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7th IEEE Conference on Energy Internet and Energy System Integration, EI2 2023

作者： Wang, Xiangyan Chen, Ning Zhang, Lei China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Nanjing210003 China

ISBN: (纸本)9798350345094

To promote low-carbon power system development, our country is increasing new energy grid integration. However, the uncertainty of new energy output brings significant pressure to the stable operation of the power grid, where the large-scale accommodation of new energy has always been a global challenge. As an important pillar of the stability of the new power system, energy storage systems can flexibly adjust power supply and effectively alleviate the impact of new energy output fluctuations on the power grid. In response to this, this paper proposes an optimal allocation method for energy storage resources aimed at absorbing new energy, first establishing the multi-period energy-storage system integrated direct current optimal power flow model, then considering the demand for new energy accommodation in multiple scenarios, it embeds the constraints of new energy accommodation into the aforementioned model. The case study compares the results of energy storage allocation under different new energy accommodation demands, demonstrating the rationality and effectiveness of the method proposed in this paper. © 2023 IEEE.

关键词： Energy storage

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Modeling and SOC estimation of lithium iron phosphate battery considering capacity loss

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Protection and control of Modern power systems 2018年第1期3卷 61-69页

作者： Junhui Li Fengjie Gao Gangui Yan Tianyang Zhang Jianlin Li School of Electrical Engineering Northeast Electrical Power UniversityJilinChina Dongying Electric Power Supply Company State Grid Shandong Electric Power CompanyDongyingChina State Key Laboratory of Operation and Control of Renewable Energy&Storage Systems China Electric Power Research InstituteBeijingChina

Modeling and state of charge(SOC)estimation of Lithium cells are crucial techniques of the lithium battery management *** modeling is extremely complicated as the operating status of lithium battery is affected by temperature,current,cycle number,discharge depth and other *** paper studies the modeling of lithium iron phosphate battery based on the Thevenin’s equivalent circuit and a method to identify the open circuit voltage,resistance and capacitance in the model is *** improve the accuracy of the lithium battery model,a capacity estimation algorithm considering the capacity loss during the battery’s life *** addition,this paper solves the SOC estimation issue of the lithium battery caused by the uncertain noise using the extended Kalman filtering(EKF)algorithm.A simulation model of actual lithium batteries is designed in Matlab/Simulink and the simulation results verify the accuracy of the model under different operating modes.

关键词： Lithium-iron battery Battery model Capacity fading state of charge estimation

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Coordinative control strategy of virtual inertia and primary frequency of DFIGs based wind farms

Coordinative control strategy of virtual inertia and primary...

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2016 IEEE PES Asia Pacific power and Energy Engineering Conference, APPEEC 2016

作者： Tian, Xinshou Wang, Weisheng Yan, Li Tang, Haiyan Chi, Yongning Wang, Yukun Zhen, Wang State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781509054183

The mechanical parts of doubly fed induction generators (DFIGs) is decoupled from electrical parts, which makes the output active power hard to respond the frequency change of power grid, it becomes a new challenge to frequency stability of power grid with large scale wind power grid integration. A coordinative control strategy of virtual inertia and primary frequency of DFIGs based wind farms is given, and its principle is analyzed in the paper. The primary frequency control is a slow process, which is mainly implemented by control level of DFIGs based wind farms, and the DFIGs is cooperative. The virtual inertia control is a fast process, which is only implemented by control level of DFIGs. The theoretical analysis and time domain simulation show that the proposed control strategy can guarantee the frequency stability of power grid with large scale wind power integration. © 2016 IEEE.

关键词： Wind farm

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RENEWABLE ENERGY TIME-SERIES PRODUCTION SIMULATION METHOD CONSIDERING PUMPED-STORAGE 10

RENEWABLE ENERGY TIME-SERIES PRODUCTION SIMULATION METHOD CO...

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10th Renewable power Generation Conference, RPG 2021

作者： Meng, Na Li, Xiaofei Wang, Shuai Zhang, Jinping State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781839536069

With the increasing proportion of renewable energy power generation, the volatility of renewable energy power generation output puts higher requirements on the power system operation and regulation capability. Pumped-storage is an effective means to improve the flexibility of system operation and promote the accommodation of renewable energy. Affected by the uncertainty of renewable energy power output and energy storage capacity, the power limitations of pumped-storage, accurate quantification of the effect of pumped-storage in promoting renewable energy accommodation requires time-series simulation calculations. This paper studies the mechanism of pumped-storage to promote renewable energy accommodation. Pumped-storage can directly or indirectly increase the accommodation space of renewable energy by energy storage, providing spinning reserve and peak regulation. Based on the above research results, a time-series simulation model of renewable energy accommodation capacity considering pumped-storage was constructed. A case analysis of the model based on actual operating data verifies that the proposed method can realize the quantitative calculation of the pumped-storage to promote the accommodation of renewable energy. © The Institution of Engineering and Technology.

