Current sensorless control of a voltage-source active power filter

The performance of a conventional shunt active filter is heavily dependent on the accurate current sensing and complicated control algorithm. This paper presents a voltage source active power filter control method that does not require any current sensors. The proposed control system is moreover very simple because it compensates the load current harmonics by operating as a sinusoidal voltage source. This paper presents the operating principles and space-vector control of the system. The system performance and power losses are studied with laboratory measurements and the results are compared to a conventional shunt active filter. The test results show effective, high efficiency current harmonic compensating performance.