This paper proposes a low complexity control scheme for voltage control of a dynamic voltage restorer(DVR)in a three-phase system.The control scheme employs the fractional order,proportional-integral-derivative(FOPID)...This paper proposes a low complexity control scheme for voltage control of a dynamic voltage restorer(DVR)in a three-phase system.The control scheme employs the fractional order,proportional-integral-derivative(FOPID)controller to improve on the DVR performance in order to enhance the power quality in terms of the response time,steady-state error and total harmonic distortion(THD).The result obtained was compared with fractional order,proportionalintegral(FOPI),proportional-integral-derivative(PID)and proportional-integral(PI)controllers in order to show the effectiveness of the proposed DVR control scheme.A water cycle optimization algorithm(WCA)was utilized to find the optimal set for all the controller gains.They were used to solve four power quality issues;balanced voltage sag,balanced voltage swell,unbalanced voltage sag,and unbalanced voltage swell.It showed that one set of controller gain obtained from the WCA could solve all the power quality issues while the others in the literature needed an individual set of optimal gain for each power quality problem.To prove the concept,the proposed DVR algorithm was simulated in the MATLAB/Simulink software and the results revealed that the four optimal controllers can compensate for all the power quality problems.A comparative analysis of the results in various aspects of their dynamic response and%THD was discussed and analyzed.It was found that PID controller yields the most rapid performance in terms of average response time while FOPID controller yields the best performance in term of average%steady-state error.FOPI controller was found to provide the lowest THD percentage in the average%THD.FOPID did not differ much in average response from the PID and average%THD from FOPI;however,FOPID provided the most outstanding average steady-state error.According to the CBMA curve,the dynamic responses of all controllers fall in the acceptable power quality area.The total harmonic distortion(THD)of the compensated load voltage from all the controllers were within the 8%limit in accordance to the IEEE std.519-2014.展开更多
针对传统机组运行约束挤压风电并网空间及固体废弃物堆存量激增造成的环境污染问题,配置光热电站与电加热联合运行促进风电消纳,引入垃圾焚烧电厂与电转气联合运行实现CO_(2)再利用,提出一种含光热电站(concentrating solar power plant...针对传统机组运行约束挤压风电并网空间及固体废弃物堆存量激增造成的环境污染问题,配置光热电站与电加热联合运行促进风电消纳,引入垃圾焚烧电厂与电转气联合运行实现CO_(2)再利用,提出一种含光热电站(concentrating solar power plant,CSP)及垃圾焚烧电厂(waste to energy plant,WTE)的虚拟电厂低碳优化调度模型。基于非参数核密度估计和Frank-Copula函数构建风电和光热电站出力联合分布模型,并利用蜉蝣优化K-means聚类算法得到典型场景;构建电加热与光热电站联合运行模型,并在垃圾焚烧-电转气精细化碳利用模型的基础上,引入阶梯碳交易机制进一步约束系统碳排放;以虚拟电厂总运行成本最低为目标,提出一种基于混合策略改进的水循环算法进行求解。仿真结果表明,所建立模型能够有效促进风电消纳并降低系统碳排放。展开更多
针对强背景噪声干扰下轮对轴承故障特征微弱、难以准确检测的问题,提出了一种自适应改进高斯拉普拉斯(improved Laplacian of Gaussian,简称ILoG)算子的微弱故障检测方法。ILoG算子滤波器具有优良的信号突变特征检测能力,将其用于轮对...针对强背景噪声干扰下轮对轴承故障特征微弱、难以准确检测的问题,提出了一种自适应改进高斯拉普拉斯(improved Laplacian of Gaussian,简称ILoG)算子的微弱故障检测方法。ILoG算子滤波器具有优良的信号突变特征检测能力,将其用于轮对轴承故障信号的冲击特征检测,同时利用水循环算法(water cycle algorithm,简称WCA)的寻优特性,并行搜寻筛选最佳的ILoG算子影响参数,通过对参数优化后ILoG算子滤波后信号做进一步包络解调分析,提取出轮对轴承微弱的故障特征信息。对实际轮对轴承外圈和内圈故障信号分析的结果表明,该方法可以有效检测出轴承微弱故障特征频率,故障检测效果优于小波阈值和多尺度形态学差值滤波方法。展开更多
为了应对电力系统扰动带来的稳态及暂态电压波动问题,以静止无功补偿器(static var compensator,SVC)、电容器组(capacitor bank,CB)、有载调压变压器(on load tap changing,OLTC)和同步调相机(synchronouscompensator,SC)为综合性无功...为了应对电力系统扰动带来的稳态及暂态电压波动问题,以静止无功补偿器(static var compensator,SVC)、电容器组(capacitor bank,CB)、有载调压变压器(on load tap changing,OLTC)和同步调相机(synchronouscompensator,SC)为综合性无功补偿装置,提出了一种考虑多种无功补偿装置协同优化的电压控制方法。建立多目标电压控制模型,引入多目标权重系数计算方法,并基于水循环算法(water cycle algorithm,WCA)进行模型求解。通过仿真算例验证了所提方法的有效性。展开更多
基金This Research was Financially Supported by Faculty of Engineering,Mahasarakham University(Grant year 2021).
