Unified power quality conditioner controller for enhancement of power system voltage stability using state vector modulation

With the development of power system the complexity is increased by many folds at present time. The 21^st century power users and consumers expectation on power quality is very high. At the same time consumers of nonlinear loads such as power converters etc also increasing. Therefore the online behavior of the power supply characteristics is changing with the unexpected users. The equipments which are present with the system were coming continuously under stress to overcome such unexpected fluctuations of power characteristics. Therefore a continuous monitoring and controlling process for improvement of these situations became a necessity. Thus the power researchers are continuously under pressure to develop new model of power conditioning equipments for on-line power monitoring. The power quality monitoring system incorporates some aspects of power qualities such as voltage sag, voltage swell, phase shift, flickers, harmonics, frequency etc. The power quality monitoring systems are so far designed and implemented in online may have improved individually the above compensations, but none has proved to be ideally covered in a single power equipment compensation system. This paper presents the design and development of UPQC system to monitor above compensations such as power quality surges, voltage sag, voltage swell, harmonics, frequency and reactive power of a power system. A simulation of the system in MATLAB and results on it are presented.