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8th Renewable power Generation Conference, RPG 2019

作者： Zhu, Jianhang Ma, Shicong Gong, Xuan Hu, Jiabing School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Power System Department China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781839531255

Small-signal stability is one of the main issues for the safe operation of power system. The traditional studies mainly focus on stability determination of power system, but the issue after system oscillation divergence is seldom involved, which may cause system collapse and trigger protective actions, or oscillate at a constant amplitude with a certain frequency. In this paper, the mechanism of small-signal instability diverging to constant amplitude oscillation (CAO) is studied for grid connected converters, which only considers the nonlinear factors introduced by phase-locked loop (PLL) controller. Based on the nonlinear analysis method of Lyapunov exponent, the CAO is caused by the nonlinear limit cycles, which is investigated for the first time, and the period of nonlinear limit cycle dose not correspond to the unstable modal frequency of small-signal analysis. When the system oscillates stably with constant amplitude, the system model cannot be described by linear-time invariable (LTI) model in constant speed reference frame of base frequency, then the linear-time periodic (LTP) theory is introduced into this case. Based on the Floquet theory, the eigenvalue locus of LTP model in time-domain illustrates the process of unstable system at constant steady-state operating point diverging to a stable system at steady-state trajectory. Finally, the validity of the analysis is verified by simulation. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Phase locked loops

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Robust Dispatch of Integrated Electric-Heat systems Considering Weather-Parameter-Driven Residential Thermal Demands

Robust Dispatch of Integrated Electric-Heat Systems Consider...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Guanghui Hua Chen Li Yong Zhang Dan Li Chuang Liu Cheng Wang State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institut Nanjing China National Power Dispatching and Control Center Bejing China State Grid Hebei Electric Power Co. Ltd. Shijiazhuang China State Grid DC Engineering Construction Company Bejing China School of Electrical and Electronic Engineering North China Electric Power University Bejing China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

Conventional day-ahead scheduling strategies of integrated electricity and heating system (IEHS) are oversimplified for the thermal demand modeling and cannot meet the thermal comfort of the users. Furthermore, this unbalanced power may lead to reserve capacity deficiency in the power system, due to the thermal-electric coupling of the combined heat and power (CHP) units in IEHS. This paper derives a tractable and accurate residential thermal demand (RTD) model, which comprehensively considers the impact of weather conditions. Then, a robust scheduling strategy is employed to tackle the uncertainties of the renewable generation outputs and RTDs, suggesting a double-stage optimization model. The first stage is to identify the unit commitment with minimum operational cost. In the second stage, the feasibility of the first stage unit commitment would be checked to minimize the summation of slack variables. Besides, the robust optimization model is converted into a mixed-integer linear program via the big-M method and solved by column and constraint generation (C & CG) algorithm. The simulation results show the effectiveness of the proposed RTD model, as well as the robust scheduling strategy for IEHS.

关键词： Uncertainty Simulation Cogeneration Stochastic processes system integration Optimization Meteorology

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A multi-sequence method for monthly unit combination optimization using flexible resources

A multi-sequence method for monthly unit combination optimiz...

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作者： Dai Cui Fei Xu Weichun Ge Yong Min Yunhai Zhou Xiaodong Chen Pinchao Zhao School of Electrical Engineering Shenyang University of Technology Jinzhou Power Supply Company Liaoning Electric Power Co. Ltd. Department of Electrical Engineering Tsinghua University College of Electrical Engineering & New Energy China Three Gorges University Hubei Provincial Key Laboratory for Operation and Control of Cascaded Hydropower Station China Three Gorges University

In order to solve the problem of renewable power curtailment, the authors put forward a multi-sequence monthly unit combination optimization method using flexible resources. In addition, an algorithm is proposed to estimate the capacity of peak load shifting of flexible resources in day-ahead or intraday scheduling. By optimizing various types of flexible resource scheduling in day-ahead or intraday scheduling, the maximum load of the system is lessened,and the limit on the capacity of thermal power units is reduced to improve the system's ability to accommodate renewable power. In the monthly unit combination optimization model, the total minimum output of thermal power units is introduced into the objective function, which can further reduce the thermal power start-up capacity in the monthly plan to increase the system's spinning reserve and to expand the renewable power accommodation capacity of the *** practical constraints are taken into account. The mixed integer programming and software GLPK are used to program and solve the model. Finally, an example of a provincial grid in north China is given to verify the effectiveness of the proposed method.

