The impact of power fluctuation caused by renewable sources is highly negative. This article discusses the idea of an energy capacitor system (ECS) which regulates the power balance in a distribution system based on M...The impact of power fluctuation caused by renewable sources is highly negative. This article discusses the idea of an energy capacitor system (ECS) which regulates the power balance in a distribution system based on Multi-Agent System (MAS). Energy Capacitor system as a storage device plays the main role to control the system’s power quality by absorbing the fluctuations. Load Following Operation (LFO) process and coordination control scheme between the ECS and diesel generator have been introduced. Results show the efficient utilization of the ECS based on a special index defined in this paper to evaluate the power fluctuations in the distribution system. The results also show the useful implementation of the control scheme by revealing the capability of keeping the ECS stored energy in the specified range.展开更多
在含非线性负载的光伏并网系统中,光伏发电单元、非线性负载、电网三者之间的相互作用可能导致系统出现振荡,因此提出一种改进的电容电流反馈有源阻尼(capacitor current feedback active damping, CCFAD)控制方法。首先,采用谐波线性...在含非线性负载的光伏并网系统中,光伏发电单元、非线性负载、电网三者之间的相互作用可能导致系统出现振荡,因此提出一种改进的电容电流反馈有源阻尼(capacitor current feedback active damping, CCFAD)控制方法。首先,采用谐波线性化方法建立含非线性负载的光伏并网系统序阻抗模型,并基于阻抗模型和对数频率稳定判据揭示含非线性负载的光伏并网系统振荡特性。随后,基于负电阻理论定义阻抗相对灵敏度指标,评价不同参数变化对系统阻抗特性的影响程度,获取影响系统稳定性的关键参数。基于不同参数的阻抗相对灵敏度分析,提出一种改进的CCFAD方法。该方法拓展了传统CCFAD的正阻尼区域,有效地改善了系统输出阻抗的相位裕度,提高了系统稳定性。最后,在Matlab/Simulink中搭建仿真模型,验证了分析方法的正确性和所提控制策略的有效性。展开更多
This paper presents a binary gravitational search algorithm (BGSA) is applied to solve the problem of optimal allotment of DG sets and Shunt capacitors in radial distribution systems. The problem is formulated as a no...This paper presents a binary gravitational search algorithm (BGSA) is applied to solve the problem of optimal allotment of DG sets and Shunt capacitors in radial distribution systems. The problem is formulated as a nonlinear constrained single-objective optimization problem where the total line loss (TLL) and the total voltage deviations (TVD) are to be minimized separately by incorporating optimal placement of DG units and shunt capacitors with constraints which include limits on voltage, sizes of installed capacitors and DG. This BGSA is applied on the balanced IEEE 10 Bus distribution network and the results are compared with conventional binary particle swarm optimization.展开更多
文摘The impact of power fluctuation caused by renewable sources is highly negative. This article discusses the idea of an energy capacitor system (ECS) which regulates the power balance in a distribution system based on Multi-Agent System (MAS). Energy Capacitor system as a storage device plays the main role to control the system’s power quality by absorbing the fluctuations. Load Following Operation (LFO) process and coordination control scheme between the ECS and diesel generator have been introduced. Results show the efficient utilization of the ECS based on a special index defined in this paper to evaluate the power fluctuations in the distribution system. The results also show the useful implementation of the control scheme by revealing the capability of keeping the ECS stored energy in the specified range.
文摘在含非线性负载的光伏并网系统中,光伏发电单元、非线性负载、电网三者之间的相互作用可能导致系统出现振荡,因此提出一种改进的电容电流反馈有源阻尼(capacitor current feedback active damping, CCFAD)控制方法。首先,采用谐波线性化方法建立含非线性负载的光伏并网系统序阻抗模型,并基于阻抗模型和对数频率稳定判据揭示含非线性负载的光伏并网系统振荡特性。随后,基于负电阻理论定义阻抗相对灵敏度指标,评价不同参数变化对系统阻抗特性的影响程度,获取影响系统稳定性的关键参数。基于不同参数的阻抗相对灵敏度分析,提出一种改进的CCFAD方法。该方法拓展了传统CCFAD的正阻尼区域,有效地改善了系统输出阻抗的相位裕度,提高了系统稳定性。最后,在Matlab/Simulink中搭建仿真模型,验证了分析方法的正确性和所提控制策略的有效性。
文摘This paper presents a binary gravitational search algorithm (BGSA) is applied to solve the problem of optimal allotment of DG sets and Shunt capacitors in radial distribution systems. The problem is formulated as a nonlinear constrained single-objective optimization problem where the total line loss (TLL) and the total voltage deviations (TVD) are to be minimized separately by incorporating optimal placement of DG units and shunt capacitors with constraints which include limits on voltage, sizes of installed capacitors and DG. This BGSA is applied on the balanced IEEE 10 Bus distribution network and the results are compared with conventional binary particle swarm optimization.
