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Adaptive Synchronous Frequency Control Method for Island Microgrid Based on Consistency Strategy

A control method and technology of synchronous frequency, applied in the field of microgrid, can solve problems such as difficult control of system voltage and frequency, complex control principle, etc.

Active Publication Date: 2021-08-31
HOHAI UNIV
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Problems solved by technology

However, its control principle is quite complicated, especially the voltage and frequency of the system in the island mode are not easy to control, so a reasonable real-time control method must be selected to ensure the normal operation of the system

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  • Adaptive Synchronous Frequency Control Method for Island Microgrid Based on Consistency Strategy
  • Adaptive Synchronous Frequency Control Method for Island Microgrid Based on Consistency Strategy
  • Adaptive Synchronous Frequency Control Method for Island Microgrid Based on Consistency Strategy

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Embodiment Construction

[0071] The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments.

[0072] An adaptive synchronous frequency control method for island microgrids based on consensus strategy, such as figure 1 Shown:

[0073] (1) Principle and mathematical model of load frequency control LFC

[0074] Most large synchronous generators are equipped with an auxiliary frequency control loop in addition to the main frequency control loop. The speed governor detects the change of the rotational speed through the main frequency control loop and the auxiliary frequency control loop. In interconnected power systems, the primary control loop is often insufficient to restore system frequency, requiring a transmission in the secondary control loop to adjust the load reference set point. Frequency change with load ΔP L After experiencing an instantaneous change Δf, the auxiliary control loop per...

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Abstract

The present invention provides an island micro-grid self-adaptive synchronous frequency control method based on a consistency strategy. Firstly, on the basis of load frequency control (LFC) related technologies, a new method is proposed for a power system composed of regionally interconnected micro-grids (MG). Generalized dynamic LFC model, robust decentralized LFC control strategy. Describe the LFC mechanism of single-area and multi-area control systems, and apply the classic LFC method to the power system with variable operating scenarios and multi-area interconnected MGs. Then, for the multi-area interconnected power system, a consensus strategy-based LFC algorithm is proposed, which realizes the adaptive synchronization control of distributed island MGs in multiple areas by controlling the turbine-governor and managing the power transmission of the ESS. Finally, the correctness and effectiveness of the algorithm of the present invention are verified by building a power system simulation model composed of 6 randomly interconnected MGs, and the obtained controller can minimize the influence of disturbance and maintain robust performance.

Description

technical field [0001] The invention relates to a microgrid, in particular to a microgrid adaptive synchronization frequency control method. Background technique [0002] Grid frequency is one of the three major indicators of power quality, reflecting the balance between power generation output and load, and is an important control parameter for power system operation. How to maintain the balance between system power generation and load and loss, and keep the frequency stable and the exchange power of the tie line constant, has always been a problem that has attracted much attention. For a power system interconnected between two areas, the task of power system load frequency control LFC is to control and adjust the units of the two systems according to their area control deviation (ACE), so that the respective frequency deviation, tie-line exchange power deviation and ACE In the case of continuous adjustment of the active power of the unit, it gradually tends to zero, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/40H02J3/24
CPCH02J3/24H02J3/381H02J3/40H02J3/388H02J2203/20
Inventor 钟永洁孙永辉翟苏巍侯栋宸吕欣欣
Owner HOHAI UNIV
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