Micro-grid off-grid coordinated control method

Abstract

The invention discloses a micro-grid off-grid coordinated control system and method. The micro-grid off-grid coordinated control system comprises at least two intermittent power sources, an energy storage unit, an important load, a non-important load and a coordinated controller, a V / F control mode is adopted to the energy storage unit, and a PQ control mode is adopted to the intermittent power sources. The micro-grid off-grid coordinated control method includes the steps that data information of the power and SOC values of the intermittent power sources, the energy storage unit and the loads is collected through the coordinated controller, judgment on information of the power and the SOC of an energy storage battery, states of a breaker and the power of the intermittent power sources is carried out through the coordinated controller, the two intermediate links of energy storage power management and intermittent power source power adjustment are carried out, control commands of the intermittent power sources and the loads are formed, power adjustment values and signal output values are issued to a power generating unit and the loads through a communication line, and control over the intermittent power sources and the loads is completed. According to the micro-grid off-grid coordinated control method, comprehensive coordination control over the micro-grid internal power sources, the energy storage unit and the loads is achieved, and long-term, stable and effective off-grid operating of a micro-grid can be guaranteed.

Description

technical field [0001] The invention relates to a microgrid off-grid coordination control method, and belongs to the technical field of new energy power generation. Background technique [0002] The global energy crisis and environmental problems have promoted the rapid development of renewable energy power generation. While improving the energy structure, renewable energy generation also introduces some technical issues, among which research on grid access issues forms the research field of distributed generation (DG). The characteristics of flexible and decentralized DG locations are well adapted to the decentralized power demand and resource distribution, and delay the huge investment required for the upgrade of the transmission and distribution network. However, DG stand-alone access costs are high, the capacity is small, and the operation uncertainty is strong, which is somewhat restricted. Due to natural conditions, the lack of flexible and controllable features is an...

AI Technical Summary

Problems solved by technology

[0005] The micro-grid can be operated in grid-connected mode or independently. When grid-connected, the long-term stable operation of the micro-grid is guaranteed due to the support of the grid. The coordinated control of the micro-grid focuses on responding to the needs of the grid; The voltage frequency is maintained by the local control of the equipment, but the local control cannot guarantee the stable operation of the microgrid for a long time off-grid, so the coordinated control of the microgrid is used to ensure the long-term reliable operation of the microgrid

[0006] At present, there are few studies on off-grid coordinated control methods for microgrids, and they are not closely integrated with actual projects. Under the trend of increasing domestic microgrid projects, it is of great engineering significance to study a typical off-grid coordinated control strategy for microgrids.

Images