Abstract
With the extensive application of power electronics interfaced nonsynchronous energy sources (NESs) in modern power systems, the system stability especially the transient stability is prominently deteriorated, and it is crucial to find a comprehensive and reasonably simple solution. This paper proposes a direct method-based transient stability analysis (DMTSA) method which concludes the key steps as follows: (1) the system modeling of Lyapunov functions using mixed potential function theory and (2) the stability evaluation of critical energy estimation. A voltage source converter- (VSC-) based HVDC transmission system is simulated in a weak power grid to validate the proposed DMTSA method under various disturbances. The simulation results verify that the proposed method can effectively estimate the transient stability with significant simplicity and generality, which is practically useful to secure the operation and control for power electronics-dominated power systems.
Highlights
At present, nonsynchronous energy sources (NESs) such as renewable power generation, flexible AC transmission systems, HVDC transmission systems, energy storage devices, and DC microgrids are increasingly widely employed in power systems [1,2,3,4,5]
Strong nonlinearity and dynamic characteristics exist in power electronic converters, and modulation and limiting phenomena occur when using pulse width modulation (PWM) which has saturation nonlinearity. ese characteristics will seriously affect the stability of the power electronics-dominated power system
High-voltage direct current transmission system constructed by voltage source converter (VSC-HVDC) is a new type of DC transmission technology developed on the basis of full controlled power devices such as voltage source converter (VSC) technology, GTO, and IGBT. e VSCHVDC system contains a large number of power electronics conversion devices, which can realize specific functions in the links of transmission, distribution, transformation, and utilization, and is a typical power electronics-dominated power system
Summary
NESs such as renewable power generation, flexible AC transmission systems, HVDC transmission systems, energy storage devices, and DC microgrids are increasingly widely employed in power systems [1,2,3,4,5]. In the aspect of transient stability analysis of power electronics-dominated power systems (PEDPS), three methods are mainly used—time domain simulation method [14,15,16], artificial intelligence method [17,18,19], and direct method [20,21,22]. Erefore, for a power electronics-dominated power system, the Lyapunov direct method is used to analyze its transient stability as well as to calculate the stability criterion and verify the simulation results in time domain. A Lyapunov function of the system is established by applying the mixed potential function theory; secondly, a detailed analysis procedure is presented; the transient stability of a power system model incorporating a VSC-HVDC system is analyzed to verify the feasibility of this method. A Lyapunov function of the system is established by applying the mixed potential function theory; secondly, a detailed analysis procedure is presented; the transient stability of a power system model incorporating a VSC-HVDC system is analyzed to verify the feasibility of this method. e method is proved to be a simplified analytical and a practical criterion for specific engineering design
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