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A Reliability Index Deviation Allocation Method for Distribution System with Distributed Generation

A Reliability Index Deviation Allocation Method for Distribu...

引用

Energy Engineering and power Systems (EEPS), International Conference on

作者： Yangjun Zhou Juntao Pan Wei Zhang Chenying Yi Weixiang Huang Shan Li Bin Feng Yuanchao Zhou Lifang Wu Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning China Guangxi Power Grid Co. Ltd. Nanning China Nanning Power Supply Bureau of Guangxi Power Grid Co. Ltd. Nanning China

ISBN: (数字)9798350375138

ISBN: (纸本)9798350375145

The access of distributed generation will increase the complexity of reliability evaluation, which will affect the accuracy of theoretical reliability evaluation value. Therefore, it is necessary to allocate the deviation between the true value and the theoretical value of the reliability index to the parameters of each component, and to correct the parameters purposefully that are allocated to more deviations. In this paper, firstly, the reliability model of distributed generation is established. Then, the improved proportional allocation method is used to calculate the contribution rate of each parameter to the system index, and the index deviation is allocated based on this. Next, after eliminating the parameters that contribute more to the deviation, the values of these parameters are calculated inversely through establishing the optimization model by using the known system reliability indexes, realizing the correction of the parameters. Finally, a distribution system for RBTS Bus 6 is introduced as standard case to demonstrate the accuracy of the proposed method.

关键词： Accuracy Optimization models Reliability theory Maintenance engineering Transformers Distributed power generation power system reliability Indexes Resource management Standards

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A capacitor-type DC circuit breaker for offshore all-DC grids

A capacitor-type DC circuit breaker for offshore all-DC grid...

引用

Energy, power and Electrical Engineering (EPEE), International Conference on

作者： Qianqian Xu Qihui Liu Xipeng Cai Yihua Zhu Chao Luo State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (数字)9798331518066

ISBN: (纸本)9798331518073

Full DC of offshore wind farms is the future development trend of large-scale offshore wind farms, however, the probability of DC line faults is high, and the use of DC circuit breakers can realise the fault ride-through of offshore full DC wind farms, improve the safe operation of the system during faults, and is one of the mainstream solutions to realise DC fault isolation. In this paper, a capacitive DC circuit breaker suitable for offshore full DC grid is proposed, which can effectively suppress the fault current by introducing a current limiting device. The topology and working principle of this circuit breaker are analysed, and the circuit breaker fault handling process is theoretically analysed. Finally, for the single-end equivalent system using capacitor-type DC circuit breaker, a simulation model is established in Matlab/Simulink software for verification, and the simulation results show that the proposed circuit breaker has a better current limiting effect and has the ability to isolate faults quickly.

关键词： Thyristors Limiting Circuit breakers Simulation Wind farms Software Topology Circuit faults Fault currents Switching circuits

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Study on Influencing Factors of Bidding Strategy in power Market

Study on Influencing Factors of Bidding Strategy in Power Ma...

引用

Asia Conference on Energy and Environment Engineering (ACEEE)

作者： Xinlei Cai Jiale Liu Zijie Meng Zhangying Cheng Ke Li Tingzhe Pan Power Dispatching and Controlling Center of Guangdong Power Grid Company Limited Guangdong China P.R. Guangdong Provincial Key Laboratory of Intelligent Measurement and Advanced Metering of Power Grid Institute of Measurement Technology China Southern Power Grid Electric Power Research Institute CO. Ltd Guangdong China

With the continuous and in-depth reform of the domestic electricity market, a large number of electricity-selling companies participate in the competition of the electricity market. To enhance the core competitiveness of power-selling companies and reduce their operational risks, it is necessary to analyze the factors that affect the bidding decisions of power-selling companies, so that formulates reasonable bidding strategies and promotes the benign development of the company. Therefore, according to combing and summarizing the relevant literature, this paper analyzes the factors that affect the bidding strategy of power sales companies from four perspectives, i.e., operating objectives, policies and systems, market risks, and internal conditions of power sales companies, and constructs an evaluation system of influencing factor indicators. Finally, the analytic hierarchy process (AHP) modified based on the entropy weight method is applied for example analysis. By determining the weight of indicators at all levels, the ranking of factors affecting the bidding strategy of power-selling companies is obtained, with a view to providing a reference for power-selling companies to formulate bidding strategies suitable for their own development.

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Pilot Protection of AC Transmission Line for DFIG Wind Farm Based on Maximum Mean Discrepancy

Pilot Protection of AC Transmission Line for DFIG Wind Farm ...

