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A methodology for vulnerability assessment of backup protection under cascading failures

A methodology for vulnerability assessment of backup protect...

引用

International Conference on Critical Infrastructures, CRIS

作者： W. H. Yang T. S. Bi S. F. Huang A. C. Xue Q. X. Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

To avoid undesired operation of backup protection caused by load encroachment under cascading failures, the methodology for vulnerability assessment of backup protection is studied. In this paper, the vulnerability assessment of backup protections is formulated as a mixed integer nonlinear programming problem, which is solved by the binary particle swarm optimization approach. The measurement index for assessing the vulnerability of backup protection is given as well. The simulation results on New England 39-bus system demonstrate that the proposed method can effectively assess the vulnerability of backup protection under cascading failures.

关键词： power system protection power system faults Indexes Simulation Particle swarm optimization Load flow

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A New Algorithm of Topology Analysis Based on PMU information

A New Algorithm of Topology Analysis Based on PMU informatio...

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International Conference on Critical Infrastructures, CRIS

作者： Cheng Qian Zengping Wang Jinfang Zhang 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)9781424480807

With the widely installation of Phasor Measurement Units (PMUs) in power system and the increasing requirement of the real-time monitoring and control, a novel power system topology analysis algorithm is proposed with high precise information from PMUs to improve the performance of current network topology analysis. First of all, a method of identifying switch status is established to correct the state mistake of circuit breakers (CB) relying on the analog data acquired by PMUs. Subsequently, a topology analysis in substation combined with the PMUs information (including the digital data of CBs state and the phasor of voltage and current) is advanced in this paper. And then an efficient topology analysis algorithm introduces into topology search process using Cotree-to-Bus structure array. Finally, simulation results based on the PSCAD and MATLAB software have validated the efficiency and accuracy of the novel method introduced in this paper.

关键词： Switches Network topology Topology Algorithm design and analysis Phasor measurement units Arrays power systems

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A novel SSR-damping scheme based on a single-phase SSSC

A novel SSR-damping scheme based on a single-phase SSSC

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International Conference on power Electronic Drives and Energy systems for Industrial Growth

作者： Xiangning Xiao Benfeng Gao Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring And Control under Ministry of Education North China Electric Power University Beijing China

A three-phase unbalanced system will reduce mechanical and electrical energy interaction and thus, to some extent, inhibit subsynchronous resonance (SSR). Based on this principle, a compensation method using a single-phase static synchronous series compensator (SSSC) is proposed. In this method, only one phase employs an SSSC to replace part of the fixed series capacitor, while the other two phases have fixed series compensation (FSC). By controlling the SSSC, the three-phase reactance at power frequency is balanced, while at sub-synchronous frequencies, the system is unbalanced and thus inhibits SSO. A single-phase SSSC model based on a cascaded H bridge topology is built for time-domain simulations. The damping effect and the minimum degree of compensation required from the SSSC are analyzed by transient simulations. Simulation results show the method can effectively restrain SSO and has little effect on the three-phase voltage unbalance factor. Compared with employing SSSC in all three phases, this method is more economical.

关键词： Damping power capacitors Torque Generators Capacitance Time domain analysis

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Electromagnetic and electromechanical transient hybrid real-time simulation technology based on RTDS used in subsynchronous resonance research

Electromagnetic and electromechanical transient hybrid real-...

引用

International Conference on power system Technology (powerCON)

作者： Wei Li Xiangning Xiao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

In this paper, power system electromagnetic and electromechanical transient hybrid real-time simulation technology is expounded in details, which has advantages of the electromagnetic transient simulation program and electromechanical one. The more details needed to analyze the dynamic characteristics of power systems are provided by this hybrid simulation technology, and the scale of power system simulated is not limited in the hybrid simulation program. The hybrid simulation program is applied to analyze the power system subsynchronous oscillation problem occurred in a power plant with 4 turbine generators located in the northwestern China. According to the simulation results, it is clear that the stability of generators is threatened by the subsynchronous oscillations caused by capacitor series compensation in the transmission line connecting the power plant and the load center system. In meantime, the effectiveness of the countermeasure is validated simultaneously by the hybrid simulation results.

关键词： Computational modeling Analytical models Load modeling Real time systems Resonant frequency

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Impact of transient response of instrument transformers on phasor measurements

Impact of transient response of instrument transformers on p...

引用

IEEE General Meeting power& Energy Society

作者： Tianshu Bi Hao Liu Xing Zhou Qixun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring & Control under Ministry of Education North China Electric Power University Beijing China

The instrument transformer is the necessary equipment which connects the primary power system and PMU. Therefore, the measurement accuracy of PMU is directly affected by the transfer accuracy and the transient response of instrument transformer. In this paper, the dynamic signal models are abstracted from the phenomena of practical power systems. under such kinds of dynamic signal models, the impact of instrument transformer on PMU is analyzed in detail, especially for the saturation problem of the current transformer and the ferromagnetic resonance and transient response of capacitor voltage transformer. Based on the analysis, the suggestions for the evaluation criteria of PMU dynamic behavior can be provided. Moreover, the principles of choosing instrument transformers in the wide-area measurement systems are suggested as well.

