为了消除调速器死区非线性对系统的影响和保证系统稳定,针对存在调速器死区的负荷频率控制(load frequency control,LFC)系统,采用了自抗扰控制(active disturbance rejection control,ADRC)方法,并通过描述函数法验证控制方法的有效性...为了消除调速器死区非线性对系统的影响和保证系统稳定,针对存在调速器死区的负荷频率控制(load frequency control,LFC)系统,采用了自抗扰控制(active disturbance rejection control,ADRC)方法,并通过描述函数法验证控制方法的有效性。提出死区线性化方法,并采用了广义自抗扰控制(generalized active disturbance rejection control,GADRC)方法。为能有效地消除死区非线性,提出了一种误差补偿策略。仿真结果显示,提出的误差补偿策略能有效地消除死区非线性,保证了系统的控制性能。提出通过描述函数法获得补偿系数的取值范围也是可行。展开更多
Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric ...Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric grid interfacing custom power device （CPD） is controlled to perform the smart exchanging of electric power as per the Indian grid code. WE is connected to DC link of CPD for the grid integration purpose. The CPD based distributed static compensator, i.e. the distributed static synchronous compensator （DSTATCOM）, is utilized for injecting the wind power to the point of common coupling （PCC） and also acts against the reactive power demand. The novel indirect current control scheme of DSTATCOM regulates the power import and export between the WE and the electric grid system. It also acts as a compensator and performs both the key features simultaneously. Hence, the penetration of additional generated WE power to the grid is increased by 20% to 25%. The burden of reactive power compensation from grid is reduced by DSTATCOM. The modeling and simulation are done in MATLAB. The results are validated and verified.展开更多
针对一类有限能量拒绝服务(denial of service,DoS)攻击与执行器故障共存的工业信息物理系统(industry cyber-physical system,ICPS),研究了综合安全控制与通信协同设计问题。首先,考虑单侧网络遭受DoS攻击的情形,构建了ICPS综合安全控...针对一类有限能量拒绝服务(denial of service,DoS)攻击与执行器故障共存的工业信息物理系统(industry cyber-physical system,ICPS),研究了综合安全控制与通信协同设计问题。首先,考虑单侧网络遭受DoS攻击的情形,构建了ICPS综合安全控制架构,并从防御者的视角通过分析不同能量级DoS攻击对系统的影响差异,制定了相应的能量分级标准;其次,设计了DoS攻击的能量分级检测机制,并对小能量攻击以弹性控制鲁棒应对,对大能量攻击提出了一种PD(proportional-differential)数据重构补偿策略,提升了ICPS对DoS攻击的主动防御能力,而安全系数的引入又使主被动容侵得以交融协同;接着,在同一非均匀数据传输机制下,通过给出的观测器与综合安全控制器的设计方法,实现了对不同能量等级DoS攻击的主被动混合容侵、执行器故障主动容错,并与通信协同设计的目标;最后,通过四容水箱系统仿真验证了所得理论结果的有效性。展开更多
文摘为了消除调速器死区非线性对系统的影响和保证系统稳定,针对存在调速器死区的负荷频率控制(load frequency control,LFC)系统,采用了自抗扰控制(active disturbance rejection control,ADRC)方法,并通过描述函数法验证控制方法的有效性。提出死区线性化方法,并采用了广义自抗扰控制(generalized active disturbance rejection control,GADRC)方法。为能有效地消除死区非线性,提出了一种误差补偿策略。仿真结果显示,提出的误差补偿策略能有效地消除死区非线性,保证了系统的控制性能。提出通过描述函数法获得补偿系数的取值范围也是可行。
文摘Wind energy （WE） has become immensely popular for distributed generation （DG）. This case presents the monitoring, modeling, control, and analysis of the two-level three-phase WE based DG system where the electric grid interfacing custom power device （CPD） is controlled to perform the smart exchanging of electric power as per the Indian grid code. WE is connected to DC link of CPD for the grid integration purpose. The CPD based distributed static compensator, i.e. the distributed static synchronous compensator （DSTATCOM）, is utilized for injecting the wind power to the point of common coupling （PCC） and also acts against the reactive power demand. The novel indirect current control scheme of DSTATCOM regulates the power import and export between the WE and the electric grid system. It also acts as a compensator and performs both the key features simultaneously. Hence, the penetration of additional generated WE power to the grid is increased by 20% to 25%. The burden of reactive power compensation from grid is reduced by DSTATCOM. The modeling and simulation are done in MATLAB. The results are validated and verified.
文摘针对一类有限能量拒绝服务(denial of service,DoS)攻击与执行器故障共存的工业信息物理系统(industry cyber-physical system,ICPS),研究了综合安全控制与通信协同设计问题。首先,考虑单侧网络遭受DoS攻击的情形,构建了ICPS综合安全控制架构,并从防御者的视角通过分析不同能量级DoS攻击对系统的影响差异,制定了相应的能量分级标准;其次,设计了DoS攻击的能量分级检测机制,并对小能量攻击以弹性控制鲁棒应对,对大能量攻击提出了一种PD(proportional-differential)数据重构补偿策略,提升了ICPS对DoS攻击的主动防御能力,而安全系数的引入又使主被动容侵得以交融协同;接着,在同一非均匀数据传输机制下,通过给出的观测器与综合安全控制器的设计方法,实现了对不同能量等级DoS攻击的主被动混合容侵、执行器故障主动容错,并与通信协同设计的目标;最后,通过四容水箱系统仿真验证了所得理论结果的有效性。
