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Microgrid delay margin calculation method based on critical eigenroot tracking

A computing method and micro-grid technology, applied in computing, electrical components, circuit devices, etc., can solve problems such as endangering system stability, poor dynamic performance of micro-grid, steady-state deviation of output voltage, etc.

Active Publication Date: 2019-12-17
SOUTHEAST UNIV
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Problems solved by technology

[0004] Droop control has attracted attention because it can achieve power sharing without communication, but the output voltage of each distributed power supply will have a steady-state deviation. Therefore, it is necessary to adopt microgrid secondary voltage control to improve reactive power sharing effect and voltage performance
At present, the coordinated voltage control designed is a centralized control structure. The centralized voltage controller of the microgrid generates control signals and sends them to the local controllers of each distributed power supply. This centralized control structure relies on communication technology, but the communication process is usually controlled by The impact of information delay and data packet loss, information delay, data packet loss and other effects lead to poor dynamic performance of the microgrid and even endanger system stability

Method used

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  • Microgrid delay margin calculation method based on critical eigenroot tracking
  • Microgrid delay margin calculation method based on critical eigenroot tracking
  • Microgrid delay margin calculation method based on critical eigenroot tracking

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Embodiment Construction

[0027] The technical solution of the invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the microgrid delay margin calculation method based on critical characteristic root tracking disclosed by the present invention includes the following steps:

[0029] Step 10) Based on the static output feedback, establish the closed-loop small-signal model of the inverter including the communication delay voltage feedback control quantity

[0030] Each distributed power supply sets the inverter output voltage and frequency reference command through the droop control loop in the local controller, as shown in formula (1):

[0031]

[0032] In formula (1), ω i Indicates the local angular frequency of the i-th distributed power generation; ω n Indicates the reference value of the local angular frequency of the distributed power supply, unit: radian / second; m Pi Indicates the frequency droop characteristic coeffi...

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Abstract

A microgrid delay margin calculation method based on critical characteristic root tracking includes: establishing a microgrid closed-loop small-signal model with voltage feedback control amount including communication delay based on a static output feedback, so as to obtain a characteristic equation with a transcendental term, performing critical characteristic root locus tracking for the transcendental term of the system characteristic equation, searching for a possible pure virtual characteristic root, and further calculating the maximum delay time in a stable microgrid. The method studies the relationship between the controller parameters and delay margins, thereby guiding the design of the control parameters, effectively improving the stability and dynamic performance of the microgrid.

Description

technical field [0001] The invention discloses a micro-grid delay margin calculation method based on critical characteristic root tracking, and in particular relates to a calculation method for a micro-grid secondary voltage control delay margin, which belongs to the technical field of micro-grid operation control. Background technique [0002] With the depletion of the earth's resources and people's attention to environmental issues, the access to renewable energy has attracted more and more attention from all over the world. Microgrid is an emerging energy transmission mode that increases the penetration rate of renewable energy and distributed energy in the energy supply system, and its components include micro gas turbines, wind turbines, photovoltaics, fuel cells, energy storage devices, etc. Distributed Energy Resources (DER), user terminals of various electric loads and / or heat loads, and related monitoring and protection devices. [0003] The power supply inside the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F17/50G06Q50/06
CPCG06Q50/06G06F30/20H02J3/00H02J2203/20H02J3/16H02J3/381H02J3/50Y02E40/30Y02P80/14H02J3/001
Inventor 楼冠男顾伟曹戈柳伟陈明
Owner SOUTHEAST UNIV
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