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A simple method for measuring complex transfer impedance and admittance of shielded cable in substations

A simple method for measuring complex transfer impedance and...

引用

International Zurich Symposium on Electromagnetic Compatibility (EMC Zurich)

作者： Lei Qi Xiang Cui Xuesong Gu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control underMinistry of Education North China Electric Power University Baoding Hebei China

In substations, shielded cables are widely used to reduce transient electromagnetic interference to the relay and control equipments due to the switch operation. Both the transfer impedance and transfer admittance are quantities for expressing numerically the mechanism that allows the passage of electromagnetic energy across the cable shield. Theoretical models to compute both the quantities often rely on simplifying assumptions. This, together with the fact that the transfer impedance and admittance can vary considerably between cable samples of the same type, means that measurements become necessary. In this paper, based on the transmission line theory we present a simple method to measure the transfer impedance and admittance of shielded cable in magnitude as well as in phase over the frequency range (0.1 MHz-10 MHz) which covers the main interference frequencies in power system. To illustrate this method a coaxial cable with a braided shield has been measured and compared with the existing method. As an application, the proposed method is used to predict the induced voltage and current on the shielded cable due to the switch operation in substation

关键词： Admittance measurement Impedance measurement Cable shielding Substations Switches Electromagnetic measurements power cables Transmission line measurements Frequency power system transients

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Wams Based Flow Transferring Indentification Algorithm and its implementation

Wams Based Flow Transferring Indentification Algorithm and i...

引用

International Conference on power system Technology (powerCON)

作者： H. M. Xu T. S. Bi S. F. Huang 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

When relays trip a faulted line in power system, the flow on the faulted line will be transferred to the other lines. Those lines might be overloaded and then cascading tripped by the backup relays, which worsen the system state and even cause blackout. Generally, these kind of cascading trips are the origins of a lot of well-known blackouts. In this paper, by analyzing the defects of traditional backup protections, a new wide area backup protection scheme based on WAMS is presented to identify flow transferring. A new concept of flow transferring relativity factor (FTRF) is proposed to estimate the flow distribution after flow transferring occurs; and the method of calculating FTRF matrix online is also deduced. The simulation of 10-unit and 39-bus New England network shows that the proposed wide area backup protection scheme can identify flow transferring successfully and hence be superior to the traditional backup protection.

关键词： power system protection power system relaying power system faults power system security Protective relaying Wide area measurements Fault diagnosis power system reliability Bismuth power system measurements

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Computation of power line tower lightning surge impedance using the electromagnetic field method

Computation of power line tower lightning surge impedance us...

引用

International Zurich Symposium on Electromagnetic Compatibility (EMC Zurich)

作者： Changzheng Gao Lin Li Bing Li Zhibin Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control underMinistry of Education North China Electric Power University Baoding Hebei China

The power line tower lightning surge impedance is computed using an electromagnetic field approach. After comparing the results computed by our method and those tested with both a vertical conductor and reduced scale 4-poles model of tower, the method we used is proved to be right and more practical as the soil and the grounding system of the tower can be considered in the method. Using this method, the lightning surge impedance of the full scale UHV tower with grounding system is analyzed and the results show that the lightning surge impedance of a tower on the perfect ground has a little difference with those of an actual tower considering both its grounding system and soil resistivity, and when the soil resistivity is changed, the surge impedance changes slightly. Furthermore, a circuit model of the tower is obtained by vector fitting method based on the results we computed. Using the circuit model, the lightning surge performance of a power transmission line can be analyzed more accurately by EMTP or other methods

关键词： Poles and towers Lightning Surges Impedance Electromagnetic fields power system modeling Soil Grounding Conductivity Circuits

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The short-term electric load forecasting grid model based on MDRBR algorithm

The short-term electric load forecasting grid model based on...

