Improved droop control method in micro electric network detached island operation control system

A technology of operation control and control method, which is applied in the direction of single-net parallel feeding arrangement, AC network voltage adjustment, sustainable manufacturing/processing, etc., and can solve the problem of output voltage and frequency droop, hardware error control accuracy, and influence of micro-grid voltage amplitude. Value and frequency stability and other issues, to achieve the effect of simple method and eliminate the fluctuation of amplitude and frequency

Inactive Publication Date: 2012-06-20
SHANDONG UNIV
View PDF2 Cites 44 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the droop coefficient can be arbitrarily small in theory, in practical applications, due to the influence of hardware errors and control accuracy, it is often necessary to take a compromise value
In traditional d...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Improved droop control method in micro electric network detached island operation control system
  • Improved droop control method in micro electric network detached island operation control system
  • Improved droop control method in micro electric network detached island operation control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0042] The present invention will be further described below in conjunction with accompanying drawings and examples.

[0043] For the improved droop control method in the microgrid island operation control system, its steps are:

[0044] Step 1. Take k groups of DGs in the microgrid, and the sum of the output impedance and connection impedance of the kth group of inverters is r k +jX k , assuming that the sum of the parallel inverter output impedance and the connection impedance is mainly inductive, that is, X k >>r k ;

[0045] Step 2, take ω k , U kare the angular frequency and amplitude of the output voltage of the k-th group of inverters, ω 0 , U 0 are the angular frequency and amplitude of the output voltage when the microgrid system is no-load, k Pω 、k QU are the droop coefficients of the active power-frequency droop characteristic curve and the reactive power-voltage droop characteristic curve of the system respectively, P k , Q k are the active power and rea...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an improved droop control method in an improved micro electric network detached island operation control system. The automatic adjustment of the droop coefficient and the rated output power at the direct-current side is added in the traditional droop control, so as to reduce the fluctuation in voltage amplitude and frequency due to load change is reduced. In case that k groups of inverters are connected in parallel in the micro electric network, the active power and the reactive power output by the k-th inverter are respectively Pk and Qk. In the traditional droop control, the control equation of the output voltage amplitude of the inverter and the frequency droop is represented in the description: the droop coefficients kP Omega and kQU are replaced by simple functions correlative with the active power and the reactive power, represented in the description: the rated output powers on the direct current side of a drawing-in system are Pn and Qn, the rated output voltage angle frequency and amplitude of the micro electric network system are Omega n and Un, the load power is detected at the real time, the Pn and Qn are automatically adjusted, thus the Pn and Qn gradually reach Pk and Qk in delta T time, at the same time, the system droop control equation is represented in the description: the detached island operation of the micro electric network is controlled using the droop control equation.

Description

technical field [0001] The invention relates to an operation control method of a microgrid, in particular to an improved droop control method in a microgrid island operation control system. Background technique [0002] From a system point of view, the microgrid combines generators, loads, energy storage devices, and control devices to form a single controllable unit that can supply electricity and heat to users at the same time. The microgrid contains multiple distributed generation (DG) and energy storage devices, which jointly supply power to the load. The entire microgrid is externally integrated and connected to the upper-level grid substation through a main isolating switch. The basic structure of a microgrid is figure 1 shown. [0003] The microgrid has two operating modes: grid-connected operation and islanded operation. Since many DGs are connected to the microgrid through inverters, when the microgrid is operating in an island, it is equivalent to multiple invert...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H02J3/12H02J3/46
CPCY02P80/14
Inventor 李可军刘合金孙莹高洪霞
Owner SHANDONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap