Static Voltage Stability Assessment of the Kenyan Power Network

Table 2

Summary of popular dynamic voltage stability analysis methods.

Method	Features	Advantages	Limitations
Small signal stability analysis	Involves analysing eigenvalues of the linearized differential-algebraic equations that describe the dynamic model of a system.	It provides information about the inherent dynamic characteristics of a system.	Difficulty in establishing the main components of a system and modelling an accurate load model.
Time domain simulation	Involves solving the nonlinear differential-algebraic equations, continuous-discrete time equations that describe the dynamic model of a system.	It is suitable for any power system dynamic model and can be employed to evaluate the effectiveness of other voltage stability assessment methods.	Difficulties arising from processing time frame and load modelling. Different load models yield different conclusions.; A significant computational effort is required.
Energy function method	Employs Lyapunov direct method to assess the stability of the system.	Provides a quantitative measure of voltage stability by showing the distance between the current operating point and the point of voltage collapse.	Difficulty in constructing a proper energy function due to the many factors that affect the voltage stability problem.