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Fuzzy Adaptive PI Circulating Current Suppressing control for MMC-HVDC

Fuzzy Adaptive PI Circulating Current Suppressing Control fo...

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IEEE Information Technology, Networking, Electronic and Automation control Conference

作者： Wujie Chao Junwei Huang Chaoping Deng Liyu Dai State Grid Fujian Electric Power Research Institute Fuzhou China Fujian Key Laboratory of Protection and Operation Control for Smart Grid China

Recent years, modular multilevel converter (MMC) is one of the most promising topologies applied to high voltage direct current transmission (HVDC). In order to solve the circulating currents caused by structural defects of MMC, a fuzzy adaptive PI circulating current suppressing controller is proposed based on mathematical model of MMC and functioning fuzzy subset inference method: The fuzzy number is calculated according to the error of system state, error variation, membership function and fuzzy control rules; The center of gravity method is used for defuzzification, and finally the PI parameters are modified. Finally, the PSCAD/EMTDC simulation model with fuzzy adaptive PI controller is established. The results show that the fuzzy adaptive PI circulating current suppressing controller is effective for MMC-HVDC.

关键词： Adaptation models Multilevel converters PI control HVDC transmission High-voltage techniques Mathematical models Stability analysis

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Active Distribution Network Secondary Coordinated Voltage control Based on Multi-Objective Linear Programming

Active Distribution Network Secondary Coordinated Voltage Co...

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“紫金论电”2017智能电网保护和运行控制国际学术研讨会

作者： LU Wen TU Mengfu DING Qia DU Hongwei NARI Group Corporation(State Grid Electrical Power Research Institute) NanjingChina211106 NARI Technology Co. Ltd.Nanjing211106 State Key Laboratory of Smart Grid Protection and Control NanjingChina211106

Distribution network with a large number of distributed generators(DG)puts forward higher requirements for coordinated control of voltage and reactive *** coordinated voltage control is an effective method to improve distribution network voltage level under the condition of high permeable *** on the basic principle of the secondary coordinated voltage control,multi-objective linear programming method is used to solve the contradiction between the safety and the economy of the distribution network,and the optimization goal construction,control strategy selection and control process realization are introduced *** simulation results show that the secondary coordinated voltage control based on multi-objective programming can be used to solve distributed network voltage stability,but also can improve the efficiency of ADN.

关键词： Active distribution network Secondary voltage control Multi-objective linear programming

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A quantitative evaluation method for the performance of primary frequency regulation of system resources

A quantitative evaluation method for the performance of prim...

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International Conference on Electronics Technology (ICET)

作者： Wu Xuelian Liu Fusuo Huang Hui Zhang Hongli Li Wei Power Grid Analysis and Consulting Department NARI Group Corporation/State Grid Electric Power Research Institute Nanjing China State Key Laboratory of Smart Grid Protection and control NARI Group Corporation/ State Grid Electric Power Research Institute Nanjing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

With large scale new energy power being connected to the grid, the frequency support capability of the system decreases gradually. In order to meet the regulation requirements of system frequency stability and lay the foundation for frequency stability coordination and optimization control, it is necessary to use reasonable quantitative evaluation indicators for primary frequency regulation performance. Firstly, the dynamic response characteristics of frequency modulation resources in load fluctuation scenarios and large power disturbance scenarios are analyzed separately. Then, by mastering the frequency response characteristics of the system considering primary frequency regulation in different scenarios, the key factors affecting the safety and stability characteristics of the system frequency are determined. Finally, a quantitative evaluation method for the primary frequency regulation performance of frequency modulation resources is proposed, and the applicability of the proposed evaluation method is verified based on typical scenario examples.

关键词： Performance evaluation Frequency modulation Power system dynamics Power system stability Stability analysis Regulation Power grids

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A Coupled RTK/INS Positioning Method Based on Robust Estimation

A Coupled RTK/INS Positioning Method Based on Robust Estimat...

