Table of Content

30 October 2020, Volume 0 Issue 10

Previous Issue    Next Issue

Overview

Analysis of Typical Policies for Energy Storage in the 14th Five-Year Plan

LI Jianlin, CUI Yilin, WANG Han, WANG Li

2020, 0(10):  1-6.  doi:10.16628/j.cnki.2095-8188.2020.10.001

Asbtract ( 439 )   HTML ( 14)   PDF (1232KB) ( 356 )  

Figures and Tables | References | Related Articles | Metrics

2020 is the year of the “14th Five-Year Plan” and the energy storage industry is expected to develop further.Under the guidance of various national policies,the energy storage-related policies have been issued based on the regional characteristics,which accelerates the commercialization of energy storage to a certain extent.This article combs and analyzes the national and local energy storage-related policies in new energy power generation,power auxiliary services,5G infrastructure,etc.,and analyzes the policy points of energy storage technology in the national action plan and the development status of energy storage applications.Combined with the commercialization process of energy storage,the corresponding suggestions are given,which have certain reference value for the further development of energy storage in the future.

Energy Storage Technology Development Trend and Technology Status Analysis

RAO Yufei, SI Xuezhen, GU Qingfa, YANG Haijing

2020, 0(10):  7-9.  doi:10.16628/j.cnki.2095-8188.2020.10.002

Asbtract ( 832 )   HTML ( 49)   PDF (2626KB) ( 656 )  

Figures and Tables | References | Related Articles | Metrics

With world widespread application of renewable energy and the rapid development of electric vehicle industry,energy storage technology will become a key part to promote energy development.There are large differences in the maturity of different energy storage technologies.It is necessary to build an energy storage technology layout that complements multi-energy,complements strengths and weaknesses,adapts to local conditions,and prioritizes benefits.This paper sorts out the main energy storage technologies used in power systems,introduces the corresponding principles of various energy storage forms such as electrochemical energy storage,electromagnetic energy storage,heat storage technology,chemical fuel energy storage,and the future of energy storage technology.The development and application trends are prospected.The research and analysis can be used to reduce the cost of energy storage systems,improve the performance and maturity of energy storage technologies,and provide a certain reference and assistance for the solid and orderly promotion of sustainable development of clean energy.

Research & Analysis

Business Model Research and Economic Analysis of Energy Storage Power Station

LIU Chang, LI Dexin, LÜ Xiangyu, WANG Jiarui, WANG Wei, GUO Li

2020, 0(10):  16-20.  doi:10.16628/j.cnki.2095-8188.2020.10.003

Asbtract ( 390 )   HTML ( 7)   PDF (1066KB) ( 597 )  

Figures and Tables | References | Related Articles | Metrics

With the further promotion of new energy generation,the electrochemical energy storage has been given more attention to.Its business model and economy affect the sustainable and healthy development of the industry.This paper described the functions of the energy storage in the power system,and the profit model of the energy storage power station was provided.The two business models,peak valley price difference model and two-part electricity price model,are proposed according to the profit model.As an example,the two business models of the 10 MW/40 MWh liquid flow energy storage are discussed,and the internal rate of return and static electricity price are calculated respectively.Finally,the reasonable suggestions are advanced.The research can provide a reasonable basis for the energy storage price setting and promote the development of large-scale energy storage.

Research on User-Side Energy Storage Adaptability Based on Virtual Power Plant and Load Aggregator

PENG Xueyin, HUANG Bowen, PAN Xuan, LIU Louzhi, YIN Xufeng, ZHOU Renjun

2020, 0(10):  21-26.  doi:10.16628/j.cnki.2095-8188.2020.10.004

Asbtract ( 310 )   HTML ( 5)   PDF (1518KB) ( 288 )  

Figures and Tables | References | Related Articles | Metrics

Based on the economic and technical characteristics of user-side energy storage,this paper considers the internal and external revenue increments of user-side energy storage,and proposes user-side energy storage fitness value indicators,which are used as optimization goals.To verify the generality of the value index,the load aggregator and the new technology of the virtual power plant are selected as the research objects for detailed characterization.Taking a real-time electricity price energy market as the background,a certain industrial user was selected for simulation.The results show that the fitness index can quantify the adaptive capacity of the user-side energy storage; revealing that the user-side energy storage only depends on the peak and valley reduction of basic electricity and electricity costs.It is basically not profitable,but there is a wind power supplier that is a complementary object of user-side energy storage demand in the virtual power plant,which improves the adaptability of user-side energy storage.

