Study On Large Disturbance Voltage Stability Calculation Analysis Of Guang'an Power Network

With the scale expansion of power network, the problem of voltage stability become more and more prominent, more and more attention on the research of voltage stability are paid to. Voltage is an important parameter for the safe and stable operation of power system, and it is an index to indicate the power quality .The development of power system ,the enlarge of power system ,the extending of the transmission distance , have made the dispersion of network voltage in space become more serious; the load fluctuating of modern power system is very acute, and it make the dispersion of network voltage in time become more serious. Considering the change of load characteristic and the widely use of on-load voltage regulator, the reactive power characteristic go to the bad, the reactive power voltage regulate coefficient of load decrease too.The voltage stability of power system is one of the important aspects of stability research of power system, Especially recently, the incidents caused by voltage stability destroy increased, and the harm quite enormous, which rise the cognition on the problem of voltage stability to a new height.Guang'an power network has only one 220kV Daishi substation presently, this substation is the main electrical source of Guang'an power network, because of the singleness of the electrical source, the stability of this region is lowliness, and the power quality can't guarantee. But the reactive power compensation equipment is parallel capacitor, the bad reactive power-voltage characteristic of capacitor is difficult to stop the voltage breakdown which is result from the fast voltage decrease. With the rapid increase of loads, the dangerous of large disturbances voltage stability destory is potential.Combined with the facts of Guang'an power network, this paper deeply analysis and calculate the large disturbances voltage stability of Guang'an power network, and bring out corresponding countermeasure based on it to make sure safe,reliable operation of the network, which become the relevant reference of power network programming.The following tasks are analyzed and researched:â‘ The reactive voltage characteristic of generator, reactive compensation equipment and the load of power system, as well as the principle of the voltage stability of power system, were analyzed;â‘¡The situation of 2010 year of Guang'an power network was analyzed, based on which the mathematics model used to analyse the large disturbance of Guang'an power network was established;â‘¢Through set different disturbances, adopt numeric simulation calculate, the large disturbances voltage stability of Guang'an power network is analyzed;â‘£According to the simulation result, the measure to improve the voltage stability of Guang'an power network is proposed.