Comparing and Evaluating Frequency Response characteristics of

Abstract: This thesis investigates the suitability to use wind power installations, equipped with variablespeed wind turbines with power electronic interfaces, for power system frequency control bystudying the active power output response to a change in network frequency. The result islater compared to the frequency response of conventional generators (hydro, gas turbine andthermal power plant) that are mainly used for primary and secondary frequency control. Inthis thesis a market available multi-MW variable speed wind turbine is investigated. It isfound that wind energy can be used as an excellent source for compensating frequencydeviation.Characteristic curves (Turbine Valve/Gate, Mechanical Power & Speed deviation,) of Hydro,Steam, and Thermal power model are varied considerably with specified load. The relationbetween Gate/valve (water/steam input) and Mechanical power (output) of the dynamic modelis very significant because it adjusts the operation of Governor Action. Here in Hydro, Steam,and Thermal power model, we focus on to find out the response between input (gate/valve)and out put (Speed deviation & Mechanical power) with varying step load (5 to 10 percent).We compared the wind power characteristics (Electrical power) with characteristics ofConventional power (Hydro, Thermal & Steam) plant by increasing the load of the powersystem which will in return increase the demand of the system and create correspondingvariation in the system frequency; According to primary frequency control (Local automaticcontrol which delivers reserve power in opposition to any frequency change), theconventional power plant takes time (the Rise time and Settling time in case of Mechanicalpower is 04-25 sec and 20-68 sec respectively to stabilize the system against 5% loaddisturbance) to meet the increased power demand thereby balancing the system frequency.In this thesis, we suggest to use the wind energy to meet the raised power and to stabilize thesystem frequency, during this transition time; Here wind energy is run in de-rated power (5-10% lower from its rated power). When the demand is increased, conventional power planttakes time to meet the demand and consequently frequency of the system fluctuate causingimbalance; at that time we increase the Electrical power output of wind Energy from deratedto its rated value to meet the demand and to stabilize the frequency of the system. For whichwe found the Rise time and settling time of the wind turbine to be 03 sec – 09 sec and 08 sec–38 sec respectively.So, Wind energy can be used as a limited ancillary resource to meet the load demand as wellas active power control in power systems.