The integration of renewable energy,such as PV and wind power,has exerted great impacts on the power system with its rapid development.If the corresponding energy storage system is configured,the power system could be...The integration of renewable energy,such as PV and wind power,has exerted great impacts on the power system with its rapid development.If the corresponding energy storage system is configured,the power system could be able to hold a higher proportion of renewable energy.Focusing on energy storage application for the output fluctuation mitigation of renewable energy,this paper first analyses the reason for renewable energy power fluctuation mitigation from the four aspects of frequency,unit ramp,low frequency oscillation and cascading failure.In addition,the fluctuation rate standard of grid-connected renewable energy,the energy storage type and the mitigation topology are introduced.Then a summary and analysis on mitigation strategy and hybrid energy storage allocation strategy are presented.Finally,the demonstration application and development trend of energy storage are analyzed to provide reference for the promotion of energy storage in renewable energy.展开更多
分布式电池储能系统(battery energy storage system,BESS)在含高比例分布式电源(distributed generation,DG)的配电网中发挥着重要作用,如负荷平移、电压管理及降损等,而BESS的作用能否得到充分利用很大程度上取决于其配置。提出了一...分布式电池储能系统(battery energy storage system,BESS)在含高比例分布式电源(distributed generation,DG)的配电网中发挥着重要作用,如负荷平移、电压管理及降损等,而BESS的作用能否得到充分利用很大程度上取决于其配置。提出了一种针对含高比例DG不平衡配网的BESS优化配置模型。模型计及了时变负荷和DG出力及分时电价的影响,并以BESS一次投资和运维成本最小及降损和削峰填谷收益最大为优化目标。针对上述典型混合整型非线性规划问题和配网优化潮流问题,采用粒子群优化算法和直接潮流算法进行联合求解。在此基础上,为提高BESS配置的合理性和经济性,提出一种基于综合损耗灵敏度分析的新型序次配置策略。最后,通过澳大利亚真实配网开展仿真分析,验证所提BESS优化配置模型和序次配置策略的可行性、有效性与优越性。展开更多
自动电压控制(automatic voltage control,AVC)技术对保证电力系统安全、优质、稳定与环保运行意义重大。回顾了自动电压控制技术的发展历史,提出了在大规模复杂电网实施自动电压控制的关键技术挑战,并进一步阐述了应对这些挑战的自律...自动电压控制(automatic voltage control,AVC)技术对保证电力系统安全、优质、稳定与环保运行意义重大。回顾了自动电压控制技术的发展历史,提出了在大规模复杂电网实施自动电压控制的关键技术挑战,并进一步阐述了应对这些挑战的自律协同思想与电压控制关键技术,包括巨型电网安全与经济协同优化技术、支撑大规模可再生能源可靠接入的自律协同电压控制技术、以及基于自适应架构的递阶协同电压控制方法。最后,结合中国电网的现实需求与变化趋势,对未来自动电压控制技术的发展方向进行了展望。展开更多
In this work,a PSCAD electromagnetic model is constructed for a microgrid community.It consists of three microgrids networked through the medium voltage(MV)distribution system as a practical case of the distributed re...In this work,a PSCAD electromagnetic model is constructed for a microgrid community.It consists of three microgrids networked through the medium voltage(MV)distribution system as a practical case of the distributed resource island systems of IEEE Standard 1547.4.Typical operational scenarios are then simulated for both grid connected and islanded mode of operation.The study outcomes demonstrate the operational feasibility of networked microgrids in electrical distribution systems and the effectiveness of common droop controls in facilitating energy transaction of the microgrids and maintaining voltage and frequency stabilities under normal network disturbances.This investigation is significant in that it addresses the needs and issues arising from primary controls for facilitating the energy transactions of secondary and tertiary controls in the hierarchical control strategy of networked microgrids in the MV distribution system.Future studies of the secondary and tertiary control algorithms will need to incorporate new requirements for ensuring distribution system voltage and frequency securities.展开更多
