Direct-current microgrid voltage and current distributed compromise control system
A DC micro-grid, voltage and current technology, applied in parallel operation of DC power supplies, DC network circuit devices, electrical components, etc., can solve problems such as equipment failure, bus voltage exceeding the working range, and voltage difference cannot be effectively controlled
Active Publication Date: 2021-10-22
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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- Application Information
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Problems solved by technology
However, the secondary controllers that have been adopted at present can only realize the proportional distribution of power, but cannot effectively control the voltage difference between different buses in the microgrid.
This may cause the voltage of some busbars in the DC microgrid to exceed the reasonable working range, causing the equipment to fail to operate normally.
Method used
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[0052] Embodiments of the present invention will be further and more clearly described below in conjunction with the accompanying drawings. It should be noted that the use of the controller involved in the present invention is not limited to this embodiment, and the controller involved in the present invention can be applied to different DC microgrid structures, and should be included in the scope of protection of the present invention accordingly .
[0053] Such as figure 1 As shown, it is an embodiment of a DC microgrid applicable to the present invention, wherein the DC microgrid electrical network can contain multiple DC buses, and there are no special requirements for the topology and load type of the network, which are all applicable to the collaborative Control System.
[0054] The distributed power supply in the microgrid is represented as a cascaded structure of battery elements and converters in the figure, which may contain various distributed new energy sources i...
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The invention discloses a direct-current micro-grid distributed voltage and current compromise cooperative control system, and the system comprises a plurality of power supply nodes, and each power supply node communicates with a neighbor power supply node in a communication network in a wired or wireless manner; the cooperative controller of each power supply node comprises a primary controller and a secondary controller; the secondary controllers are used for generating a voltage reference signal according to the secondary controller state signals of the power supply node and the neighbor power supply node in the communication network; the primary controllers are used for acquiring a measurement signal of a current output by a current converter at a power supply node, outputting a control signal by using a voltage reference signal and the measurement signal of the current and sending the control signal to the current converter controller, and the current converter controller is used for converting the control signal into a PWM signal and sending the PWM signal to the current converter; and the current converter is used for controlling the bus voltage according to the PWM signal. According to the system, the bus voltage is effectively controlled, so that the bus voltage does not exceed a reasonable working range.
Description
technical field [0001] The invention relates to the technical field of DC micro-grid control, in particular to a DC micro-grid voltage and current distributed compromise control system. Background technique [0002] The DC microgrid is a microgrid composed of DC. It can effectively integrate distributed renewable energy generation devices with DC loads and energy storage equipment to realize local consumption of green energy and improve energy utilization efficiency. Distributed power nodes use converters as access devices to integrate into DC microgrids, and reasonably control the output voltage and current of distributed power nodes. The DC microgrid distributed control system for converters is to ensure the stability of DC microgrids. Critical equipment for normal operation. [0003] The droop control method is the most basic decentralized cooperative control method, which can realize the cooperative work between distributed power sources when there is no communication a...
Claims
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IPC IPC(8): H02J1/10H02J13/00
CPCH02J1/102H02J13/00016H02J13/00026
Inventor 张宏伟
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL