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Method and system for analyzing stability of distributed DC grid

A DC power grid, distributed technology, applied in the direction of load balance in the DC network, parallel operation of DC power supplies, AC network circuits, etc., to achieve the effect of ensuring stability

Pending Publication Date: 2019-07-12
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of judging the stability of the grid system existing in the prior art, the present invention provides a method and system for analyzing the stability of a distributed DC grid. Starting from the physical structure of the DC grid, using the relevant content of the linear theorem, the Analyze the stability of the DC distributed power grid and obtain specific criteria. The analysis process provided by the present invention has a certain general significance and can be applied in similar system analysis

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  • Method and system for analyzing stability of distributed DC grid
  • Method and system for analyzing stability of distributed DC grid
  • Method and system for analyzing stability of distributed DC grid

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Embodiment 1

[0090] Such as figure 1 As shown, the stability analysis method of a kind of distributed DC grid of the present invention comprises:

[0091] Step S1. Obtain an open-loop equivalent transfer function based on the topology structure of the distributed DC power grid and a pre-built stability analysis model;

[0092] Step S2, applying the Nyquist stability criterion to the open-loop equivalent transfer function to determine the stability of the distributed DC power grid;

[0093] The stability analysis model is that the power electronic transformer, the photovoltaic power generation system and the energy storage system in the distributed DC power grid are respectively equivalent to a DC / DC circuit, and the DC / DC circuit is constructed using the superposition principle.

[0094] According to the actual situation of power electronic transformer, DC distributed power supply and load, this embodiment designs such figure 2 The typical topological structure shown in the figure, and ...

Embodiment 2

[0191] Based on the same inventive concept, the present invention also provides a stability analysis system for a distributed DC power grid, including:

[0192] The acquisition module is used to obtain the open-loop equivalent transfer function based on the topology structure of the distributed DC power grid and a pre-built stability analysis model;

[0193] A determining module, configured to apply the Nyquist stability criterion to the open-loop equivalent transfer function to determine the stability of the distributed DC power grid;

[0194] The stability analysis model is that the power electronic transformer, the photovoltaic power generation system and the energy storage system in the distributed DC power grid are respectively equivalent to a DC / DC circuit, and the DC / DC circuit is constructed using the superposition principle.

[0195] In an embodiment, the system also includes a construction module for constructing a stability analysis model;

[0196] The building blo...

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Abstract

The invention provides a method and system for analyzing the stability of a distributed DC grid. The method comprises a step of obtaining an open-loop equivalent transfer function based on the topology structure of the distributed DC grid and a pre-built stability analysis model, and a step of applying the Nyquist stability criterion to the open-loop equivalent transfer function to determine the stability of the distributed DC grid, wherein a power electronic transformer, a photovoltaic power generation system and an energy storage system in the distributed DC grid are equivalent to DC / DC circuits and the DC / DC circuits are constructed by using a superposition principle according to the stability analysis model. According to the invention, the stability of the DC grid constructed by a DC / DC converter is clearly provided, the grid system shutdown protection caused by faults such as load sudden change, power supply fluctuation or system disturbance of a grid system is avoided, and the stability of the power supply of the grid system is ensured.

Description

technical field [0001] The invention relates to a distributed direct current power grid, in particular to a method and system for analyzing the stability of a distributed direct current power grid. Background technique [0002] At present, due to the gradual deepening of the concept of energy conservation and environmental protection, distributed DC power grids are more and more widely used, especially DC power grids that include a large number of new energy power generation equipment and power electronic loads are already a direction for future power grid development. New energy power generation equipment includes biomass power generation, gas turbines, solar power generation and photovoltaic cells, fuel cells, wind power generation, microcomputer gas turbines, and internal combustion engines. A DC power grid composed of a large number of power electronic devices, when the stability margin of the DC power grid system is relatively small, when the load of the power grid syst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02J1/14H02J3/38H02J3/32
CPCH02J3/383H02J1/10H02J1/14H02J3/32H02J2203/20Y02E70/30Y02E10/56
Inventor 李洋何国庆陈亮
Owner CHINA ELECTRIC POWER RES INST
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