Research on Grid Loop Closing Techniques Based on Battery Energy Storage Systems

SHAO Yunfeng, LIU Yongqiang, MA Zhongjing, GAO Zhigang

2020, 0(10):  27-35.  doi:10.16628/j.cnki.2095-8188.2020.10.005

Asbtract ( 287 )   HTML ( 7)   PDF (1835KB) ( 277 )  

Figures and Tables | References | Related Articles | Metrics

Grid loop closing operations are widely used in power systems,which can make it possible to do the power-grid maintenances and optimize the power system.However,the phases,frequencies and magnitudes of different power lines are not the same.As a result,the grid loop closing operation might cause accidents such as over current, which can lower the reliability of the system and deteriorate the stability.Moreover,in some cases,the grid loop closing operation is not reasonable because the voltages vary too much,which will lead to a power failure inevitably.In order to make the grid loop closing operation successful and improve the quality of the power supply,this paper proposed a topology based on the battery energy storage systems,which can provide power to the loads in the transient state.The model of the topology was established and the working schemes were analyzed.A control strategy in different stages was formed.The simulation results validate the proposed topology and schemes.

Research on Demand of Photovoltaic Energy Storage System for Reducing Abandonment Rate

LI Dexin, WANG Jiarui, ZHANG Jiajun

2020, 0(10):  36-40.  doi:10.16628/j.cnki.2095-8188.2020.10.006

Asbtract ( 381 )   HTML ( 6)   PDF (1270KB) ( 306 )  

Figures and Tables | References | Related Articles | Metrics

With the increase in photovoltaic installations,its requirements for energy storage systems are also increasing.There is an urgent need for the research on the demand for energy storage systems in actual operation of photovoltaic power generation.The purpose of this paper is to reduce the waste light rate.First,the paper carries out the analysis of the output characteristics of the light storage and the extraction of the characteristics of the energy storage system,puts forward the expected value of the demand for the energy storage equipment under the operating conditions,and then establishes the mathematical model of the energy storage system output,and taking the light rate working condition as an example,verifies the charging and discharging state of the energy storage under the selected working condition,and finally obtains the demand of the energy storage system under the working condition.

Thermal Simulation and Optimization of Lithium Iron Phosphate Battery Modules Based on Ansys

CHEN Xuhai, LUO Jingsheng, CHEN Yongfu, XIE Jianhua, CHEN Kai, DONG Jiqing

2020, 0(10):  41-46.  doi:10.16628/j.cnki.2095-8188.2020.10.007

Asbtract ( 396 )   HTML ( 7)   PDF (3243KB) ( 417 )  

Figures and Tables | References | Related Articles | Metrics

Based on the finite element analysis software of Ansys/Fluent,this paper built the model of lithium iron phosphate batteries and simulated the temperature field and flow field of the battery modules used in the power grid energy storage system.The simulation results show that there is a large difference in the fluid flow between the top layer and the bottom layer of the battery modules,leading a large uneven temperature difference between different layers of the battery module.By improving the front and rear doors of the battery cabinet,the front and rear main air passages were optimized to reduce the maximum temperature in the battery cabinet.Then,by adding deflector plates on the cabinet door,the uniformity of temperature field and flow field distribution in the battery cabinet was improved,and the temperature difference between different battery modules was effectively reduced.

