High penetration rates of renewable energy will bring stability problems for the future power grid.One of the critical issues is lack of inertia.In this paper,a synchronous motor-generator pair(MGP)system is proposed ...High penetration rates of renewable energy will bring stability problems for the future power grid.One of the critical issues is lack of inertia.In this paper,a synchronous motor-generator pair(MGP)system is proposed as a possible solution for renewable energy integration to enhance inertia and improve grid stability.First,feasibility studies of MGP on inertia,damping,efficiency,and cost are presented.Second,an analytical model is established based on its rotor angle relation.An active power control scheme based on voltage phase difference between renewable energy source and grid is then proposed,and state equations of MGP are derived for small signal stability.Next,two experiments are designed and implemented to verify stable operation and active power regulation of the MGP system.A single-machine infinite bus system is tested to investigate small signal stability and frequency response of MGP.The results show that the MGP system has a solid base in physics and is a feasible solution for providing enough inertia and improving small signal performance in the power grid with high penetration of renewable energy.The paper concludes with a discussion on future research directions to gain a better understanding of MGP.展开更多
Photovoltaic power(PV)is integrated into the grid through power inverters.But the inverters lead PV to lose some of the characteristics of conventional power sources that are conducive to grid stability,such as reduce...Photovoltaic power(PV)is integrated into the grid through power inverters.But the inverters lead PV to lose some of the characteristics of conventional power sources that are conducive to grid stability,such as reduced inertia,reactive power regulation capability,and fault ride-through capability.After introducing the power angle characteristics of a motor-generator pair(MGP)and reviewing MGP’s existing control methods and PV’s characteristics,this paper proposes a DC voltage feedback control method that can make MGP follow the fluctuations of a PV source.The proposal is studied experimentally,with the following results:(1)An MGP system can follow the power fluctuation of PV by using a DC voltage feedback control method.(2)Such feedback enables the PV to have a self-synchronization characteristic,which enables PV to actively contribute to the stability of the grid.展开更多
基金supported in part by the National Key Research and Development Program of China(2016YFB0101900).
文摘High penetration rates of renewable energy will bring stability problems for the future power grid.One of the critical issues is lack of inertia.In this paper,a synchronous motor-generator pair(MGP)system is proposed as a possible solution for renewable energy integration to enhance inertia and improve grid stability.First,feasibility studies of MGP on inertia,damping,efficiency,and cost are presented.Second,an analytical model is established based on its rotor angle relation.An active power control scheme based on voltage phase difference between renewable energy source and grid is then proposed,and state equations of MGP are derived for small signal stability.Next,two experiments are designed and implemented to verify stable operation and active power regulation of the MGP system.A single-machine infinite bus system is tested to investigate small signal stability and frequency response of MGP.The results show that the MGP system has a solid base in physics and is a feasible solution for providing enough inertia and improving small signal performance in the power grid with high penetration of renewable energy.The paper concludes with a discussion on future research directions to gain a better understanding of MGP.
基金supported in part by the Science and Technology Project of State Grid Corporation of China:Researches on the generation control system and operation strategies of the power grid with a super high proportion of new energy generations。
文摘Photovoltaic power(PV)is integrated into the grid through power inverters.But the inverters lead PV to lose some of the characteristics of conventional power sources that are conducive to grid stability,such as reduced inertia,reactive power regulation capability,and fault ride-through capability.After introducing the power angle characteristics of a motor-generator pair(MGP)and reviewing MGP’s existing control methods and PV’s characteristics,this paper proposes a DC voltage feedback control method that can make MGP follow the fluctuations of a PV source.The proposal is studied experimentally,with the following results:(1)An MGP system can follow the power fluctuation of PV by using a DC voltage feedback control method.(2)Such feedback enables the PV to have a self-synchronization characteristic,which enables PV to actively contribute to the stability of the grid.
