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Cascaded hybrid direct current system and control method

An AC system and control signal technology, applied in the direction of AC network circuit, power transmission AC network, electrical components, etc., can solve the problems of difficult to increase the control scale of control frequency, reactive voltage fluctuation, etc., to improve the power control range and frequency. Stability, the effect of improving frequency stability

Inactive Publication Date: 2020-12-15
STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST +2
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  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems that the conventional LCC DC control frequency easily causes reactive voltage fluctuations, and the ordinary point-to-point VSC DC control frequency is difficult to increase the control scale, and provides a cascaded hybrid DC system and control method

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  • Cascaded hybrid direct current system and control method
  • Cascaded hybrid direct current system and control method

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Embodiment Construction

[0053] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the following The described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0054] A method for suppressing frequency fluctuations of AC systems on the inverter side,

[0055] Obtain the frequency difference of the new energy AC system;

[0056] Perform high-frequency noise signal filtering on the frequency difference to obtain the filtered signal;

[0057] Proportional-integral control is performed on the filt...

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Abstract

The invention discloses a cascaded hybrid direct current system and a control method. The cascaded hybrid direct current system comprises a rectifier side LCC converter station, an inverter side high-end LCC converter station, an inverter side low-end VSC converter station and the inverter side additional controller. The system has the advantages that the frequency fluctuation of the receiving endnew energy system can be suppressed by utilizing the cascaded hybrid direct-current inverter side additional frequency controller, and the frequency stability of the receiving end system is improved;coordination control between VSCs is carried out through constant direct-current voltage control of the VSC1 inverter, constant power control including backup constant direct-current voltage controlof the VSC2 inverter and constant power control of the VSC3 inverter, the power control range can be effectively widened, and the effect of improving the frequency stability of a large-scale new energy access system is achieved.

Description

technical field [0001] The invention relates to a cascade hybrid direct current system and a control method, belonging to the technical field of high voltage direct current transmission hybrid direct current. Background technique [0002] In a typical hybrid HVDC transmission, the receiving-end LCC (conventional HVDC) converter station of the conventional DC at both ends is replaced by a VSC (Voltage Source Converter) converter station to eliminate the commutation failure of the LCC as an inverter station defects, while improving the voltage stability of the receiving end system. In recent years, relevant scholars have proposed receiving-end cascaded hybrid DC transmission technology, that is, expanding the receiving-end VSC to multiple VSCs in parallel and then connecting them in series with high-end LCCs. At the same time, its multi-drop structure is also conducive to the phased construction of the project. Different from the conventional DC system, the Baihetan receivin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36H02J3/38
CPCH02J3/36H02J3/381H02J2003/365H02J2300/28Y02E60/60
Inventor 赵静波廖诗武王大江解兵
Owner STATE GRID JIANGSU ELECTRIC POWER CO ELECTRIC POWER RES INST
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