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Island micro-grid distributed cooperative control method based on hierarchical control strategy

A distributed coordination and hierarchical control technology, which is applied in the direction of electrical components, circuit devices, single-network parallel feeding arrangements, etc., can solve the problems of inability to achieve reasonable distribution of reactive power, etc.

Active Publication Date: 2018-01-12
YANSHAN UNIV
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Problems solved by technology

Simple droop control cannot achieve the expected reference value for the voltage and frequency values ​​of the microgrid system, and droop control cannot achieve a reasonable allocation of reactive power

Method used

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  • Island micro-grid distributed cooperative control method based on hierarchical control strategy
  • Island micro-grid distributed cooperative control method based on hierarchical control strategy
  • Island micro-grid distributed cooperative control method based on hierarchical control strategy

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Embodiment Construction

[0069] The present invention will be further explained below in conjunction with the drawings:

[0070] Such as Figure 5 As shown, a distributed coordinated control method for an island microgrid based on a hierarchical control strategy includes the following steps:

[0071] Step 1. A two-layer control strategy is proposed. In the overall conceptual diagram of the hierarchical control, it is divided into two layers: the network control layer and the local control layer.

[0072] Step 1-1, build a local control layer: the control layer consists of distributed power DER, inverter, Park conversion link, power calculation link, PU / Q-ω droop control link, voltage synthesis link, voltage outer loop, current inner loop Ring and PWM signal generator; under normal conditions, all parts work together;

[0073] Combine figure 1 For the i-th DER, the specific control process is as follows:

[0074] Step 1-1-1, the distributed power supply drives the load to run through the inverter interface and...

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Abstract

The invention provides an island micro-grid distributed cooperative control method based on a hierarchical control strategy. The method comprises the steps of firstly constructing a hierarchical control structure into two structures of a local control hierarchy and a network control hierarchy; secondly, studying P-U / Q-omega droop control, wherein the P-U / Q-omega droop control is used as primary control of all distributed power sources and angular frequencies; then, introducing a communication network composed of all distributed power sources in a micro-grid in combination with a graph theory and a multi-intelligent-body theory; on the basis of the communication network, designing a novel Virtual leader-following consistency protocol which considers a time delay problem and using the protocol to complete secondary control of all the distributed power source voltages and the angle frequencies; finally, achieving reasonable distribution of active power by designing a current controller. According to the island micro-grid distributed cooperative control method based on the hierarchical control strategy, it is ensured that the distributed power source voltages and the angle frequenciesobtain a reliable control effect, and the effect that the active power is reasonably distributed according to the rated capacities of the distributed power sources is achieved.

Description

Technical field [0001] The invention relates to the field of smart grid control, in particular to a method for designing a distributed coordinated control strategy for an island microgrid based on a hierarchical control strategy. Background technique [0002] Micro-Grid is also translated as micro-grid, which refers to a small power generation and distribution system composed of distributed energy resources (DER), energy storage devices, energy conversion devices, loads, monitoring and protection devices, etc. The microgrid is an autonomous system that can realize self-control, protection and management. It can operate in parallel with the external grid or operate in an isolated island. Since all kinds of distributed power sources and energy storage devices in the microgrid are connected to the main network through the inverter composed of high-frequency power electronic devices as the main component, the control of the microgrid can be understood as Control of inverters used in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J13/00
CPCY02E40/70Y04S10/12
Inventor 窦春霞张博张占强罗维张亚民
Owner YANSHAN UNIV
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