A series connected power semiconductor array, with digital control capability could be used for developing single phase AC regulators or other applications such as AC electronic loads. This technique together with an ...A series connected power semiconductor array, with digital control capability could be used for developing single phase AC regulators or other applications such as AC electronic loads. This technique together with an ordinary gapless transformer could be used to develop a low cost AC voltage regulator (AVR) to provide better or comparable specifications with bulky ferro-resonant AVR types. One primary advantage of the technique is that digital control can be used to minimize harmonics. Commencing with a review of AC voltage regulator techniques for single phase power conditioning systems, an analysis and design aspects of this technique is presented with experimental results for AVRs. Guidelines on how to utilize the technique in a generalized basis is also summarized together with a summary of a technique for achieving harmonic control.展开更多
Two novel improved variants of reptile search algorithm(RSA),RSA with opposition-based learning(ORSA)and hybrid ORSA with pattern search(ORSAPS),are proposed to determine the proportional,integral,and derivative(PID)c...Two novel improved variants of reptile search algorithm(RSA),RSA with opposition-based learning(ORSA)and hybrid ORSA with pattern search(ORSAPS),are proposed to determine the proportional,integral,and derivative(PID)controller parameters of an automatic voltage regulator(AVR)system using a novel objective function with augmented flexibility.In the proposed algorithms,the opposition-based learning technique improves the global search abilities of the original RSA algorithm,while the hybridization with the pattern search(PS)algorithm improves the local search abilities.Both algorithms are compared with the original RSA algorithm and have shown to be highly effective algorithms for tuning the PID controller parameters of an AVR system by getting superior results.Several analyses such as transient,stability,robustness,disturbance rejection,and trajectory tracking are conducted to test the performance of the proposed algorithms,which have validated the good promise of the proposed methods for controller designs.The performances of the proposed design approaches are also compared with the previously reported PID controller parameter tuning approaches to assess their success.It is shown that both proposed approaches obtain excellent and robust results among all compared ones.That is,with the adjustment of the weight factorα,which is introduced by the proposed objective function,for a system with high bandwitdh(α=1),the proposed ORSAPS-PID system has 2.08%more bandwidth than the proposed ORSA-PID system and 5.1%faster than the fastest algorithm from the literature.On the other hand,for a system where high phase and gain margins are desired(α=10),the proposed ORSA-PID system has 0.53%more phase margin and 2.18%more gain margin than the proposed ORSAPS-PID system and has 0.71%more phase margin and 2.25%more gain margin than the best performing algorithm from the literature.展开更多
给出了一种基于改进型主导极点配置的自动电压调节器(automatic voltage regulator,AVR)励磁系统的PID控制器设计方法.首先将对AVR系统的时域指标转化为对主导极点的要求,引入前置滤波器后,运用根轨迹法将后续闭环主导极点配置在复平面...给出了一种基于改进型主导极点配置的自动电压调节器(automatic voltage regulator,AVR)励磁系统的PID控制器设计方法.首先将对AVR系统的时域指标转化为对主导极点的要求,引入前置滤波器后,运用根轨迹法将后续闭环主导极点配置在复平面期望区域之内,得到满足要求的KP值区间.以一定步长扫描该KP值区间,得到满足期望最大灵敏度指标的KP值子区间.在子区间中选取合适的KP值,利用所给出的解析表达式,得到PID控制器的另外两个参数和前置滤波器参数,实现对AVR系统的动态响应速度和超调量指标的折中处理.仿真结果表明,本方法得出了AVR系统的性能满足期望指标要求,可与典型智能进化算法得出的性能相媲美.展开更多
电力用户负荷种类的多样化造成变压器电压波动超出允许范围,严重影响电力系统的供电质量,因此提出基于奇异值分解的配电变压器有载自动调压方法。基于奇异值分解技术提取配电变压器分接头间的电压信号,使用比例积分微分(Proportion Inte...电力用户负荷种类的多样化造成变压器电压波动超出允许范围,严重影响电力系统的供电质量,因此提出基于奇异值分解的配电变压器有载自动调压方法。基于奇异值分解技术提取配电变压器分接头间的电压信号,使用比例积分微分(Proportion Integral Differential,PID)控制算法根据分接头间电压和额定电压范围之间的偏差输出控制信号,控制触发分接开关的导通与关断,实现配电变压器的有载自动调压。实验结果表明,设计方法可以通过控制分接开关位置维持电压的平稳,且不会对负载产生不利影响。展开更多
自动电压调节器(Automatic Voltage Regulator, AVR)的性能往往受到同步发电机高场电感和连续负载变化的影响,电力系统中参数的不确定性对于系统整体性能是一个重大挑战,在设计控制策略时需要重点考虑。线性自抗扰控制(Linear Active Di...自动电压调节器(Automatic Voltage Regulator, AVR)的性能往往受到同步发电机高场电感和连续负载变化的影响,电力系统中参数的不确定性对于系统整体性能是一个重大挑战,在设计控制策略时需要重点考虑。线性自抗扰控制(Linear Active Disturbance Rejection Control, LADRC)的显著特点是能够实时估计和消除总扰动,并且不依赖于准确模型。在解决终端电压变化问题时,LADRC是一种可行的解决方案。探讨了三阶线性自抗扰控制器与高阶PID的关系,研究了线性自抗扰控制在AVR电压控制问题中的应用。针对目前AVR中普遍存在的定子电流限制(Stator Current Limit, SCL)问题,提出了一种补偿方案。方案引入发电机理论输出和实际输出的误差作为额外扰动输入,利用扩张状态观测器(Extended State Observer, ESO)对其进行估计,这样可以令线性自抗扰控制器快速补偿误差。仿真证明了与高阶PID相比,LADRC具有更强的抗干扰性,可以取得更好的控制效果。展开更多
文摘A series connected power semiconductor array, with digital control capability could be used for developing single phase AC regulators or other applications such as AC electronic loads. This technique together with an ordinary gapless transformer could be used to develop a low cost AC voltage regulator (AVR) to provide better or comparable specifications with bulky ferro-resonant AVR types. One primary advantage of the technique is that digital control can be used to minimize harmonics. Commencing with a review of AC voltage regulator techniques for single phase power conditioning systems, an analysis and design aspects of this technique is presented with experimental results for AVRs. Guidelines on how to utilize the technique in a generalized basis is also summarized together with a summary of a technique for achieving harmonic control.