Research and Application of System Integration Technology for 100 MWh Energy Storage Power Station on New Energy Field

CHEN Shifeng, CHEN Beihai, SUN Yumin, ZHANG Zhenhua, LI Xiangjun, LIU Huaizhao

2020, 0(10):  47-54.  doi:10.16628/j.cnki.2095-8188.2020.10.008

Asbtract ( 648 )   HTML ( 25)   PDF (3527KB) ( 375 )  

Figures and Tables | References | Related Articles | Metrics

The system integration of 100 MWh-class energy storage power station was described,the design technology of a prefabricated cabin was introduced,and the typical application mode and control strategy of energy storage under the new energy grid connection were analyzed.The results of simulation and actual operation were verified.The theory and practice show that it can effectively solve a series of problems existing in large-scale new energy grid-connected,and it has certain demonstration significance.

Energy Storage Control Technology

Mixed Energy Storage Participating in Capacity Optimization Configuration of Wind Power Primary Frequency Regulation

LIU Yingming, CHEN Liang, WANG Xiaodong, WANG Yingwei

2020, 0(10):  55-63.  doi:10.16628/j.cnki.2095-8188.2020.10.009

Asbtract ( 281 )   HTML ( 5)   PDF (1605KB) ( 351 )  

Figures and Tables | References | Related Articles | Metrics

Wind power schedulability and frequency stability can be improved with wind power clusters equipped with hybrid energy storage systems.This paper is based on wind power standby and hybrid energy storage system participating in one frequency modulation.The maximization of the revenue of the wind energy cluster combined hybrid energy storage system is as the target.The whale algorithm that is not easy to fall into the local optimal solution is used to solve it,and the wind power cluster standby ratio and the optimal configuration scheme of hybrid energy storage are obtained.The impact of the wind power reserve ratio on the maximum revenue of the wind power cluster and the battery capacity configuration and the impact of hybrid energy storage on the battery life are analyzed,and the optimization results of the wind power cluster and the individual wind farm are compared.Finally,a wind power cluster in Northeast China is taken as an example to verify the effectiveness of the proposed method.

Research on Distributed Energy Storage Capacity Configuration for Improving Voltage of Distribution Network

QUAN Hui, YANG Shuili, LI Xiangjun, JIA Xuecui, MA Huimeng

2020, 0(10):  64-70.  doi:10.16628/j.cnki.2095-8188.2020.10.010

Asbtract ( 312 )   HTML ( 1)   PDF (1667KB) ( 305 )  

Figures and Tables | References | Related Articles | Metrics

In view of the low voltage problem of distribution network caused by the weak structure of rural power grid and long power supply radius,rationally configuring distributed energy storage has become a hot spot in current research.In order to solve the problems of capacity waste and excessive discharge depth in common calculation methods of energy storage capacity,this paper comprehensively considers the interaction between optimal configuration and operation control process,establishes a double-layer nested model for coupling calculation of energy storage system capacity configuration layer and operation control layer,takes the energy storage capacity of configuration layer as the constraint condition of system operation,and constructs a capacity correction link according to the energy storage output of control layer,and calculates the optimal capacity of energy storage system through alternate iteration.Finally,taking the actual operation data of a rural power grid as an example,the simulation analysis shows that the proposed method can effectively reduce the fixed energy storage capacity,reduce the initial investment cost,and improve the operation economy at the same time,which has strong practicability and popularization value.

Study on Coordinated Control of Battery Energy Storage System in Wind Farms Connected to Power Grid

ZHAO Jing, WAN Ruini, GUO Min, ZHU Yue

2020, 0(10):  71-76.  doi:10.16628/j.cnki.2095-8188.2020.10.011

Asbtract ( 446 )   HTML ( 5)   PDF (1295KB) ( 370 )  

Figures and Tables | References | Related Articles | Metrics

The simulation model of battery energy storage system(BESS) connected to the power grid with DC/DC converter and DC/AC converter was built,and the control strategies were developed.The wind power generating system with fixed speed induction wind turbines and doubly-fed induction wind turbines connected to the power grid with BESS was built in the PSCAD/EMTDC.According to the steady-state and fault-state of the power gird,the corresponding control strategy of BESS was developed.The research results show that the flexible active power control ability of the BESS can smooth the power fluctuation caused by the changing wind speed.Under the fault-state,the BESS can provide the reactive power support to stabilize the grid voltage and improve the low voltage ride-through(LVRT) ability of the wind farm.

