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The influence of mobile signal in UHF PD monitoring and our solving

The influence of mobile signal in UHF PD monitoring and our ...

引用

International Symposium on Electrical Insulation

作者： Wei Wang Chengrong Li Bin zheng Guiqian Zhao North China Electric Power University Beijing Beijing CN Beijing Key Laboratory of High Voltage & EMC Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Beijing China

In this paper, the influence of mobile signal in UHF PD monitoring is discussed in types of substation in China. To find the solving, the GSM mobile signal's spectrum are measured and analyzed both in laboratory and onsite. The results show that the mobile signal's spectrum is broad when the phone signal is emitted. It is hard to avoid this interfere only by using narrow measuring band. At the same time, the GSM mobile signal's transmission characteristic in GIS was simulated in our model under laboratory conditions. In brief, our findings are discussed through two projects. The results show our finding is available and effective

关键词： Monitoring Substations GSM Laboratories Multiaccess communication UHF measurements Signal analysis Filters Interference Geographic Information systems

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Study on Wide Area Backup protection to Prevent Cascading Trips Caused by Flow Transferring

Study on Wide Area Backup Protection to Prevent Cascading Tr...

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IEEE PES Transmission and Distribution Conference and Exposition

作者： Xu Bi Huang Yang Si Fang Research Institute Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China

Protective relays, pivotal devices that can quickly identify and isolate fault area in power systems, is of great importance for power network security and reliability. When relays trip a faulted line in the network, 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. Studies on several well-known blackouts reveal that protective relays are involved and the most troublesome ones are backup protective relays. In this paper the defects of the existing backup protections are investigated in detail first. Then a new wide area backup protection scheme based on WAMS to identify flow transferring is presented. 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 on-line is also stated. The simulation of a three machines network shows that the wide-area backup protection scheme to identify flow transferring works well

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

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A Nucleolus-Based Profit Allocation Method for Determine Individual power system Stabilizer's Contribution to system Stability

A Nucleolus-Based Profit Allocation Method for Determine Ind...

引用

International Conference on power system Technology (powerCON)

作者： Wei Pan Wenying Liu Yihan Yang Yangnan Li Lin Cheng Yunlong Tang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control in Ministry of Education North China Electric Power University Beijing China Xuji Hitachi Company China

The issue of pricing the services provided by power system stabilizers (PSS) to damp out low-frequency oscillations in large interconnected electrical power grids is proposed. Taking the dominant eigenvalue method for analytical tool to evaluate the increased transfer capability when PSS-control services are utilized, a method based on nucleolus in the cooperative game theory to determine the individual PSS services provider's contribution to power systems stable operation, and allocate the profit obtained by total transaction level increment among all PSS services providers is presented. The calculation results show that the proposed method can achieve rational allocation, and have incentive effect on popularizing PSS application. These are helpful for the stable and economical operation of electricity markets.

关键词： power system stability power system interconnection power system analysis computing Pricing power grids Eigenvalues and eigenfunctions Game theory power system economics power generation economics Electricity supply industry

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Study on Control Strategies to Improve the Stability of Multi-Infeed HVDC systems Applying VSC-HVDC

Study on Control Strategies to Improve the Stability of Mult...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Chengyong Zhao Ying Sun Key Laboratory ofPower System Protection and Dynamic Security Monitoring and Control under Ministryof Education North China Electric Power University Baoding Hebei China

Against the stability of the multi-infeed HVDC (MIDC) transmission system, voltage source converter based HVDC (VSC-HVDC) is applied to MIDC systems. The new systems can reduce probability of commutation failure and improve the stability of the MIDC systems. A physical model of a multi-infeed HVDC and VSC-HVDC system is developed, and its mathematical model is analyzed. The rectangular coordinate form of VSC's power transmission equations is deduced through coordinate conversion. Based on the inverse system method for multivariable nonlinear control, the nonlinear controllers of the multi-infeed HVDC and VSC-HVDC system are designed. Simulation results by PSCAD/EMTDC show that the designed nonlinear controllers improve effectively the voltage stability of the multi-infeed HVDC and VSC-HVDC system under small or large disturbances, such as short circuit fault, reduce the probability of commutation failure in the inverter of HVDC systems and increase the operation reliability of HVDC systems

