针对传统固定权重多目标无功优化在应对新型电力系统复杂多变的工况时无法针对实时工况做出最合适的控制决策的问题,提出一种自适应多目标无功优化控制策略。该策略以系统有功网损和并网点电压偏离量的加权最小作为目标函数,目标函数的...针对传统固定权重多目标无功优化在应对新型电力系统复杂多变的工况时无法针对实时工况做出最合适的控制决策的问题,提出一种自适应多目标无功优化控制策略。该策略以系统有功网损和并网点电压偏离量的加权最小作为目标函数,目标函数的权重系数根据并网点电压的偏离情况自适应调节。首先,分析海上风电场并网点电压波动与有功、无功输出的关系,建立相应的无功分配模型,并针对风电机组及静止无功发生器(static var ge nerator,SVG)的输入输出特性,建立相应的无功控制模型。此外,考虑海上运行的功率约束、安全运行约束等,采用变惯性权重粒子群优化算法对无功控制策略进行求解。最后,在MATLAB中搭建海上风电场模型进行仿真验证,仿真算例表明:相较于传统固定权重多目标无功优化,自适应多目标无功优化控制策略可以根据电网实时工况,迅速调整各优化目标的优先级,较好地实现有功网损和并网点电压的协调优化。展开更多
为应对电网大功率缺额引发的频率跌落,充分发挥负荷侧资源的调节潜力,提出了一种主动电压控制与自动电压控制AVC(automatic voltage control)相互协调的控制策略,通过对母线电压的主动调整,改变负荷有功大小,实现提高电网稳定性的目的...为应对电网大功率缺额引发的频率跌落,充分发挥负荷侧资源的调节潜力,提出了一种主动电压控制与自动电压控制AVC(automatic voltage control)相互协调的控制策略,通过对母线电压的主动调整,改变负荷有功大小,实现提高电网稳定性的目的。首先,基于母线负荷主动响应潜力和历史数据下母线负荷的电压响应特性,结合有载变压器的接线、档位等物理状况,通过回归分析建立了负荷潜力模型和响应特性模型;其次,对大功率缺额场景及AVC系统下主动电压控制的协同原则进行了阐述,在此基础上,综合优化给出了主动电压控制中确定变压器控制优先级的方法;最后,通过IEEE10机39节点系统进行了仿真验证。仿真结果表明,母线负荷能够有效削减部分负荷功率,帮助电网应对大功率缺额问题。展开更多
Active vibration control is an effective way of increasing robustness of the design to meet the stringent accuracy requirements for space structures. This paper presents the results of active damping realized by a pie...Active vibration control is an effective way of increasing robustness of the design to meet the stringent accuracy requirements for space structures. This paper presents the results of active damping realized by a piezoelectric active member to control the vibration of a four-bay four-longern aluminum truss structure with cantilever boundary. The active member, which utilizes a piezoelectric actuating unit and an integrated load cell, is designed for vibration control of the space truss structures. Active damping control is realized using direct velocity feedback around the active member. The placement of the active member as one of the most important factor of affecting the control system performance, is also investigated by modal dissipation energy ratio as indicator. The active damping effectiveness is evaluated by comparing the closed-loop response with the open loop response.展开更多
文摘针对传统固定权重多目标无功优化在应对新型电力系统复杂多变的工况时无法针对实时工况做出最合适的控制决策的问题,提出一种自适应多目标无功优化控制策略。该策略以系统有功网损和并网点电压偏离量的加权最小作为目标函数,目标函数的权重系数根据并网点电压的偏离情况自适应调节。首先,分析海上风电场并网点电压波动与有功、无功输出的关系,建立相应的无功分配模型,并针对风电机组及静止无功发生器(static var ge nerator,SVG)的输入输出特性,建立相应的无功控制模型。此外,考虑海上运行的功率约束、安全运行约束等,采用变惯性权重粒子群优化算法对无功控制策略进行求解。最后,在MATLAB中搭建海上风电场模型进行仿真验证,仿真算例表明:相较于传统固定权重多目标无功优化,自适应多目标无功优化控制策略可以根据电网实时工况,迅速调整各优化目标的优先级,较好地实现有功网损和并网点电压的协调优化。
文摘为应对电网大功率缺额引发的频率跌落,充分发挥负荷侧资源的调节潜力,提出了一种主动电压控制与自动电压控制AVC(automatic voltage control)相互协调的控制策略,通过对母线电压的主动调整,改变负荷有功大小,实现提高电网稳定性的目的。首先,基于母线负荷主动响应潜力和历史数据下母线负荷的电压响应特性,结合有载变压器的接线、档位等物理状况,通过回归分析建立了负荷潜力模型和响应特性模型;其次,对大功率缺额场景及AVC系统下主动电压控制的协同原则进行了阐述,在此基础上,综合优化给出了主动电压控制中确定变压器控制优先级的方法;最后,通过IEEE10机39节点系统进行了仿真验证。仿真结果表明,母线负荷能够有效削减部分负荷功率,帮助电网应对大功率缺额问题。
文摘Active vibration control is an effective way of increasing robustness of the design to meet the stringent accuracy requirements for space structures. This paper presents the results of active damping realized by a piezoelectric active member to control the vibration of a four-bay four-longern aluminum truss structure with cantilever boundary. The active member, which utilizes a piezoelectric actuating unit and an integrated load cell, is designed for vibration control of the space truss structures. Active damping control is realized using direct velocity feedback around the active member. The placement of the active member as one of the most important factor of affecting the control system performance, is also investigated by modal dissipation energy ratio as indicator. The active damping effectiveness is evaluated by comparing the closed-loop response with the open loop response.
