Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor

A technology of DC side voltage and equalizing capacitors, which is applied in flexible AC transmission systems, reactive power adjustment/elimination/compensation, etc., can solve problems such as limited range, low harmonic frequency, and small phase angle adjustment range, and achieve improved Effects of reliability, cost reduction, and simplification of control procedures and regulator design

Inactive Publication Date: 2012-11-14
XI AN JIAOTONG UNIV
View PDF1 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Changing the pulse width or phase angle makes the CMI output voltage waveform asymmetrical and introduces more harmonics; when the number of power modules is large and the inconsiste...

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
  • Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor
  • Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor
  • Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0050] The structure of chained STATCOM is as follows figure 1 As shown, it is composed of grid, reactive load, connected inductor, and cascaded multilevel inverter (Cascaded Multilevel Inverter, CMI). The CMI consists of N power modules connected in series. The present invention is described with a star connection structure, and the control method of the delta connection can be analogized. The CMI of each phase is connected in parallel to the common connection point (Point of Common Coupling, PCC) of the system after connecting the inductor in series. The power module that constitutes CMI is a complete single-phase inverter, including independent power switch tube, DC side power supply, drive circuit, detection circuit, protection and control circuit, etc. It can be a diode clamping circuit, or a capacitor Type clamping circuit, also can be 3H bridge inverter circ...

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 a chained static compensator (STATCOM) direct-current-side voltage controlling method and a chained STATCOM direct-current-side voltage controlling circuit based on a voltage-sharing capacitor. The chained STATCOM direct-current-side voltage controlling circuit comprises a three-phase star-shaped connection inverter, the voltage-sharing capacitor, n bidirectional switch devices, a sensor and a microprocessor, wherein output voltage of each inversion circuit module of the three-phase inverter is detected by the sensor and is output to the microprocessor; the microprocessor is used for controlling connection/disconnection of the n bidirectional switch devices until direct-current-side capacitor voltage of each phase is balanced. By adding a small-volume auxiliary circuit, energy of each current-side capacitor of a chained STATCOM is renewedly distributed, so that the capacitor voltage keeps stable and balanced, and the key problem that the STATCOM is limited to be used in a high-pressure large-volume occasion is effectively and reliably solved; and therefore, the reliability of a system is greatly improved, and the cost of voltage-sharing control is obviously reduced so as to propel that the chained STATCOM is reliably applied to medium-high pressure high-volume power devices.

Description

Technical field: [0001] The invention belongs to the field of electric energy quality control research, in particular to a DC side voltage control method and a control circuit of a medium-high voltage chained STATCOM. Background technique: [0002] The chained STATCOM has significant advantages such as large number of levels, small harmonic content, small passive components, and good expansion performance; it plays a role in compensating reactive power in the power transmission and distribution system, improving the stability of the system voltage and improving the operating performance of the system It is an effective means to solve power quality problems in the field of high voltage and large capacity, and is one of the core technologies of the Flexible AC Transmission System (FACTS). [0003] The excellent performance of the chained STATCOM and the existing system control strategy are based on the perfect consistency of each power module, which requires that each power mo...

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): H02J3/18
CPCY02E40/16Y02E40/10
Inventor 卓放熊连松
Owner XI AN JIAOTONG 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