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检索条件"机构=Laboratory of Power System Protection and Dynamic Security Monitoring and Control"

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A Novel Method of Substation Configuration Based on the Virtual Impedance

A Novel Method of Substation Configuration Based on the Virt...

引用

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

作者： Jinfang Zhang Zengping Wang Yagang Zhang Jing Ma Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control of Ministry of Education North China Electric Power University Beijing China

Substation configuration is a vital part of the power system network topology, and its implementation has taken most of the total time of network topology analysis. The improvement of the network topology efficiency focuses on the faster and more accurate substation configuration based on the distributed modeling formation, which can be finished in parallel way in order to reduce the time consumed. Based on the analysis of the common characteristic of adjacent matrix and node admittance matrix and impedance matrix, a new method of original and tracking topology analysis in the substation has been proposed in this paper, which uses the addition of the virtual switch impedances and the virtual ground branches. The directional treatment to the original adjacent matrix is avoided in this new method. According to the characteristic of node impedance matrix, the work for substation configuration has been realized. Finally, the examples have validated the function of the new method in analyzing the original topology and tracking the variation in switch status. Compared to other methods based on adjacent matrix, this method features the easy-to-program property.

关键词： Substations Impedance Network topology Switches Circuit topology power system analysis computing Circuit breakers power system protection power system dynamics power system security

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Simulation and Test Study on Module Based controllable Shunt Reactor

Simulation and Test Study on Module Based Controllable Shunt...

引用

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 paper puts forward a TCR module based new type shunt high voltage reactor, which consists many small capacity thyristor controlled reactor modules and via three-windings transformer connecting to system. The secondary windings of transformer adopt duplex winding structure and each has multi-bank TCR modules being in delta connection. In this topology, the harmonic current injected into the power system is limited remarkably. A 500 kvar/10 kV industrial prototype was developed, and digital simulation based on EMTDC/PSCAD and field test were carried out to verify the characteristics of topology proposed.

关键词： Testing Shunt (electrical) Inductors Topology power system harmonics PSCAD Thyristors Voltage control control systems Joining processes

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Calculation and analysis of capacity credit of wind farms based on Monte-Carlo simulation

Calculation and analysis of capacity credit of wind farms ba...

引用

IEEE General Meeting power& Energy Society

作者： Shuo Zhang 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 China

How to compare the wind power generation and traditional power generation in aspect of capacity is essential of power system expansion. The capacity credit is a convenient and effective way to compare these two different types of power generation. Unfortunately, the definition of capacity credit of wind farms is not clear and generally acknowledged. In this paper, a more clear definition of wind farms' capacity credit based on well-known concept of effective load carrying capability (ELCC) is presented. As well as a calculation method of wind farms' capacity credit based on non-sequential Monte-Carlo simulation, this method considered the failure of transmission lines. The secant method is used at capacity credit calculation process, and the modified direct current optimal power flow method is adopted in power flow calculation. Several different influence factors of capacity credit of wind farms such as the cut-in, cut-out and rated wind speed and the rated capacity of the wind turbine generator, transmission capacity of transmission lines and different integration solutions are analyzed in IEEE-RTS79 case studies.

关键词： Wind farms Reliability power system reliability power generation power transmission lines Monte Carlo methods

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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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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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A New Algorithm of Topology Analysis Based on PMU information

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

引用

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

引用

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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A Novel Wide-area Fault Location Algorithm Based on Fault Model

A Novel Wide-area Fault Location Algorithm Based on Fault Mo...

引用

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

作者： Jing Ma Jin-long Li Zeng-ping Wang Qi-xun Yang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China

A novel wide-area fault location algorithm is proposed in this paper. Fault model is developed in super-imposed network, and then based on network correlation coefficient matrix (NCCM), location function is defined. Finally search technique with adaptive step is used to locate fault branch and fault distance. This method requires few PMUs, avoids modifying node admittance matrix and NCCM. It has less calculation burden, and is easy to achieve. Simulation results based-on PSCAD show that the algorithm can locate fault branch accurately and fault distance precisely in condition of limited measurement points. And fault location results are not affected by fault type or fault resistance.

关键词： Fault location power system modeling Phasor measurement units Transmission line matrix methods power system simulation PSCAD power system reliability power system faults power transmission lines Voltage

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Wind power price regulation considering wind power fluctuation

Wind power price regulation considering wind power fluctuati...

引用

International Conference on Critical Infrastructures, CRIS

作者： Yuhong Zhang 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)9781424480807

Wind power penetration to power systems is increasing rapidly in the recent years due to its environmental benefit, while wind power fluctuation also brings some problems to power system operation which impacts the transmission company's willingness to accept wind power. The most serious conflict influencing wind power development is that the currently adopted price of wind power on-grid does not take this fluctuation or the impact on the system operation into account. Currently, quotas and enforcing access is broadly used in wind power regulation. It is now required that all wind power output should be accepted by the grid, and is rewarded with a guided rate. But with the increase of wind power penetration to power grid, a more effective price regulation to wind power should be set up with wind output uncertainty into account. This paper takes wind farms in different areas in China as the research objects and uses accounting cost analysis approach to calculate wind power costs, which enables the wind farms in different areas to get the same rate of return on investment as that of thermal power plants. These tariffs will be derived as a basic price for the reference by the power grid then. The basic wind power prices are multiplied by a penalty factor which is an innovative as the final prices paid to the wind farms. The penalty factor is related to the accuracy of wind power output. If the accuracy of the wind farm output is higher than that of the regional average one, the penalty factor will be greater than one, so that the really paid wind power price is higher than the base value and the income of the wind farm will be increased, otherwise the earnings will be reduced. To illustrate the problem, an example is given. The use of this penalty factor will eventually help stimulate wind farms to improve the accuracy of wind power output, and improve the stable operation of the systems with large wind power penetration, and promote the sustainable development of wind

关键词： Fluctuations

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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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