More and more large capacity wind power will be integrated into power system in the future,and certain technical challenges will emerge due to the fluctuation characteristics of wind power and the complex control of p...More and more large capacity wind power will be integrated into power system in the future,and certain technical challenges will emerge due to the fluctuation characteristics of wind power and the complex control of power electronic devices inside the wind turbines(e.g.,low voltage ride through(LVRT)).By comparing a wind power integration grid with a hydropower integration grid,the special transient phenomena caused by the wind power integration is studied and simulation results are presented.Furthermore,the potential impacts on the traditional protection are discussed.Results show that the special transient phenomena can decrease the sensitivity,reliability and operation speed of conventional protections.展开更多
Because of the large-scale integration of wind power,the dynamic characteristics of power system have many uncertain effects.Based on deterministic analysis methods,traditional on-line security assessment system canno...Because of the large-scale integration of wind power,the dynamic characteristics of power system have many uncertain effects.Based on deterministic analysis methods,traditional on-line security assessment system cannot quantitatively estimate the actual operating conditions of the power system for only considering the most serious and credible accidents.Therefore,the risk theory is introduced into an on-line security assessment system and then an on-line risk assessment system for wind power is designed and implemented by combining with the dynamic security assessment system.Based on multiple data integration,the wind power disturbance probability is available and the security assessment of the power grid can obtain security indices in different aspects.The operating risk index is an expectation of severity,computed by summing up all the products of the result probability and its severity.Analysis results are reported to the dispatchers in on-line environment,while the comprehensive weak links are automatically provided to the power dispatching center.The risk assessment system in operation can verify the reasonableness of the system.展开更多
静态电压稳定性是一种理想化的稳定性概念,其扰动无限小的假设不利于强非线性的电力系统在静态电压稳定域(steady-state voltage stability region,SVSR)内的安全运行。针对功率大扰动场景下由SVSR内的边界危机所引发的吸引域骤缩问题,...静态电压稳定性是一种理想化的稳定性概念,其扰动无限小的假设不利于强非线性的电力系统在静态电压稳定域(steady-state voltage stability region,SVSR)内的安全运行。针对功率大扰动场景下由SVSR内的边界危机所引发的吸引域骤缩问题,提出了一种考虑边界危机的电压稳定域(voltage stability region considering boundary crises,BCVSR)的划分方法。首先通过流形分析研究了边界危机的发生机理及其对电压稳定性的影响。其次通过相轨迹分析验证了理论研究的结果。然后通过分岔分析研究了参数变化对直驱风电并网系统的平衡集及动态特性的影响。最后划分了系统在注入功率空间中的单参数与双参数BCVSR,并将其与SVSR进行了对比。研究结果表明,在考虑功率大扰动的情形下,BCVSR的划分排除了SVSR内的边界危机对系统电压稳定性的威胁,有助于指导电力系统在实际运行中的功率调整。展开更多
“双碳”目标下,为促进火电机组低碳发展,同时实现大规模新能源的开发和利用,综合能源系统低碳转型迫在眉睫。对此,该文集成生物质耦合发电、碳捕集以及电化工等低碳技术,提出考虑“燃煤+”耦合发电与电-碳-氢-化工耦合的综合能源虚拟电...“双碳”目标下,为促进火电机组低碳发展,同时实现大规模新能源的开发和利用,综合能源系统低碳转型迫在眉睫。对此,该文集成生物质耦合发电、碳捕集以及电化工等低碳技术,提出考虑“燃煤+”耦合发电与电-碳-氢-化工耦合的综合能源虚拟电厂(integrated energy virtual power plant,IEVPP)随机低碳调度策略,降低系统碳排放并提升系统经济性。首先,考虑“燃煤+”耦合发电与碳捕集技术,将火电机组改造为生物质混燃碳捕集电厂,分析其低碳特性;其次,考虑电-碳-氢-化工耦合过程,引入低碳化工生产单元并分析其能量流动关系,通过化工生产促进风光消纳;再次,考虑风光不确定性对系统的影响,以能源耦合、设备运行等约束构建IEVPP随机低碳调度模型;最后,以系统收益期望最大为目标,通过算例仿真验证该文所提调度策略可实现IEVPP的协调运行,提升系统经济性与低碳性。展开更多
