Study on Grid Access of Distributed Power Stations Based on Power Supply Efficiency of Source-load Node Pair

doi:10.19596/j.cnki.1001-246x.8736

Abstract

Abstract:

The optimal site selection of distributed power stations on a weighted network is studied by combining the topology and electrical characteristics of the network. Firstly, the second-order Kuramoto-like phase oscillator model is used to model the power grid, and the network power flow value under equal coupling strength is used to weight the power grid lines to construct a weighted network model of the power grid; by calculating the transmission efficiency from each load node to each generator node and the power absorbed by each load node from each generator node, which defines the power supply efficiency index of source-load node pair. Then, according to the power supply efficiency value of the source-load nodes of each load node, three grid access methods are defined. The influence of three different grid access methods of distributed power stations on the synchronizability of the grid is studied on the coupling weighted network. Study shows that the access mode of distributed power stations is the best in order to arrange the power supply efficiency value from small to large, followed by the way of randomly selects load nodes, and the way in which the power supply efficiency value is arranged in descending order is the worst. Therefore, the power grid can achieve better synchronizability when the distributed power stations connect to the power grid on the load node with the lower power supply efficiency index of the source-load node pair.

Key words: grid access of distributed power stations, coupling weighted network, power supply efficiency, power flow tracking

CLC Number:

TM712

Kexiang WU, Yanli ZOU. Study on Grid Access of Distributed Power Stations Based on Power Supply Efficiency of Source-load Node Pair[J]. Chinese Journal of Computational Physics, 2024, 41(4): 515-522.

Figures/Tables 7

Fig.1 Network topology of IEEE30 system (a) IEEE30 unweighted undirected network; (b) IEEE30 weighted undirected network

Fig.2 Network topology of IEEE57 system (a) IEEE57 unweighted undirected network; (b) IEEE57 weighted undirected network

Fig.3 IEEE14 weighted directed network(Arrows and numbers indicate direction and magnitude of power folow, respectively.)

Fig.4 Power supply efficiency Si of source-load node pair of power grid node i (a) IEEE30 system; (b) IEEE57 system

Fig.5 The relationship between steady-state order parameter, steady-state frequency offset and coupling strength KW in IEEE30 weighted network (a) steady-state order parameter; (b) steady-state frequency offset

Fig.6 The relationship between steady-state order parameter, steady-state frequency offset and coupling strength KW in IEEE57 weighted network (a) steady-state order parameter; (b) steady-state frequency offset

Fig.7 The relationship between the critical synchronous coupling strength KWc and the proportion β of new DGs network access (a) IEEE30 weighted network; (b) IEEE57 weighted network

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