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第十四届中国卫星导航年会

作者： Huizhen Yu Xianliang Teng Shuguo Pan Min Zhang Jian Shen Wang Gao School of Instrument Science and Engineering Southeast University State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation

In the urban environment,the positioning results of RTK/INS integrated navigation are often influenced by grosses,which degrades the positioning accuracy and damages the stability of the navigation *** solve this dilemma,a loose coupled RTK/INS positioning method based on robust estimation is ***,during RTK positioning,for eliminating corrupted measurements caused by Non-Line-of-Sight(NLOS) signals and multipath,this paper researches the RTK positioning algorithm based on bifactor robust *** this method,the ambiguity is fixed and solved back into the Double-Difference(DD) equation in least square *** posterior residual vector is used for the bifactor robust processing to eliminate the influence of some abnormal ***,the RTK positioning results are loosely integrated with Inertial Navigation System(INS),and the robust processing based on Huber equivalent weight function is implemented in the process of the Kalman filter ***,the proposed algorithm is validated by vehicle data in a typical urban *** experimental results show that compared with the traditional least squares-based RTK,the accuracy of the bifactor RTK method is improved by 2.48 cm in the horizontal ***,in contrast with the RTK/INS method based on the single robust processing,the accuracy of the proposed robust bifactor error method in the horizontal direction is increased by 3.85 *** navigation accuracy and reliability are significantly *** dynamic environment,this research has certain theoretical reference and practical value for vehicular and autonomous driving applications.

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Evaluation Methods for the Degree of Interaction and Coupling between New Energy and DC

Evaluation Methods for the Degree of Interaction and Couplin...

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International Conference on Electronics Technology (ICET)

作者： Wu Xuelian Liu Fusuo Li Zhaowei Zhang Hongli Lai Yening Power Grid Analysis and Consulting Department NARI Group Corporation/State grid electric power research institute Nanjing China State Key Laboratory of Smart Grid Protection and control NARI Group Corporation/ State grid electric power research institute Nanjing China

ISBN: (数字)9798350363951

ISBN: (纸本)9798350363968

The high proportion of new energy connected to multi-infeed direct current power system may cause large-scale new energy to enter low voltage ride-through and multiple DC commutation failures under severe grounding faults, and the interactive coupling effect may affect the subsequent recovery process. In response to this phenomenon, interactive indicators are proposed to evaluate the risk of simultaneous faults between DC and new energy during grounding faults, as well as coupling indicators to evaluate the risk of secondary faults during the recovery process of DC and new energy after grounding faults are cleared. Simulation analysis based on actual power grids shows that this indicator can evaluate the interactive coupling process between new energy low voltage ride-through and DC commutation failure intuitively.

关键词： Couplings Low voltage Time-frequency analysis Grounding Electric shock Voltage Power system stability

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Optimal Scheduling of Thermoelectricity in Integrated Energy System Based on Waste Heat Recovery from Power to Gas and Flexible Thermoelectricity Ratio

Optimal Scheduling of Thermoelectricity in Integrated Energy...

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

作者： Dongmei Yang Yu Gao Qi Wang Yan Chen Yuchen Guo Meng Wang the State Key Laboratory of Smart Grid Protection and Operation Control Nari Technology Co. Ltd. Nanjing China School of Nari Electric and Automation Nanjing Normal University Nanjing China

Aiming at the anti-peak shaving characteristics of wind power and the problem of wind curtailment caused by the ‘fixing electricity by heat’ of CHP units, an optimal scheduling method in integrated energy systems based on waste heat recovery from power to gas(P2G) and flexible thermoelectricity ratio in CHP is proposed. First, the P2G energy coupling mechanism and the feasibility of P2G waste heat recovery and utilization are analyzed. P2G equipment is introduced into the system and the remaining heat is recycled and utilized to promote wind power grid-connected consumption. Then, the principle of flexible thermoelectric ratio adjustment of CHP is analyzed, so that CHP can adjust the thermoelectric ratio following the trend of wind power output and the energy supply pressure of electric heat load, so as to improve the wind power consumption capacity of the system. Finally, the optimal scheduling model of the integrated energy system is constructed with the goal of minimizing the daily operating cost. The simulation example shows that the proposed scheduling method optimizes the thermoelectric coupling relationship of the system, effectively improves the wind power absorption capacity of the system, and has good social and economic benefits.

关键词： Couplings Cogeneration Optimal scheduling System integration Wind power generation Waste heat Heat recovery

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Performance Analysis of Robust Tightly Coupled GNSS/INS Integration Positioning Based on M Estimation in Challenging Environments

Performance Analysis of Robust Tightly Coupled GNSS/INS Inte...