可再生能源发电的消纳是能源利用低碳转型的关键问题,储能是平抑可再生能源发电波动的重要手段。在此背景下,针对含先进绝热压缩空气储能(advanced adiabatic compressed air energy storage,AA-CAES)和风电的电力系统,提出风电消纳的...可再生能源发电的消纳是能源利用低碳转型的关键问题,储能是平抑可再生能源发电波动的重要手段。在此背景下,针对含先进绝热压缩空气储能(advanced adiabatic compressed air energy storage,AA-CAES)和风电的电力系统,提出风电消纳的低碳调度方法,并建立能-碳追踪模型追溯负荷侧电能与碳的具体来源。首先,建立了电能-碳流追踪模型,其次,建立了AA-CAES电站运行模型和风电出力模型。之后,以常规机组运行成本、碳排放成本之和最小为优化目标,构建了含AA-CAES与风电的电力系统协同低碳调度模型。最后,以改进的IEEE 30节点系统为例,对AA-CAES/风电协同调度进行了计算与能碳溯源分析。结果表明,AA-CAES电站在电力系统中发挥了重要作用。在低负荷时段,AA-CAES电站主要处于压缩充电状态,储存电能;在高负荷时段,尤其是在风力发电出力不足时,AA-CAES电站通过膨胀放电来提供电能,有效平抑了风电的波动性。并通过能碳溯源分析,清晰地划分出AA-CAES/风电协同作用区域,显示出系统在不同负荷水平下的灵活响应能力。展开更多
台风灾害给新能源占比不断提高的电-气综合能源系统(integrated electricity-gas system,IEGS)安全稳定运行带来巨大挑战,针对目前IEGS灾中应急调度研究缺乏对台风迁移及风电波动的考虑,文章提出了一种综合考虑台风时空特性及严重风电...台风灾害给新能源占比不断提高的电-气综合能源系统(integrated electricity-gas system,IEGS)安全稳定运行带来巨大挑战,针对目前IEGS灾中应急调度研究缺乏对台风迁移及风电波动的考虑,文章提出了一种综合考虑台风时空特性及严重风电波动的IEGS灾中应急调度方法。建立台风时空模型,量化风雨影响下电-气系统元件故障时变特性,并利用信息熵理论筛选典型故障场景;基于台风的时序迁移,建立IEGS双层灾中应急调度模型,上层电力系统侧为应急鲁棒调度模型,其主问题针对台风路径下高危线路进行应急调度,子问题优化下一时刻最严重风电波动下系统的最小失负荷量,下层天然气系统侧基于信息耦合交互为电力侧提供恢复支撑,优化灾害下气网的运行状态;采取自适应交替方向乘子法(adaptive-alternating direction method of multipliers,AT-ADMM)分布式算法进行模型求解。最后通过算例验证了所提方法的有效性。展开更多
随着风电并网规模的不断增长,其出力不确定性给综合能源系统(integrated energy system,IES)的稳定经济运行带来了巨大挑战。对此,文中提出基于改进风电场景削减算法的IES低碳经济调度方法。首先,采用改进的迭代自组织数据分析算法(iter...随着风电并网规模的不断增长,其出力不确定性给综合能源系统(integrated energy system,IES)的稳定经济运行带来了巨大挑战。对此,文中提出基于改进风电场景削减算法的IES低碳经济调度方法。首先,采用改进的迭代自组织数据分析算法(iterative self-organizing data analysis technique algorithm,ISODATA)对大量历史风电场景进行聚类削减,克服传统聚类算法在聚类中心确定和数据内在特征考虑上的不足。然后,以改进阶梯碳价模型计算碳交易成本,针对含电转气-碳捕集(power to gas and carbon capture system,P2G-CCS)耦合设备的IES,建立以提升其经济性、低碳性为目标的IES优化调度模型。最后,仿真结果表明,该模型在保证系统低碳排放的同时可有效降低综合运行成本。展开更多
文摘More and more large capacity wind power will be integrated into power system in the future,and certain technical challenges will emerge due to the fluctuation characteristics of wind power and the complex control of power electronic devices inside the wind turbines(e.g.,low voltage ride through(LVRT)).By comparing a wind power integration grid with a hydropower integration grid,the special transient phenomena caused by the wind power integration is studied and simulation results are presented.Furthermore,the potential impacts on the traditional protection are discussed.Results show that the special transient phenomena can decrease the sensitivity,reliability and operation speed of conventional protections.
基金supported by National High Technology Research and Development Program of China (863 Program) (No.2011AA05A118)
文摘Because of the large-scale integration of wind power,the dynamic characteristics of power system have many uncertain effects.Based on deterministic analysis methods,traditional on-line security assessment system cannot quantitatively estimate the actual operating conditions of the power system for only considering the most serious and credible accidents.Therefore,the risk theory is introduced into an on-line security assessment system and then an on-line risk assessment system for wind power is designed and implemented by combining with the dynamic security assessment system.Based on multiple data integration,the wind power disturbance probability is available and the security assessment of the power grid can obtain security indices in different aspects.The operating risk index is an expectation of severity,computed by summing up all the products of the result probability and its severity.Analysis results are reported to the dispatchers in on-line environment,while the comprehensive weak links are automatically provided to the power dispatching center.The risk assessment system in operation can verify the reasonableness of the system.
