Global capacity announcement of electrical distribution systems: A pragmatic approach

Abstract

a b s t r a c tWe propose a pragmatic procedure to facilitate the connection process of Distributed Generation (DG) with reference to the European regulatory framework where Distribution System Operators (DSOs) are, except in specific cases, not allowed to own their generation. The procedure is termed Global Capacity ANnouncement (GCAN) and is intended to compute the estimates of maximum generation connection amount at appropriate substations in a distribution system, to help generation connection decisions. The pragmatism of the proposed procedure stems from its reliance on the tools that are routinely used in distribution systems planning and operation, and their use such that the possibilities of network sterilization are avoided. The tools involved include: long-term load forecasting, longterm planning of network extension/reinforcement, network reconfiguration, and power flow. Network sterilizing substations are identified through repeated power flow computations. The proposed procedure is supported by results using an artificially created 5-bus test system, the IEEE 33-bus test system, and a part of real-life distribution system of ORES (a Belgian DSO serving a large portion of the Walloon region in Belgium).

Research on Evaluation of Power Supply Capability of Active Distribution Network with Distributed Power Supply with High Permeability

“…The most direct method is the repeat power flow method. The basic idea is: From the current operating point, according to a certain load growth mode, the system load is continuously increased and the power flow calculation is repeated to determine the system PSC [23]. In this paper, the variable step is used to solve the problem [24].…”

Active network management for electrical distribution systems: problem formulation, benchmark, and approximate solution

“…The stochastic processes that we described govern the evolution of the state s (1) t ∈ S (1) of the consumption of loads (flexibility services excluded) and of the power level of energy sources of DGs. We now define the evolution of the components of s (2) t ∈ S (2) by integrating the control actions of the DSO. Concerning the modulation instructions of the generators, we have:…”

“…Nevertheless, with the rapid growth of DGs, the preservation of such conservative margins implies significant network reinforcement costs 2 , because the net energy flow may be reversed, from the distribution network to the transmission network, and flows within the distribution network be very different from the flows historically observed. In order to host a larger share of distributed generation [2] and avoid potentially prohibitive reinforcement costs [3], active network management (ANM) strategies have recently been proposed as alternatives to the fit and forget approach. The principle of ANM is to address congestion and voltage issues via short-term decision-making policies [4].…”

The Use of Black-Box Optimization Method for Determination of the Bus Connection Capacity in Electric Power Grid

“…In the calculation process, technical constraints are considered, such as: maximum capacity of distribution lines, voltage tolerance boundary at network nodes. Cornélusse et al [18] also propose a method for determining the connection capacity of new generation sources to the distribution network. Additionally, in this method the authors use typical tools that are usually used by Network Operators in the planning and operation of distribution systems: long-term load forecasting, long-term network expansion/reconstruction planning, network reconfiguration, and power flow calculation tools.…”

“…The presented method also allows to solve the problem of "network sterilization" described in [17,18]. Correct analysis of the results presented in Tables 2-4 allows to determine such parameters as:…”