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Annual Conference of Industrial Electronics Society

作者： Tao Xue Jing Lyu Yan Li Han Wang Xu Cai State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric power Research Institute Beijing China School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9781728154145

ISBN: (纸本)9781728154152

Recently, the impedance-based method is regarded as a desirable way to analyze the interactive stability between power converters and grids. However, most of the modeling processes only consider parts of control strategies and lack in the analysis of impact of control bandwidths. To fill this gap, this paper derives a thorough and explicit impedance modeling process of grid-tied voltage source converters (VSCs) by considering inner- and outer-loop controls, phase-locked loop (PLL) as well as different control strategies, which has been validated by frequency scanning method. Furthermore, the impacts of control strategies and bandwidths on the impedance characteristics are investigated. Different q-axis outer-loop controls play more significant role in shaping impedances than different d-axis outer-loop controls. Besides, changes in inductive and capacitive characteristics of VSC impedances are clarified when bandwidths of different control loops are changed. Time domain simulation indicates the effectiveness and correctness of the analysis.

关键词： Impedance Mathematical model Phase locked loops Power system dynamics Voltage control Analytical models Power system stability

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A Three-Stage Ensemble Short-Term Wind Power Prediction Method Based on VMD-WT Transform and SDAE Deep Learning

A Three-Stage Ensemble Short-Term Wind Power Prediction Meth...

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

作者： Peng Xiaosheng Zhang Zuowei Xu Qiyou Wang Bo Che Jianfeng Yang Fan Li Wenze Huang Zian State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

ISBN: (数字)9781728143033

ISBN: (纸本)9781728143040

Accurate wind power prediction (WPP) will contribute not only to the economic dispatching of power system but also to the safe and stable operation of the power grid. A novel three-stage ensemble short-term WPP method is proposed in this paper to effectively improve the WPP accuracy. First, in stage one, variational mode decomposition (VMD) and wavelet transform (WT) are applied to decompose the original wind power sequence into multiple subsequences. Second, in stage two, multiple stacked denoising auto-encoders (SDAE) are constructed based on the subsequences to perform WPPs separately. Third, in stage three, and the support vector machine (SVM) is applied to assign weights to each sub-prediction value to obtain the final ensemble prediction result. The case study shows that, compared with back propagation neural network (BPNN) and SVM, the average normalized root mean square error (NRMSE) and normalized mean absolute error (NMAE) of proposed ensemble WPP method, in the step range of 12 hours, are reduced by 19.66% and 19.91% compared to BPNN, and 14.43% and 14.65% compared to SVM, respectively, which illustrates the effectiveness and advancement of the proposed method.

关键词： Predictive models Support vector machines Machine learning Wind power generation Training Noise reduction Wind forecasting

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Wind Farm Equivalent Model Based on Power Output Sensitivity of Wind Turbines

Wind Farm Equivalent Model Based on Power Output Sensitivity...

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2019 IEEE Sustainable Power and energy Conference, iSPEC 2019

作者： Yan, Li Yongning, Chi Haiyan, Tang Xinshou, Tian Yuanzhu, Chang China Electric Power Research Institute China State Key Laboratory of Operation Control of Renewable Energy and Storage Systems Beijing China Huazhong University of Science and Technology School of Electrical and Electronic Engineering Wuhan China

ISBN: (纸本)9781728149301

In general, a wind farm composed of a wind turbine can control the exchange of reactive power between its wind farm outlet and the grid, that is, the entire wind farm does not emit or consume reactive power. Therefore, the reactive power loss of the wind farm of the doubly-fed wind turbine is only the reactive load of the system. Compared with the wind farm of the asynchronous wind turbine, the reactive power consumption of the wind farm of the doubly-fed wind turbine becomes smaller, and the voltage stability is obvious. Better than asynchronous wind turbine wind farms, the reactive power voltage control ability of the grid is weaker than that of synchronous generators. Therefore, when a part of the wind power in the power grid replaces the thermal power generation, the voltage stability of the power grid will be reduced, and the degree of reduction will depend on the reactive power reserve of the thermal power unit in the power grid. In this paper, the wind turbine is connected to the power grid as the research object. According to the voltage characteristics analysis after the wind power is connected to the power grid, the electrical characteristics and its influence in the wind farm are studied. Based on this, the equivalence modeling of the wind farm is proposed. © 2019 IEEE.