文摘静态电压稳定性是一种理想化的稳定性概念,其扰动无限小的假设不利于强非线性的电力系统在静态电压稳定域(steady-state voltage stability region,SVSR)内的安全运行。针对功率大扰动场景下由SVSR内的边界危机所引发的吸引域骤缩问题,提出了一种考虑边界危机的电压稳定域(voltage stability region considering boundary crises,BCVSR)的划分方法。首先通过流形分析研究了边界危机的发生机理及其对电压稳定性的影响。其次通过相轨迹分析验证了理论研究的结果。然后通过分岔分析研究了参数变化对直驱风电并网系统的平衡集及动态特性的影响。最后划分了系统在注入功率空间中的单参数与双参数BCVSR,并将其与SVSR进行了对比。研究结果表明,在考虑功率大扰动的情形下,BCVSR的划分排除了SVSR内的边界危机对系统电压稳定性的威胁,有助于指导电力系统在实际运行中的功率调整。
文摘“双碳”目标下,为促进火电机组低碳发展,同时实现大规模新能源的开发和利用,综合能源系统低碳转型迫在眉睫。对此,该文集成生物质耦合发电、碳捕集以及电化工等低碳技术,提出考虑“燃煤+”耦合发电与电-碳-氢-化工耦合的综合能源虚拟电厂(integrated energy virtual power plant,IEVPP)随机低碳调度策略,降低系统碳排放并提升系统经济性。首先,考虑“燃煤+”耦合发电与碳捕集技术,将火电机组改造为生物质混燃碳捕集电厂,分析其低碳特性;其次,考虑电-碳-氢-化工耦合过程,引入低碳化工生产单元并分析其能量流动关系,通过化工生产促进风光消纳;再次,考虑风光不确定性对系统的影响,以能源耦合、设备运行等约束构建IEVPP随机低碳调度模型;最后,以系统收益期望最大为目标,通过算例仿真验证该文所提调度策略可实现IEVPP的协调运行,提升系统经济性与低碳性。
文摘可再生能源发电的消纳是能源利用低碳转型的关键问题,储能是平抑可再生能源发电波动的重要手段。在此背景下,针对含先进绝热压缩空气储能(advanced adiabatic compressed air energy storage,AA-CAES)和风电的电力系统,提出风电消纳的低碳调度方法,并建立能-碳追踪模型追溯负荷侧电能与碳的具体来源。首先,建立了电能-碳流追踪模型,其次,建立了AA-CAES电站运行模型和风电出力模型。之后,以常规机组运行成本、碳排放成本之和最小为优化目标,构建了含AA-CAES与风电的电力系统协同低碳调度模型。最后,以改进的IEEE 30节点系统为例,对AA-CAES/风电协同调度进行了计算与能碳溯源分析。结果表明,AA-CAES电站在电力系统中发挥了重要作用。在低负荷时段,AA-CAES电站主要处于压缩充电状态,储存电能;在高负荷时段,尤其是在风力发电出力不足时,AA-CAES电站通过膨胀放电来提供电能,有效平抑了风电的波动性。并通过能碳溯源分析,清晰地划分出AA-CAES/风电协同作用区域,显示出系统在不同负荷水平下的灵活响应能力。
文摘台风灾害给新能源占比不断提高的电-气综合能源系统(integrated electricity-gas system,IEGS)安全稳定运行带来巨大挑战,针对目前IEGS灾中应急调度研究缺乏对台风迁移及风电波动的考虑,文章提出了一种综合考虑台风时空特性及严重风电波动的IEGS灾中应急调度方法。建立台风时空模型,量化风雨影响下电-气系统元件故障时变特性,并利用信息熵理论筛选典型故障场景;基于台风的时序迁移,建立IEGS双层灾中应急调度模型,上层电力系统侧为应急鲁棒调度模型,其主问题针对台风路径下高危线路进行应急调度,子问题优化下一时刻最严重风电波动下系统的最小失负荷量,下层天然气系统侧基于信息耦合交互为电力侧提供恢复支撑,优化灾害下气网的运行状态;采取自适应交替方向乘子法(adaptive-alternating direction method of multipliers,AT-ADMM)分布式算法进行模型求解。最后通过算例验证了所提方法的有效性。
文摘随着风电并网规模的不断增长,其出力不确定性给综合能源系统(integrated energy system,IES)的稳定经济运行带来了巨大挑战。对此,文中提出基于改进风电场景削减算法的IES低碳经济调度方法。首先,采用改进的迭代自组织数据分析算法(iterative self-organizing data analysis technique algorithm,ISODATA)对大量历史风电场景进行聚类削减,克服传统聚类算法在聚类中心确定和数据内在特征考虑上的不足。然后,以改进阶梯碳价模型计算碳交易成本,针对含电转气-碳捕集(power to gas and carbon capture system,P2G-CCS)耦合设备的IES,建立以提升其经济性、低碳性为目标的IES优化调度模型。最后,仿真结果表明,该模型在保证系统低碳排放的同时可有效降低综合运行成本。
