针对分布式电源接入引起的功率波动与潮流不均衡问题,旋转潮流控制器(rotary power flow controller,RPFC)通过伺服电机调节旋转角的大小,输出幅值与相位连续可调的串联电压,实现有源配电网的功率调控,具有控制方式灵活、调节精度高和...针对分布式电源接入引起的功率波动与潮流不均衡问题,旋转潮流控制器(rotary power flow controller,RPFC)通过伺服电机调节旋转角的大小,输出幅值与相位连续可调的串联电压,实现有源配电网的功率调控,具有控制方式灵活、调节精度高和可靠性强等优点。该文首先根据RPFC的工作原理建立其数学模型。其次,提出RPFC功率解耦控制方法,即根据线路有功与无功功率的目标值分别计算出RPFC输出电压的dq轴分量设定值,实现输出电压对线路功率的闭环解耦控制。接着,针对RPFC接入后存在输出功率周期性震荡的问题,采用旋转角转速自适应的调节方式,即将输出电压dq轴分量合成并转换为两个旋转角的参考值,并根据旋转角偏差,对RPFC伺服电机的占空比进行量化计算,从而对两个旋转角的转速进行协调控制。最后,通过仿真验证该控制方法的正确性,并研制一台40kVA的RPFC装置样机,通过在单回与并行线路场景下的实验验证RPFC在不同工况下功率精确控制和潮流均衡调控的可行性与有效性。展开更多
旋转潮流控制器(rotary power flow controller,RPFC)应用到电力系统潮流控制中,具有控制方法简单、输出无谐波、可靠性高、成本低的优点,但目前对其模型和控制特性的研究还并不充分。为此,分析并建立了RPFC的稳态数学模型,对RPFC的稳...旋转潮流控制器(rotary power flow controller,RPFC)应用到电力系统潮流控制中,具有控制方法简单、输出无谐波、可靠性高、成本低的优点,但目前对其模型和控制特性的研究还并不充分。为此,分析并建立了RPFC的稳态数学模型,对RPFC的稳态特性进行了研究,推出了RPFC注入线路电压与转子角之间的关系,分析了RPFC的潮流控制特性。RPFC注入线路的电压受转子角度的控制,当接入RPFC后,线路电压的大小和相位对转子角度的灵敏范围不同,因此对线路有功和无功调节有不同的灵敏区域,RPFC可以在一定的圆形区域内实现对线路潮流的控制,其控制范围由RPFC能注入线路电压的最大变比决定。基于PSCAD/EMTDC的仿真结果,验证了对RPFC稳态模型和稳态特性分析的正确性以及RPFC对线路潮流控制的有效性和灵活性。展开更多
Process data compression and trending are essential for improving control system performances. Swing Door Trending (SDT) algorithm is well designed to adapt the process trend while retaining the merit of simplicity. B...Process data compression and trending are essential for improving control system performances. Swing Door Trending (SDT) algorithm is well designed to adapt the process trend while retaining the merit of simplicity. But it cannot handle outliers and adapt to the fluctuations of actual data. An Improved SDT (ISDT) algorithm is proposed in this paper. The effectiveness and applicability of the ISDT algorithm are demonstrated by computations on both synthetic and real process data. By applying an adaptive recording limit as well as outliers-detecting rules, a higher compression ratio is achieved and outliers are identified and eliminated. The fidelity of the algorithm is also improved. It can be used both in online and batch mode, and integrated into existing software packages without change.展开更多
文摘针对分布式电源接入引起的功率波动与潮流不均衡问题,旋转潮流控制器(rotary power flow controller,RPFC)通过伺服电机调节旋转角的大小,输出幅值与相位连续可调的串联电压,实现有源配电网的功率调控,具有控制方式灵活、调节精度高和可靠性强等优点。该文首先根据RPFC的工作原理建立其数学模型。其次,提出RPFC功率解耦控制方法,即根据线路有功与无功功率的目标值分别计算出RPFC输出电压的dq轴分量设定值,实现输出电压对线路功率的闭环解耦控制。接着,针对RPFC接入后存在输出功率周期性震荡的问题,采用旋转角转速自适应的调节方式,即将输出电压dq轴分量合成并转换为两个旋转角的参考值,并根据旋转角偏差,对RPFC伺服电机的占空比进行量化计算,从而对两个旋转角的转速进行协调控制。最后,通过仿真验证该控制方法的正确性,并研制一台40kVA的RPFC装置样机,通过在单回与并行线路场景下的实验验证RPFC在不同工况下功率精确控制和潮流均衡调控的可行性与有效性。
文摘旋转潮流控制器(rotary power flow controller,RPFC)应用到电力系统潮流控制中,具有控制方法简单、输出无谐波、可靠性高、成本低的优点,但目前对其模型和控制特性的研究还并不充分。为此,分析并建立了RPFC的稳态数学模型,对RPFC的稳态特性进行了研究,推出了RPFC注入线路电压与转子角之间的关系,分析了RPFC的潮流控制特性。RPFC注入线路的电压受转子角度的控制,当接入RPFC后,线路电压的大小和相位对转子角度的灵敏范围不同,因此对线路有功和无功调节有不同的灵敏区域,RPFC可以在一定的圆形区域内实现对线路潮流的控制,其控制范围由RPFC能注入线路电压的最大变比决定。基于PSCAD/EMTDC的仿真结果,验证了对RPFC稳态模型和稳态特性分析的正确性以及RPFC对线路潮流控制的有效性和灵活性。
基金The authors would like to acknowledge the support from Project“973”of the State Key Fundamental Research under grant G1998030415.
文摘Process data compression and trending are essential for improving control system performances. Swing Door Trending (SDT) algorithm is well designed to adapt the process trend while retaining the merit of simplicity. But it cannot handle outliers and adapt to the fluctuations of actual data. An Improved SDT (ISDT) algorithm is proposed in this paper. The effectiveness and applicability of the ISDT algorithm are demonstrated by computations on both synthetic and real process data. By applying an adaptive recording limit as well as outliers-detecting rules, a higher compression ratio is achieved and outliers are identified and eliminated. The fidelity of the algorithm is also improved. It can be used both in online and batch mode, and integrated into existing software packages without change.