System for calculating power supply abundance of urban power network

Abstract

The invention relates to a system for calculating power supply abundance of a urban power network, which is characterized by comprising an equivalent model fitting module, a trust domain subproblem solution module, a target function real descend value solution module, a target function searching step-length searching direction adjusting module and an alternating current power flow calculating module; the network basic data and the calculated initial value of the city electric network are input into a calculating system; in the equivalent model fitting module, the equivalent second-order modelof the target function is output according to the basic data and calculated initial value; when the HESSEN matrix norm value of the equivalent second-order model is smaller than permissible error, namely the abundance value of power supply capability of the power network is output finally by the target function real descend value solution module. The system for calculating power supply abundance of the urban power network fully exerts the advantages of effectiveness and local superlinear convergence when the trust domain method is used for solving morbidity optimization problem, simultaneously the alternating current power flow algorithm reflects the influence of voltage level of the system, transmission capability of branches and reactive power flow to the power supply capability of the network precisely, and the voltage constraint of all nodes in the network can be calculated.

Description

technical field [0001] The invention relates to a power system calculation system, in particular to a city power grid power supply adequacy calculation system. Background technique [0002] The evaluation of the adequacy of the power supply capacity of the urban power grid mainly evaluates the power supply margin of the power grid by solving the maximum power supply capacity of the urban power grid, and then comparing it with the current power load level of the power grid. The adequacy assessment of urban power supply capacity involves urban transmission network, high-voltage distribution network and low-voltage distribution network, and the expression of its objective function is as follows: [0003] UNPSAI = MNSPL MPL - - - ( 1 ) [0004] Equation (1) expresses that the power supply adequacy value UNPSAI of the urban power grid is the ratio of the ...

AI Technical Summary

Problems solved by technology

[0011] To sum up, the evaluation of the power supply capacity margin of the urban power grid needs breakthroughs in the following aspects: (1) The calculation of the power supply capacity assessment manually through the AC power flow is huge, time-consuming and labor-intensive, and the calculation accuracy is difficult to grasp

(2) The power supply capacity analysis of the DC power flow method combined with the optimization method cannot take into account the reactive power and voltage constraints of the network, and the obtained results still need to be verified by the calculation of the AC power flow

The control step size is introduced because traditional linear search methods often fail due to too large step size, especially when the problem is ill-conditioned

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