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International Conference on power Electronics systems and Applications (ICPESA)

作者： Wang, Jidong Liu, Kun Gao, Yanjing Yang, Guanqing Che, Yanbo Key Laboratory of Power System Simulation and Control Tianjin University Ministry of Education Tianjin China

ISBN: (纸本)9781457702051

The voltage flicker which might bring out lighting equipments glitter and images distortion, make people's visual fatigue and adversely affect people's daily lives is caused by the great increase of shocking and nonlinear loads in the power system. In this paper, the causes, detection and measurement of the voltage fluctuation and flicker are analyzed, instantaneous reactive power theory detection method is used for simulation of voltage fluctuations and calculation of short-time flicker value and compared with square detection. The flicker values obtained by instantaneous reactive power theory detection are close to the real value, and the result of simulation shows the effectiveness of this method. © 2011 IEEE.

关键词： Reactive power

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Integral planning for distribution system

Integral planning for distribution system

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Asia-Pacific power and Energy Engineering Conference, APPEEC 2010

作者： Jikeng, Lin Xudong, Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424448135

A new integral planning method for distribution system without candidate schemes is proposed in the paper. Transportation model is applied to the load assignation. A two-step optimization strategy is developed to obtain the optimal solution in each sub-region for each scheme of substation-capacity combinations. The proposed method is implemented and tested successfully with one practical urban distributed system. Comparisons are made between the traditional grading planning approach and the new integral planning method, which demonstrates the potential advantage of the method in practice. ©2010 IEEE.

关键词： Grading

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A study on steady characters of inverter interfaced distributed generation in three phase symmetrical system

A study on steady characters of inverter interfaced distribu...

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2010 International Conference on power system Technology: Technological Innovations Making power Grid Smarter, powerCON2010

作者： Jin, Qiang Li, Yong-Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424459407

Recently inverters are all-pervading used as the connective instrument of distributed generations and distributed power system. When inverter interfaced distributed generations are connected to the distribution system, it may bring some new problems on load flow and fault characteristic and protection. The analysis on steady characters of PQ control mode and VF control mode inverter interfaced distributed generation is done when the system is three phase symmetrical. Generally speaking there are limits on power and current in control system for the security of distributed generations and power electronic devices in inverter, so the analysis is more complex. The mathematical analysis on three phase symmetrical system is done and restriction equations are described whether three phase symmetrical fault occurs or not. For the solution of the equation groups expresses the steady state of the system, so the solution of the equation groups is one and only. Then the restriction equation groups are solved. The solution in different areas shows the reason of steady non-linear character of inverter interfaced distributed generations and the simulation shows the conclusion correct. The steady characteristic curves of PQ control mode and VF control mode inverter interfaced distributed generation about voltage and current and power are got from the function of voltage and current and power at the same time. PQ control mode and VF control mode inverter interfaced distributed generation behave similarly but not identically when three phase symmetrical fault occurs in three phase symmetrical system. The disadvantageous influence on protection is analysed by the way. ©2010 IEEE.

关键词： Distributed power generation

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A grid-connection control scheme of PV system with fluctuant reactive load

A grid-connection control scheme of PV system with fluctuant...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Li, Bin Tian, Xiaohe Zeng, Hongyan Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781457703638

The fluctuations of reactive load in micro-grid will have a great impact on the supply voltage. In this paper, a novel grid-connection control is proposed in view of this problem, based on a model of a PV system with load paralleled in large system. It can not only make full use of photovoltaic power, but also maintain a stable voltage with a fluctuant reactive load. It adopted double-loop principle in inverter control. The grid-connected current of the PV system and the current of large system are both decoupled into active and reactive component by abc/dq0 transformation to achieve the independent control of active and reactive power. On the one hand, the active component of the PV grid-connected current is adjusted to the reference value given by the Maximum power Point Tracking (MPPT) in order to maintain maximum active power output of PV, the reactive component of the large system current is adjusted in order to maintain a constant reactive power output. Thus a stable supply voltage can be maintained with a fluctuant reactive load, as the supply voltage of the grid-connected PV system is mainly sustained by the large system. On the other hand;the main circuit topology of three-phase reactive power compensation device and three-phase grid-connected inverter is exactly the same. Thus, in support of a reasonable control strategy it can be integrated together with both function of grid connection and reactive power compensation control. These can ensure a stable voltage in the PV system with a fluctuant reactive load paralleled in large system by the regulation of power. Its advantages compared with the simple and traditional unity-power-factor inverter control scheme are validated by simulation with Matlab/Simulink. © 2011 IEEE.

关键词： Reactive power

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Asynchronous parallel simulation of transient stability based on equivalence

Asynchronous parallel simulation of transient stability base...

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1st International Conference on Sustainable power Generation and Supply, SUPERGEN '09

作者： Jikeng, Lin Xudong, Wang Xinyu, Tong Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424449347

An asynchronous parallel method based on equivalence is proposed for transient stability simulation of power system. In the method, the system is partitioned into several interconnected subsystems by geographical location, and the subsystems are equivalent each other at each integration step. Each subsystem utilizes equivalent information from other subsystems to calculate independently. At each integration step, a subsystem only needs the predictive equivalence and correctional equivalence once. Additionally, asynchronous parallel technology based on the MPI on the PC-Cluster platform is designed to speed up the convergence. Several cases demonstrate that the proposed method has fast calculation speed and efficiency, as well as the simulation precision accepted for engineering application. For some large scale real system, the real-time or even super-real-time simulation will be realized.

关键词： Transients

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Harmonic analysis method based on multiple modulation zoom analysis and interpolating windowed FFT method

Harmonic analysis method based on multiple modulation zoom a...

