Hardware-in-the-loop Simulation System For Large-scale Wind-Gas Coordinating Equivalent Power Plant

From the perspective of sustainable development strategy,vigorously developing and using of green energy has become a new trend.Wind power has the characteristics of renewable,zero carbon emissions,rich in resources,has been rapid developed worldwide.However,the increasing penetration of wind power bring a serious challenge to the safe and stable operation of power grid due to the randomness and volatility of wind power.In this paper,the problem of large-scale wind-gas coordinated equivalent power plant automatic generation control(AGC)and large-scale thermostatically controlled loads(TCL)participating in real-time dispatching are studied.In this paper,the gas-steam combined cycle power plant(CCPP)is studied.With the characteristics of high efficiency,no pollution and rapid regulation ability,CCPP unit can operate with wind power complementary.The principle of CCPP unit is briefly introduced and based on the dynamic response,CCPP unit is modeled.The CCPP unit model is encapsulated by RTDS/CBuilder,which can be reused.Finally,CCPP unit is verified with the field test results.In this paper,AGC of coordinated power plant is studied.This paper briefly introduces large-scale wind-gas coordinated equivalent power plant,and proposes AGC control strategy which includes three time-scales: day-ahead scheduling,real-time dispatching and AGC control.The active power tracking interface is used to track the actual wind farm output,which making the controlled source has the same external characteristics with wind farm.The hardware-in-the-loop(HIL)simulation system of AGC for equivalent power plant is proposed.The case results show that the HIL simulation system can meet the requirement of the system scale,real-time simulation and AGC algorithm of the equivalent power plant.Through wind-gas coordinated generation,source-grid horizontal interaction is achieved,and smoothing wind power,wind power scheduling is implemented.With the access of large-scale wind power,the tracking load ability of power is declining.In order to maintain the stability of the system,CCPP unit need to leave sufficient reserve capacity,which will reduce the economy.TCL can be considered as a kind of "virtual power generation resources",and with the longitudinal interaction of wind farms,CCPP and TCL,wind power can be sent out smoothly,meanwhile the economy of the system will be improvedIn this paper,a digital real-time co-simulation(DRTCoS)method of smart grid for integrating large-scale fast demand response resources is proposed.The network with a large number of demand-side resources is decoupled to backbone grid and multiple load subsystems.RTDS and GridLAB-D is used to realize the co-simulation system.Based on the study of the equivalent thermal parameters(ETP)model of the air conditioning load,a real-time active power dispatching strategy based on the TCL is proposed.Through longitudinal interaction between TCL and backbone grid of WGPP,real-time active power dispatching of TCL is realized under the precondition of guaranteeing users' satisfaction of electricity consumption.Finally,the real-time dispatching of TCL is evaluated from the point of load following and frequency regulation.The simulation results show that TCL participating in the active power dispatching have a positive effect on load following.The effect of frequency regulation can be improved by smoothing power of TCL using energy storage system.