关键词： Control systems Stability HVDC transmission Converters power conversion Nonlinear control systems Mathematical model Voltage power system modeling power transmission

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Novel method for disturbance identification in power systems

Novel method for disturbance identification in power systems

引用

IEEE General Meeting power& Energy Society

作者： T.S. Bi X.N. Song J.T. Wu 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 Sifang Protection and Control Company Limited Beijing China

With the development of power grid interconnection, it is necessary for operators to know about system dynamic status while disturbance occurs in power systems in order to take appropriate counter measures to ensure the power system security. The advent of wide area measurement system (WAMS) makes the monitoring of power system dynamic behavior become possible. Based on WAMS, a method for identifying different kinds of disturbance in power system is presented in this paper. Firstly, the features of disturbances (i.e. short circuit, load shedding and loss of generation) that frequently occur in power system are analyzed in detail. Then, based on the idea of pattern recognition, the suggested disturbance identification method is discussed. Finally, computer simulation results are carried out in North China power grid, which demonstrate the validity of theoretical analysis and the feasibility of the proposed disturbances identification method

关键词： power systems power system dynamics power system measurements power system security power system interconnection power grids Wide area measurements power system analysis computing power system simulation Integrated circuit interconnections

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A Hierarchical Control Scheme for Transient Stability Augmentation by Thyristor Controlled Braking Resistors

A Hierarchical Control Scheme for Transient Stability Augmen...

引用

International Conference on power system Technology (powerCON)

作者： X. Y. Zhang S. F. Huang Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control (North China Electric Power University) Ministry of Education Si Fang Research Institute North China Electric Power University Beijing 102206 P.R. China. e-mail: huangsf@***

In this paper, a hierarchical control scheme for improving transient stability of power systems by thyristor controlled braking resistor is proposed. Based on three-level co- state prediction method of large-scale system principle, the control structure is organized into a two-layer controller. The lower layer is composed of decentralized local feedback controllers, each of which takes local feedback signal and controls its connected generator. In the upper layer a global controller is designed to enhance the effectiveness of decentralized local controllers. The global controller coordinates local controllers by generating remote feedback signals which ensuring the global optimal solution of the overall system transient performance. The proposed control scheme can guarantee fast and accurate control actions of local controllers when a power system is subjected to large disturbances. Simulation results show the effectiveness of the proposed control scheme.

关键词： Thyristors Resistors Control systems power system transients power system stability power system control power systems Feedback Signal generators Optimal control

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Effect on Earth Fault Detection Based on Energy Function Caused by Imbalance of Three-Phase Earth Capacitance in Resonant Grounded system

Effect on Earth Fault Detection Based on Energy Function Cau...

引用

International Conference on power system Technology (powerCON)

作者： Hongquan Ji Yihan Yang Hongbo Lian Shu'an Cong Key Laboratory of Power System Protection Dynamic Security Monitoring and Ministry of Education North China Electric Power University Beijing China School of Electrical Engineering North China Electric Power University Beijing China

In resonant grounded system when single-phase earth fault occurs, for arc suppression coil cannot compensate the active current of the zero-sequence grounding current passing through the fault point, the zero-sequence active current passing through the fault line is the sum of those passing through the non-faults. Therefore in theory the zero-sequence active current passing through the fault line is greater than others in absolute value. Energy function is the integrating of product of zero-sequence voltage with zero-sequence current. The fault line's energy function value is negative, while the non-fault's is positive. If three-phase earth capacitance is imbalanced, zero-sequence voltage produces, which will produce zero-sequence current passing through all the line. This zero-sequence current is the key variable that influences the phase-angle between non-fault zero-sequence current and the zero-sequence voltage. This paper analyzes the influences in different compensation conditions in theory. Simulation results are presented to demonstrate that the validity of earth fault line detection based on energy function will be worse and worse accompanied with the increasing of earth resistance when single-phase earth fault occurs on the imbalanced phase, and indicate that energy function has its validity scope.

