A control strategy for microgrid in-situ operation based on embedded controller
An embedded controller and operation control technology, applied in the direction of single-net parallel feeding arrangement, electrical components, circuit devices, etc., can solve problems such as difficulty in absorbing electric energy, lack of adjustable thermal load, and slow response speed
Active Publication Date: 2015-11-18
GUODIAN NANJING AUTOMATION
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[0003] This method has the disadvantages of slow response speed, difficulty in secondary release of absorbed electric energy, and reduced quality of electric energy utilization, and lacks generality, so it cannot be applied to microgrids that lack adjustable thermal loads.
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[0044] In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific embodiments.
[0045] The embedded controller of the present invention is an important part of the micro-grid control system and must run in the micro-grid control system. Microgrid control system architecture includes:
[0046] (1) Local control layer: implement autonomous control operation by collecting information such as local power.
[0047] (2) Middle layer: The main device of the middle layer is the embedded controller, and the engineer can debug the middle layer program on site through the industrial computer or personal PC. The middle layer monitors the real-time information of each distributed power controller, sampling device, and energy storage system in real time, and issues control strategy instructions and protection commands to each device.
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The invention discloses a micro-grid on-site operation control strategy on the basis of an embedded controller. The micro-grid on-site operation control strategy comprises the following steps of: acquiring phase voltages, phase currents, instantaneous currents of each power feeder and instantaneous currents of each load feeder; calculating a tie line real-time instantaneous active power, a power-supply instantaneous active power and a load instantaneous active power; feeding a power-supply injection bus active power sample and a load adsorption bus active power sample into a comparator to obtain a difference value, wherein a current control period output of a low-pass digital filter is a tie line active power reference value in a current control period; feeding the tie line active power reference value and the current tie line real-time instantaneous active power into the comparator to obtain a difference value; after adding the difference values, an energy storage system loss compensation value and an energy storage system active power reference value in a previous control period, obtaining an energy storage system active power reference value in the current control period and sending the energy storage system active power reference value in the current control period to an energy storage converter. The micro-grid on-site operation control strategy has a high response speed; electric energy can be released for the second time; the micro-grid on-site operation control strategy can be widely applied to various micro-grid systems.
Description
technical field [0001] The invention relates to an on-site operation control strategy of a micro-grid based on an embedded controller, and belongs to the technical field of an intelligent micro-grid. Background technique [0002] At present, in the field of smart micro-grid technology, the power of the tie-line of the micro-grid is generally smoothed by adjusting the adjustable thermal load. [0003] This method has the disadvantages of slow response speed, difficulty in secondary release of absorbed electric energy, and reduced quality of electric energy utilization, and lacks generality, so it cannot be applied to microgrids that lack adjustable thermal loads. Contents of the invention [0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a microgrid local operation control strategy based on an embedded controller, which has a fast response speed and secondary release of electric energy, and can be widely used ...
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IPC IPC(8): H02J3/00H02J3/38
Inventor 盛德刚陈东张少强孙攀
Owner GUODIAN NANJING AUTOMATION