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8th renewable Power Generation Conference, RPG 2019

作者： He, Jing Li, Qing Chang, Yuanzhu Zhang, Jinping State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Model simulation is the mainstream method for low voltage ride through (LVRT) capability assessment of wind farms. To make sure the wind farm model simulated as the real-life system, the detailed model of target wind farm is needed. Meanwhile, in high density wind farm group, the transient performance of a wind farm could be influenced by neighbouring wind farms. The accuracy of LVRT simulation results is also related to the external wind farms if there are large interaction. It is necessary to investigate the interaction between wind farms in a wind farm group to find out whether the neighbouring wind farms should be considered and modelled as an aggregation model. The quantitative analysis method of interaction between wind farms during grid fault is proposed in this paper. The typical T-connection and radial connection topologies of wind farm groups are introduced. With the simplified mathematical model of wind farm group, key factors of transient interaction are derived. Additionally, the quantitative method of interaction is studied, and the influence coefficient is calculated through performance comparison between wind farms with and without interaction considered. The calculation results of a typical wind farm group demonstrate the effectiveness of the method proposed. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Transient analysis

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Study on coordinated control strategy of wind farm’s frequency regulation based on multi-layer hierarchical structure

Study on coordinated control strategy of wind farm’s freque...

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

作者： Wancheng Wang Yi Yang Dawei Zhao Minhui Qian College of Energy and Electrical Engineering Hohai University Nanjing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Nanjing Jiangsu Province China

ISBN: (数字)9781728157481

ISBN: (纸本)9781728157498

As the penetration rate of new energy sources such as wind power in the power grid continues to increase, the power grid generally puts forward requirements for its participating in the primary frequency regulation of power grid. At present, the commonly adopted strategy for wind farms to participate in frequency regulation is that each wind farm should participate in primary frequency regulation of power grid, and frequent adjustment will bring a certain degree of life loss to wind power equipment. On account of this reason, this paper presents a coordinated control strategy for the frequency regulation of wind farms based on a multi-layer hierarchical structure. When the grid frequency fluctuates, the active power of some wind farms with superior performance can be adjusted according to specific circumstances to complete frequency regulation target. The simulation results verify the effectiveness of the strategy and achieve a good frequency regulation effect.

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Empirical test and evaluation of efficiency of string PV inverters∗ 4

Empirical test and evaluation of efficiency of string PV inv...

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4th IEEE Workshop on the Electronic Grid, eGRID 2019

作者： Dong, Dong Yinghua Hao, Qin Junjun, Zhang Weixin, Yang Zhilei, Chen Hongtao, Li State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China Faith International Electronics Co. Ltd Nanjing China

ISBN: (纸本)9781728157047

In this paper, a method of efficiency test and evaluation for string PV inverter in empirical testing platform is proposed. Based on the operating mechanism and efficiency empirical testing requirements of string PV inverter, the method of efficiency test for string PV inverter is researched, the device of efficiency test for string PV inverter is developed to test string PV inverter in empirical testing platform. Moreover, based on the method of efficiency evaluation in laboratory, the evaluation method of string PV inverter based on empirical test result is proposed through empirical test data analysis and processing. The experimental results verify the effectiveness of the method. © 2019 IEEE.

关键词： Electric inverters

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Modular Multilevel Converter With Partial energy storage System for Frequency Support

Modular Multilevel Converter With Partial Energy Storage Sys...

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

作者： Haibo Tao Xiaofeng Yang Zejie Li Zixun Pan Yanbin Zhang State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China School of Electrical Engineering Beijing Jiaotong University Beijing China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

Frequency fluctuation becomes one of the urgent issues with the ever-increasing penetration of power electronics converters in the grid. This paper proposes a modular multilevel converter with partial energy storage system (MMC-PESS) where the arm is comprised of the normal submodule(NSM) and the energy submodule(ESM). Based on analysis of the relationship between the number proportion of ESMs and energy storage charging/discharging power, the control strategies including virtual synchronous machine (VSM) control, state of charge (SOC) equalization and the Buck/Boost control are developed for frequency support by applying the energy storage system. Finally, the theoretical analysis and frequency support performance are verified by the simulation results.

关键词： Multilevel converters Simulation Frequency conversion Topology Frequency synchronization Frequency control energy storage

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Fault Ride through Technology of Wind Power Transmission System and Its Research Scheme

Fault Ride through Technology of Wind Power Transmission Sys...