关键词： Fault detection Capacitance Resonance Voltage Earth power system security Coils Electrical fault detection Laboratories power system protection

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Study on the control of DFIG and its responses to grid disturbances

Study on the control of DFIG and its responses to grid distu...

引用

IEEE General Meeting power& Energy Society

作者： Ming Yin Gengyin Li Ming Zhou Guoping Liu 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 Shijiazhuang Electricity Company Shijiazhuang Hebei China

The paper presents the dynamic model of doubly fed induction generator (DFIG) including the mechanical model, the generator model and the PWM voltage source converter model. The mechanical model uses two-mass model, and the generator model includes both the stator side and the rotor side dynamics. The PWM voltage source converter is modeled as an average model in which the action of power electronic switches is neglected. The paper features vector control of DFIG. On the rotor side converter, the control scheme enables the independent control of speed and reactive power from the stator. On the grid side converter, the control scheme is implemented to regulate the DC voltage and reactive power from the grid as well. In order to study the influence of the grid disturbances on the DFIG, grid voltage dip and quick frequency change are simulated with the engineering software, MATLAB/Simulink. Meanwhile, in the paper the pole-placement method and internal model control method are implemented for designing the PI controllers

关键词： Mathematical model Induction generators Pulse width modulation Pulse width modulation converters Voltage Stators Rotors Reactive power control Switching converters power electronics

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The Perturbed Trajectories Prediction Method Based on Wide-Area Measurement system

The Perturbed Trajectories Prediction Method Based on Wide-A...

引用

IEEE PES Transmission and Distribution Conference and Exposition

作者： Song Bi Li Yang Liu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Beijing China North China Electric Power University Beijing Beijing CN Beijing Power Company in Beijing China

In this paper, a novel method for perturbed trajectory prediction of post-fault rotor angle is presented based on PMU (phasor measurement unit) measurements and trigonometric function curve fitting technique. A mathematical model about the relationship of post-fault rotor angle and time is derived from a speed-governing system model, which reveals that the perturbed trajectory of the post-fault rotor angle can be expressed by trigonometric functions. By curve fitting technique, a least square method to predict the perturbed trajectory using trigonometric function is proposed. Numerical simulations are conducted on IEEE 9-bus system to test the effectiveness of this method. The proposed method can give more reasonable and more promising prediction results as compared with polynomial curve fitting technique

关键词： Trajectory Prediction methods Wide area measurements Curve fitting Phasor measurement units Mathematical model Measurement units Least squares methods Numerical simulation system testing

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Study on Energy-saving Strategies for dynamic Voltage Restorer

Study on Energy-saving Strategies for Dynamic Voltage Restor...

引用

International Conference on power system Technology (powerCON)

作者： L.x. Zhi Z.d. Yin H. Ding J.b. Han F.x. Hu Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education North China Electric Power University Beijing China Power Dispatching and Communication Center China Southern Power Grid Company Limited GuangZhou China

Traditional voltage injection methods for DVR are in-phase strategy which injects voltage in phase with the sag voltage and missing voltage technique which compensates for the difference between the sag and pre-sag voltages. Since a certain component of injected voltage is in-phase with the load current, DVR has to provide some amount of energy to the grid. This paper use DQ analyzing method based on instantaneous reactive power theories to detect and obtain the parameters of source side voltage for balanced faults of three-phase three-wire system. Through circumgyrating the phasor and injecting voltage with an appropriate advance phase relative to source side voltage, the minimum energy injection can be achieved. For unbalanced faults, fictitious three-phase voltages which come from a single- phase source can be constructed mathematically, so unbalanced faults can be dealt with easily in a balanced way. Simulation results are presented to demonstrate the validity of the proposed method.

关键词： Voltage fluctuations Uninterruptible power systems Voltage control power system restoration power system dynamics Control systems Reactive power Fault detection Costs Energy management

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