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Adaptive synchronization frequency control method for island microgrid based on coherence strategy

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

Active Publication Date: 2018-12-21
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

Method used

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  • Adaptive synchronization frequency control method for island microgrid based on coherence strategy
  • Adaptive synchronization frequency control method for island microgrid based on coherence strategy
  • Adaptive synchronization frequency control method for island microgrid based on coherence 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) Load frequency control principle and mathematical model

[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 performs f...

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Abstract

The invention provides an island microgrid adaptive synchronization frequency control method based on a consistency strategy. Firstly, a new generalized dynamic LFC model and a robust decentralized LFC control strategy are proposed for a power system composed of a regional interconnected microgrid (MG) on the basis of load frequency control (LFC) related technology. This paper describes the LFC mechanism of single-area and multi-area control system. The classical LFC method is applied to the power system composed of multi-area interconnected MG with changeable running scene. Then, an LFC algorithm based on consistency strategy is proposed for multi-area interconnected power systems. The speed governor and the power transmission of ESS are managed, and the adaptive synchronization control of distributed islanding MG in multi-area is realized. At last, that power system simulation model composed of six area randomly interconnected MG is built to verify the correctness and effectiveness of the algorithm of the invention, 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 method for controlling the frequency of the microgrid. 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 gradually tend to zero under the condition of continuous adjustment of the active power of the unit, and ma...

Claims

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Application Information

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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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