Distributed fixed time coordinated control method of islanded microgrid

A fixed time, coordinated control technology, applied to electrical components, circuit devices, AC network circuits, etc., to achieve the effect of small amount of communication calculation and high reliability

Active Publication Date: 2017-12-12
CHONGQING UNIV
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  • Distributed fixed time coordinated control method of islanded microgrid
  • Distributed fixed time coordinated control method of islanded microgrid
  • Distributed fixed time coordinated control method of islanded microgrid

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Embodiment Construction

[0048] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0049] The proposed distributed coordinated control microgrid such as figure 1 As shown, each distributed generation (DG) unit in the microgrid is equipped with a local controller and a communication transceiver, and the communication transceiver exchanges information with adjacent DG units through sparse distributed communication links. The DG unit is composed of DC energy source, voltage source inverter, LC filter, RL connector, voltage and current sensor, etc. The local controller generates the control signal of the inverter according to the primary and secondary control functions. The single DG The block diagram of distributed coordination control is as follows: figure 2 shown.

[0050] The primary control of the local controller includes three parts: power controller, voltage controller and current controller. The primary control g...

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Abstract

The invention relates to a distributed fixed time coordinated control method of an islanded microgrid, and belongs to the field of microgrid operation control. The method in particular comprises the following steps: judging whether a deviation between the frequency and voltage of droop control of a power controller exists or not, if not, not carrying out information communication and data calculation related to two-stage control; if yes, activating the two-stage control, selecting a suitable frequency reference value and a voltage reference value for the droop control of an ith DG unit, thereby enabling output frequency and output voltage of the DG unit to be restored to rated values within a fixed time, and accurately distributing active power, and closing the two-stage control. The distributed coordinated control scheme provided by the invention ensures that the output frequency and voltage of all DG units are restored to the rated values within the fixed time designed in advance after disturbance occurs in the system and output active power of the DG units is accurately distributed, the power quality of the microgrid is improved, and the electricity utilization safety of sensitive loads is ensured.

Description

technical field [0001] The invention belongs to the field of micro-grid operation control, and relates to a distributed fixed-time coordinated control method for island micro-grids. Background technique [0002] The energy crisis and environmental pollution promote the development of clean and renewable energy sources, such as solar energy, wind energy, etc., which generate electricity in the form of distributed generation. In order to give full play to the benefits of distributed power generation, the microgrid integrates distributed power generation, energy storage devices, local loads, etc. to form a small-scale power system, which can be connected to the grid or isolated. The island microgrid requires distributed power generation units to provide frequency and voltage support, as well as to achieve load sharing. One-stage droop control is used to achieve this function, but the droop control causes the frequency and voltage to deviate from the nominal value. To eliminat...

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Application Information

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IPC IPC(8): H02J3/48
CPCH02J3/388H02J3/48Y02P80/14
Inventor 陈刚李志勇
Owner CHONGQING UNIV
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