The increasing interdependency of electricity and natural gas systems promotes coordination of the two systems for ensuring operational security and economics.This paper proposes a robust day-ahead scheduling model fo...The increasing interdependency of electricity and natural gas systems promotes coordination of the two systems for ensuring operational security and economics.This paper proposes a robust day-ahead scheduling model for the optimal coordinated operation of integrated energy systems while considering key uncertainties of the power system and natural gas system operation cost. Energy hub,with collocated gas-fired units, power-to-gas(Pt G) facilities, and natural gas storages, is considered to store or convert one type of energy(i.e., electricity or natural gas)into the other form, which could analogously function as large-scale electrical energy storages. The column-andconstraint generation(C&CG) is adopted to solve the proposed integrated robust model, in which nonlinear natural gas network constraints are reformulated via a set of linear constraints. Numerical experiments signify the effectiveness of the proposed model for handling volatile electrical loads and renewable generations via the coordinated scheduling of electricity and natural gas systems.展开更多
电网电压跌落时,静止无功发生器(Static Var Generator,SVG)和逆变型新能源都能够主动支撑电网电压,但存在支撑能力不足、电流越限等运行风险。根据新能源场站的实际无功配置情况,提出了一种基于静止无功发生器(Static Var Generator,S...电网电压跌落时,静止无功发生器(Static Var Generator,SVG)和逆变型新能源都能够主动支撑电网电压,但存在支撑能力不足、电流越限等运行风险。根据新能源场站的实际无功配置情况,提出了一种基于静止无功发生器(Static Var Generator,SVG)与新能源发电单元的无功协调控制策略,提高了新能源场站的主动电压支撑能力。首先,研究了SVG与新能源发电单元的协调控制方法,在并网点(Point of Common Coupling,PCC)不平衡电压跌落场景下,实现了并网点电压支撑、电压不平衡度提升、电流限幅等多控制目标。接着,提出了电压跌落场景的分类方法,并在每个具体场景下优化主动电压协调控制方法。最后,利用Matlab/Simulink仿真平台,验证了该方法的有效性。相比于传统方法中仅依靠新能源装置实现电压支撑,提出的协调控制方法能有效地解决严重电压跌落情况下单个新能源发电单元支撑能力不足的问题,为新能源场站的电压支撑方法提供了新的思路。展开更多
文摘有效协调小容量分布式发电(distributed generation,DG)和集中式可再生能源发电(collected renewable generation,CRG)是中国未来智能电网发展的重要特征。分散储能系统(distributed energy storage system,DESS)和集中储能系统(mass energy storage system,MESS)将在大容量CRG和小容量DG的安全、稳定接入大电网中发挥重大作用。文中在对智能电网兼容性问题进行深入分析的基础上,探讨了考虑电网供蓄特性的协同调度,提出了涵盖输配电网CRG-MESS供蓄配置以及微网DG-DESS供蓄配置的智能电网兼容性解决方案。
文摘The integration of renewable energy,such as PV and wind power,has exerted great impacts on the power system with its rapid development.If the corresponding energy storage system is configured,the power system could be able to hold a higher proportion of renewable energy.Focusing on energy storage application for the output fluctuation mitigation of renewable energy,this paper first analyses the reason for renewable energy power fluctuation mitigation from the four aspects of frequency,unit ramp,low frequency oscillation and cascading failure.In addition,the fluctuation rate standard of grid-connected renewable energy,the energy storage type and the mitigation topology are introduced.Then a summary and analysis on mitigation strategy and hybrid energy storage allocation strategy are presented.Finally,the demonstration application and development trend of energy storage are analyzed to provide reference for the promotion of energy storage in renewable energy.
