针对电池储能参与区域电力系统二次调频,提出了一种基于模糊动态分配的储能调频控制策略,解决了系统调频需求与储能荷电状态(state of charge,SOC)重构之间的矛盾,并充分发挥了储能的快速调频特性。首先分析了灵敏度与频率偏差的关系,...针对电池储能参与区域电力系统二次调频,提出了一种基于模糊动态分配的储能调频控制策略,解决了系统调频需求与储能荷电状态(state of charge,SOC)重构之间的矛盾,并充分发挥了储能的快速调频特性。首先分析了灵敏度与频率偏差的关系,确定了最佳储能参与调频深度也即分配因子值与频率偏差的关系,并提出通过计算储能分配因子的灵敏度,动态调整分配因子的储能控制策略,解决了以往研究需要制定重构策略以维持储能SOC的问题。在此基础上,考虑负荷连续大扰动下储能持续出力可能会使SOC越限,提出了一种基于超短期负荷预测和模糊控制的储能分配因子二次修正策略,可提前感知负荷变化趋势,并对分配因子进行二次修正,使储能预留充足容量来应对负荷连续大扰动。基于含电池储能的两区域互联系统的仿真算例验证了所提策略的有效性。展开更多
This paper presents a power factor corrected (PFC) new bridgeless (BL) Cuk Topologies for low power applications. A BL configuration of Cuk converter is proposed which eliminates the usage of diode bridge rectifier at...This paper presents a power factor corrected (PFC) new bridgeless (BL) Cuk Topologies for low power applications. A BL configuration of Cuk converter is proposed which eliminates the usage of diode bridge rectifier at the front end of the PFC converter, thus reducing the switching and conduction losses coupled with it. This new BL Cuk converter has two semiconductors switches. The current flow during each switching cycle interval of the converter reduces the conduction losses compared to the conventional Cuk PFC converter. It also reduces the input current ripple and Electromagnetic Interference (EMI). The inrush current during the starting period is limited and the input, output currents of the converter are continuous with minimum current ripple. Hence it is preferred mostly compared to other PFC circuits. The proposed topology works in the Discontinuous Conduction Mode (DCM) with simple control circuitry to achieve almost a unity power factor with less distortion in the input AC current. The switching of the power switches is done under zero current. The proposed PFC topologies are theoretically investigated and performance comparisons are made with the conventional rectifiers. The proposed PFC converter is simulated in MATLAB/SIMULINK with Fuzzy Logic Controller (FLC) and results are demonstrated to evaluate the effectiveness of the controller.展开更多
文摘针对电池储能参与区域电力系统二次调频,提出了一种基于模糊动态分配的储能调频控制策略,解决了系统调频需求与储能荷电状态(state of charge,SOC)重构之间的矛盾,并充分发挥了储能的快速调频特性。首先分析了灵敏度与频率偏差的关系,确定了最佳储能参与调频深度也即分配因子值与频率偏差的关系,并提出通过计算储能分配因子的灵敏度,动态调整分配因子的储能控制策略,解决了以往研究需要制定重构策略以维持储能SOC的问题。在此基础上,考虑负荷连续大扰动下储能持续出力可能会使SOC越限,提出了一种基于超短期负荷预测和模糊控制的储能分配因子二次修正策略,可提前感知负荷变化趋势,并对分配因子进行二次修正,使储能预留充足容量来应对负荷连续大扰动。基于含电池储能的两区域互联系统的仿真算例验证了所提策略的有效性。
文摘This paper presents a power factor corrected (PFC) new bridgeless (BL) Cuk Topologies for low power applications. A BL configuration of Cuk converter is proposed which eliminates the usage of diode bridge rectifier at the front end of the PFC converter, thus reducing the switching and conduction losses coupled with it. This new BL Cuk converter has two semiconductors switches. The current flow during each switching cycle interval of the converter reduces the conduction losses compared to the conventional Cuk PFC converter. It also reduces the input current ripple and Electromagnetic Interference (EMI). The inrush current during the starting period is limited and the input, output currents of the converter are continuous with minimum current ripple. Hence it is preferred mostly compared to other PFC circuits. The proposed topology works in the Discontinuous Conduction Mode (DCM) with simple control circuitry to achieve almost a unity power factor with less distortion in the input AC current. The switching of the power switches is done under zero current. The proposed PFC topologies are theoretically investigated and performance comparisons are made with the conventional rectifiers. The proposed PFC converter is simulated in MATLAB/SIMULINK with Fuzzy Logic Controller (FLC) and results are demonstrated to evaluate the effectiveness of the controller.
