Method and system for improving segmented droop control of direct current micro-grid under continuous load condition
A DC microgrid, load current technology, applied in the direction of load balancing, DC network circuit devices, electrical components, etc. in the DC network, can solve problems such as uneven current, and achieve the effect of reducing complexity
Active Publication Date: 2018-09-28
ANHUI UNIVERSITY OF TECHNOLOGY
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[0007] The present invention provides a method and system for improving the segmental droop control of a DC microgrid under continuous load conditions in view of the fact that the current segmental multi-slope droop control strategy is uneven in the system at the current segmental point; the present invention particularly considers Add communication links and hysteresis control to the existing segmented multi-slope droop control strategy, use the communication bus to share the current information of each module, calculate the average current in the local controller, and eliminate the average current at the segment point through hysteresis control According to the disturbance of the average current as the judgment condition of the load partition, the current sharing performance of the system at the current segmentation point is improved
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[0045] combine figure 1 For the method control flow chart of the present invention to improve the DC microgrid segmental droop control system under continuous load conditions, the output current of each module realizes information sharing through the communication bus, and obtains the average current I avg , through the hysteresis control to eliminate the influence of the average current disturbance on the subsection point of the system, according to the size of the average current, select the droop control algorithm corresponding to the load area, and execute the corresponding control algorithm through digital control. The specific implementation process is as follows:
[0046] Step 1. Collect the output current i of each module oj They are respectively sent to the communication bus of the communication link, each module receives the current information on the communication bus, transmits it to the local controller, and calculates the average value of the output current I av...
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The invention discloses a method and system for improving segmented droop control of a direct current micro-grid under a continuous load condition. In order to solve the problem that an existing segmented multi-slope droop control strategy has uneven system current at a load interval segmentation point, mutual communication between modules is used for achieving current information sharing, an average current value is calculated in a local converter module, and the average current value is compared with a current segmentation point, and working intervals of the modules are determined, thus thecurrent sharing problem of the system at a segmentation point of a continuously varying load interval is solved; and in addition, hysteresis control is added to eliminate the adverse effect of the average current disturbance on the interval segmentation point. The method only needs to collect current information of each module to average in a local controller, and the average current is used for determining an interval working interval; and an additional PI controller does not need to be added, the current sharing performance and the bus voltage adjustment rate of the existing segmented multi-slope droop strategy in a full-load continuously varying interval are more perfect.
Description
technical field [0001] The invention relates to the technical field of power output balance of a micro-source converter in a DC micro-grid and the design of improving the system bus voltage adjustment rate, in particular to an improvement method for a DC micro-grid segmental droop control system under continuous load conditions. Background technique [0002] With the development of new energy and people's increasing awareness of energy conservation and emission reduction, power system energy is moving towards green and sustainable development. As an important component of smart grid, microgrid is an effective form to realize the integration and utilization of distributed energy. The influence of reactive power and frequency is not considered in the DC microgrid system, which improves the efficiency and power supply quality of the system. Its main control goal is to obtain a lower bus voltage regulation rate and power sharing of each distributed power supply. [0003] Due t...
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IPC IPC(8): H02J1/00H02J1/14
CPCH02J1/00H02J1/14
Inventor 刘宿城李中鹏刘晓东方炜
Owner ANHUI UNIVERSITY OF TECHNOLOGY