Abstract
Risk in a power system’s ability to survive imminent disturbances without recourse to low operational cost and non-interruptive energy delivery remains the responsibility of every grid operator. Intermittencies in renewable energy and dynamic load variations influence the quality of power supply. The sudden changes affect the system frequency, compromising the reliability of the system grid; generation response to frequency regulation is momentous in such an incident. Slower response or smaller reserve capacity may cause a power shortage. This paper proposes a novel predictive scheme for a short-term operational reliability evaluation for system operations planning. The proposed method evaluates the operational reliability of system frequency whiles considering high renewable power penetration and energy storage system incorporation. Required energy generations, and other grid parameters, are modelled as stochastic inputs to the framework. We formulate a reliability index as a frequency distribution considering system frequency control dynamics and processes. The IEEE Reliability Test System (RTS) is used to prove the efficacy of the proposed model.
Highlights
IntroductionPower system security defines the probability of the system’s operating point remaining within acceptable criteria, given the likelihood of changes in contingencies and the operational environments
Power system security defines the probability of the system’s operating point remaining within acceptable criteria, given the likelihood of changes in contingencies and the operational environments.The uncertainties in demand load and generation supply concern both operational reliability and the stability of the system
To assess the short-term reliability of the grid, this paper proposes a predictive frequency-based reliability index to evaluate the short-term operational reliability of the power system with considerations of the set criteria, dynamic system response, and system frequency regulation processes
Summary
Power system security defines the probability of the system’s operating point remaining within acceptable criteria, given the likelihood of changes in contingencies and the operational environments. The uncertainties in demand load and generation supply concern both operational reliability and the stability of the system. Both system frequency and voltage provide the base for reliable assessments of the system grid. Adhering to frequency and voltage regulations is essential for the operational security of the network in an unforeseen contingency. Frequency indicates the system’s active power adequacy in system operation. Real-time operation of a power system with high renewable penetration, variable demand loads and renewable power, and frequent generator failures could cause considerable variations in system frequency. Reliability standards such as control performance standards (CPS) [4] and European Network of Transmission System
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