引用

IEEE General Meeting power& Energy society

作者： Ran Li Jing Hua Li He Ming Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding Hebei China

In load forecasting of a bulk power system, the geographical scope of forecasting region is large, the main electrical load effecting factors in sub districts are different greatly. So it is very significance to establish different load forecasting model according to self-feature of each sub district of a large area, by which the forecasting load is closer to the fact load than establishing one model in whole to forecast electrical load. This paper presents a grid model in terms of geographical division for short-term load forecasting in a bulk power system. The subset model in each geographical grid, considering its own historical loads and meteorological conditions, is more effective and could lead to more accurate results. Therefore, every subnet model is established based on the mining default rules on rough sets (MDRBR) algorithm. First, the MDRBR algorithm is discussed, and the constructing process of the multi-layered rule-network of daily load forecasting is then analyzed in detail. Furthermore, the whole process of load forecasting based on the MDRBR algorithm is presented. Finally, an example using actual historical data shows that the grid forecasting model can yield high accurate results, reduce noises effectively, and is efficient in computation and rule searching

关键词： Load forecasting Load modeling Predictive models power system modeling Weather forecasting Meteorology Rough sets Algorithm design and analysis Noise reduction Grid computing

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Reconfiguration of network skeleton based on discrete particle-swarm optimization for black-start restoration

Reconfiguration of network skeleton based on discrete partic...

引用

IEEE General Meeting power& Energy society

作者： yan Liu Xueping Gu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

The black start restoration of a power system after a complete blackout is a very important issue to safety of the power system. The reasonable network reconfiguration strategy is necessary for establishing the main network and restoring loads as soon as possible. A skeleton-network reconfiguration strategy is proposed in this paper. Through determining the skeleton network, the burden of network reconfiguration can be reduced effectively. The reconstructing processes are evaluated by a comprehensive index of network reconfiguration efficiency. Furthermore, discrete particle-swarm optimization is employed in reconstructing network skeleton and several relatively-optimal schemes can be obtained as the guidance of the system restoration. Application to the IEEE 30-bus power system shows that reconfiguration schemes derived from the strategy are effective under uncertain system situations and ensure that the following restoration be successful

关键词： Skeleton power system restoration power system reliability power system faults power system measurements power supplies power measurement Safety Particle swarm optimization power system management

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Operational Mechanism and Characteristic Analysis of Novel Hybrid HVDC system

Operational Mechanism and Characteristic Analysis of Novel H...

引用

International Conference on power system Technology (powerCON)

作者： Guangkai Li Gengyin Li Haifeng Liang Ming Yin Chengyong Zhao Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

Conventional HVDC has the advantages of mature state of art and lower cost and the disadvantages of absorbing large reactive power and the danger of commutation fault. Voltage source converter (VSC) based HVDC (VSC-HVDC) has the advantages of flexible operation and control and the disadvantages of high cost. Combining the advantages of the two kinds of transmissions, a novel hybrid HVDC transmission type is analyzed in this paper, which the sending terminal adopts phase control converter (PCC) and the receiving terminal adopts VSC. The hybrid HVDC system can supply to passive network, supply reactive power to AC system and expediently extend to two bi-terminal or multi-terminal systems from conventional HVDC system. The expressions of voltage, current and power in rectifier and inverter sides are deduced. The relationship between the operational variables and control variables is analyzed. The basic regulation characteristics are gotten. The simulation model is founded based on the simulation software PSCAD/EMTDC. Simulation results show that the hybrid HVDC system could be operated steadily when the system active power changes slowly and quickly. It has the application prospect in scope of long distance small load supplying, multi-terminal DC system connection and system black-start etc.