关键词： Renewable energy resources

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Research on Reactive power Planning Technology of power Grid Containing UHVDC System with High Proportion of Renewable Energy Integration 7

Research on Reactive Power Planning Technology of Power Grid...

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

作者： Yan, Li Xinshou, Tian Jianzu, Hu Chao, Liu China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing China

ISBN: (纸本)9781728155111

In large-scale renewable energy bases, thousands of renewable energy power generation units are often installed, but wind power is different from the reactive characteristics of traditional thermal power plants, the renewable energy power plant is essentially a weak grid with strong voltage sensitivity. Weak-end power grids have weak voltage support capabilities and prominent reactive power problems. Under the operating conditions of large-scale renewable energy generation, heavy line load and other operating conditions, the randomness and fluctuation of renewable energy generation will lead to the voltage of the local power grid in the connected area. Large fluctuations can easily induce serious system security and stability accidents. The occurrence of multiple large-scale wind power off-grid accidents has highlighted the problem of system reactive voltage stability caused by large-scale renewable energy grid connection. The existing reactive voltage control method based on a single renewable energy power plant has been unable to meet the needs of large-scale renewable energy development, and it is urgent to study the renewable energy power generation unit in a large renewable energy power plant that takes into account the voltage distribution and rapid change of active power in the field, and centralized reactive power compensation equipment reactive voltage control mode. The impact of large-scale renewable energy centralized connect to the reactive voltage stability of the power grid is not only a local issue but has become a global issue. It is necessary to carry out research on reactive power allocation of power systems that takes into account the large-scale renewable energy grid connection. By coordinating the reactive power control of large-scale renewable energy bases and the main grid, the voltage stability level of the entire system is improved to prevent large-scale wind power off-grid accidents. © 2020 IEEE.

关键词： Voltage control

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Fire Extinguishing Effect of Reignition Inhibitor on Lithium Iron Phosphate Storage Battery Module 10th

Fire Extinguishing Effect of Reignition Inhibitor on Lithium...

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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Zhang, Mingjie Yang, Kai Liu, Jialiang Lai, Yilin Liu, Hao Chen, Hao Fan, Maosong Geng, Mengmeng State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9789819934072

After fire extinguishing, there will be smoke generation, reignition, and the uncontrolled heat spread of lithium-ion batteries. Given this situation, the fire-extinguishing effect of heptafluoropropane combined with reignition inhibitors on lithium iron phosphate batteries used for energy storage and the amount of reignition inhibitors are analyzed in this paper. The experimental results show that the reignition inhibitor with high thermal stability can exist in liquid form for a long time to achieve long-time cooling of the battery. Therefore, it can effectively inhibit the internal thermal runaway reaction of the battery and then impede the battery's reignition and thermal runaway spread after the fire. The dosage test of reignition inhibitor show that the cooling effect of full submerged method is better than the half submerged method. In addition, the fully submerged method can absorb various particles, and electrolyte vapors brought out by combustion smoke, reduce the amount and concentration of smoke injection, and reduce the harm of smoke after thermal uncontrol of the battery. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Iron compounds

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Study on Grid-connected Renewable Energy Grid Code Compliance

Study on Grid-connected Renewable Energy Grid Code Complianc...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Yongning, Chi Yan, Li Zhen, Li Ziyu, Chen Hongzhi, Liu China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China