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2020 IEEE Sustainable Power and energy Conference, iSPEC 2020

作者： Li, Yan Tian, Xinshou Chi, Yongning Liu, Hongzhi Wei, Linjun Liu, Chao Song, Yuyan Liu, Lei Xing, Zhongwei China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing China College of Electrical Engineering Sichuan University Chengdu China Dongfang Electric Wind Power Co. LTD. Dongfang Electric Corporation Deyang China Research Center Shenzhen Hopewind Electric Co. Ltd Shenzhen China

ISBN: (纸本)9781728191645

In recent years, renewable energy represented by wind power and photovoltaic has developed rapidly in the world. China's renewable energy is the fastest-growing country in terms of wind power and photovoltaic power generation. 174 million kW, accounting for about 19% of total power capacity in China, renewable energy has become the second largest power source. In some province-level regional power grids with high renewable energy penetration rates, such as Gansu, Ningxia, Xinjiang, Hebei, and Inner Mongolia, the total installed capacity of renewable energy and power sources accounted for 41.4%, 36.5%, 32.2%, 30.1%, and 28.8%, respectively. According to the 2015 report of the National Development and Reform Commission's energy Research Institute, 'China's 2050 High Proportion of renewable energy Development Scenarios and Path Studies', by 2030, the cumulative installed capacity of wind and solar power will exceed 2.05 billion kW, accounting for approximately 51% of the country's total installed power capacity. With the rapid growth of the proportion of wind power, wind power must change its role from a supplementary power source to a main power source, and actively participate in power grid operation control to achieve wind-power-friendly grid connection. In the transient process of the power grid, in order to effectively solve the problem of transient active support for large-scale wind power grid connection, it is urgent to carry out a demand analysis of wind power fault ride-through characteristics and master the key technologies of active support control in the transient process of wind power. © 2020 IEEE.

关键词： Wind power

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Review on modeling of wind power generation systems

Review on modeling of wind power generation systems

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Qian, Minhui Zhao, Dawei Wu, Fubao Zhu, Lingzhi Chen, Ning Li, Haifeng Zhang, Ningyu Renewable Energy Research Center China Electric Power Research Institute Jiangsu Engineering Technology Research Center for Energy Storage Conversion and Application State Key Laboratory of Operation and Control Renewable Energy and Storage Systems Nanjing China State Grid Jiangsu Electric Power Company Nanjing China

ISBN: (纸本)9781728135205

In recent years, renewable energy generations, such as wind power generation, have a rapid development in a large scale all over the world. The development trend of renewable energy, from auxiliary power supply to main power supply even leading power supply, is becoming increasing obviously. Due to the fluctuation and intermittence of wind power, the safe and stable operation of power system has been threatened. The modeling of wind power generation system has become a key factor and hotspot issue that influence the interaction between wind plant and power grid, with scholars domestic and overseas all weight in. Hence institutions and organizations, such as GE, IEC, WECC, EPRI, CEPRI, also have attached great importance to this issue, relevant research guideline or report about wind power generation system modeling have been published continuously. The existing research both in domestic and outside is presented first in this paper, then the problems in modeling are analyzed, suggestions and prospects for future research are given at last. © 2019 IEEE.

关键词： Wind turbines

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Improving wind turbine efficiency through detection and calibration of yaw misalignment

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renewable energy 2020年 160卷 1217-1227页

作者： Bo Jing Zheng Qian Yan Pei Lizhong Zhang Tingyi Yang Beihang University Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Electric Power Research Institute Beijing China Power Concord Technology Co. Ltd Beijing China Chongqing University Chongqing China

Yaw misalignment has a serious impact on energy capture, power quality and health status of wind turbine. However, most detection and calibration methods require additional equipment and the detection results are seriously disturbed by the complex working conditions. In this paper, two types of typical yaw misalignments are defined at first. A new simulation method is applied to simulate the power outputs in different yaw states. Based on the simulation data, a detailed analysis of yaw misalignment effect on Wind Turbine Power Generation (WTPG) is made subsequently, and we find that different yaw misalignments have coupling effects on WTPG. According to the theoretical analysis, an improved yaw misalignment detection method based on Maximum Power Capture (MPC) is proposed, and only SCADA data is used as the model input. After detection, yaw misalignments can be easily calibrated without manual operation. Both simulation data and measured data of multiple wind turbines are used to evaluate the model performance. The results show that the proposed method can improve the efficiency of horizontal axis wind turbines by detecting and calibrating of yaw misalignment, and it has stronger robustness and wider applicability compared with other data-dirven methods.

