Power distribution network comprising direct-current distributed power supply and analysis method of comprehensive load characteristics of power distribution network

Abstract

The invention relates to a power distribution network comprising a direct-current distributed power supply and an analysis method of comprehensive load characteristics of the power distribution network. The power distribution network comprises static loads, a dynamic load bus and comprehensive loads, wherein the static loads are equivalent static loads formed by combining static load elements and the direct-current distributed power supply, a model structure of the comprehensive loads is a generalized comprehensive load model structure and comprises a reactive compensation device, static loads, induction motor loads, an equivalent power supply, a power distribution network equivalent impedor, the reactive compensation device, the static loads, the equivalent power supply and an induction motor are connected in parallel and are connected to an external system through the power distribution network equivalent impedor. The model structure of the comprehensive loads adopted in the power distribution network can integrally describe various load characteristics of nodes, and the problem that after a large number of distributed power generation devices are connected to the power distribution network, the power distribution network affects the comprehensive load characteristics is solved.

Description

technical field [0001] The invention relates to the technical field of distribution network, in particular to a distribution network with DC distributed power supply and an analysis method for its comprehensive load characteristics. Background technique [0002] Most of the distributed power generation equipment is connected to the distribution network side of 10kV and below (except for centralized access to the main network such as large-scale wind farms). The physical locations are widely distributed, the operating characteristics are different, and the capacity ratio is gradually increasing. The power supply and grid planning, operation scheduling and control of the modern power system will have a non-negligible impact. In the power system simulation calculation as the basic decision-making basis for power grid planning, design and operation dispatching control, the load model is an equivalent description of the "comprehensive load" characteristics of the main grid substa...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a distribution network with DC distributed power supply and an analysis method for its comprehensive load characteristics. The comprehensive load model adopted in the distribution network not only considers the equivalent motor load and static load, In addition to the equivalent impedance between the grids and the reactive power compensation device of the distribution network, the equivalent power supply under the node is also considered, which can simulate the load and distribution system more completely, and can completely describe the various load characteristics of the node. It is used to solve the problem that after a large number of distributed power generation equipment is connected to the distribution network, the distribution network will affect the comprehensive load characteristics and the existing CSLM model will deteriorate the operating conditions of the motor

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