A kind of DC bus voltage regulation control method of microgrid system

Abstract

The invention discloses a DC bus voltage stabilization control method for a micro-grid system. The DC bus voltage stabilization control method comprises the steps of: constructing DC micro-grid models in an energy storage system charging mode and an energy storage system discharging mode based on structural characteristics and operating characteristics of a DC micro9-grid; acquiring mixed potential function models in the charging mode and the discharging mode according to the DC micro-grid models; carrying out voltage stabilization analysis on the mixed potential function models to obtain voltage stabilization control design criteria corresponding to the charging mode and the discharging mode; and setting voltage controller parameters of corresponding convertors according to the obtained voltage stabilization control design criteria, so that the micro-grid system operates in a voltage-stabilized manner. The DC bus voltage stabilization control method for the micro-grid system can ensure that the bus voltage in the DC micro-grid system is always in a stable operating state, and improve the safety performance of system operation.

Description

technical field [0001] The present invention relates to the relevant technical field of DC micro-grid systems operating in isolated islands, in particular to a DC bus bar voltage stabilization control method for micro-grid systems. Background technique [0002] The DC microgrid can be in two working states: islanded and grid-connected. The grid-connected DC microgrid is backed by the large power grid, and the bus voltage remains constant. In the microgrid system operating in an isolated island, refer to figure 1 As shown, it is a schematic diagram of the simplified DC microgrid system provided by the present invention. When the generating power is higher than the load power, the bus voltage increases; when the generating power is lower than the load power, the bus voltage decreases. The battery system needs to quickly absorb or provide excess power when the power generation and power consumption do not match, maintain power balance, and maintain a constant bus voltage. If...

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Problems solved by technology

However, due to the slow dynamic response and long adjustment time of the current DC microgrid control system, it is difficult to keep the bus voltage in a stable state.

[0003] Therefore, in the process of implementing the present application, the inventors found that the prior art has at least the following defects: the bus voltage in the current DC microgrid system is difficult to maintain stability, and will deviate from the rated value with the change of generated power or load power

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