文摘Two novel improved variants of reptile search algorithm(RSA),RSA with opposition-based learning(ORSA)and hybrid ORSA with pattern search(ORSAPS),are proposed to determine the proportional,integral,and derivative(PID)controller parameters of an automatic voltage regulator(AVR)system using a novel objective function with augmented flexibility.In the proposed algorithms,the opposition-based learning technique improves the global search abilities of the original RSA algorithm,while the hybridization with the pattern search(PS)algorithm improves the local search abilities.Both algorithms are compared with the original RSA algorithm and have shown to be highly effective algorithms for tuning the PID controller parameters of an AVR system by getting superior results.Several analyses such as transient,stability,robustness,disturbance rejection,and trajectory tracking are conducted to test the performance of the proposed algorithms,which have validated the good promise of the proposed methods for controller designs.The performances of the proposed design approaches are also compared with the previously reported PID controller parameter tuning approaches to assess their success.It is shown that both proposed approaches obtain excellent and robust results among all compared ones.That is,with the adjustment of the weight factorα,which is introduced by the proposed objective function,for a system with high bandwitdh(α=1),the proposed ORSAPS-PID system has 2.08%more bandwidth than the proposed ORSA-PID system and 5.1%faster than the fastest algorithm from the literature.On the other hand,for a system where high phase and gain margins are desired(α=10),the proposed ORSA-PID system has 0.53%more phase margin and 2.18%more gain margin than the proposed ORSAPS-PID system and has 0.71%more phase margin and 2.25%more gain margin than the best performing algorithm from the literature.
文摘给出了一种基于改进型主导极点配置的自动电压调节器(automatic voltage regulator,AVR)励磁系统的PID控制器设计方法.首先将对AVR系统的时域指标转化为对主导极点的要求,引入前置滤波器后,运用根轨迹法将后续闭环主导极点配置在复平面期望区域之内,得到满足要求的KP值区间.以一定步长扫描该KP值区间,得到满足期望最大灵敏度指标的KP值子区间.在子区间中选取合适的KP值,利用所给出的解析表达式,得到PID控制器的另外两个参数和前置滤波器参数,实现对AVR系统的动态响应速度和超调量指标的折中处理.仿真结果表明,本方法得出了AVR系统的性能满足期望指标要求,可与典型智能进化算法得出的性能相媲美.
文摘电力用户负荷种类的多样化造成变压器电压波动超出允许范围,严重影响电力系统的供电质量,因此提出基于奇异值分解的配电变压器有载自动调压方法。基于奇异值分解技术提取配电变压器分接头间的电压信号,使用比例积分微分(Proportion Integral Differential,PID)控制算法根据分接头间电压和额定电压范围之间的偏差输出控制信号,控制触发分接开关的导通与关断,实现配电变压器的有载自动调压。实验结果表明,设计方法可以通过控制分接开关位置维持电压的平稳,且不会对负载产生不利影响。
基金Supported by National Natural Science Foundation of China （61273260）, Specialized Research Fund for the Doctoral Program of Higher Education of China （20121333120010）, Natural Scientific Research Foundation of the Higher Education Institutions of Hebei Province （2010t65）, the Major Program of the National Natural Science Foundation of China （61290322）, Foundation of Key Labora- tory of System Control and Information Processing, Ministry of Education （SCIP2012008）, and Science and Technology Research and Development Plan of Qinhuangdao City （2012021A041）
文摘自动电压调节器(Automatic Voltage Regulator, AVR)的性能往往受到同步发电机高场电感和连续负载变化的影响,电力系统中参数的不确定性对于系统整体性能是一个重大挑战,在设计控制策略时需要重点考虑。线性自抗扰控制(Linear Active Disturbance Rejection Control, LADRC)的显著特点是能够实时估计和消除总扰动,并且不依赖于准确模型。在解决终端电压变化问题时,LADRC是一种可行的解决方案。探讨了三阶线性自抗扰控制器与高阶PID的关系,研究了线性自抗扰控制在AVR电压控制问题中的应用。针对目前AVR中普遍存在的定子电流限制(Stator Current Limit, SCL)问题,提出了一种补偿方案。方案引入发电机理论输出和实际输出的误差作为额外扰动输入,利用扩张状态观测器(Extended State Observer, ESO)对其进行估计,这样可以令线性自抗扰控制器快速补偿误差。仿真证明了与高阶PID相比,LADRC具有更强的抗干扰性,可以取得更好的控制效果。