文摘This paper proposes a low complexity control scheme for voltage control of a dynamic voltage restorer(DVR)in a three-phase system.The control scheme employs the fractional order,proportional-integral-derivative(FOPID)controller to improve on the DVR performance in order to enhance the power quality in terms of the response time,steady-state error and total harmonic distortion(THD).The result obtained was compared with fractional order,proportionalintegral(FOPI),proportional-integral-derivative(PID)and proportional-integral(PI)controllers in order to show the effectiveness of the proposed DVR control scheme.A water cycle optimization algorithm(WCA)was utilized to find the optimal set for all the controller gains.They were used to solve four power quality issues;balanced voltage sag,balanced voltage swell,unbalanced voltage sag,and unbalanced voltage swell.It showed that one set of controller gain obtained from the WCA could solve all the power quality issues while the others in the literature needed an individual set of optimal gain for each power quality problem.To prove the concept,the proposed DVR algorithm was simulated in the MATLAB/Simulink software and the results revealed that the four optimal controllers can compensate for all the power quality problems.A comparative analysis of the results in various aspects of their dynamic response and%THD was discussed and analyzed.It was found that PID controller yields the most rapid performance in terms of average response time while FOPID controller yields the best performance in term of average%steady-state error.FOPI controller was found to provide the lowest THD percentage in the average%THD.FOPID did not differ much in average response from the PID and average%THD from FOPI;however,FOPID provided the most outstanding average steady-state error.According to the CBMA curve,the dynamic responses of all controllers fall in the acceptable power quality area.The total harmonic distortion(THD)of the compensated load voltage from all the controllers were within the 8%limit in accordance to the IEEE std.519-2014.
文摘针对传统机组运行约束挤压风电并网空间及固体废弃物堆存量激增造成的环境污染问题,配置光热电站与电加热联合运行促进风电消纳,引入垃圾焚烧电厂与电转气联合运行实现CO_(2)再利用,提出一种含光热电站(concentrating solar power plant,CSP)及垃圾焚烧电厂(waste to energy plant,WTE)的虚拟电厂低碳优化调度模型。基于非参数核密度估计和Frank-Copula函数构建风电和光热电站出力联合分布模型,并利用蜉蝣优化K-means聚类算法得到典型场景;构建电加热与光热电站联合运行模型,并在垃圾焚烧-电转气精细化碳利用模型的基础上,引入阶梯碳交易机制进一步约束系统碳排放;以虚拟电厂总运行成本最低为目标,提出一种基于混合策略改进的水循环算法进行求解。仿真结果表明,所建立模型能够有效促进风电消纳并降低系统碳排放。
文摘为了应对电力系统扰动带来的稳态及暂态电压波动问题,以静止无功补偿器(static var compensator,SVC)、电容器组(capacitor bank,CB)、有载调压变压器(on load tap changing,OLTC)和同步调相机(synchronouscompensator,SC)为综合性无功补偿装置,提出了一种考虑多种无功补偿装置协同优化的电压控制方法。建立多目标电压控制模型,引入多目标权重系数计算方法,并基于水循环算法(water cycle algorithm,WCA)进行模型求解。通过仿真算例验证了所提方法的有效性。