Coordination Control Strategy of Energy Storage Participating in Grid Voltage Regulation and Dynamic Reactive Power Support

HUANG Jiyuan, HUANG Keqi, YANG Jun, HUANG Zhiguo, ZHANG Bingyu, ZENG Linjun

2020, 0(10):  77-83.  doi:10.16628/j.cnki.2095-8188.2020.10.012

Asbtract ( 430 )   HTML ( 4)   PDF (1454KB) ( 369 )  

Figures and Tables | References | Related Articles | Metrics

In order to expand the application space of battery energy storage power stations and improve the power grid voltage regulation capability,a coordinated control strategy for energy storage applied to grid voltage regulation and dynamic reactive power support was proposed.Based on the active-reactive power(PQ) control mode of the energy storage power conversion system,the grid voltage stability condition is taken as the constraint,and the goal is to provide reactive power support to the grid quickly and accurately.A basic reactive power control strategy is proposed.Based on it,the voltage state perception index is constructed to accurately describe the current grid operation state,and then identify the grid state and propose a coordinated reactive power control strategy.The simulation verification shows that the proposed strategy is highly reliable,and energy storage can play its rapid response advantages in both auxiliary conventional voltage regulation and dynamic reactive power support,and has a significant improvement effect on the grid voltage.

Research on Capacity Design of Power-Side Energy Storage Participating in Grid Frequency Modulation

WANG Junjie, SUN Jia, XU Meng, ZHANG Jinyi, GUO Xiaoyu, ZHANG Guoqiang

2020, 0(10):  84-89.  doi:10.16628/j.cnki.2095-8188.2020.10.013

Asbtract ( 255 )   HTML ( 2)   PDF (1881KB) ( 266 )  

Figures and Tables | References | Related Articles | Metrics

The rapid development of the national economy has brought relatively unbalanced load distribution,which brings greater challenges to the stability of the grid frequency.Thermal power units have stronger stability than renewable energy,so they need to play a more important role in grid frequency regulation.In addition,with the increase in the proportion of renewable energy power generation in our country,the pressure on the grid frequency adjustment that thermal power units need to bear is gradually increasing.The automatic generation control(AGC) auxiliary service policy has brought new opportunities and challenges to the development of energy storage technologies.This article analyzes the actual output data of a thermal power unit in Central China,the optimal configuration plan for power-side energy storage participating in grid frequency modulation is given by comparing the benefits of different configurations of energy storage participating in auxiliary services.The algorithm proposed in this article provides a design reference for subsequent thermal power units equipped with energy storage to participate in grid frequency modulation auxiliary services,also helps to improve the consumption of renewable energy.

Optimal Local Voltage Control Strategy for Energy Storage Considering Global Optimization

ZHANG Qiang, WU Yanan, GE Le

2020, 0(10):  90-97.  doi:10.16628/j.cnki.2095-8188.2020.10.014

Asbtract ( 302 )   HTML ( 0)   PDF (1733KB) ( 246 )  

Figures and Tables | References | Related Articles | Metrics

In order to solve the problem of grid voltage overrun caused by high-permeability photovoltaics,give full play to the ability of photovoltaic reactive power and energy storage reactive power to adjust voltage,follow the concept of global voltage optimization and local autonomy,this paper proposed a combination of centralized and local control the two-stage coordinated voltage control strategy.Firstly,on the minute-level time scale,the global optimization is carried out based on the opportunity-constrained power flow method,and the curve-fitting method is used to generate the in-situ voltage control curve of optimal energy storage and photovoltaic.Then,the local controller monitors the voltage of the local grid connection point in real time,adjusts the power output according to the optimal control curve,and realizes the local real-time control of energy storage and photovoltaic.It can make up for the two deficiencies from the time scale to obtain the best voltage control effect.Finally,a simulation example is used to verify the effectiveness of the proposed voltage control strategy in alleviating the voltage over-limit problem and reducing the network loss.

