Abstract
To assess the blackout risk of power system with high penetration of renewable, the existing cascading failure models need to be improved for capturing the dynamics and relays of renewable generation. In this paper, a dynamic model of cascading failure considering the utility-scale and distributed renewable energy is proposed. With the solution of dynamic equations for power system, the logics of relays are simulated for components such as transmission lines, conventional generators and renewable generations. The failure interactions among sources, networks, and loads are analyzed more comprehensively. In the proposed model, to capture the impact of renewable energy on the system dynamics, the dynamic equations for the utility-scale renewables are constructed with the second generic generation model of WECC (Western Electricity Coordinating Council), and the interactions among distributed renewables and the transmission system are considered in the amount of net load at buses. And to capture the tolerance of renewables for disturbances, the simulation logic is constructed for the voltage relays and frequency relays of utility-scale renewables and the anti-islanding relay of distributed renewables. The presented model is verified on the IEEE 39-bus system. The results show that renewable energy has a significant influence on the cascading failure risk.
Highlights
Recent blackouts in South Australia [1] and the United Kingdom [2] indicate that the tripping of the utility-scale and distributed renewable energy may be induced by the voltage disturbances and frequency disturbances in transmission system
A dynamic model for power system with renewables is proposed in this paper by combining the electromechanical transient model of synchronous generators and the second-generation generic dynamic model by renewable energy of Western Electricity Coordinating Council (WECC)
This paper considers the impact of utility-scale and distributed renewable energy on the dynamics of the power system, and proposes a dynamic model of cascading failures for the power system with renewable energy
Summary
Recent blackouts in South Australia [1] and the United Kingdom [2] indicate that the tripping of the utility-scale and distributed renewable energy may be induced by the voltage disturbances and frequency disturbances in transmission system. The transmission line overloading risk in cascading failure is assessed using the stochastic power flow to model the fluctuations of renewable energy in Ref [3]. In order to capture the dynamics in blackouts, Ref [4] establishes a dynamic simulation model for the traditional power system This model does not consider the impact of renewable energy. It is difficult to deal with the complicated situation having multiple successive actions of controls and relays in the propagation of cascading failures To this end, a dynamic model for power system with renewables is proposed in this paper by combining the electromechanical transient model of synchronous generators and the second-generation generic dynamic model by renewable energy of Western Electricity Coordinating Council (WECC). Shedding, etc., the relays are considered for the utility-scale and distributed renewable energy sources
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