Abstract
In this paper we describe the methodology of determining the reliability indices for power generating subsystem. We analyse then influence of the considered wind power plant reliability modelling on system reliability. The proposed reliability model of wind power plant is two-state model as compromise between calculation time and accuracy. We have found an empirical relationship between the power system reliability index LOLE (Loss of Load Expectation) and reserve capacity margin for a given wind share. This allowed us to estimate the required minimal reserve capacity margin for a given level of power system security and for a known structure of system installed capacity.
Highlights
The growing share of renewable energy in the Polish Electric Power System is a new challenge for the previously used measures of power system reliability, the methods of their determination and reliability models
Generation reliability assessment is used to evaluate short-term and long-term risks in generation capacity planning [1,2,3]. In this context, when variable renewable energy sources (VRES) such as wind generation are integrated into power grids, it is important to investigate their effect on the system reliability [4]
For a given generating capacity structure of the power system LOLE is exponentially dependent on the reserve capacity margin
Summary
The growing share of renewable energy in the Polish Electric Power System is a new challenge for the previously used measures of power system reliability, the methods of their determination and reliability models. A simple method of risk assessment for generation subsystem (being a part of power system), which is based on the margin of generating capacity (reserve capacity margin – RCM), is no longer sufficient This is the reason why this paper presents an attempt to estimate the influence of the existing and newly build wind turbines’ capacity on evaluation of power system reliability. Calculation of COPT or CDF of generating available capacity is based on the accepted reliability models of generating units. They may be two-state or multi-state models [2,3,4, 7,8,9,10]: A. Different techniques have been used to model wind generation and integrate them to evaluate the reliability of wind-integrated power systems [7,8,9,10]
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