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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Zhang, Yumin Han, Xueshan Xu, Bo Zhang, Li Sun, Donglei Miao, Xiaofeng Jiang, Jiayin Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China Economic and Technology Research Institute of State Grid Shandong Electric Power Company Jinan China State Grid Shandong Electric Power Company Yantai Electric Power Company Yantai264001 China

ISBN: (纸本)9781538614273

The active participation of demand side resources in power grid operation not only benefits the individual participant but also benefits the whole system. The optimal goal can promote by excavating the active behaviors of demand side. The welfare maximization of market participant is the driving force of such active behaviors. Considering the independence of each user's behavior, the consumer's utility function is selected to depict consumer's preference and demand response behavior. In order to coordinate the consumers' maximum welfare with social welfare maximization, consumers' utility function and units' operation cost are integrated into Unit Commitment (UC) model. The objective function is to maximize social welfare, by subtracting units' operation cost from consumers' total utility, and this objective can be acquired. Considering the proposed model should be solved in a distributed manner, the idea of the centralized coordination and the decentralized decision-making is proposed. Based on the Lagrangian relaxation (LR) principle and distributed real-time pricing scheme, a closed-loop feedback mechanism is constructed to reflect the relationship among generator output, price level, and load demand. The ten generating units example can illustrate the effectiveness of the proposed method. © 2017 IEEE.

关键词： Power markets

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Economic analysis of multi-energy virtual power plant considering market information

Economic analysis of multi-energy virtual power plant consid...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Wang, Jiazhen Shen, Xinwei Guo, Qinglai Xiong, Wen Tang, Lei Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Insitute Tsinghua University Shenzhen China State Key Lab of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China Guangzhou Power Grid Company Guangzhou Lei Tang Beijing Qingda Gaoke System Control Company Beijing China Beijing Qingda Gaoke System Control Company Beijing China

ISBN: (纸本)9781538614273

Integrated Energy System is beneficial for promoting the distributed renewable energy (DRE) consumption, thereby alleviating environmental pollution and energy shortage. In this paper, we propose a virtual power plant (VPP) structure considering the feature of heat and electric power system integration, which is defined as Multi-energy Virtual Power Plant (MVPP). MVPP is allowed to participate in the electricity market;and price information from bulk power market can affect heating system through the coupling devices, thus optimizing the co-operation of electric and heat system. MVPP is also involved in the auxiliary service market, a penalty term is designed for the Utility to charge MVPP service fee so that power fluctuation on transmission line can be reduced. The case study proved the effectiveness of the penalty term and MVPP is able to provide reserve service for Utility in peak load hours by multi-energy flow coupling under the regulation of feed-in tariff. © 2017 IEEE.

关键词： Virtual Power Plants

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Fast Fault Detection and Current Limiting Strategy of HVdc Circuit Breaker

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IOP Conference Series: Materials Science and Engineering 2018年第4期394卷

作者： Wei Li Xueguang Wu Dong Liu Bin Chang Le Zou School of Electronic Engineering North China Electric Power University Changping District Beijing 102206 China State Key Lab of Advanced Power Transmission Technology (Global Energy Interconnection Research Institute Co. Ltd.) Changping District Beijing 102209 China Beijing Key Laboratory of DC Grid Technology and Simulation (Global Energy Interconnection Research Institute Co. Ltd.) Changping District Beijing 102209 China Global Energy Interconnection Research Institute Co. Ltd. Changping District Beijing 102209 China

HVdc transmission has become the most valuable engineering technology because of its own advantages. But the rapid detection and isolation of dc side faults has been one of the major technical matters in the development of dc grids. Highvoltage dc circuit breaker is an important equipment to solve this problem, and becomes the current research hotspot. According to the process of HVdc breaker, this paper analyzes the fault detection and current limiting control of HVdc breakers, and proposes a fault detection method based on ROCOV (Rate Of Change Of Voltage) and a current limiting strategy of operation of arresters by sequence. It can reduce the operation time of the circuit breaker and the peak value of the fault current. Finally, simulation analysis is performed on the PSCAD/EMTdc to verify the correctness of the method.

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An engineering applicable dynamic equivalent method for large-scale AC system connected to VSC-HVdc

An engineering applicable dynamic equivalent method for larg...

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IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)

作者： Lin Zhu Xueguang Wu Dong Liu Global Energy Interconnection Research Institute Beijing China State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of DC grid Technology & Simulation Beijing China

ISBN: (纸本)9781509054190

To test the software and hardware functions of VSC-HVdc control and protection device, an efficient way is to carry out the hardware-in-loop (HIL) tests and setup a detailed AC/dc transient model in real-time digital simulator. However, taking into account capability of the simulator and details of the simulation, the large scale AC network outside the converters should be simplified and equivalent. In this paper, based on a principle that the short circuit levels should be consistent before and after equivalent, a new equivalent method to calculate the equivalent generator parameters for large scale AC power system is proposed. Firstly, rated capacity and access reactance of equivalent generators are calculated according to equivalent bus's short-current. Secondly, a new criterion is provided based on short-current contribution ratio, according to short-current and short-reactance of the equivalent bus. Finally, this criterion is used to choose dominate controller of the equivalent generators, and calculate controller parameters. At the same time, the Ward method is improved. The negative line resistance and generator active output are corrected. Finally, the proposed method is used for Xiamen equivalent grid which derived from a large scale of “Sanhua” China power grids and validated by comparison of the bus voltages, power flows, short-circuit levels and the dynamic response characteristics of the equivalent network, the validity of the proposed method is proved.

关键词： Generators Short-circuit currents Power system dynamics Power conversion Power grids

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Direct heuristic dynamic programming method for power system stability enhancement

Direct heuristic dynamic programming method for power system...

