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

作者： Liang Huang Hao Chen Yanbing Jia Feng Tian Yun Bai Mengdie Li Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China State Grid Shanxi Electric Power Company Taiyuan Power Supply Company Taiyuan China Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434263

The large-scale access of renewable energy sources such as wind power will affect the operation and dispatch of the power system, and will affect the safe and stable of the power grid. The ESS has the ability to respond quickly, which can reduce the impact of wind power on the grid. Based on a hybrid energy storage with a certain capacity, a corresponding rolling optimization control strategy is proposed. Using batteries and super capacitor as energy storage media, an optimal control model targeting the state of charge of the hybrid energy storage system is established, and the solution is solved by a particle swarm optimization algorithm. The simulation example shows that a HESS with a certain capacity on the generation side can achieve a smooth grid connection. The control strategy proposed in this paper extends the service life of the battery.

关键词： Renewable energy sources power supplies Capacitors Optimal control system integration Wind power generation Wind farms

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Harmonic Current Detection and Reactive power Compensation Method for Photovoltaic system Based on FBD Method

Harmonic Current Detection and Reactive Power Compensation M...

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

作者： Lifeng Liu Dong Xie Duo Zhao Yanbing Jia Yongjun Yu Qiang Fan Yong Shen Weiwen Qi State Grid Shaoxing Power Supply Company Shaoxing China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China Shaoxing Jianyuan Power Group Co. Ltd Shaoxing China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

In order to improve the equipment utilization of distributed photovoltaic power generation system, the harmonic and reactive currents generated by grid-connected photovoltaic system can be accurately detected and compensated. A phase-locked loop based on second-order generalized integrator (SOGI-PLL) is introduced into the traditional FBD current detection method to separate the positive and negative sequence components of unbalanced voltage and detect the phase and frequency of reference voltage more accurately. The simulation results show that the algorithm can reduce the computational complexity and increase the detection accuracy and steady-state performance.

关键词： Harmonic analysis power harmonic filters Photovoltaic systems Phase locked loops Reactive power

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Experimental study on thermal catalytic degradation of SF6 waste gas by phosphate and metal oxides 7

Experimental study on thermal catalytic degradation of SF6 w...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Hao, Xiong Wenjiang, Li Hang, Liu Yi, Wang Xiaoxing, Zhang Maintenance Branch State Grid Chongqing Electric Power Company Chongqing China Hubei Key Lab. for High-efficiency Utiliz. of Solar Ener. and Oper. Control of Energy Storage System Hubei University of Technology Wuhan China

ISBN: (纸本)9781728155111

The SF6 abatement strategies had received special attention due to the fact that SF6has very high global warming potentials and long atmospheric lifetime. The use of degradation method can effectively eliminate the greenhouse effect caused by SF6 exhaust gas. In this paper, Zr(PO4)4, AlPO4, NiO and FeO4 were used as catalysts to degrade SF6 gas (the volume ratio of SF6 was 15% and the background gas was air) at 800 ?. The concentration of SF6 gas was detected by gas chromatograph to obtain degradation rate, the partial degradation products of SF6 gas were quantitatively analyzed by gaschromatograph-mass spectrometer, and the main products detected were SOF, SOF and SO gas. Comparing the product formation characteristics of four groups of test products when phosphate and metal oxide were used as catalysts, the gas production of SO was the most at the same temperature. When Zr(PO4)4 and AlPO4 were used as catalyst, the SOF gas production reached dynamic equilibrium at 31300ppm and 2385ppm respectively after heating for 4h, and the generated SOF gas presented a linear growth. When NiO and Fe3O4 were used as catalyst, SOF and SOF gases were both linearly increased. When Zr(PO4)4 was used as catalyst, compared with other catalysts, the amount of SOF produced was the largest. NiO had a good catalytic effect, and the degradation rate of SF6 gas reached 27.07% within 12h. The main decomposition products were SOF, SOF and SO gas, which could be filtered out by lye, which was of great significance for reducing greenhouse gas caused by SF6 exhaust gas emissions. © 2020 IEEE.

关键词： Sulfur hexafluoride

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Summary of Energy Storage systems and Renewable Energy Participation in AGC Research

Summary of Energy Storage Systems and Renewable Energy Parti...

