Stability determination method for DC distributed system in peer-to-peer control mode

A distributed system and peer-to-peer control technology, applied in the field of stability analysis, can solve problems such as complex system matrix, unclear physical meaning, and difficulty in generalizing stability criteria, and achieve the effect of wide application range and simplified calculation
CN107544249AInactive Publication Date: 2018-01-05ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2018-01-05
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to the stability analysis technology of the DC distributed system and aims to provide a stability determination method for a DC distributed system in a peer-to-peer control mode.The method comprises steps that Thevenin / Norton equivalent is carried out for a power source or a load through utilizing a unit connection method, an impedance matrix or an admittance matrix is constructed according to impedance or admittance of the power source, the load or a system mode; each matrix is inputted to stability criteria to acquire characteristic values of a system, if the characteristic values of the system are all on a left half plane, the system is stable; if characteristic values of a right half plane are contained in the characteristic values of the system, the system isunstable. The method is advantaged in that the stability criteria has no specific requirements for the system structure, the method is suitable for radiation type systems and annular systems, and theapplication scope is wide; the method can be used for effectively analyzing stability of complex DC distributed systems including multi-sagging control type power sources, current control type power sources, constant current loads, constant power loads and system inter-node impedance, and impedance regulation measures are carried out to guarantee stability of the systems.
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Description

technical field

[0001] The invention belongs to the stability analysis technology in the DC distributed system technology, and in particular relates to a stability judgment method of the DC distributed system under a peer-to-peer control mode. Background technique

[0002] With the massive access of renewable new energy, the DC distributed system is widely used as a highly efficient system. A DC distributed system is generally composed of multiple power supplies, loads and other power modules. Multiple power supplies adopt peer-to-peer control, that is, multiple controllable and adjustable energy storage units adopt droop control for voltage support and current sharing. , the photovoltaic power generation unit with large random fluctuation adopts current control as the current control type power supply. Usually, a single power module can ensure stability when running independently during control design, but it will affect each other when forming a system, reducing system st...

Claims

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