Power quality definitions
The power quality (PQ) can take into the different behavior of the electrical signals in power systems, which supply to the loads economically with uninterrupted power supply services, and various influences arise to change the waveform characteristics in electrical signals. PQ was not considered as an important issue in the field of electrical engineering until the entry of electronic equipment. This electronic equipment is more sensitive than electrical equipment. In a human body, if there is any problem in the blood or blood circulation, it will collapse the entire organ system. Likewise, if there are any defects in the PQ, it collapses the entire high sensitive equipment. In a power system, all the equipment are connected linearly. If a problem occurs at one end, it can be felt at the other end of the power system. If a short circuit occurs, it results in the opening of the circuit breaker to run the generator on no-load condition, and after fault clearance, the generator is shifted to on load, which gives a serious impact on all the equipment connected to the power system.