梯级水光蓄互补发电系统将梯级小水电(cascade small hydropowerplant,CSHP)、分布式光伏(photovoltaic,PV)和抽水蓄能相结合,可平抑PV功率波动、提高其可调度性。针对这种互补发电系统的实时控制问题,首先提出了基于经验模态分解法(emp...梯级水光蓄互补发电系统将梯级小水电(cascade small hydropowerplant,CSHP)、分布式光伏(photovoltaic,PV)和抽水蓄能相结合,可平抑PV功率波动、提高其可调度性。针对这种互补发电系统的实时控制问题,首先提出了基于经验模态分解法(empirical mode decomposition,EMD)的全功率变速恒频抽蓄机组(full size converter based variable speed constant frequency pumped storage unit,FSC-VSCFPSU)平抑PV功率波动控制策略,根据经EMD法提取的PV功率波动的高低频分量,自适应确定平抑目标,快速为FSCVSCFPSU确定所需的补偿功率。其次,提出了基于CSHP与FSC-VSCFPSU协调控制的互补发电系统跟踪调度计划策略,在平抑PV功率波动控制策略处理的基础上,根据调度计划协调分配CSHP及FSC-VSCFPSU的输出功率,以最小化系统出力与调度计划的偏差,确保系统平稳跟踪调度计划运行。此外,还给出了基于变速运行模式的FSCVSCFPSU虚拟同步机控制策略,通过模拟同步机特性来控制机组的全功率变流器运行,实现FSC-VSCFPSU的快速功率响应,保证平抑PV功率波动控制策略及跟踪调度计划策略的有效执行。通过实例仿真计算和分析验证了所提控制策略的有效性和可行性。展开更多
This paper presents a novel design procedure for optimizing the power distribution strategy in distributed generation system. A coordinating controller, responsible to distribute the total load power request among mul...This paper presents a novel design procedure for optimizing the power distribution strategy in distributed generation system. A coordinating controller, responsible to distribute the total load power request among multiple DG units, is suggested based on the conception of hierarchical control structure in the dynamic system. The optimal control problem was formulated as a nonlinear optimization problem subject to set of constraints. The resulting problem was solved using the Kuhn-Tucker method. Computer simulation results demonstrate that the proposed method can provide better efficiency in terms of reducing total costs compared to existing methods. In addition, the proposed optimal load distribution strategy can be easily implemented in real-time thanks to the simplicity of closed-form solutions.展开更多
文摘梯级水光蓄互补发电系统将梯级小水电(cascade small hydropowerplant,CSHP)、分布式光伏(photovoltaic,PV)和抽水蓄能相结合,可平抑PV功率波动、提高其可调度性。针对这种互补发电系统的实时控制问题,首先提出了基于经验模态分解法(empirical mode decomposition,EMD)的全功率变速恒频抽蓄机组(full size converter based variable speed constant frequency pumped storage unit,FSC-VSCFPSU)平抑PV功率波动控制策略,根据经EMD法提取的PV功率波动的高低频分量,自适应确定平抑目标,快速为FSCVSCFPSU确定所需的补偿功率。其次,提出了基于CSHP与FSC-VSCFPSU协调控制的互补发电系统跟踪调度计划策略,在平抑PV功率波动控制策略处理的基础上,根据调度计划协调分配CSHP及FSC-VSCFPSU的输出功率,以最小化系统出力与调度计划的偏差,确保系统平稳跟踪调度计划运行。此外,还给出了基于变速运行模式的FSCVSCFPSU虚拟同步机控制策略,通过模拟同步机特性来控制机组的全功率变流器运行,实现FSC-VSCFPSU的快速功率响应,保证平抑PV功率波动控制策略及跟踪调度计划策略的有效执行。通过实例仿真计算和分析验证了所提控制策略的有效性和可行性。
基金Sponsored by the Indiana 21stCentury Research and Technology Fund
文摘This paper presents a novel design procedure for optimizing the power distribution strategy in distributed generation system. A coordinating controller, responsible to distribute the total load power request among multiple DG units, is suggested based on the conception of hierarchical control structure in the dynamic system. The optimal control problem was formulated as a nonlinear optimization problem subject to set of constraints. The resulting problem was solved using the Kuhn-Tucker method. Computer simulation results demonstrate that the proposed method can provide better efficiency in terms of reducing total costs compared to existing methods. In addition, the proposed optimal load distribution strategy can be easily implemented in real-time thanks to the simplicity of closed-form solutions.