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

作者： Caiming Yang Hongfei Tao Xinrui Song Yanbing Jia Dong Xie Weiwen Qi Yongjun Yu Feng Zhao State Grid Shaoxing Power Supply Company Shaoxing China Shaoxing Jianyuan Power Group Co. Ltd. Shaoxing China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

With the scarcity of fossil energy, the development of renewable energy is becoming more and more rapid. However, when new energy is integrated into the power grid, the inertia of the system is reduced and the stability of the system is lowered. This also poses a new challenge to frequency control, and energy storage as a technology that can quickly respond to system frequency changes is now widely concerned. This paper summarizes the domestic and international research status of energy storage and AGG capacity allocation and coordinated control through the influence of renewable energy on AGC. Finally, the development prospects of energy storage and participation in new energy integration into the power grid are prospected.

关键词： Frequency control Renewable energy sources Batteries Automatic generation control power grids

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Low-carbon Economic Dispatch of Integrated Energy system Considering Hydrogen Mixing in Natural Gas Pipeline

Low-carbon Economic Dispatch of Integrated Energy System Con...

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

作者： Dong Xie Lihong Kang Yanbinz Jia Hao Chen Feng Tian Yun Bai Baifu Zhang Xuan Cui State Grid Shaoxing Power Supply Company Shaoxing China Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China State Grid Shanxi Electric Power Company Taiyuan Power Supply Company Taiyuan China

ISBN: (纸本)9781665434263

With the rapid growth of the penetration rate of renewable energy, the construction of Integrated electricity-natural gas system (IEGS) has important economic and environmental significance. power-to-gas (P2G) technology, as a new energy conversion and storage method, provides an important way for wind power consumption. Due to the limited local consumption of hydrogen energy and difficulty in exporting, this paper proposes an IEGS optimal scheduling model that considers hydrogen mixing in natural gas pipeline and aims at the lowest system operating cost. After the verification of the improved IEEE 14-node power network and the Belgian 20-node natural gas network coupling system, the operation mode of the IEGS proposed in this paper can expand the hydrogen demand, increase the hydrogen transmission capacity, and promote wind power consumption. At the same time, it can achieve carbon emission reduction and improve the economics of system operation.

关键词： Renewable energy sources systems operation Hydrogen Pipelines Energy conversion Carbon dioxide system integration

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Series-Connected SiC MOSFETs Module with a Single Gate Driver

Series-Connected SiC MOSFETs Module with a Single Gate Drive...

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

作者： Yuxuan Zhang Rui Li Runquan Meng Yuhan Ren Yue Ma Juan Chen Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China Electric Power Research Institute of State Grid Shanxi Electric Power Company Taiyuan China

With the continuous development and progress of power electronics technology, the technological innovation of each generation of power semiconductors will have a profound impact on the generation, transmission, conversion and distribution of electrical energy, and has made outstanding contributions to the advancement of human civilization and economic and social development. In recent years, a new generation of wide-bandgap semiconductor power devices has developed vigorously, and new material switching devices such as SiC and GaN MOSFET have entered people's field of vision, which has brought new historical opportunities for the performance improvement of power electronic equipment, as well as new challenges. This paper presents a series-connected SiC MOSFET switching module topology with a single gate driver. Then, the working principle including static state and switching transition is analyzed. The LTspice simulations in the third section validate the analysis and show the usability of the series-connected SiC MOSFET stack topology using a single gate driver.

关键词： MOSFET Technological innovation Silicon carbide Switches system integration Logic gates Gate drivers

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A Protection Scheme for Low Voltage DC Distribution system Based on control and Protection Cooperation

A Protection Scheme for Low Voltage DC Distribution System B...

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Smart power & Internet Energy systems (SPIES), International Conference on

作者： Qiang Liu Shengwen Li Runquan Meng Jingchong Huo Shaozhe Jiang Ruishu Li Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China Electric Power Research Institute of State Grid Shanxi Electric Power Company Taiyuan China

When a short circuit fault occurs in the DC distribution system, the fault current rises quickly and has a high amplitude, which requires high performance of the protection equipment. At present, the protection scheme of DC distribution system mainly depends on the DC circuit breaker at both ends of the line, but the DC circuit breaker technology is not mature and the cost is high. Based on the above background, a protection scheme of low-voltage DC distribution system based on control and protection cooperation is proposed. By changing the system topology and cooperating with the implementation of the protection scheme, it can meet the protection reliability and rapidity, reduce the operation cost, and quickly restore the power supply after cutting off the fault, so as to realize the short-term fault traversal. Finally, the system model is built on the Matlab.Simulink simulation platform to verify the effectiveness of the protection scheme.