关键词： power system dynamics Frequency modulation Phasor measurement units Oscillators Circuit faults Current transformers

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Notice of Retraction: Study on dynamic Peak power Compensator

Notice of Retraction: Study on Dynamic Peak Power Compensato...

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

作者： Ke Li Zhongdong Yin Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

This article has been retracted by the publisher.

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Parameters optimization of HVDC control system based on Simplex Algorithm in RTDS

Parameters optimization of HVDC control system based on Simp...

引用

International Conference on Critical Infrastructures, CRIS

作者： Zhuo Jia Chengyong Zhao 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)9781424480807

The performance of HVDC system depends on the parameters of control system, and usually PI controllers have been used to adjust system to fulfill desired objectives. However, the optimization methods for PI controllers' parameters of HVDC system are very few up to now. And when the optimization task comes to RTDS, it becomes more complex. This paper introduces the Simplex Algorithm and its application in real time simulation (RTDS). The system objective functions are adopted to optimize the PI parameters of constant current (CC) control at the rectifier and the extinction-angle control at the inverter for Three Gorges-Shanghai ±500 kV DC Transmission Project on the basis of the control strategy. After the optimization process was finished, the performance of the PI controller with the optimized parameters was compared with that of the PI controller with the initial parameters. The step responses of those two PI controllers were presented by figures. And it shows that the controller with the optimized parameters has strong robustness.

关键词： HVDC transmission Optimization Rectifiers Inverters control systems Voltage control Robustness

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Analysis of converter topological structure for direct-drive wind power system with PMSG

Analysis of converter topological structure for direct-drive...

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International Conference on power system Technology (powerCON)

作者： Zheng Chen Xiangning Xiao Haitao Wang Mengwei Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and control under Ministry of Education North China Electric Power University Beijing China

Wind energy has drawn worldwide attention. Because of simple structure, high efficiency, stable operation and other inherent advantages, variable speed constant frequency (VSCF) direct-drive wind power generation system using permanent magnetic synchronous generator(PMSG) is the development trend and one of the focuses of wind power generation system, on which this paper researches through its converter's topological. To be the interface between PMSG and the grid, typical converter topology structure of direct-driven wind power system with PMSG are analyzed, including the diode rectifier + DC to DC converter + inverter, and the back to back double PWM converter. The topological characteristics and applications of some high-voltage, high-power converters are introduced in detail, including Diode-clamped multi-level converter, Cascaded H-bridge multilevel converter and Flyingcapacitor multilevel converter. Their implementations, working principles, advantages and disadvantages are discussed and compared. Judging from the current situation, for the advantages of low-cost and simple control strategy, diodeclamped three-level PWM converter is the hot spot of current converting technique study for direct-driven wind power system.

关键词： Wind power generation Topology Generators Rectifiers Pulse width modulation converters Reactive power

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ATC determination for the AC/DC transmission systems using modified CPF method

ATC determination for the AC/DC transmission systems using m...

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International Conference on Critical Infrastructures, CRIS

作者： Zhongjie Chen 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

With the expansion of the power systems, DC power transmission has been increasingly applied in interconnection of grids. The determination of Available Transfer Capability (ATC) for the AC/DC transmission systems is significant to the system planning and operation. So far, most studies have been focused on ATC determination for AC transmission systems, few are on the AC/DC system ATC determination. In this paper, the ATC determination model for the AC/DC systems is proposed. Multi-terminal DC (MTDC) system is considered in ATC computation model. Conventionally, the power injection variations are determined by load variations and generation dispatch, both of them are nonlinear. To model these nonlinear variations, an alternate iterative continuation power flow (CPF) method with multiple load variations and generation economic dispatch patterns is presented to solve the proposed model. The MTDC system configurations, the converter control strategies and the transformer's tap adjustment strategies are incorporated to this modified CPF algorithm. The modified IEEE 30-bus test system is used to verify the presented approach.

关键词： Equations

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Available Transfer Capability assessment of AC/DC transmission system

Available Transfer Capability assessment of AC/DC transmissi...

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International Conference on power system Technology (powerCON)

作者： Yajing Gao Jin Yang 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 Baoding China

With the increasing expansion of AC/DC transmission system scale, the research on Available Transfer Capability (ATC) for AC/DC transmission systems has important academic and practical significances to AC/DC transmission system planning, operation and reliability evaluation. Most of the existing ATC calculation methods are mainly based on deterministic techniques and suitable for AC transmission system. In practical power systems, there are large amount of uncertainties which can effect the operation of AC/DC transmission system, and power system is dynamic and time-varying. A novel approach is proposed to analyze relevant features of ATC and calculate ATC based on sequential Monte Carlo-Frequency and Duration (FD) considering uncertainties and time variation of AC/DC transmission systems. The algorithm MATLAB6.5 is developed. Modified IEEE-14 node test system is used to verify the presented approach.

关键词： Artificial neural networks Maintenance engineering

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