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Large signal stability analysis method for AC microgrid system considering dynamic performance of energy storage system and constant power load

A constant power load and energy storage system technology, applied in the direction of AC network circuits, AC network load balancing, electrical components, etc.

Inactive Publication Date: 2019-03-22
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

However, the effectiveness and magnitude of the linearization domain is limited to small perturbations and is powerless in the case of large perturbations

Method used

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  • Large signal stability analysis method for AC microgrid system considering dynamic performance of energy storage system and constant power load
  • Large signal stability analysis method for AC microgrid system considering dynamic performance of energy storage system and constant power load
  • Large signal stability analysis method for AC microgrid system considering dynamic performance of energy storage system and constant power load

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Embodiment 1

[0040] In order to achieve the above-mentioned purpose, this patent is realized in the following ways:

[0041] (1) Topology structure of AC microgrid

[0042] AC microgrid system topology such as figure 1 shown.

[0043] Among them, the battery energy storage unit is connected to the bidirectional AC-DC converter and connected to the AC bus through the LCL filter, and the AC / DC converter connected to the AC side closed-loop control resistor is regarded as a constant power load. In the line, R s and L s Respectively represent the line equivalent resistance and equivalent inductance.

[0044] (2) Model simplification of the AC system

[0045] In order to study the large-signal stability of the AC system simply and directly, it is necessary to simplify the AC microgrid system. Since the system contains an energy storage unit, it is necessary to simplify the model for the two working modes of the energy storage unit in the charging state and the discharging state.

[0046] ...

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Abstract

The invention relates to a large signal stability analysis method for an AC microgrid system considering the dynamic performance of an energy storage system and constant power load. The circuit topology of the AC microgrid is shown in Figure 1. When the energy storage system is in a charging mode, the stability criterion in the charging mode of the storage system can be obtained as follows: C / L1>Pb / V2<2>R1; and when the energy storage system works in a discharging mode, the stability criterion of the energy storage in the charging mode can be obtained as follows: C2 / L1>P2 / V3<2>R1. The AC microgrid is converted into a DC system under a dq rotating coordinate system. The large signal stability criterion is proposed by using a mixed potential function theory. The stability criterion is derived based on the AC microgrid mixed potential function model converted into the DC system. The criterion takes the dynamic performance of the constant power load and the energy storage system into consideration at the same time, gives quantitative constraints on the design of system parameters, ensures the stability of the system under the large disturbance condition and verifies the effectiveness by simulation.

Description

technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a large-signal stability analysis method of an AC microgrid system considering the dynamic performance of an energy storage system and a constant power load. Background technique [0002] AC microgrids have been introduced as a solution to future grid challenges, such as the rapid increase in electricity demand, obtaining energy from renewable sources, and ensuring the quality and reliability of electricity supply. Distributed energy sources, loads, and energy storage systems are all connected to the AC microgrid through power electronic converters. Both the closed-loop controlled converter load and the motor load can be considered constant power loads and have negative incremental impedances, which can cause system instability problems. The stability of AC microgrids, affected by the high penetration of constant power loads, has become a big problem. Previous metho...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/32
CPCH02J3/382H02J3/32H02J2203/20
Inventor 刘欣博孙晓溪高卓
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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