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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Liu, Linli Cui, Haichao Zhao, Yabo Liu, Haibo Zhang, Xiuping Li, Xijuan State Grid Dezhou Power Supply Company Dezhou China Shandong Luneng Intelligence Technology Co. Ltd Jinan China Ministry of Education Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China

ISBN: (纸本)9781728135205

Interference caused by wind power integration has aggravated peak load regulation difficulty of power systems, especially, for the negative peak load regulation capacity. The energy storage system (ESS) is regarded as a desirable alternative for peak load regulation due to its good properties in flexibility. In order to fully exploit the advantages of ESS in peak load regulation, an optimization model aiming at maximizing the negative peak load regulation capacity is proposed in this paper. The impact of wind power uncertainty and the assistance of participated ESS on the peak shaving are considered. Then, the optimal scheme of ESS is obtained which can reduce the negative peak load regulation pressure obviously. Finally, the performance and effectiveness of the proposed method are demonstrated with actual power system in North China. © 2019 IEEE.

关键词： Energy storage

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power shift-based optimal corrective control for bipolar multi-terminal high-voltage direct current grid

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IET GENERATION TRANSMISSION & DISTRIBUTION 2019年第13期13卷 2711-2720页

作者： Ye, Hua Li, Jiahong He, Min Liu, Yutian Gao, Lei Du, Yanling Liu, Haitao Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ 17923 Jingshi Rd Jinan 250061 Shandong Peoples R China China Elect Power Res Inst 15 Xiaoying East Rd Beijing 100192 Peoples R China State Grid Jibei Elect Power Co Ltd 32 Zaolinqian St Beijing 100053 Peoples R China

The bipolar modular multi-level converter-based multi-terminal high voltage direct current (MTDC) grid offers an attractive solution to cope with the increased renewable power generation integration and power transfer capability. However, the N - 1 outage of direct current transmission lines and converters may result in overloads of other components and renewable power generation congestion. This study presents a power shift-based optimal corrective control method to guarantee the operational security of the system with bipolar MTDC grid embedded. First, the principle of power shift in the bipolar MTDC grid is analysed. The grid features in isolated positive and negative poles and can provide up to 50% transmission redundancy. Following an N - 1 contingency, certain power can be shifted from the faulty pole to the healthy pole or between different converter stations. Second, two optimisation models are, respectively, established for the MTDC and alternating current grids to address the power shift-based optimal corrective control. The proposed method guarantees operational security of the system while the amount of renewable power generation accommodation by the MTDC grid is maximised. Finally, the method is applied to the real-life Zhangbei +/- 500 kV four-terminal bipolar high-voltage direct current grid. Numerical results and electromagnetic transient simulation verify the effectiveness of the presented method.

关键词： power grids HVDC power convertors HVDC power transmission power system security power transmission protection power transmission control optimal control power transmission reliability power transmission lines voltage-source convertors bipolar MTDC grid grid features alternating current grids power shift-based optimal corrective control problem renewable power generation accommodation four-terminal bipolar high-voltage direct current grid increased renewable power generation integration power transfer capability direct current transmission lines renewable power generation congestion power shift-based optimal corrective control method bipolar multiterminal high-voltage direct current grid multilevel converter-based multiterminal high voltage direct current grid isolated positive poles isolated negative poles transmission redundancy operational security real-life Zhangbei four-terminal bipolar high-voltage direct current grid electromagnetic transient simulation

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Nonlinearity Characteristic of High Impedance Fault at Resonant Distribution Networks: Theoretical Basis to Identify the Faulty Feeder

arXiv

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arXiv 2020年

作者： Wei, Mingjie Zhang, Hengxu Shi, Fang Chen, Weijiang Terzija, Vladmir Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan250061 China State Grid Corporation of China China School of Electrical and Electronic Engineering University of Manchester United Kingdom

Feeder identification is indispensable for distribution networks to locate faults at a specific feeder, especially when measuring devices are insufficient to locate faults more precisely. For the high impedance fault (HIF), the feeder identification is much more challengeable and related approaches are still in the early stage. This paper thoroughly reveals the nonlinearity characteristics of different feeders when a HIF happens at a three-wire system that is with the resonant grounded neutral (RGN). Firstly, the diversity of nonlinearity existing in HIFs is explained from the perspective of energy. Then, the nonlinearity of zero-sequence current that differs between healthy and faulty feeders are deduced theoretically. Effects of the detuning index of Petersen coil, the damping ratio of system, and the length of feeder are all considered. Afterward, these theoretical conclusions are verified by the HIF cases experimented in a real 10kV system. Finally, after indicating the problems of a classic phase-relationship-based algorithm, we suggest an improved method based on the phase differences between the harmonic currents of different feeders. The effectiveness of the method has been verified. © 2020, CC BY.

