| In the process of regional power grid interconnection of China, low frequency oscillation occurs frequently, which is a big threat to the security and stability of power system. PSS currently used to suppress low-frequency oscillations of local oscillation mode, still can not effectively suppress the low-frequency oscillation modes between the regional power grid. As power system low frequency oscillation is featured by the active power oscillation, meanwhile, the energy storage device is capable to regulate the transmission power rapidly, this article discussed relative subjects of damping power system low frequency oscillation basing on energy storage technology. The main content of this paper are as follows.Firstly, this article introduces the physical meaning of the synchronous torque component and the damping torque component by analysis of electromagnetic torque of a single machine infinite system basing on the Hefrron-Philips model. The equivalent increment expression of energy storage device on the electromagnetic torque of generator is derived, which makes a proof that with appropriate control strategies the energy storage device can enhance the small signal stability of the system. And the effectiveness of two proportional control strategies, one basing on the power deviation and the other basing on the rotor angular velocity deviation are compared.Secondly, a linear optimal control strategy on the active power exchange of energy storage device with the system was implemented to a single machine infinite bus system with energy storage device. Beside this, POD control strategy was used on the energy storage device in the typical 4 generator 2 area system. The simulation result supports the improvement to system stability by energy storage device.Finally, the allocation strategy was discussed by simulations of a 36 bus system compromising the damping effect and the energy demands and small signal stability analysis on a single machine infinite bus system with energy storage device. |
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