关键词： A multi-sequence method for monthly unit combination optimization using flexible resources

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Development and test research of 10kv DC circuit breaker based on the principle of coupled negative voltage

Development and test research of 10kv DC circuit breaker bas...

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The 16th IET International Conference on AC and DC power Transmission (ACDC 2020)

作者： W. Li B. Liu F. Xiao H. Wang Y. Wang W. Xie Z. Yu Shandong Taikai High-Voltage Switchgear Co. Ltd. Tai’an China China Electric Power Research Institute Beijing China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment (Department of Electrical Engineering Beijing China

With the increase of multi-terminal flexible DC distribution network projects, medium-voltage DC circuit breaker, as the key equipment to remove DC short-circuit fault, plays a key role in the operation reliability of the whole DC distribution network. In order to meet the engineering needs of DC distribution network, a 10kV hybrid DC circuit breaker based on the coupling negative voltage principle is developed in this paper. Firstly, the topology and working principle of the DC circuit breaker are introduced. Furthermore, the design scheme of key components including fast mechanical switch, power electronic switch and coupling negative voltage device is given. Finally, a 10kV hybrid DC circuit breaker prototype is developed and tested. The results show that the 10kV hybrid DC circuit breaker can break 15kA short circuit current within 2ms, and has the characteristics of low loss and high reliability.

关键词： circuit breakers short-circuit currents DC distribution systems power distribution faults power distribution reliability

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Sensorless control on a Dual-Fed Flux Modulated Electric Motor

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CES Transactions on electrical Machines and systems 2019年第1期3卷 65-71页

作者： Xiang Luo L.Zhu Xu Cai Weinong Fu Xinye Wu Key Laboratory of Control of Power Transmission and Conversion(SJTU) Ministry of EducationShanghaiChina Electrical Engineering Department Hong Kong Polytechnic UniversityKowloonHong Kong Management Department State Grid Shanghai Municipal Electric Power CompanyShanghaiChina

This paper proposes the operation principle and a new flux estimation method for sensorless control strategy for the dual-fed flux modulated electric motor(DFFM).The DFFM is designed based on the flux modulation theory,it includes two stator windings and one rotor which simplify the mechanical *** rotor has only modulation iron and no permanent magnets on it,so there is no cogging torque problem in this *** adjustment of the outer and inner stator flux rotating frequency and amplitude,different rotation speed and torque of the sandwiched rotor can be gained for the ***,an improved flux estimation based sensorless control strategy is performed on the proposed machine to fit the two winding set control *** startup and performance of the proposed control strategy is verified by the simulation and experiments.

关键词： Dual-fed flux modulated electric motor flux estimation flux modulation sensorless control

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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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Capacitor Allocation in Distribution systems Using Fuzzy Loss Sensitivity Factor with Sine Cosine Algorithm

Capacitor Allocation in Distribution Systems Using Fuzzy Los...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Kamel, Salah Selim, Ali Jurado, Francisco Yu, Juan Xie, Kaigui Wu, Tao State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing University Chongqing400030 China Department of Electrical Engineering University of Jaén Jaén Spain

ISBN: (纸本)9781728135205

This paper aims to propose an optimization method for optimal allocation of shunt capacitors in distribution networks to minimize the total active power losses and total energy cost with enhancing the voltage profile. The proposed method is carried out using two stages. In the first stage, candidates' buses are determined using fuzzy logic control based on Normalized Loss Sensitivity Factor (NLSF) and voltage magnitude at each bus. The system buses are ordered descending based on the fuzzy output where the highest buses are chosen as candidate buses. In the second stage, a recent metaheuristic technique, Sine Cosine Algorithm (SCA), is used to calculate the shunt capacitor size where the candidate buses are used as initialized locations to decrease the search area of SCA. The final optimal size and location of shunt capacitors are specified through the SCA iterative process. The developed optimization method is comprehensively compared with the other optimization methods used for the same pattern to prove its effectiveness. The simulation results are performed on the 15-bus and 69-bus distribution networks using MATLAB M. Files. © 2019 IEEE.

关键词： Fuzzy control

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Blockchain Technology Based Decentralized Energy Trading for Multiple-Microgrid systems 3

Blockchain Technology Based Decentralized Energy Trading for...