关键词： HVDC transmission Converters power conversion Costs Reactive power Art Voltage control Phase control Passive networks power supplies

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Coordinated control strategy for UPQC and its verification

Coordinated control strategy for UPQC and its verification

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IEEE General Meeting power& Energy society

作者： Peng Li Qian Bai Gengyin Li Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

This paper researches profoundly on the coordinated control of UPQC (unified power quality conditioner). By analyzing the radical reasons of coupling effect between UPQC series unit and shunt unit, a simple and practical coordinated control strategy for UPQC series unit and shunt unit is proposed, i.e. by introducing corresponding voltage corrective link directly to UPQC series unit and shunt unit respectively, and by suitable mode of PWM in addition, the coupling effect between its series unit and shunt unit is eliminated fully. Therefore, the complex degree of the whole UPQC control system is simplified greatly. Combined with a power quality waveform tracking method based on H infin control, the coordinated control between UPQC series unit and shunt unit is implemented by the proposed strategy. The experimental results indicate that the method can eliminate the steady-state phase shift and amplitude attenuation of the voltage tracking compensation of series unit and the current tracking compensation of shunt unit for UPQC. Finally, the unified power quality multi-function control of UPQC is achieved

关键词： power quality Optimal control Pulse width modulation Energy storage control systems Voltage Active filters power system modeling Transfer functions Circuits

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Synthetic Evaluation of power Quality Based on Fuzzy Cluster Analysis

Synthetic Evaluation of Power Quality Based on Fuzzy Cluster...

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International Conference on power system Technology (powerCON)

作者： Xiangying Duan Ming Zhou Gengyin Li Jin Yang Key Laboratory of Power System Protection Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

In the electricity market environment, the quantified description from power quality synthetic evaluation is a vital basis for power quality evaluation (PQE) and electricity pricing. This paper presents a synthetic evaluation method for power quality based on fuzzy cluster analysis (FCA). First of all, with the membership function, the degree of membership of the different indices for different monitoring places was obtained and the fuzzy similar matrix was established. After a series of conversions for fuzzy similar matrix and operations, different clustering of power quality can be obtained. With the dynamic clustering diagram, the power qualities of different monitoring places were sorted and evaluated. Some typical example analysis shows that the FCA is practicable for the synthetic evaluation of power quality, and it is also a new idea. As a matter of fact, the FCA overcomes evaluation standard limitation too definitely on evaluation results, takes into the effect of general elements on power quality and ensures objective and precision. The FCA offers a scientific basis for customers to select power suppliers and price according to power quality.

关键词： power quality power markets monitoring power system analysis computing Appraisal power generation economics Environmental economics Mathematics Statistics power supplies

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Optimal Allocation of Electromagnetic Pollution Emission Rights in power Quality Markets

Optimal Allocation of Electromagnetic Pollution Emission Rig...

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International Conference on power system Technology (powerCON)

作者： Xiaodong Yang 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 Baoding Hebei China

power quality (PQ) is an issue that is becoming increasingly important to electricity consumption. How to design a market mechanism for power quality exchange becomes acute more and more. Due to its systematic property, a managed power quality market (PQM) should be organized. In this paper, a novel competing model involving two-price bidding of demand side and marginal cost bidding of supply side is presented to optimize the allocation of emission right (ER) among the consumers in a managed PQM. The uniform price for the basic emission capacity can help to reduce the risks in markets, and the ultimate allocation can maximize the total system utility because the trading between suppliers and consumers occurs at the point of market equilibrium. An example is given to illustrate the rationality and feasibility of the proposed model.

关键词： Pollution power quality power system management Energy consumption Energy management Load management Quality management power system modeling Cost function Erbium

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Prediction method for preventing reclosing on permanent fault of shunt compensated EHV/UHV transmission lines

Prediction method for preventing reclosing on permanent faul...

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IEEE General Meeting power& Energy society

作者： Wang Zengping Liu Haofang Xu Yan Ma Jing Liu Junling Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Baoding Hebei China

A criterion is proposed to distinguish between temporary and permanent faults of shunt compensated EHV/UHV transmission lines. Its compensation criterion is established. In order to improve its sensitivity when resonant frequency is high. The performance of the criterion and its compensation criterion is hardly influenced by fault distance, fault earth resistance and the currents of healthy phases. The criterion and its compensation criterion can distinguish between temporary and permanent faults effectively and quickly. Simulation tests show that the conclusions in this paper are correct

关键词： Prediction methods Transmission lines power transmission lines Resonant frequency Resonance Voltage Shunt (electrical) Inductors power system stability Capacitance

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