关键词： Wind farm

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A Short-Term Regional Wind Power Prediction Method Based on XGBoost and Multi-stage Features Selection

A Short-Term Regional Wind Power Prediction Method Based on ...

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IEEE Student Conference on Electric Machines and systems

作者： Wenze Li Xiaosheng Peng Kai Cheng Hongyu Wang Qiyou Xu Bo Wang Jianfeng Che School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan Hubei China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

When wind power is integrated to the grid on a large scale, the power system is greatly disturbed by wind power because of the randomness and volatility of wind power. Regional wind power prediction (WPP) is an effective measure to improve the ability of grid to absorb wind energy. A short-term regional WPP method based on XGBoost and multi-stage features selection is presented in the paper to improve the accuracy and efficiency of regional WPP. Firstly, the original features extraction of regional wind farm is performed, and high-dimensional features of regional wind farm are constructed. Then, the filtering features selection method and the embedded features selection method are applied to perform multi-stage features selection for the high-dimensional features of the constructed regional wind farm. The XGBoost short-term regional WPP method is constructed based on the results of multi-stage features selection. And the key parameters of XGBoost short-term regional WPP model are optimized. Finally, the results of the XGBoost short-term regional WPP method is compared with the four-hour regional WPP results of three models, which are regression tree, random forest and Support Vector Machine (SVM). The result is shown that compared with regression tree, random forest and SVM, Root Mean Squared Error (RMSE) of the XGBoost model is reduced about 1% in the 4-hour regional WPP.

关键词： Support vector machines Vegetation Wind power generation Predictive models Wind farms Feature extraction Regression tree analysis

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Mechanisms accounting for the repeated occurrence of torrential rainfall over South Thailand in early January 2017

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Atmospheric and Oceanic Science Letters 2020年第2期13卷 155-162页

作者： JIN Shuanglong FU Shenming State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijingChina Electric Power Meteorology State Grid Corporation Joint Laboratory BeijingChina International Center for Climate and Environment Sciences Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina

Based on CMORPH precipitation estimates and ERA5 reanalysis data,this study investigates the mechanisms accounting for the repeated occurrence of torrential rainfall over South Thailand in early January 2017,which induced the strongest floods over Ko Samui and Ko Phangan in the last almost 30 *** is found that the maintenance of a northeastward-moving mesoscale vortex that formed southwest of the Indochina Peninsula was the direct reason for the series of torrential rainfall *** of the vorticity budget illustrates that convergence-related horizontal shrinking was the most favorable factor for the maintenance of the *** was the second most favorable factor,whereas horizontal and vertical transport mainly caused a net export of cyclonic vorticity from the vortex’s three-dimensional range,which was detrimental for its *** analysis indicates that tilting and vertical vorticity transport were sensitive to the vortex’s displacement and the enhancement of cyclonic vorticity at lower levels around the vortex,respectively,as the two factors showed completely different effects on the persistence of the vortex during two different stages.

关键词： Heavy Rainfall Thailand Vorticity Budget Tilting

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The Experiences and Practices on Market with Large-Scale renewable energy Grid Integration

The Experiences and Practices on Market with Large-Scale Ren...

