Abstract
The N-1 criterion is universally taken as the security constrains in the security-constrained unit commitment (SCUC) problem. The line outage distribution factors (LODF) is widely used in the N-1 continency for its state independence and computational efficiency. However, the LODF based model fails to consider reactive power and voltage magnitude. This paper closes this gap by deriving modified line outage distribution factors (MLODF) based on a linear power flow model. The proposed model, though state-independent, provides high-quality approximation of voltage magnitudes. Then, we apply this model to formulate the SCUC problem and propose an iterative solution process based on MLODF post-contingency filter to set up the contingency constraints. The simulation results of the benchmark test systems verify the accuracy of proposed MLODF. The six-bus and IEEE 118-bus systems show that the MLODF based model can provide a more accurate and secure generation schedule comparing with the traditional LODF based model while ensuring the AC feasibility for most N-1 continency.
Highlights
Security-constrained unit commitment (SCUC) refers to the economic dispatching of generating units for supplying the system load and satisfying the transmission network security at the normal state [1], which has been widely applied in both vertically integrated utilities and restructured power systems
This paper proposes the modified line outage distribution factors (MLODF), which is derived from a state-independent linear power flow model and only related to the network parameters
In this paper, we propose the MLODF derived from a stateindependent linear power flow model and apply this model to formulate the security-constrained unit commitment (SCUC) problem
Summary
Security-constrained unit commitment (SCUC) refers to the economic dispatching of generating units for supplying the system load and satisfying the transmission network security at the normal state [1], which has been widely applied in both vertically integrated utilities and restructured power systems. The piece-wise linearization technique method with integer variables is applied to handle the nonconvexity introduced by the quadratic losses These models provide high-quality approximation of AC power model while maintaining the computation efficiency, having been applied to the optimal power flows [13]-[14], transmission expansion planning [15]. Though LODF can straightly determine the post-contingency active power flow, it cannot predict post-outage reactive power flows and voltage To solve this problem, many researchers proposed the methods based on the sensitivity coefficients to calculate the post-contingency states [23]-[24]. This paper proposes the modified line outage distribution factors (MLODF), which is derived from a state-independent linear power flow model and only related to the network parameters. A formulation for SCUC problems based on MLODF for post-contingency states is established and a linearization method is applied to approximate the quadratic branch flow limits.
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