ISBN: (纸本)9781728149301

Since requirements for renewable power are set in grid codes, power plant operators should take the responsibility to guarantee grid code compliance, and system operators on the other hand should evaluate the effect of specific power plants on power system operation in various situations. Non-compliance of power plants with grid code may lead to subsidy curtailment even after its disconnection from the grid. In order to unify the understanding level and measurement scale of grid code compliance, objective and systematic standards about compliance testing and assessment are necessary. The objective of renewable power testing is to outline measurement methods for the determination of reliable and comparable data for power generating units and plants based on state-of-the-art technology. The process of testing the electrical behavior of renewable power plants meet specific technical requirements in grid codes is also needed to be specified. Generally, grid compliance test of renewable energy mainly includes power quality test, control performance test, low-voltage ride through test, voltage/frequency response test and anti-islanding protection test. It is available to test the capability of the whole renewable plant for the performance of power quality and control performance. Some items such as low-voltage ride through test, voltage/frequency response test or anti-islanding protection test that can not be tested for the entire power plant for the reasons that the capacity of test facilities does not as large as the entire plant or testing will cause an unacceptable impact on the grid. Therefore testing the wind turbine or PV power unit then making the simulation to assess grid compliance of the whole plant is well alternative method. This paper provides an introduction about the study on grid code compliance testing of renewable energy grid integration on both technologies and standardization aspects, and tries to explore potential challenge caused by the integration

关键词： Quality control

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Research on High Voltage Ride Through of Wind Turbine based on Combination of Series Impedance Divider and Parallel High Impedance Grounding

Research on High Voltage Ride Through of Wind Turbine based ...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Yan, Li Yongning, Chi Haiyan, Tang Xinshou, Tian China State Key Laboratory of Operation Control of Renewable Energy Storage Systems China Electric Power Research Institute Beijing China

ISBN: (纸本)9781728149301

The impact of high voltage ride through (HVRT) capability of wind energy on the security of power grid is therefore much concerned. At present, there have been no explicit requirements for technical rules of HVRT. However, the high voltage phenomena may occur during the voltage recovery after the clearance of short circuit faults, and the operation of power grid could also lead to high voltages. With the increasing scale of integration of renewable energy, the high voltage issue has become an important barrier that limits the large-scale integration of wind power. Therefore, it is very necessary to carry out research on HVRT to make sure the security and stability of power grid with large-scale wind power. This paper proposes an HVRT method for wind turbine based on combination of series impedance divider and parallel high impedance grounding equipped at the wind turbine terminal. According to the voltage dividing characteristic of impedance in the classic circuit analysis, the series impedance is installed at the wind turbine terminal. During high voltage period time, switch series impedance is closed to realize high-impedance grounding that decreases the terminal voltage. When the voltage recovers to normal range, cut off series impedance, then HVRT is fulfilled. © 2019 IEEE.

关键词： Wind turbines

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Analysis of interaction between wind turbines in wind farm based on small signal model of doubly-fed wind turbine 8

Analysis of interaction between wind turbines in wind farm b...

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8th Renewable power Generation Conference, RPG 2019

作者： Li, Yan Chang, Yuanzhu Chi, Yongning Tang, Haiyan Tian, Xinshou China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

As the penetration rate of renewable energy in the system becomes higher and higher, the interaction between renewable energy and the system becomes more and more obvious. Taking a wind farm as an example, a single wind turbine and system are coupled together by the voltage of the wind turbine. The voltage of the wind turbine is determined by the internal potential of the wind turbine and the grid voltage. When the wind power penetration rate in the system is relatively high, the influence of the potential of the wind turbine on the voltage will be as important as the influence of the system on the internal potential. The system disturbance will have a dynamic impact on the voltage of the wind turbine. Since the convertor of the wind turbine is strongly dependent on the voltage, the dynamics of the voltage will bring about the dynamics of the wind turbine convertor. When there is disturbance on the wind turbine side, the dynamics of the wind turbine power will affect the voltage, which in turn affects the voltage of each node of the power system. Therefore, the system has a strong interaction between the wind turbine and the grid under high wind power penetration. In this paper, the current mainstream model doubly-fed wind turbine wind farm is taken as an example. Firstly, the influence of system power grid dynamics under different power variations on the dynamic behavior of doubly-fed wind farm integration is analyzed. On this basis, the influence of the power collection line of electrical connection in the wind farm on its dynamic characteristics is studied, and the analysis of the interaction of the wind turbines in the wind farm is realized. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Wind turbines

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Study on the influence of PV power generation model parameter variation on power system

Study on the influence of PV power generation model paramete...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Han, Hualing Qu, Linan Zhu, Lingzhi Chen, Ning China Electric Power Research Institute China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research China

ISBN: (纸本)9781538614273

This paper focuses on the influence of PV power plant model and parameters on the calculation of safety and stability of power system. Based on the actual situation of Xinjiang power system in 2016, this paper does research on the influence of PV model parameters on system frequency stability, power angle stability and voltage stability under the condition of PV access in high permeability was studied. © 2017 IEEE.

关键词： Electric power system stability

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