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3rd IEEE Conference on Energy Internet and Energy system Integration, EI2 2019

作者： Li, Ting Zhang, Wei Chen, Ning Qian, Minhui Xu, Ying School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China EPRI Nanjing China University of Central Florida Department of Electrical Engineering Computer Science Orlando United States

ISBN: (纸本)9781728131375

With the emerging technology for distributed generation and urge of improving quality of service of power supply for energy users, more and more Microgrids (MGs) are integrated into the distributed networks to serve the energy users. These Microgrids are gradually formulating a Multi-Microgrid system (MMGS, Multi-Microgrid system), which will play an important role for the future energy supply. Building a centralized control center not only increases the expense of investment, but also brings the issues of maintaining fairness among energy users. To address these problems, this paper proposes a peer-to-peer method for energy trading of MMGS, based on the idea of decentralized trading. An auction-based trading mechanism suitable for peer-to-peer energy trading is proposed first. For this mechanism, the MGs firstly declare their energy buying bids or selling quotations. Then, the market-clearing price is determined by using a unified weight clearing algorithm in a decentralized manner. By applying the edge technology of Blockchain, the implementation of the proposed peer-to-peer energy trading method, including the architecture, procedures, security check, etc., is also discussed. The proposed Blockchain-based energy trading platform can realize the decentralized and autonomous energy trading of MGs within an MMGS. A case study with an MMGS with 10 MG units is provided to demonstrate the effectiveness of the proposed approach. © 2019 IEEE.

关键词： Blockchain

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Study on deep-peak regulation of coal-gas-hydro power system in Portugal when considering high wind penetration 8

Study on deep-peak regulation of coal-gas-hydro power system...

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8th Renewable power Generation Conference, RPG 2019

作者： Liang, Zhao Ruoying, Yu Peijin, Chen Bin, Han State Key Laboratory of Operation and Control of Renewable Energy Storage Systems China Electric Power Research Institute Beijing100192 China School of Electrical Engineering Southeast University Nanjing Jiangsu Province210096 China China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781839531255

In the field of renewable energy generation, Portugal is in the leading position in the world. The electricity production of wind farms accounting for one third of the total electricity demand in Portugal. At the same time, the high penetration of wind power in the country's power system brings more uncertainty to net demand, which can bring grave challenges to peak load regulation. Considering the high penetration rate of wind power in Portugal power gird, a model on configuration of peak load regulation resources and a strategy of peak load regulation are established. The model aims to minimize the prime cost of peak load regulation. It is based on the mathematical model of each kind of resource. It also reckons the difference of hydro plants' peak shaving ability in different seasons. Finally, it proves its rationality and practicability through applications on specific examples of Portugal power system. The results show that the study on this model has great importance to peak load regulation in a power system with high penetration rate of new energy resources. © 2019 Institution of engineering and Technology. All rights reserved.

关键词： Coal deposits

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Tertiary regulation of cascaded run-of-the-river hydropower in the islanded renewable power system considering multi-timescale dynamics

arXiv

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arXiv 2020年

作者： Qiu, Yiwei Lin, Jin Liu, Feng Dai, Ningyi Song, Yonghua Chen, Gang Ding, Lijie State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100087 China State Key Laboratory of Internet of Things for Smart City University of Macau 999078 China State Grid Sichuan Electric Power Research Institute Chengdu610000 China

To enable power supply in rural areas and to exploit clean energy, fully renewable power systems consisting of cascaded run-of-the-river hydropower and volatile energies such as pv and wind are built around the world. In islanded operation mode, the primary and secondary frequency control, i.e., hydro governors and automatic generation control (AGC), are responsible for the frequency stability. However, due to limited water storage capacity of run-of-the-river hydropower and river dynamics constraints, without coordination between the cascaded plants, the traditional AGC with fixed participation factors cannot fully exploit the adjustability of cascaded hydropower. When imbalances between the volatile energy and load occur, load shedding can be inevitable. To address this issue, this paper proposes a coordinated tertiary control approach by jointly considering power system dynamics and the river dynamics that couples the cascaded hydropower plants. The timescales of the power system and river dynamics are very different. To unify the multi-timescale dynamics to establish a model predictive controller that coordinates the cascaded plants, the relation between AGC parameters and turbine discharge over a time interval is approximated by a data-based second-order polynomial surrogate model. The cascaded plants are coordinated by optimising AGC participation factors in a receding-horizon manner, and load shedding is minimised. Simulation of a real-life system with real-time pv data collected on site shows the proposed method significantly reduces load loss under pv volatility. Copyright © 2020, The Authors. All rights reserved.

关键词： Electric load shedding

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