Analyzing the Impact of Wind Generation on System Frequency

Abstract

With the increase of coordination between wind energy on the conventional power system, the effect of high penetration of injected wind power on power system stability turns into an important issue. The huge contrast is that the wind energy source is inherently uncontrollable. Such uncontrolled real power output variations can affect the grid, including frequency variations. Frequency control is an important issue with high state of penetration of wind, in weak system. As it has been seen that yield is variable in wind control generation yield, it will differ from time to time so as the frequency of the operation will get fluctuate, and frequency variation or deviation is to be alleviated to have a smooth power flow yield with less variations. To have that steady flow of power or to match with the grid frequency it is required to utilize GSC (grid side convertor) and RSC (rotor side converter) which will act as the slip control recuperation system and henceforth the power from the slip will be recovered and utilized. For the purpose of evaluating impact of large wind power penetration on system frequency Kundur's Two area system has been taken into consideration for the said aim, one of the conventional generators of area-1 has been replaced with group of wind generators. All the wind induction generator is of DFIG types. By changing penetration of wind power in the grid system frequency, ROCOF (Rate of change of frequency) and frequency nadir are the parameters of interest for the analysis. In order to improvise the system frequency, AGC has been considered. Under the influence of AGC wind generator can handle or cater more load sharing as compared to the situation when AGC was not present. The work further includes determination of critical penetration of wind power without loosing stability of the system. For incoming transients response and extending grid connection capability under 3-phase fault on transmission line in a weak power system is analyzed. At the time of fault, resistance in series with connecting bus of wind power penetration using a bypass breaker is considered based on this the system frequency and frequency nadir can be analyzed.