文摘分布式电池储能系统(battery energy storage system,BESS)在含高比例分布式电源(distributed generation,DG)的配电网中发挥着重要作用,如负荷平移、电压管理及降损等,而BESS的作用能否得到充分利用很大程度上取决于其配置。提出了一种针对含高比例DG不平衡配网的BESS优化配置模型。模型计及了时变负荷和DG出力及分时电价的影响,并以BESS一次投资和运维成本最小及降损和削峰填谷收益最大为优化目标。针对上述典型混合整型非线性规划问题和配网优化潮流问题,采用粒子群优化算法和直接潮流算法进行联合求解。在此基础上,为提高BESS配置的合理性和经济性,提出一种基于综合损耗灵敏度分析的新型序次配置策略。最后,通过澳大利亚真实配网开展仿真分析,验证所提BESS优化配置模型和序次配置策略的可行性、有效性与优越性。
文摘自动电压控制(automatic voltage control,AVC)技术对保证电力系统安全、优质、稳定与环保运行意义重大。回顾了自动电压控制技术的发展历史,提出了在大规模复杂电网实施自动电压控制的关键技术挑战,并进一步阐述了应对这些挑战的自律协同思想与电压控制关键技术,包括巨型电网安全与经济协同优化技术、支撑大规模可再生能源可靠接入的自律协同电压控制技术、以及基于自适应架构的递阶协同电压控制方法。最后,结合中国电网的现实需求与变化趋势,对未来自动电压控制技术的发展方向进行了展望。
文摘In this work,a PSCAD electromagnetic model is constructed for a microgrid community.It consists of three microgrids networked through the medium voltage(MV)distribution system as a practical case of the distributed resource island systems of IEEE Standard 1547.4.Typical operational scenarios are then simulated for both grid connected and islanded mode of operation.The study outcomes demonstrate the operational feasibility of networked microgrids in electrical distribution systems and the effectiveness of common droop controls in facilitating energy transaction of the microgrids and maintaining voltage and frequency stabilities under normal network disturbances.This investigation is significant in that it addresses the needs and issues arising from primary controls for facilitating the energy transactions of secondary and tertiary controls in the hierarchical control strategy of networked microgrids in the MV distribution system.Future studies of the secondary and tertiary control algorithms will need to incorporate new requirements for ensuring distribution system voltage and frequency securities.
基金supported in part by the U.S.National Science Foundation Grant(No.CMMI-1635339)
文摘The increasing interdependency of electricity and natural gas systems promotes coordination of the two systems for ensuring operational security and economics.This paper proposes a robust day-ahead scheduling model for the optimal coordinated operation of integrated energy systems while considering key uncertainties of the power system and natural gas system operation cost. Energy hub,with collocated gas-fired units, power-to-gas(Pt G) facilities, and natural gas storages, is considered to store or convert one type of energy(i.e., electricity or natural gas)into the other form, which could analogously function as large-scale electrical energy storages. The column-andconstraint generation(C&CG) is adopted to solve the proposed integrated robust model, in which nonlinear natural gas network constraints are reformulated via a set of linear constraints. Numerical experiments signify the effectiveness of the proposed model for handling volatile electrical loads and renewable generations via the coordinated scheduling of electricity and natural gas systems.
文摘电网电压跌落时,静止无功发生器(Static Var Generator,SVG)和逆变型新能源都能够主动支撑电网电压,但存在支撑能力不足、电流越限等运行风险。根据新能源场站的实际无功配置情况,提出了一种基于静止无功发生器(Static Var Generator,SVG)与新能源发电单元的无功协调控制策略,提高了新能源场站的主动电压支撑能力。首先,研究了SVG与新能源发电单元的协调控制方法,在并网点(Point of Common Coupling,PCC)不平衡电压跌落场景下,实现了并网点电压支撑、电压不平衡度提升、电流限幅等多控制目标。接着,提出了电压跌落场景的分类方法,并在每个具体场景下优化主动电压协调控制方法。最后,利用Matlab/Simulink仿真平台,验证了该方法的有效性。相比于传统方法中仅依靠新能源装置实现电压支撑,提出的协调控制方法能有效地解决严重电压跌落情况下单个新能源发电单元支撑能力不足的问题,为新能源场站的电压支撑方法提供了新的思路。