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2014 American Control Conference, ACC 2014

作者： Yu, Miao Lu, Chao Liu, Yongjun School of Mechanical-electronic and Automobile Engineering Beijing University of Civil Engineering and Architecture Beijing 100044 China State Key Laboratory for Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing 100084 China Technology Research Centre of China Southern Power Grid Guangzhou 510623 China

ISBN: (纸本)9781479932726

In this paper a neural network-based approximate dynamic programming method, namely direct heuristic dynamic programming (direct HDP), is applied to power system stability control. Direct HDP is a learning and approximation based approach to address nonlinear system control under uncertainty. In the present paper, real-time system responses provided by wide area measurement system (WAMS) are used to construct such controllers which are uniquely tailored for the problems under consideration. In addition, the controller learning objective is formulated as a reward function that reflects global characteristics of the power system low frequency oscillation under the consideration of coupling effect among system components. The contribution of the paper includes a convergence proof of the direct HDP algorithm using an LQR framework, as well as case study to illustrate the proposed learning control algorithm. The case study aims at providing a new solution to a difficult large scale system coordination problem where the China Southern Power grid is used for. © 2014 American Automatic Control Council.

关键词： Controllers

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Investigation of bipolar block emergency in UHVdc convertor station caused by lightning stroke

Investigation of bipolar block emergency in UHVDC convertor ...

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2012 31st International Conference on Lightning Protection, ICLP 2012

作者： Zhang, Xiao Yu, Zhanqing He, Jinliang Luo, Bin Cai, Hansheng State Key Laboratory of Control and Simulation of Power System and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 100084 China Xipeng Chen Technology Research Centre China Southern Power Grid Co. Ltd Guangzhou Guangdong Province China

ISBN: (纸本)9781467318976

It is noteworthy that bipolar block emergencies of the ±800kV UHVdc system in China happened twice within two years caused by lightning strokes. To recur and investigate the mechanism of such emergencies, lightning transient performance and relative electromagnetic interference (EMI) in the UHVdc system are investigated. Wide-band circuit models of major UHVdc equipments are set for calculation, while the lightning stroke shielding failure process and transmission corona loss are also considered during the simulation. By combining the fault records in the converter station and simulation results , possible ways of EMI into the secondary system produced by primary circuit lightning transient are analyzed. The results would help explain the cause of such bipolar block emergency and provide reference for protection methods of lightning caused EMI in UHVdc system. © 2012 IEEE.

关键词： Lightning

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Tests on electromagnetic environment of ultra HVdc transmission lines in high altitude region

Tests on electromagnetic environment of ultra HVDC transmiss...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Zhanqing Yu Rong Zeng Min Li Ruihai Li Lei Liu Bo Zhang Zheng Zhang Huaying Zhang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China Technology Research Center China Southern Power Grid Company Limited China

ISBN: (纸本)9781424456215

The Ultra High Voltage dc power transmission technique is developed quickly in China but used barely in the world. Corona phenomenon in high altitude region is more serious, and corresponding electromagnetic environment is more severe as well. A UHVdc test lines are completed for tests in Kunming, China, with an altitude of 2100 m. An automotive electromagnetic environment testing system was installed under the line. Measurement of electromagnetic environment was carried out. Radio interference, audible noise, resultant electric field and ion current density at ground level were measured at different voltage from ±800kV to ±1000kV, and atmosphere conditions including sunny, rainy and cloudy weather. The measured result show some difference with those acquired at sea level and is significant for further studies of corona mechanism under high altitude condition. Measured results were compared with the calculated results.

关键词： HVdc transmission Atmospheric measurements Sea measurements Electromagnetic measurements Voltage Corona Power transmission Automotive engineering System testing Electromagnetic interference

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The influence of wind on the audible noise of ultra HVdc transmission line in high altitude area

The influence of wind on the audible noise of ultra HVDC tra...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Min Li Rong Zeng Dawei Yang Zhanqing Yu Ruihai Li Lei Liu Bo Zhang Huaying Zhang State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China Technology Research Center China Southern Power Grid Company Limited China

ISBN: (纸本)9781424456215

The corona performance and the electromagnetic environment of the transmission system has become a crucial issue that has been taken into consideration in the line design, and among which audible noise (AN) is one of the most important factors. The wind in the high altitude area is mostly strong, and could greatly influence the AN. This paper, based on the high altitude HDVC test line, studied the characteristics of AN generated by the transmission line, and analyzed the influence of wind velocity and wind direction on the AN lateral profile.

关键词： Acoustic noise HVdc transmission Testing Wind speed Corona Power transmission lines Microphone arrays Voltage Electromagnetic compatibility Power engineering and energy

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Radio interference of Ultra HVdc transmission lines in high altitude region

Radio interference of Ultra HVDC transmission lines in high ...

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Asia-Pacific Symposium on Electromagnetic Compatibility (APEMC)

作者： Zhanqing Yu Rong Zeng Min Li Ruihai Li Lei Liu Dawei Yang Zheng Zhang Bo Zhang Feng Tian State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing China Technology Research Center China Southern Power Grid Company Limited China

ISBN: (纸本)9781424456215

Corona phenomenon of Ultra High Voltage dc in high altitude region is more serious, and corresponding electromagnetic environment is more severe as well. Radio Interference is the most important consideration during the design and operation. Characteristics of RI and its influence factors were studied based on an UHVdc test line with an altitude of 2100 m in the National Engineering laboratory for UHV technology, located in Kunming, China. The measuring system of RI long term tests was introduced. Lateral and longitudinal distribution and spectrum of RI near the transmission line were analysed at various voltages, weather conditions.

关键词： Electromagnetic interference HVdc transmission Voltage Corona Testing Power transmission lines dc generators Conductors Transmission line measurements Electromagnetic compatibility

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