The optical storage microgrid system composed of power electronic converters is a small inertia system.Load switching and power supply intermittent will affect the stability of the direct current(DC)bus voltage.Aiming...The optical storage microgrid system composed of power electronic converters is a small inertia system.Load switching and power supply intermittent will affect the stability of the direct current(DC)bus voltage.Aiming at this problem,a virtual inertia optimal control strategy applied to optical storage microgrid is proposed.Firstly,a small signal model of the system is established to theoretically analyze the influence of virtual inertia and damping coefficient on DC bus voltage and to obtain the constraint range of virtual inertia and damping coefficient;Secondly,aiming at the defect that the Sailfish optimization algorithm is easy to premature maturity,a Sailfish optimization algorithm based on the leak-proof net and the cross-mutation propagation mechanism is proposed;Finally,the virtual inertia and damping coefficient of the system are optimized by the improved Sailfish algorithm to obtain the best control parameters.The simulation results in Matlab/Simulink show that the virtual inertia control optimized by the improved Sailfish algorithm improves the system inertia as well as the dynamic response and robustness of the DC bus voltage.展开更多
串联补偿装置会引发汽轮机组的次同步谐振(subsynchronous resonance,SSR)。提出了一种改进粒子群算法,并基于该算法利用静止无功补偿器(static var compensators,SVC)抑制SSR的原理,选取适当的测试量,设计了次同步阻尼控制器。将SVC的...串联补偿装置会引发汽轮机组的次同步谐振(subsynchronous resonance,SSR)。提出了一种改进粒子群算法,并基于该算法利用静止无功补偿器(static var compensators,SVC)抑制SSR的原理,选取适当的测试量,设计了次同步阻尼控制器。将SVC的控制器参数视为自适应参数,通过改进粒子群算法,以阻尼比为目标函数,计算出不同运行情况下的控制器参数,达到抑制SSR的目的。以南方电网墨红串补、砚崇串补子系统的仿真模型为例,验证了该阻尼控制器的有效性。展开更多
以高压直流输电系统快速可控为出发点,采用极大极小值原理和改进粒子群优化算法相结合的新方法,针对向家坝—上海±800 k V特高压直流输电系统送端可能发生的次同步振荡(sub-synchronous oscillation,SSO)问题,建立一种基于比例积...以高压直流输电系统快速可控为出发点,采用极大极小值原理和改进粒子群优化算法相结合的新方法,针对向家坝—上海±800 k V特高压直流输电系统送端可能发生的次同步振荡(sub-synchronous oscillation,SSO)问题,建立一种基于比例积分微分控制的UHVDC附加次同步振荡阻尼控制器(subsynchronous oscillation damping controller,SSDC)模型。对不同方式的时域仿真结果表明,该SSDC控制器能够有效抑制交直流互联电网送端系统汽轮机组的轴系扭振,可在相当大范围内保证系统的SSO稳定性,具有较强的鲁棒性。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
基金the National Natural Science Foundation of China(52177184)。
文摘The optical storage microgrid system composed of power electronic converters is a small inertia system.Load switching and power supply intermittent will affect the stability of the direct current(DC)bus voltage.Aiming at this problem,a virtual inertia optimal control strategy applied to optical storage microgrid is proposed.Firstly,a small signal model of the system is established to theoretically analyze the influence of virtual inertia and damping coefficient on DC bus voltage and to obtain the constraint range of virtual inertia and damping coefficient;Secondly,aiming at the defect that the Sailfish optimization algorithm is easy to premature maturity,a Sailfish optimization algorithm based on the leak-proof net and the cross-mutation propagation mechanism is proposed;Finally,the virtual inertia and damping coefficient of the system are optimized by the improved Sailfish algorithm to obtain the best control parameters.The simulation results in Matlab/Simulink show that the virtual inertia control optimized by the improved Sailfish algorithm improves the system inertia as well as the dynamic response and robustness of the DC bus voltage.
文摘串联补偿装置会引发汽轮机组的次同步谐振(subsynchronous resonance,SSR)。提出了一种改进粒子群算法,并基于该算法利用静止无功补偿器(static var compensators,SVC)抑制SSR的原理,选取适当的测试量,设计了次同步阻尼控制器。将SVC的控制器参数视为自适应参数,通过改进粒子群算法,以阻尼比为目标函数,计算出不同运行情况下的控制器参数,达到抑制SSR的目的。以南方电网墨红串补、砚崇串补子系统的仿真模型为例,验证了该阻尼控制器的有效性。
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。