引用

power and Energy Engineering (ICPEE), International Conference on

作者： Xiangyu Lin Xuanren Meng Xiaoming Wang Junyang Tian Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning China Power Dispatch and Control Center Guangxi Power Grid Co. Ltd. Nanning China

After the fault occurs on the transmission line of the wind farm, under the current limiting control of the doubly fed induction generator (DFIG) converter, the short-circuit current on the farm side presents the characteristics of limited amplitude, frequency offset, and phase angle distortion, which will reduce the performance of the traditional pilot protection. In addition, considering the short-circuit current of the grid side is mainly generated by the synchronous generators and appears as the attenuated power frequency sinusoidal characteristic, the short-circuit currents on both sides of the transmission line show a significant difference in waveform shape. Therefore, a pilot protection based on the maximum mean discrepancy is proposed by using the waveform difference of the short-circuit current. Extensive simulation results show that the proposed pilot protection in this paper has fast operation speed and high sensitivity, and it can still operate reliably under the influence of interference factors such as fault resistance.

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An Efficient power System Risk Identification Method Considering PMU Bad Data

An Efficient Power System Risk Identification Method Conside...

引用

Sustainable power and Energy Conference (iSPEC)

作者： Yin Wang Jieling Li Mingshun Liu Dongxu Chang Lingzi Zhu Liweiyong Guo Power Dispatching Control Center of Guizhou Power Grid Co. Ltd Guiyang China School of Electrical Engineering Chongqing University Chongqing China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

The phasor measurement unit (PMU) is widely employed in modern power systems, which enables real-time power system status monitor and risk identification. However, the bad data caused by PMU failure may mislead the risk identification. This paper proposes an efficient power system risk identification method considering PMU bad data. First, this paper describes the risk identification problem based on the analysis of the characteristics of PMU bad data and the power system contingency events. Then, the Teager-Kaiser energy operator with the 3Sigma criterion is proposed for the initial PMU anomaly data screening. Next, based on the difference between the bad data and the contingency events, the Pearson correlation coefficient is adopted for the calculation of the spatial similarity. Finally, a local outlier probability algorithm is presented to analyze the metrics. Case studies are carried out on IEEE 39 and IEEE 118 systems. Results demonstrate that the proposed method has an efficient risk identification accuracy with PMU abnormal data.

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Cyber-Attack Risk Assessment and Prevention Strategy of Substations Based on Dynamic Attack and Defense Game

Cyber-Attack Risk Assessment and Prevention Strategy of Subs...

引用

power System and Green Energy Conference (PSGEC)

作者： Feng Lin Yong Mei Yihua Zhu Dongxu Chang Ren Liu Hengdao Guo Power Dispatch and Control Center China Southern Power Grid GuangZhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid GuangZhou China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid GuangZhou China CSG Key Laboratory for Power System Simulation China Southern Power Grid GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation & Control for New Energy Power System GuangZhou China

With the improvement of the informatization of the power system, the risk of cyber attack is also increasing. This paper proposes a risk assessment and prevention strategy for cyber attack against substations. Firstly, the cyber attack against substations are modeled based on the game theory of dynamic attack and defense. Secondly, an improved OPA (ORNL-PSERC-Alaska) model is utilized to analyze the cascade failure after cyber attacks and quantify the load loss of power system. Finally, a preventive strategy which can mitigate the expectation load loss caused by cyber attack against substations is put forward. Simulation experiments were conducted to validate the effectiveness of the proposed method.

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Multi-Component Mixed Oil with Transformer Typical Material Compatibility Analysis

Multi-Component Mixed Oil with Transformer Typical Material ...

引用

power Engineering (ICPE), International Conference on

作者： Ying Liu Guofeng Fu Hongwei Li Wenyu Ye Yekang Qin Zhijian Huang Liangyuan Chen Guigang Power Supply Bureau Guangxi Power Grid Co. Ltd. Guigang China State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing China Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Nanning China

ISBN: (数字)9798331531140

ISBN: (纸本)9798331531157

Mixed insulation oil can complement the performance advantages of different oils and can be directly applied to existing mineral oil transformers without changing the transformer structure, which is an important development direction of high voltage and large capacity transformers. The compatibility study of mixed insulation oil and typical transformer materials has important significance for transformer design and operation. In this paper, we investigated the compatibility of multi-component mixed oil (MCMO) with typical transformer materials, and analyzed the changes in color, viscosity, relative dielectric constant, dielectric loss factor, volume resistivity, breakdown voltage, acid value, and interfacial tension parameters of MCMO before and after thermal aging. The results show that the MCMO has good compatibility with iron block, silicon steel sheet, enameled wire and epoxy plate, and the MCMO showed remarkable stability in kinematic viscosity, relative dielectric constant and breakdown voltage. But it has some compatibility problem with nitrile rubber.