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2019 IEEE Sustainable Power and energy Conference, iSPEC 2019

作者： Yan, Li Yongning, Chi Xinshou, Tian Zhankui, Zhang Haoyong, Cheng China Electric Power Research Institute China State Key Laboratory of Operation and Control Renewable Energy and Storage Systems Beijing China South China University of Technology School of Electrical Power Guangzhou Guangdong China

ISBN: (纸本)9781728149301

In order to accommodate renewable energy, the power system should regulate the power supply of the traditional power plant according to the power of the renewable energy to achieve the balance of supply and demand of the whole system. It can be seen that one of the challenges of large-scale renewable energy grid-connected is the balance of supply and demand of the multi-party collaborative maintenance system of the power system. Due to the intermittent, random and fluctuation characteristics of renewable energy, large-scale renewable energy integration and participation in electricity market have a great impact on the operation of the electricity market. There are many related researches in the world, and many scholars have done a more in-depth study on this. At present, relevant research mainly focuses on the optimization operation of renewable energy power systems, promoting policies, technical means and market mechanisms for renewable energy consumption. During the last few decades the power market reforms are executed in so many countries due to the development of renewable energy. Traditional electricity market mechanism has been unable to adapt to the situation of large-scale development of wind and PV power in China, and the new power market mechanism has not been established, and market consumption has become the biggest bottleneck in the development of renewable energy. This paper analyzes the impact of renewable energy participation in electricity market and takes Germany, Northern Europe and Spain as typical example, introduces the countermeasures of mature foreign power market, and finally puts forward inspiration and reference. © 2019 IEEE.

关键词： renewable energy resources

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Research on the Technology Requirement of Distributed renewable energy AC/DC Output System and Network Voltage Coordinated control

Research on the Technology Requirement of Distributed Renewa...

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

作者： Yan Li Hongzhi Liu Yiwen Fan Xinshou Tian Yu Xiao Cong Wang China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

energy is the foundation of the country and determines the economic and social development. The sustainable development of the economy is related to the environmental problems brought about by energy use. The low-carbon development of energy is related to the future of the country. In low-carbon energy, Distributed PV energy is an inexhaustible renewable energy source. High proportion distributed renewable energy intensive connect to the input power network has a serious impact on the voltage stability of the power network, which may lead to voltage fluctuations or even instability of the input power system. The reactive power voltage stability and safety reliability of the input power grid are at great risk. Therefore, it is necessary to carry out voltage control research based on the joint regulation of “grid-source” diversified equipment, and improve the stability of distributed renewable energy after grid connection from the operational level. On the one hand, the connect to high proportion distributed renewable energy makes the structure of the grid power supply system more complicated, the control variables and constraints also increase, and the system reactive power optimization and corresponding control algorithm requirements are improved. On the other hand, considering the randomness, volatility and unpredictability of the output characteristics of the PV unit, problems such as reactive power, voltage coordinated control and long-distance low-voltage transmission line charging between the units are generated. In this paper, the in-depth study on the coordinated control of distributed renewable energy and the input grid voltage and reactive power is carried out to provide support for the safe and reliable operation of distributed renewable energy power and distribution network.

关键词： renewable energy sources Reactive power Power system stability Stability analysis Power system reliability Voltage control Transient analysis

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The key Issue of control Strategy For Large-scale Wind Power Grid Integration

The Key Issue of Control Strategy For Large-scale Wind Power...

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

作者： Yan Li Xinshou Tian Jianzu Hu Chao Liu Cong Wang Yu Xiao China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

With integration of the large wind energy bases into power grid, wind energy has gradually become an important form of power supply. In order to ensure the stable operation and safe of the power grid after the large wind energy bases are connected, the operation control technology of the power grid after the large wind enengy bases are connected will become more and more important. Therefore, it is necessary to study the operating characteristics and control strategies of large wind energy bases based on the specific problems of power grids and the large-scale centralized connect to wind power grids, combined with the large wind energy bases already constructed and planned in the Northwest and North China power grids. The technical conditions for wind farms grid-connected operation study, the impact of large wind energy bases in North and Northwest China Power Networks on the system operation and stability modes, and the control measures would be include. Technical measures for optimal allocation of reserve capacity, auxiliary decision, power balancing and frequency regulation, suppression of low-frequency oscillation and reactive voltage control for large-scale wind power grid connected power systems would be studied.