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International Conference on power Electronics systems and Applications (ICPESA)

作者： Wang, Jidong Yang, Guanqing Wen, Jing Zhu, Dong Che, Yanbo Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781457702051

Since many power electronics equipments and nonlinear loads were accessed, more and more harmonics and inter-harmonics occurred in power system. But when the analyzed signal contains components with frequency close to each other, precise analysis can not be made by traditional harmonics analysis methods such as interpolating windowed FFT method. In this paper, first a new method-multiple modulation zoom analysis based on complex analytic bandpass filter is adopted to make an accurate analysis to this kind of components. Then the remaining components are also analyzed by traditional method. simulations compared to direct interpolating windowed FFT method show that the proposed method can make a much better analysis with higher frequency resolution and so effectiveness of this method is demonstrated. © 2011 IEEE.

关键词： Harmonic analysis

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A study on capacity of distributed generation and its effect on short circuit current at micro-grid operation mode

A study on capacity of distributed generation and its effect...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Qiang, Jin Shuo, Zhang Yong-Li, Li Key Laboratory of Power System Simulation and Control Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781457703638

Now more and more distributed generations will be connected to distributed power system. It's found that different distributed generation has its own operation characteristic such as fluctuation and uncertainty. When micro-grid is to be island the voltage and frequency will change, so different control modes have been used on different distributed generation. Different kinds of distributed generation have different behavior when system operates normally or fault occurs. Classification and equivalence were adopted to deal with all kinds of the distributed generations in system. The distributed generations with same control mode can be combined to an equivalent generation. When system operates on grid-connection mode the short circuit current relies on the capacity of grid so it is rather large for the capacity of distribution grid is much more than that of distributed generations. But when micro-grid operates on island mode the short circuit current may decrease to a relative small value. Over current protection is widely used in distribution system, and the performance of it is dependent on operation mode, so the value estimate of short circuit current is necessary for verification of credibility and selectivity. Two summations of capacity were proposed to estimate the minimum and maximum short-circuit current in island. © 2011 IEEE.

关键词： Distributed power generation

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A Novel Directional Pilot Protection for Flexible DC Distribution Grid 9

A Novel Directional Pilot Protection for Flexible DC Distrib...

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9th Asia Conference on power and Electrical Engineering, ACPEE 2024

作者： Wei, Xiuyan Zou, Guibin Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Ji'nan250061 China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Jilin132012 China

ISBN: (纸本)9798350309638

The existing directional pilot protection (DPP) is susceptible to the line distributed capacitance and the fault resistance, and mostly rely on the current limiting reactance (CLR) at the line ends. To solve the above problems, the line-mode fault component power (LFCP) based DPP is proposed for flexible DC distribution grid (FDCDG). First, the characters of LFCP are discussed under different faults. The theoretical analysis show that the polarity of the LFCP under internal fault is same, while the polarity of the LFCP is opposite under external fault. Then, the LFCP is built as the directional criterion, and the corresponding protection scheme is constructed. The electromagnetic transient simulations of the PSCAD/EMTDC verify that the proposed DPP is less affected by the noise, and has low requirement on the sampling rate, strong engineering applicability. © 2024 IEEE.

关键词： Electric power distribution

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Reliability evaluation for distribution system with distributed generation

Reliability evaluation for distribution system with distribu...

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Asia-Pacific power and Energy Engineering Conference, APPEEC 2010

作者： Jikeng, Lin Xudong, Wang Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin China

ISBN: (纸本)9781424448135

Based on the simplification equivalence network, a new reliability evaluation method using the Monte Carlo time sequential simulation for the distribution system with distributed generations (DGs) is presented in this paper. By the zone element failure effect table calculated at the simplification network, the impact of the DGs' stochastic power output, running/failure statuses of the devices and the stochastic capacity of the loads on the distribution system reliability are computed by the Monte Carlo time sequential simulation. With the help of the equivalence network, the ransack processing during the calculation is greatly reduced, and the repetitive failure analysis is avoided. In the stochastic simulation process, the strategy of synchronously sampling for the states of DGs and the network devices is adopted, which increases the precision of the simulation compared with the other methods. The results of the samples demonstrate the validity and practicability of the new method. ©2010 IEEE.

关键词： Distributed power generation

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Security region based real and reactive power pricing of power system

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Science China(Technological Sciences) 2008年第12期51卷 2095-2111页

作者： YU YiXin1 & WANG YanJun1,2 1 key laboratory of power system simulation and control of Ministry of Education,Tianjin University,Tianjin 300072,China 2 College of Mechanical and Electrical Engineering,Agriculture University of Hebei,Baoding 071001,China Key Laboratory of Power System Simulation and Control of Ministry of Education Tianjin University Tianjin 300072 China College of Mechanical and Electrical Engineering Agriculture University of Hebei Baoding 071001 China

This paper develops a novel model and an algorithm of security region based real and reactive power pricing of power *** the proposed model,the reactive power production cost is represented as the opportunity *** static voltage stability region in the cut set power space(CVSR) and the practical dynamic security region(PDSR) in the injection power space are used to represent the constraints of voltage stability and transient stability,so that the consideration of this kind of constraints in the optimization becomes very *** the proposed algorithm,a decoupled optimization and iteration method of active power production cost and reactive power production cost is *** to the K-T optimality conditions,the prices of active power and reactive power,and the different components corresponding to the concerned security constraints are *** components of spot prices can reflect the influence of different node power injections on each kind of security constraints,so that through the node price all of the participants in power market can be stimulated to take an active part in maintaining the system *** illustrative example on the New England 10-genetator 39-bus system is used to demonstrate the proposed method.

关键词： static voltage stability region practical dynamic security region opportunity cost spot price active power and reactive power

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