关键词： Viscosity Dielectric constant Oils Oil insulation Market research Stability analysis Thermal analysis Rubber Thermal stability power transformer insulation

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Optimization Strategy for Virtual Energy Storage of Electric Vehicles to Participate in Multiple Ancillary Services

Optimization Strategy for Virtual Energy Storage of Electric...

引用

Clean Energy and Electric power Engineering (ICCEPE), International Conference on

作者： Qi Guo Haohan Gu Yifei Zhao Liang Tu Qifang Chen Haiqing Cai Wei Chen Zhihao Chen Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China School of Electrical Engineering Beijing Jiaotong University Beijing China

ISBN: (数字)9798350390315

ISBN: (纸本)9798350390322

When EVs participate in multiple ancillary services of the power grid, due to the lack of a unified management scheduling plan, various ancillary service demands compete for limited energy storage resources. This would lead to conflicts when the virtual energy storage of EV participates in the regulation of multiple ancillary services. In order to solve the above problems, a reasonable and feasible optimization strategy for virtual energy storage of EVs is formulated to alleviate the conflict problems of ancillary services. The validity of the proposed method is verified by simulation cases.

关键词： Economics Green energy Electric vehicles Linear programming Regulation power grids Optimization Frequency control Energy storage

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Electricity and Heat Load Forecasting for Integrated Energy System Based on Variational Modal Decomposition and Deep Neural Networks

Electricity and Heat Load Forecasting for Integrated Energy ...

引用

Electrical Engineering and control Science (IC2ECS), International Conference on

作者： Shuibin Hu Xiangyu Kong Delong Zhang Dahua Li Xianxu Huo Chao Pang Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin University of Technology Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Tianjin Electric Power Company Electric Power Research Institute Tianjin China

ISBN: (数字)9798331510107

ISBN: (纸本)9798331510114

Load forecasting is crucial for the optimal scheduling of integrated energy systems(IES). With the increasing complexity of system load due to demand diversification and load coupling, this paper proposes a method for electricity and heat load forecasting based on Variational Mode Decomposition(VMD) and Deep Neural Networks . First, VMD decomposes the loads into components with different central frequencies, providing more stable load eigenmode functions. Then, a hybrid model combining Convolutional Neural Networks(CNN) and Long Short-Term Memory networks(LSTM) is used to extract time-series features, with parameter optimization performed using the Salp Swarm Algorithm(SSA). A case study of a real IES demonstrates the model's superior predictive performance.

关键词： Couplings Accuracy Load forecasting Electricity Predictive models Feature extraction Stability analysis Forecasting Resistance heating Load modeling

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Transient Fault Current Calculation Method of Photovoltaic grid-Connected System Considering the Dynamic Response of Phase-Locked Loop

Transient Fault Current Calculation Method of Photovoltaic G...

引用

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

作者： Rui Mu Jiawei He Bin Li Wenbo Wang Cheng Yao Yongwu Zhang Key Laboratory of Smart Gird of Ministry of Education Tianjin University Tianjin China Electric Power Research Institute State Grid Tianjin Electric Power Company Tianjin China Electric Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China

The transient fault characteristics of photovoltaic (PV) grid-connected system depend on the dynamic response of each control link. Phase-locked loop (PLL) plays an important role in PV grid-connected system. The dynamic output response of PLL affects the PV transient fault characteristics through coordinate transformation. Existing calculation method for PLL dynamic response is based on the premise that the voltage phase change at the point of common coupling (PCC) is small and the steady-state phase after the fault can be measured, and the calculation error of transient current is large. To accurately describe the PV transient fault characteristics, this work proposes a calculation method of PV transient fault current by considering the dynamic response of PLL. First, the dynamic characteristics of the current inner loop are analyzed in detail, and the transient fault current of $\boldsymbol{d}-\boldsymbol{q}$ axis is calculated. Second, the accurate calculation model of the dynamic response of PLL is established, and the dynamic output of PLL is obtained. The transient fault current calculation model considering the dynamic response of PLL is finally established. Compared with existing calculation method for transient fault current, the proposed method accurately describes the dynamic response characteristics of PLL and the PV transient current change characteristics. Finally, simulation analysis based on PSCAD/EMTDC verifies the accuracy of the proposed method.

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