocity rotation with the induction generator terminal voltage. Aiming at wind power for 10 kV distribution grid, a novel SVC is proposed to replace the fixed capacitors compensating devices. The reactive power can be detected based on the instantaneous reactive power theory and with this method the reactive power compensation is fast and continuous. The voltage level of wind farm access system is stable with a voltage feedback control strategy. The new SVC winding structure can achieve a multi-pulse, injecting the system small harmonic current component. Research results show that a corresponding control strategy of the novel SVC compensation device can be very good to improve voltage stability of wind farm access to the grid.

关键词： Voltage power system stability Wind farms power grids Static VAr compensators Reactive power Circuit stability Equivalent circuits Wind turbines Angular velocity

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A Novel dynamic Var Compensator

A Novel Dynamic Var Compensator

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International Conference on Energy and Environment Technology (ICEET)

作者： Chengxin Dai Zhongdong Yin Renzhong Shan Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

This paper proposed a novel dynamic reactive power compensation circuit topology which is applicable to low voltage distribution system. It described the composition, features, and working principle of dynamic reactive power compensation system. Open-loop SPWM control strategy is applied for the inverter, by adjusting the inverter output voltage to dynamically regulate the absorption or emission of reactive power by SVC, zero reactive power compensation of the system can be achieved. With the combination of fixed compensation capacitor the capacity of the inverter can be smaller when it compensates the reactive power dynamically, it can improve the power factor and voltage level fast, efficiently and reliably. It overcomes the switching oscillation and the shortcomings of inadequate compensation, at the same time, reduce power loss and improve the voltage quality.

关键词： Reactive power Inverters Reactive power control Circuit topology Low voltage Open loop systems Voltage control control systems Absorption Static VAr compensators

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A Novel Hybrid dynamic Reactive power Compensator

A Novel Hybrid Dynamic Reactive Power Compensator

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Renzhong Shan Zhongdong Yin Xiangning Xiao Chengxing Dai Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel dynamic reactive power compensation circuit topology suitable for low voltage distribution system was proposed. The efficient compensation of unbalanced load could be realized by the structure of three-phase four-leg inverter circuit. The sinusoidal pulse width modulation (SPWM) control of inverter could ensure the low distortion of voltage and current. Besides, by the regulation of the inverter's output voltage, the compensation reactive power could be dynamically regulated and the aim of system's zero reactive power compensation could be realized. Combined with fixed capacitor compensator, small capacity of inverter is required to compensate dynamic reactive power. The novel dynamic static var compensator (SVC) could improve the system's power factor and voltage stability. Finally, simulations are carried on the platform of PSCAD/EMTDC. The results show that the proposed control strategy is feasible and efficient.

关键词： Reactive power Pulse width modulation inverters Low voltage Static VAr compensators Circuit topology Pulse inverters Voltage control Capacitors Stability PSCAD

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The AC-DC hybrid transmission system ATC calculation based on continuation power flow

The AC-DC hybrid transmission system ATC calculation based o...

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International Conference on Sustainable power Generation and Supply, SUPERGEN

作者： Ning Ji Yajing Gao Ming Zhou Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

ISBN: (纸本)9781424449347

Expanding the extra high voltage AC/DC hybrid transmission system and improving the transfer capability of the network are the primary tasks of the power network in China. With the increasing expansion of AC/DC transmission system scale, the super large scale hybrid network has taken shape in china, then the systematic research on ATC calculation model and algorithm for AC/DC systems is urgently needed. A new ATC computation model for AC/DC hybrid transmission system is proposed in this paper. In this model the effect of multiterminal DC system can be considered. CPF algorithm is presented to solve this model, then the ATC value of AC/DC hybrid transmission system can be gained. The algorithm based on MATlab6.5 is developed. IEEE 14-bus test system is used to verify the presented approach.

关键词： Load flow Mathematical model power system reliability power system modeling power system interconnection Hybrid power systems Computational modeling Voltage Large-scale systems Computer languages

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A Novel Low Harmonic dynamic Static Var Compensator Resaerch

A Novel Low Harmonic Dynamic Static Var Compensator Resaerch

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Renzhong Shan Zhongdong Yin Xiangning Xiao Key Laboratory of Power System Protection and Dynamic Monitoring and Control under Ministry of Education North China Electric Power University Beijing China 102206

ISBN: (纸本)9781424427994

A novel SVC topology is proposed in this paper, firstly a multi-winding transformer is adopt to realize 12 ripple, secondly the 5th harmonic filter on system bus as the fundamental reactive power compensation, and control thyristor controlled reactor (TCR) to realize inflow system reactive power, thirdly modularization design is adopted, according to the compensation reactive power only one TCR module is phase controlled. Finally, the experimental result shows that the novel TCR without an additional filter has the advantages of low harmonic, good static and dynamic performance, small volume and etc, compared to traditional TCR.

关键词： Reactive power Var compensation Thyristor controlled reactor Harmonic current 12 ripples Modularization

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A protection scheme for phase-to-phase faults based on spectrum characteristic of fault-generated high-frequency transient signals

A protection scheme for phase-to-phase faults based on spect...

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IEEE General Meeting power& Energy Society

作者： S. F. Huang X. G. Wang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

When a fault occurs on a transmission line, fault-generated high-frequency signals contains a lot of information about fault. This paper proposes a protection scheme for phase-to-phase fault in transmission line based on spectrum characteristic of fault-generated high-frequency signals. The difference of fundamental natural frequencies in both ends of transmission line is used to determine whether a fault is internal or external. The scheme can reduce trip time if the fault is an internal fault and does not misoperate if the fault is external. It also can identify chose-up faults. The scheme performance was proven using power system Computer Aided Design (PSCAD) in 500-kV power system considering critical fault cases.

关键词： power system transients power transmission lines Frequency domain analysis Fault diagnosis power system protection PSCAD Voltage Fault detection Frequency measurement Bandwidth

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dynamic state estimator with Phasor measurements for power system electromechanical transient process

Dynamic state estimator with Phasor measurements for power s...

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IEEE General Meeting power& Energy Society

作者： Tianshu Bi Xiaohui Qin Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

Wide area measurement system (WAMS) has been widely used in power system dynamic monitoring and control, such as low frequency identification and control, stability assessment and preventive control, etc. However, as a measurement tool, phasor measurement unit (PMU) has the measurement error and bad data unavoidably. If the raw measurements are applied in power system analysis and control directly, the unexpected consequence might be resulted in. Aiming at this problem, a novel dynamic state estimator for generator state variables is proposed in this paper. The corresponding mathematical model is given in detail. Bad data detection and elimination approach is presented as well. The simulation results show that the proposed method can provide the estimated trajectories of the generators in real-time, which eliminates the impact of measurement error and bad data and could give the backbone for WAMS based dynamic applications and real-time control.

关键词： power system dynamics power system transients State estimation power measurement power system measurements control systems power system stability Wide area measurements Phasor measurement units Measurement errors

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