The purpose of this paper is to show a laboratory scale implementation of a Thyristor Switched Capacitors （TSC） as an alternative for voltage regulation during a direct on line three-phase induction motor starting o...The purpose of this paper is to show a laboratory scale implementation of a Thyristor Switched Capacitors （TSC） as an alternative for voltage regulation during a direct on line three-phase induction motor starting on an emulated weak transmission line. Thyristor switched capacitor bank was chosen because it is a well known topology, considering the very nature of the direct starting induction motors, which represents a highly inductive load, the use of switched reactors becomes unnecessary. Such fact minimizes the introduction of harmonics components, and also reduces the cost of the implementation. The binary disposition of the banks allows a variable Var compensation with sixteen steps, in this case. The solution makes use of low cost devices combined with sliding window voltage and current measurement algorithm and a PI control with dead band control for achieve the shown experimental results, where the system is able to manage a typically 20% voltage drop, reducing it to less than 4%. The schematic of the developed circuit, the control technique and a quite simple method to calculate the binary weight capacitors banks are also presented.展开更多
为了补偿较大的无功功率,降低传统的有源电力滤波器(active power filter,APF)的容量,提出将有源电力滤波器与晶闸管投切电容器(thyristor switched capacitor,TSC)相结合构成混合滤波系统。该系统充分利用APF动态补偿性能好,TSC容量大...为了补偿较大的无功功率,降低传统的有源电力滤波器(active power filter,APF)的容量,提出将有源电力滤波器与晶闸管投切电容器(thyristor switched capacitor,TSC)相结合构成混合滤波系统。该系统充分利用APF动态补偿性能好,TSC容量大的特点,有效地消除电网中的谐波电流和提高功率因数。通过仿真研究,结果验证了系统的有效性和可行性,并且表明该系统具备较好的动态响应性能和稳定性。展开更多
文摘The purpose of this paper is to show a laboratory scale implementation of a Thyristor Switched Capacitors （TSC） as an alternative for voltage regulation during a direct on line three-phase induction motor starting on an emulated weak transmission line. Thyristor switched capacitor bank was chosen because it is a well known topology, considering the very nature of the direct starting induction motors, which represents a highly inductive load, the use of switched reactors becomes unnecessary. Such fact minimizes the introduction of harmonics components, and also reduces the cost of the implementation. The binary disposition of the banks allows a variable Var compensation with sixteen steps, in this case. The solution makes use of low cost devices combined with sliding window voltage and current measurement algorithm and a PI control with dead band control for achieve the shown experimental results, where the system is able to manage a typically 20% voltage drop, reducing it to less than 4%. The schematic of the developed circuit, the control technique and a quite simple method to calculate the binary weight capacitors banks are also presented.
文摘为了补偿较大的无功功率,降低传统的有源电力滤波器(active power filter,APF)的容量,提出将有源电力滤波器与晶闸管投切电容器(thyristor switched capacitor,TSC)相结合构成混合滤波系统。该系统充分利用APF动态补偿性能好,TSC容量大的特点,有效地消除电网中的谐波电流和提高功率因数。通过仿真研究,结果验证了系统的有效性和可行性,并且表明该系统具备较好的动态响应性能和稳定性。