关键词： Feeding

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Calculation of optimal load margin based on improved continuation power flow model

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2018年 94卷 225-233页

作者： Dong, Xiaoming Wang, Chengfu Yun, Zhihao Han, Xueshan Liang, Jun Wang, Yiming Zhao, Penghui Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250014 Shandong Peoples R China

This study proposed an improved continuation power flow (CPF) model to calculate the load margin for voltage stability. A self-adjusting step-size controlling scheme of CPF, which is based on the iterations in the corrector and the reactive power reserve of generator buses, is presented. The load margin here is defined either by encountering the saddle node bifurcation (SNB) or the limit-induced bifurcation (LIB). To confirm the LIB, a rapid approach is proposed to calculate the sensitivity of voltage magnitude to reactive power injection change for load buses. Because CPF with distributed slack bus (DSB) could generate different load margin results corresponding to various allocations of imbalanced power, optimization techniques should be adopted in the search for maximizing the load margin. Therefore, the improved CPF is integrated with an evolutionary mechanism-based particle swarm optimization (PSO) method via coordinate transformation. Furthermore, parallel processing is deployed in the programming for high-performance computing. The case studies for the IEEE 5-bus and IEEE 14-bus test systems demonstrate the efficiency of the proposed approaches. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Load margin Continuation power flow Step-size controlling Distributed slack bus Particle swarm optimization

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A Robust Measurement Placement Method for Active Distribution system State Estimation Considering Network Reconfiguration

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IEEE TRANSACTIONS ON SMART GRID 2018年第3期9卷 2108-2117页

作者： Wang, Hong Zhang, Wen Liu, Yutian Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China

The influences of network reconfiguration and distributed generations (DGs) on distribution system state estimation (DSSE) and measurement placement should not be ignored in active distribution systems. In this paper, considering network reconfiguration and the output uncertainties of DGs, a robust measurement placement method for active distribution systems is proposed based on measurement saturation analysis and heuristic algorithm. First, the saturation number determined by measurement saturation characteristic is chosen as the measurement number. Then, the impacts of different network topologies are represented by various weights in the robust measurement placement model, which are computed by Markov chain and analytic hierarchy process. In addition, Gaussian mixture model is applied to approximate the power fluctuations of DGs. Uncertainties caused by measurements are considered by Monte Carlo simulations. The accuracy of DSSE in different network topologies can be guaranteed by the proposed robust measurement placement method. Simulation results based on the IEEE 33-bus and 119-bus distribution systems demonstrate the effectiveness of the proposed method.

关键词： Analytic hierarchy process distributed generations distribution system state estimation Markov chain measurement saturation robust measurement placement

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Eigen-Analysis of Large Delayed Cyber-Physical power system by Time Integration-Based Solution Operator Discretization Methods

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IEEE TRANSACTIONS ON power systemS 2018年第6期33卷 5968-5978页

作者： Ye, Hua Mou, Qianying Wang, Xinlei Liu, Yutian Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Shandong Peoples R China

In this paper, solution operator discretization methods with linear multistep and implicit Runge-Kutta (SOD-LMS/IRK) are presented for efficient eigen-analysis of large delayed cyber-physical power system (DCPPS). First, the time integration-based discretization generates highly structured approximate matrices to the solution operator. Exploitation of the structure ensures low computational burden and high efficiency in solving the matrix-inversion-vector product involved in eigenvalue computation. Second, the implicitly restarted Arnoldi algorithm is employed to compute critical eigenvalue from the solution operator's discretized matrices. SOD-LMS/IRK are endowed with scalability in analyzing very large DCPPS by fully utilizing the inherent sparsity in the augmented system state matrices. The main contribution of the presented SOD-LMS/IRK is the improved efficiency and scalability of existing SOD-PS (pseudo-spectral collocation) and SOD-LMS/IRK. Numerical results on the 16-generator 68-bus test system, a 516-bus, and a 33028-hus real-life large transmission systems validate the effectiveness of the proposed SOD-LMS/IRK.

关键词： Cyber-physical power system eigen-analysis small signal stability solution operator discretization spectral discretization time delay wide-area measurement system

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Voltage pole-wave protection scheme for multi-terminal DC grid

Voltage pole-wave protection scheme for multi-terminal DC gr...

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作者： Xie, Zhongrun Zou, Guibin Gao, Lei Zhang, Jie Gao, Houlei Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education School of Electrical Engineering Shandong University Ji'nan China State Grid Ji'nan Electric Power Company Ji'nan China

With the rapid development of flexible DC transmission and multi-terminal high voltage direct current transmission (HVDC) (MTDC) grid, the protection schemes of flexible DC transmission lines are still the traditional methods, which do not achieve the properties of fast and selective operation in the DC grid. In this study, using Zhangbei MTDC grid as the research object, the fast protection of DC transmission lines of MTDC grid has been studied. First, the voltage response characteristics of fault line and non-fault line at the boundary of DC lines are analysed. On the basis of this, using wavelet transform to extract the characteristic value of voltage pole-wave, this study put forward a high-speed non-unit protection criterion to identify the internal and external faults. In addition, two auxiliary criteria are constructed to identify lightning disturbance and faulted pole, respectively. Finally, a simulation model of Zhangbei MTDC grid is constructed, and the effectiveness of the proposed protection scheme is verified by extensive simulation results. © 2019 Institution of Engineering and *** right reserved.

