Transient stability improvement: a review and comparison of conventional and renewable-based techniques for preventive and emergency control

Stability Improvement of a Transmission Grid With High Share of Renewable Energy Using TSCOPF and Inertia Emulation

“…Consequently, scenarios with high shares of non-synchronous renewable sources reduce the total inertia, which can make the system more unstable under critical contingencies. Thus, there is a growing number of studies that propose that non-synchronous power plants should emulate inertia to improve the dynamic stability [8], [92], [93]. To provide inertia to the system, one typical approach is that virtual inertia controllers modify the active power output proportionally to the derivative of the network frequency or Rate Or Change of Frequency (ROCOF) at the connection point [94], [95].…”

Wind Power Plants Influence on Out-Of-Step Operation Mode Parameters of the Power System

“…where H i and S i are the constant inertia and the rated apparent power of the i-th generator, n is the total number of synchronous generators connected to the grid, S EPS is the total power of the EPS, which is equal to the sum of the rated powers of the operating units. Meanwhile, it is known that this fact can lead to frequency and voltage fluctuations in normal operational modes, as well as a deeper decrease in the absolute frequency and voltage in the event of faults in the EPS [14], [15]. The world is trying to find a solution to this problem in different ways: the introduction of virtual inertia using control systems of WT (mainly of the 4th type); use of additional second-generation FACTS devices or powerful storage with WT, etc., which theoretically, makes it possible to provide additional active power if necessary.…”

Improvement of Transient Stability using TCSC

“…To perform the TS study, the following data is required [28]: i. Calculate the mechanical power (Pm) of generating units using the power flow study of pre transient network, and also find values of Ei∟δi0 for all generating units.…”