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第十三届中国卫星导航年会

作者： Yingying Jiang Shuguo Pan Qian Meng Min Zhang Wang Gao Chun Ma School of Instrument Science and Engineering Southeast University State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation

The phenomena of limited satellite visibility and multipath is serious in challenging environments,which causes to decrease of the positioning accuracy *** effective solution is tightly coupled integration of Global Navigation Satellite Systems(GNSS) and Inertial Navigation System(INS) based on robust M ***,the robust performance is directly influenced by both the selection of equivalent weight functions and the INS accuracy *** this paper,theoretical analysis and experiment validation of positioning accuracy and reliability for the robust integration system are implemented under the condition of various equivalent weight functions and different INS ***,for constructing equivalent least square form of EKF,we combine classical EKF observation equation with redundant observation equation established by predicted state and corresponding covariance in propagation ***,robust extended Kalman filter(REKF) algorithm which is based on M estimation is introduced for purpose of weakening the influence of faults on ***,the features of three typical equivalent weight functions(Huber,Tukey,IGG-Ⅲ) are analyzed ***,a simulation experiment platform is built to analyze the influence of the choice of equivalent weight functions and the IMU grades on positioning accuracy and reliability,which is realized by integrating GNSS and various grades IMU to locate with three REKF solutions against traditional *** experimental results show significant enhancements for REKF based on M estimation in terms of precision and reliability of tightly coupled ***,in the setting failure scenario,the solution scheme based on IGG-Ⅲ equivalent weight function can obtain the optimal robust effect in comparison with REKF(Huber) and REKF(Tukey),whose horizontal positioning accuracy is kept within-0.5 m ～ 0.5 m and vertical positioning accuracy is no more than 1 ***,compared with consumer grad

关键词： Extended Kalman Filter Equivalent Least Square M Estimation Equivalent Weight Function INS

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Research on Hybrid Active Power Filter and Its control and protection System for LCC-HVDC

Research on Hybrid Active Power Filter and Its Control and P...

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IEEE Joint International Information Technology and Artificial Intelligence Conference (ITAIC)

作者： Wujie Chao Liyu Dai Junwei Huang Mingquan Chen State Grid Fujian Electric Power Research Institute Fuzhou China Fujian Key Laboratory of Protection and Operation Control for Smart Grid Fuzhou China

Filters are key equipment in LCC-HVDC projects. It filters out characteristic harmonics generated by the converter and prevents the effect of harmonics generated by converters on the AC power grid. Currently, most DC transmission projects use passive filters. The first use of hybrid active power filters in the Fujian Guangdong DC interconnection project º This paper introduces the application framework, theory, control and protection system design of hybrid active power filters in LCC-HVDC projects.

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Frequency Regulation Market Performance Considering the Complementarity of Wind Park Cluster

Frequency Regulation Market Performance Considering the Comp...

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

作者： Zirui Huang Jiangfeng Zhang Xianliang Teng Kaifeng Zhang School of Automation Southeast University Nanjing China State Grid Zhejiang Electric Power Research Institute Zhejiang China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (State Grid Electric Power Research Institute) Nanjing China

Modern power systems with high penetration of renewable energy enrich the frequency regulation resources by offering more new clean wind and solar energy. In this paper, we present a bottom-top design of wind park’s participation in the frequency regulation market considering the complementarity of wind park power outputs. By defining a quantitative complementarity index, we show how the complementarity contributes to the regulation reserve reliability of wind parks and the consistent market performance, and verify the conclusions via numerical analysis.

关键词： Wind Renewable energy sources Wind energy System integration Solar energy Regulation Power system reliability

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High accurate estimation method of sub-synchronous oscillation parameters on PMU

High accurate estimation method of sub-synchronous oscillati...

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“紫金论电”2017智能电网保护和运行控制国际学术研讨会

作者： TAN Yong WANG Meng SHEN Jian ZHANG Min HOU Mingguo Nari Group Corporation(State Grid Electric Power Research Institute) Nanjing 21106China NARI Technology Development Co.Ltd Nanjing 211061China State Key Laboratory of Smart Grid Protection and Control Nanjing 210061China

With the rapid development of renewable energy power generations,AC/DC transmissions and static compensations etc,power electronic technology has been widely applied in power *** traditional power equipment is replaced by a large number of power electronic devices,the disturbances such as harmonic interference and sub-synchronous oscillation are more *** order to detect the sub synchronous oscillation in power system in time,and take measures to ensure the safety and stability of power system,this article analyses the algorithm principle of the PMU and the communication architecture of WAMS/PMU *** to the IEEE Std C37.118-2011 standard,it elaborates the problems and the limitations existing in the monitoring of sub-synchronous and super-synchronous harmonic parameters on *** the basis of the above,a method of on-line identification and alarm for the sub-synchronous and super-synchronous harmonic parameters on PMU device is *** with FFT spectrum correction theory,the high accuracy identification method of distributed sub synchronous and super synchronous harmonic parameter is *** feasibility and accuracy of the method is verified by simulation experiments.

关键词： sub-synchronous oscillation amplitude ratio method phasor measurement unit(PMU) FIR Filters

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