关键词： Power measurement Wind energy Wind power generation Power system stability Wind farms Power grids Wind energy integration

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Research on Capacity Planning of renewable energy Grid Integration Based on Effective Short Circuit Ratio

Research on Capacity Planning of Renewable Energy Grid Integ...

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Sustainable Power and energy Conference (iSPEC)

作者： Yan Li Yongning Chi Xinshou Tian Chao Liu Jianzu Hu Yiwen Fan Xiaojie Fan Yu Xiao Cong Wang China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

In most of the regions of China where large-scale renewable energy is connected to the grid, most of the grid structures are weak, and even local power grids have low voltage levels, weak grid structures, and long-distance small-capacity power transmission. Large-scale renewable energy integration will make the power grid face severe challenges such as capacity planning, integration methods, and transmission channels. The regional power grids connected by renewable energy power stations are mostly in remote areas with relatively distributed loads. The regional power grids have longer transmission lines and the grid is relatively weak. Large-scale renewable energy collection, the cost of different collection methods is different, the impact on the stability of the power system is different, the corresponding protection measures, optimization methods are also different, and these problems need to be solved urgently. The characteristics of the power grid itself are the decisive conditions for determining whether the system can operate stably after the renewable energy grid integration. Under normal condition, the centralized connect to renewable energy is at the end of the grid, which is a typical weak connection system. According to the actual operating experience of renewable energy, the voltage stability of renewable energy power stations is strongly correlated with reactive power. On the one hand, the configuration of the reactive power regulating device in the system is insufficient, and the system loses its ability to control the voltage due to the exhaustion of the reactive power reserve, resulting in voltage instability. On the other hand, the non-global control of each reactive power source device in the system, and the adjustment limit of the discrete equipment gear position increase the reactive power loss of the long-distance transmission line, so that the area requiring reactive support cannot obtain the reactive power supply, it can also cause voltage ins

关键词： renewable energy sources Reactive power Power system stability Power grids Voltage control Transient analysis Power generation

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Fault Ride-through Demand of Large-scale Islanded renewable energy Connected to VSC-HVDC System and Its key Technologies

Fault Ride-through Demand of Large-scale Islanded Renewable ...

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HVDC (HVDC), International Conference on

作者： Yan Li Hongzhi Liu Yongning Chi Yiwen Fan Xiangyu Li Fan Cheng Zhibing Wang Chunxia Wei Lijun Xie China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China School of Electrical and Electronic Engineering North China Electric Power University Beijing China

ISBN: (数字)9781728175935

ISBN: (纸本)9781728175942

The adaptability of renewable energy connected to the VSC-HVDC grid will become an important issue affecting grid operation. In particular, the complex interaction between renewable power generation and the power grid brings new challenges to the renewable power generation and VSC-HVDC grid to achieve fault ride-through. Therefore, it is necessary to study the fault ride-through strategies of the VSC-HVDC grid-renewable power generation combined system. According to the operating characteristics and adaptability of renewable energy clusters connected to the VSC-HVDC grid under different faults, this paper proposes technical requirements for high- / low-voltage fault ride-through of renewable power plants that are connected to the grid in island operation, and analyzes key technologies for renewable power generation dealing with AC faults at the sending end of the grid in island integration mode. It is expected to realize joint fault ride-through of renewable energy and VSC-HVDC, thereby increasing the availability of the system, contributing to the safe and stable operation of renewable energy and VSC-HVDC grid, providing technical support for the planning of large-scale renewable energy delivery methods, and effectively guiding the planning and design of renewable energy and VSC-HVDC grid.

关键词： Power conversion renewable energy sources Power system stability Power generation Circuit faults Wind farms Power systems

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