Research on Double-Layer Power Distribution Strategy Based on All-Vanadium Flow Battery Multi-Energy Storage Module

LI Wenqi, GAO Dongxue, LI Zhaohui, RAO Yufei, SUN Xin

2020, 0(10):  98-106.  doi:10.16628/j.cnki.2095-8188.2020.10.015

Asbtract ( 336 )   HTML ( 3)   PDF (2097KB) ( 185 )  

Figures and Tables | References | Related Articles | Metrics

Combined with the flow battery energy storage power station architecture and control method,the power distribution technology based on the DC bus parallel battery module is researched,and a double-layer power distribution strategy of multiple energy storage modules is proposed to achieve multiple flow battery storage on the DC side.The SOC of the module can be quickly and dynamically balanced.Combined with actual calculation examples,the effectiveness of the strategy is verified by comparing the power sharing and hierarchical switching strategies.

Application

Analysis on Potential Safety Hazards and Solutions in Construction of Electrochemical Energy Storage Power Station

AN Kun, TIAN Zheng, ZHAO Jin, ZHOU Xichao, WANG Nan

2020, 0(10):  107-113.  doi:10.16628/j.cnki.2095-8188.2020.10.016

Asbtract ( 527 )   HTML ( 6)   PDF (1962KB) ( 420 )  

Figures and Tables | References | Related Articles | Metrics

Electrochemical energy storage is a key technology to promote the replacement of main energy from fossil energy to renewable energy,and it is also an important means to improve the security,flexibility and economy of traditional power system.With the construction of large-scale electrochemical energy storage power station,all kinds of potential safety hazards are exposed more and more.How to do a good job in the construction of various safety precautions is the primary problem in the construction of electrochemical energy storage power station.This paper mainly analyzes and identifies the common safety problems existing in the construction of energy storage power station,and puts forward various safety countermeasures,aiming to improve the safety management level of electrochemical energy storage power station construction,and provides a way to solve the safety construction problems of electrochemical energy storage power station.

Analysis on Reliability Problems of Electrical System in Satellite and Rocket

LI Qiang, LIN Yigang, YE Xuerong, ZHAI Guofu

2020, 0(10):  114-122.  doi:10.16628/j.cnki.2095-8188.2020.10.017

Asbtract ( 341 )   HTML ( 5)   PDF (1661KB) ( 348 )  

References | Related Articles | Metrics

The launch schedule and reliability of recent launch vehicles around the world were briefly reviewed at first,and the typical studies carried out by China,United States,and Russia on the reliability of satellite and rocket were enumerated.Then,four key problems in the reliability research of electrical system in satellite and rocket were summarized from two aspects of working failure and storage failure.Finally,according to these key problems,the possible future development direction of the reliability research of electrical system in satellite and rocket was discussed.

Application Research of Evolutional Game Theory for Electric Heating Project in Urunqi

NING Chao, YANG Zhen, BA Te, LI Yanhui, MENG Changying, LU Quan, ZHANG Junna

2020, 0(10):  123-126.  doi:10.16628/j.cnki.2095-8188.2020.10.018

Asbtract ( 187 )   HTML ( 2)   PDF (924KB) ( 233 )  

Figures and Tables | References | Related Articles | Metrics

The energy structure transformation proposed in 13th 5-Year plan has been carried well in Northwest China.A series of policies has been proposed in order to facilitate the growth rate of renewable energies.However,since the geographical limits,the unbalanced source-load distribution is limiting the further development of renewable energies.Exploring the effective ways of renewable energy consumption has become the top priority task for governments.Xinjiang government has proposed an electrified Xinjiang project which aims to make the traditional fossil-fuel heating system be replaced by electrical heating system.By using this system,the abundant clean energies can be consumed,the wind/photovoltaic curtailment can be reduced,and the energy structure can be upgraded.This paper focuses on the electrical Urumqi project (which is a part of electrified Xinjiang project),analyzes some factors influencing its promotion and optimize its promotion plan using evolutional game theory.The results show greater profits can be achieved by this method without damaging the profits of other players if each player could make some compromise.