关键词： Poles

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Dynamic Reconfiguration of Distribution Network Based on Temporal Constrained Hierarchical Clustering and Fireworks Algorithm

Dynamic Reconfiguration of Distribution Network Based on Tem...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Yumin Zhang Xingquan Ji Jiabin Xu Ziyang Yin Xueshan Han Chao Zhang College of Electrical Engineering and Automation Shandong University of Science and Technology Qingdao China Dongying Power Supply Company State Grid Dongying China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

For the dynamic reconfiguration problem of distribution networks, the handling of switching cost constraint and the division of time period are the two key aspects that affect the performance of the reconfiguration algorithm. In this paper, an improved temporal constrained hierarchical clustering algorithm for dynamic reconfiguration of distribution networks is proposed. Firstly, the improved hierarchical clustering approach considering the temporal constraint is used to divide the operating status of the distribution network into multiple time intervals according to the similarity of loads and the output power of distributed generations (DGs). The dynamic reconfiguration of distribution networks is then transformed into multiple single-stage static reconfiguration problems, and the cluster center is used to approximately represent the load state and DG output state of the period. In order to reduce the number of infeasible solutions and poor solutions, a coding method based on heuristic rules to reduce the solution space of distribution network reconfiguration is proposed. An improved fireworks algorithm based on heuristic rules is proposed to solve the reconfiguration problem. Finally, a modified IEEE-33 test system is used to verify the validity of the proposed method.

关键词： Explosions Heuristic algorithms Switches Fireworks algorithm power system dynamics Sparks Clustering algorithms

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Fast Symmetrical Component Extraction From Unbalanced Three-Phase Signals Using Non-Nominal dq-Transformation

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IEEE TRANSACTIONS ON power ELECTRONICS 2018年第11期33卷 9134-9141页

作者： Hao, Tianqu Gao, Feng Xu, Tao Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China

This letter proposes a new algorithm for the fast extraction of symmetrical components from unbalanced three-phase signals. Being different from the conventional methods for the decomposition of positive and negative sequence components commonly realized at the cost of introducing significant delay, the proposed algorithm assumes the non-nominal dq-transformation to first produce the special d-axis and q-axis components, which will become the pure high-frequency ac signals, and then uses the typical half-cycle delay method to remove the unwanted negative or positive sequence component. Finally, the proper amplitude and phase angle coefficients can be easily calculated to compensate the remaining high-frequency d-axis and q-axis components before transforming them to the expected d-axis and q-axis values of corresponding symmetrical components. The performance of the proposed algorithm is evaluated through simulation and experiment results.

关键词： Non-nominal dq-transformation symmetrical components unbalanced three-phase signals

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Fault Modeling of IIDG Considering Inverter's Detailed Characteristics

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IEEE ACCESS 2020年 8卷 183401-183410页

作者： Shi, Xiaohan Zhang, Hengxu Wei, Chuanzi Li, Zeyu Chen, Shi Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China State Grid Shandong Elect Power Co Taian Power Supply Co Tai An 271000 Shandong Peoples R China Sichuan Univ Coll Elect Engn Chengdu 610065 Peoples R China

As more and more inverter interfaced distributed generators (IIDGs) such as PV are connected to the distribution network (DN), the existing relay protection system may malfunction due to the impact of the IIDGs. In order to evaluate that impact, the fault analysis of the DN with IIDGs is needed and the fault modelling of IIDG is of great significant for the fault analysis and the protection system validation and improvement. This paper proposes a new fault modelling method of IIDG that could consider the detailed characteristics of the inverter in different situations including the limitation of the modulation. The symmetrical fault model of PQ controlled IIDG is deduced by the proposed method, based on which the symmetrical fault analysis of the DN with IIDGs is carried out. The proposed model depicts IIDG as a voltage-controlled current source or a voltage-controlled voltage source according to whether the modulation is limited, therefore covers the full characteristics of the inverter under different conditions, improving the modelling accuracy. The case study based on the modified IEEE 13 nodes system shows that the fault analysis results obtained from the proposed model are more consistent with electromagnetic transient simulation than that of the state-of-art fault model, verifying its effectiveness.

关键词： Inverters Analytical models Modulation control systems Reactive power Mathematical model Circuit faults Inverter interfaced distributed generator (IIDG) stagtewise fault model of IIDG fault analysis of the distribution network with IIDGs modulation limitation fault ride-through

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