DC Bus Implemented Damping Control – Part II: Battery Energy Storage Systems

W DU and H F WANG Southeast University, Nanjing, China Abstract – Damping torque analysis is a technique developed based on classical control theory for the excitation implemented damping control in power generation, which has been widely used in engineering practice since it was proposed. This paper proposes the damping torque analysis for DC bus implemented damping control in power transmission networks and presents two practical examples. The first example is the investigation of damping effect of shunt VSC (Voltage Source Converter) based FACTS voltage control, i.e., STATCOM (Static Synchronous Compensator) voltage control. It is shown in the paper that STATCOM voltage control only contributes synchronous torque and hence imposes no effect on the damping of power system oscillations. The second example is the damping control implemented by battery Energy Storage Systems (ESS). It is established in the paper that both the interaction between battery ESS damping and voltage control and the robustness of battery ESS damping control to the variations of power flow conditions is different when it is implemented via active and reactive power regulation respectively. In the paper, all conclusions obtained are demonstrated by simulation results of example power systems installed with a STATCOM and a battery ESS separately. The paper is presented in two parts. This is the second part of the paper.