Transmission loss allocation through a modified Ybus

Abstract

A methodology to allocate the active power transmission loss among agents of a power pool is proposed. The approach is based on the inclusion of the admittances equivalent to bus power injections in the bus admittance matrix. For a given power-flow solution, the relationship between the branch currents and the load/generator current injections is determined using a modified bus admittance matrix, which allows the power loss of each transmission line to be expressed in terms of bus current injections. The proposed technique is simple to implement and flexible enough to allow the assignment of loss parcels to a preselected set of buses. An example, with a six-bus system illustrates the main steps of the proposed allocation strategy, and numerical results obtained with the IEEE 57-bus system are used to assess the quality of the loss allocation.

A Direct and Simplified Approach to Power-flow Tracing and Loss Allocation Using Graph Theory

“…Proportional sharing methods provide efficient procedures for loss allocation, but they allocate the losses only to the consumers or generators [9]. In network-dependent methods, modified admittance matrix [2,12] and the Z-bus [13] are used to allocate transmission loss.…”

“…However, any loss allocation technique should satisfy the following properties [2]: cross-subsidies must be avoided, if possible; otherwise they should be minimized; total loss must be consistent with the power-flow solution; loss allocation should depend on the relative location in the system; and most importantly, the allocation strategy must be simple to understand and easy to implement. This article proposes a power-flow tracing and loss allocation method based on the power-flow results.…”

Steady-State Assessment of the DG Impact on Voltage Control and Loss Allocation

“…This connection has a similar effect to partitioning the slack node losses among the other nodes and extends the application of the method to floating systems (Carpaneto et al, 2006b). (Daniel et al 2005). The original method described in the paper is formulated to be applied to transmission systems, in which loss allocation is carried out separately for generation nodes (sources) or load nodes (sinks), by decomposing the system currents.…”

Restructured Power System: Transmission Loss Allocation Between Generators and Loads Using Innovative Mathematical Approach

“…Established on a solved power flow, a technique uses Z-bus to find the loss components linked with different buses [10], whereas in [11], a modified Y-bus is used to find the association among the branch currents and the load/generator current injections permitting the power loss of respective line to be expressed in terms of current injection. This paper proposed a method to separate losses for restructured power system based on circulating current method with the help and some modification in N-R method.…”