关键词： Wind energy Yaw misalignment Detection Calibration Maximum power capture

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Coordinated peak regulation control strategy of BESS and thermal power units in high proportion new energy power system

Coordinated peak regulation control strategy of BESS and the...

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Sustainable Power and energy Conference (iSPEC)

作者： Shangxing Wang Xiangjun Li Yuchen Hao State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China State Grid Jiangsu Power Co. Ltd. Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

With the rapid development of new energy in recent years, its proportion in the power grid is increasing. The impact of its randomness, intermittence and negative peak regulation characteristics on the power grid is more and more significant. The “duck curve” characteristic of high proportion of new energy is obvious, which brings great pressure to the peak load regulation of power grid. BESS(battery energy storage system) is a kind of flexible and high-quality power grid regulation resources, which has fast output response ability and flexible configuration mode. It can significantly improve the peak load regulation ability of power grid by cooperating with conventional regulating power sources such as thermal power units, and effectively cope with the impact of new energy on peak load regulation of power grid. This paper first analyzes the impact of wind power and photovoltaic negative peak regulation characteristics on regional power grid peak regulation, and then proposes a coordinated peak regulation control strategy based on multi-scale signal decomposition theory for energy storage and thermal power units, and verifies the effectiveness of the method through simulation examples. This method can give full play to the ability of rapid regulation of BESS when the ratio of BESS is not high, and effectively deal with the peak regulation problem of high proportion of new energy power system.

关键词： Photovoltaic systems Thermal decomposition Wind power generation Regulation Power grids Thermal loading energy storage

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Harmonic current assessment method for wind farm excluding background harmonics 8

Harmonic current assessment method for wind farm excluding b...

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8th renewable Power Generation Conference, RPG 2019

作者： Li, Jianli Li, Qing Zhao, Jinshuai Zhang, Jinping State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing China College of Electrical Engineering and Information Technology Sichuan University Chengdu China

ISBN: (纸本)9781839531255

Accurate calculating harmonic currents of the wind farm without the influence of background harmonics, is a hot and difficult issue in the field of wind farm testing. The key point of excluding background harmonic influence is to determine the harmonic impedance on both sides of the point of interconnection (POI) of wind farm. A new method for calculating the harmonic impedance on both sides of POI was proposed. Firstly, a set of Zs and Zc is obtained from several testing data based on Complex Independent Component Method, and Zs and Zc are harmonic impedance of grid side and wind farm side, respectively. Then, these harmonic impedance values are filtered by Complex Linear Regression method. The final Zs and Zc are obtained by 95% probability method. The harmonic current from grid side and wind farm side can be calculated by Norton equivalent circuit model at the POI. The simulation results show that the harmonic impedance values calculated after impedance screening are more accurate. This method can effectively eliminate the influence of background harmonic and accurately obtain the harmonic current of the wind farm, and provide an accurate basis for the harmonic characteristics evaluation and harmonic control of the wind farm. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Harmonic analysis

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A Novel Scenario Reduction Method for Static Voltage Stability

A Novel Scenario Reduction Method for Static Voltage Stabili...

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

作者： Guobing Gao Lei Wang Yongning Chi Xingdong Xu 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 Shandong University of Technology Zibo China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

The scenario-based method has been widely used to model the uncertainty in power systems. To decrease the complexity and computational burden for the evaluation and solution of the stochastic static voltage stability problem due to the integration of renewable energy sources, we propose a novel scenario reduction method in this paper. Compared with the other scenario reduction method, the load margins of the scenarios to Saddle Node Bifurcation (SNB) are used to group all the scenarios, as well as the distances of the wind power output, which can avoid the elimination of the extreme scenarios for the voltage stability problem. The central scenarios obtained by the proposed scenario reduction method are more representative for the voltage stability problem. Two tests on the IEEE 118-bus power system are carried out to demonstrate the performance of the proposed scenarios reduction method.

关键词： Wind energy generation Uncertainty System integration Power system stability Wind power generation Stability analysis Voltage control

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