Electric power collector system for alternating-current and direct-current microgrid

Abstract

The invention discloses an electric power collector system for an alternating-current and direct-current microgrid. The system comprises a power electronic solid-state module, a monitoring module, an information processing module, an intelligent control module, a communication module, an energy storage module and an electric energy interface module. The communication module and the electric energy interface module are respectively connected with the power electronic solid-state module; the intelligent control module, the monitoring module and the information processing module are respectively connected with the communication module; the other end of the monitoring module is connected with the information processing module. By adoption of the technical scheme, a structure and a control process of distributed power source access equipment are greatly simplified, energy exchange and grid connection of the microgrid and a power distribution network are managed in a unified manner by the electric power collector system, integral control is realized, faults and interference between the microgrid and the power distribution network can be isolated completely, and unified control of power quality is realized.

Description

technical field [0001] The invention relates to flexible AC power transmission and distribution technology, in particular to a power energy collector system of an AC-DC micro-grid. Background technique [0002] Due to the intermittent and random characteristics of wind power, solar power and other green renewable energy power generation, traditional power equipment, grid structure and operation technology are increasingly unable to accommodate more and more distributed renewable power sources. Access to the distribution network is an effective method to solve the high penetration rate of distributed power generation access to the distribution network. However, the current way of constructing a microgrid basically adopts the method that each distributed power source uses its own power electronic grid-connected inverter to connect to the AC line on the low-voltage side of the distribution transformer or uses a power electronic rectifier to increase the DC line. The power supp...

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Problems solved by technology

figure 1 It is a structural diagram of a traditional AC microgrid; although this method solves the access of distributed power sources within a certain range, due to the various grid-connected converters, it is necessary to solve the problems of distributed power machine-side control and energy transfer and also take into account the power grid Tracking and grid-connection problems make centralized management difficult, which is not conducive to the coordination and optimization of energy management, and the efficiency is low, and other power quality control equipment is required. This method is not conducive to the construction of micro-grids, and it is even more difficult to realize the plug-and-play function

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