关键词： Low voltage Costs power supplies Circuit breakers control systems Topology Circuit faults

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Impact of electromechanical coupling on shaft torsional dynamics

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Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering 2010年第4期30卷 49-55页

作者： Chen, Wu-Hui Bi, Tian-Shu Yang, Qi-Xun Peng, Qian Key Lab. of Power System Protection and Dynamic Security Monitoring and Control Ministry of Edu. North China Electric Power University Beijing 102206 China State Nuclear Electric Power Planning Design and Research Institute Beijing 100094 China

The electromechanical coupling model is employed to define the all-mode shape and torsional mode shape, and deduce the linear solutions of torques. Based on the solutions of torques, mode shapes of torques and mode contribution factors of torques are defined. The above physical concepts can directly describe shaft torsional dynamics, and get more insights than the mode shapes previously defined. Moreover, the theoretical basis and the physical implications of free vibration and forced vibration models are analyzed in detail. In light of the difference between the electromechanical coupling model and the free vibration model, the deviations between the calculated and measured values are explained for mode shapes and natural torsional frequencies. The difference between the dynamics of the electromechanical coupling and forced vibration models is analyzed as well. © 2010 Chin. Soc. for Elec. Eng.

关键词： Electromechanical coupling

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Analysis of Fault Characteristics of Half-wavelength AC Transmission Lines

Analysis of Fault Characteristics of Half-wavelength AC Tran...

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IEEE power and Energy Society General Meeting

作者： Teng Feng Xinzhou Dong Bin Wang Shenxing Shi Shuxin Luo Aoyu Lei Lanxi Tang State Key Lab. of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Tsinghua University

ISBN: (纸本)9781509041695

Half-wavelength AC transmission (HWACT) is an ultra-long distance AC transmission technology, whose electrical distance is close to half-wavelength at the system power frequency. The countries with a large territory have a big demand for HWACT. The fault characteristics of an HWACT line can be different from those of a conventional transmission line. So it is necessary and significant to analyze the fault characteristics of an HWACT line. In this paper, the influence of fault distances and fault resistances on the fault voltages and currents of two buses is analyzed after different types of faults occur on an HWACT line. And the analysis results are compared with the simulation results from EMTP.

关键词： Fault characteristics Fault distance Fault resistance Fault type Half-wavelength AC transmission fault resistance half-wave AC power transmission faults electrical distance power frequency Electromagnetic Transients Program fault signature Analysis

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An Improved Jiles-Atherton Model for DC Bias of Transformer

An Improved Jiles-Atherton Model for DC Bias of Transformer

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China International Electrical and Energy Conference (CIEEC)

作者： Huipeng Li Yizhao Liu Shifeng Zhang Ying Xiao Jinhao Wang Leyan Tantai State Grid Shanxi Electric Power Company Shanxi Electric Power Research Institute Taiyuan China Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (数字)9781728116754

ISBN: (纸本)9781728116761

The Jiles-Atherton (J-A) theory is widely used in the field of semi-macro hysteresis modeling. However, the DC bias transformer model based on presented J-A theory has a big deviation due to only existence of AC component and the description of the hysteresis curve is incomplete in the biased state. Firstly, this article makes a revision to the J-A formula under normal excitation state. Moreover, through innovative introduction of DC component to improve non-hysteresis magnetization curve and differential expression of magnetization of J-A theory under DC bias state, and the pinning coefficient k is modified to establish a numerical simulation model. By verfied, the improved J-A model can describe the magnetization characteristics of ferromagnetic materials in the biased state better. Then, based on the improved J-A formula proposed a transformer DC bias iterative model. Finally, a transformer in a 500 kV grid is used to verify the accuracy of transformer DC bias model based on the improved J-A formula.

关键词： J-A theory DC bias magnetism improved model hysteresis curve modeling hysteresis curve DC bias Transformer Modeling V-A THEORY AC component DC component

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