Abstract
Power system scheduling mainly concerns economic optimization issues of the power system, which is also commonly known as the unit commitment (UC) problem. However, improper planning in the generation schedule may pose a negative impact on power system stability. Additionally, the trend of large-scale integration of renewable energy in the future power system brings critical challenges to power system stability. In consequence, it is necessary to integrate the stability constraints into power system scheduling. According to the classic classification of power system stability (i.e. voltage stability, frequency stability, and rotor angle stability), stability constraints can be constructed accordingly to guarantee system stability when solving UC problems, which ensures both the economic efficiency and technical feasibility of the UC solutions. This paper reviews typical stability constraints and how to apply these constraints in solving UC problems. Representative works are summarized to provide a guidance for addressing the stability constrained scheduling problems in the future power system operation.
Highlights
From the perspective of power system stability, the stability margin is deteriorated due to the integration of low-inertia power sources, which may possess a threat for the feasibility of existing power system scheduling methods, especially in the cases of high penetration of renewable energy
Power system scheduling consists of two levels of economic management on generation units: unit commitment (UC) level which gives the commitment solution of generating units at the optimal operating costs with satisfied technical constraints in supplying the demand of consumers; and the economic dispatch (ED) level figures out the exact power output of each unit with the aim of minimizing the total cost while fully supplying the power demand and complying with the transmission network constraints in every time horizon
If security constraints are taking into account, which ensures the power system with the predetermined scheduling plan to operate under a significant disturbance, it is defined as the security-constrained unit commitment (SCUC) [29]
Summary
Number of generation units t t=1,2,3,...Nt denotes the time horizons which normally divide a day into Nt hours g g=1,2,3,...Ng represents the generation units k CgV, CgF CgSU, CgSD. Small signal stability margin threshold Transient stability margin threshold maximum limit of rate of change of frequency (RoCoF) Dead band of the governors f0. J.Luo et al.: Stability-constrained Power System Scheduling: A Review vg vg is the maximum ramp rate of governor at unit g. B. VARIABLES ugt Binary variable for on/off status of unit g in time horizon t ygt, zgt Binary variables for start-up / shut-down status of unit g at the beginning of time horizon t. Post fault stable equilibrium point of each line φu Unstable equilibrium point of each line
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