DIRECT-CURRENT BUS VOLTAGE REFERENCE VALUE ADJUSTMENT METHOD AND APPARATUS, AND PHOTOVOLTAIC GRID-CONNECTED INVERTER

Title:

DIRECT-CURRENT BUS VOLTAGE REFERENCE VALUE ADJUSTMENT METHOD AND APPARATUS, AND PHOTOVOLTAIC GRID-CONNECTED INVERTER

Document Type and Number:

WIPO Patent Application WO/2019/223785

Kind Code:

A1

Abstract:

Provided are a direct-current bus voltage reference value adjustment method and apparatus, and a photovoltaic grid-connected inverter. The method comprises: determining a bus voltage stabilizing value of a photovoltaic grid-connected inverter according to pres-et parameters, wherein the pre-set parameters at least comprise: a grid interconnection point voltage module value of a power grid and a modulation coefficient of the photovoltaic grid-connected inverter; and when determining that a high voltage fault occurs in a power grid corresponding to the photovoltaic grid-connected inverter, adjusting a direct-current bus voltage reference value of the photovoltaic grid-connected inverter to the bus voltage stabilizing value. Using the above-mentioned technical solution solves the problem in the related art that accuracy and controllability are low in an adjustment strategy where a direct-current bus voltage reference value of a photovoltaic grid-connected inverter is directly increased to a limit value, improving the accuracy and controllability of the adjustment strategy.

Inventors:

TANG HONGYANG (CN)
LI YUAN (CN)
YU SONGSEN (CN)
WEI XUEHAI (CN)
LI JIANGUO (CN)

Application Number:

PCT/CN2019/088354

Publication Date:

November 28, 2019

Filing Date:

May 24, 2019

Export Citation:

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Assignee:

ZTE CORP (CN)

International Classes:

H02J3/38

Foreign References:

CN107069809A	2017-08-18
CN104935006A	2015-09-23

Other References:

ZHENG ZHONG; GENG HUA; YANG GENG: "High Voltage Ride-through Control Strategy of Grid-connected Inverter for Renewable Energy Systems", ZHONGGUO DIANJI GONGCHENG XUEBAO = PROCEEDINGS CHINESE SOCIETY OF ELECTRICAL ENGINEERING, vol. 35, no. 6, 20 March 2015 (2015-03-20), pages 1463 - 1472, XP009524838, ISSN: 0258-8013, DOI: :10.13334/j.0258-8013.pcsee.2015.06.022
See also references of EP 3796507A4

Attorney, Agent or Firm:

KANGXIN PARTNERS, P.C. (CN)

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