Abstract
High distributed generation (DG) penetration makes the traditional method of equalizing the distribution power system (DPS) to the PQ load bus in the risk assessment of the transmission power system (TPS) no longer applicable. This paper proposes a risk assessment method for an integrated transmission–distribution system that considers the reactive power regulation capability of the DGs. Based on the DG’s characteristics and network constraints, the regulation capacity is mapped to the boundary buses of the distribution networks. Coordinating the relationship between reactive power and active power, the utilization of the regulation capacity is maximized to reduce the load shedding in the fault analysis of the TPS. Simulation results in the integrated transmission–distribution system illustrate that the effective use of the regulation capacity of the DPS can reduce the risk of the TPS. The method can be applied to the reactive power sources planning and dispatching of power system.
Highlights
With the integration of a large number of distributed generation (DG), the distribution network has changed from the traditional passive network to the active network with bi-directional power flow [1,2]
This paper proposes a risk assessment method for integrated an transmission–distribution system system that considers the reactive power regulation capability of the DGs
Are the linear relationship coefficients of ∆P and ∆Q when distribution power system (DPS) provides inductive reactive power and capacitive reactive power, respectively; QD and PD are the value of the inductive reactive power and active power obtained by the DPS from the transmission power system (TPS), respectively; and QD0, PD0 are the value of initial state, respectively
Summary
With the integration of a large number of DGs, the distribution network has changed from the traditional passive network to the active network with bi-directional power flow [1,2]. When analyzing the risk of the TPS, the reactive power regulation capability needs to be fully considered in the equivalent model of distribution network with DGs. due to the limited considered in the equivalent model of distribution network with DGs. due to the limited capacity of DG’s inverter, the active power state of DGs needs to be considered when utilizing DGs’. The reactive power regulation capability of the DPS is of the DPS is considered when assessing the operational risk of the transmission network.
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