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A flexible direct current transmission active power open-loop control method and system

A technology of open-loop control and high-voltage DC transmission, which is applied in the field of electric power to achieve obvious economic benefits, improve the stability of small signals, and ensure the effect of control accuracy

Active Publication Date: 2022-03-04
CHINA ELECTRIC POWER RES INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technology of the present invention proposes a voltage source converter type high voltage direct current transmission active power open-loop control method and system to solve the problem of how to perform active power open loop control on a voltage source converter type high voltage direct current transmission under a weak grid

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  • A flexible direct current transmission active power open-loop control method and system
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  • A flexible direct current transmission active power open-loop control method and system

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Embodiment Construction

[0036] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0037] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a voltage source converter type high-voltage direct current transmission active power open-loop control method and system, wherein the method includes: the active power is realized through open-loop control, and the calculation formula for the reference current of the active power open-loop control is: where, is the active power The power reference value is the AC voltage reference value, which is the reference value of the d-axis component of the converter output current; the AC voltage control is realized through a closed loop, and the calculation formula for the reference current of the AC voltage closed-loop control is: where, is the converter output current q-axis The reference value of the component, G AC is the outer loop AC voltage controller, U s is the PCC bus voltage.

Description

technical field [0001] The present invention relates to the field of electric power technology, and more specifically, to an active power open-loop control method and system for flexible direct current transmission. Background technique [0002] Voltage Source Converter based HVDC (Voltage Source Converter based HVDC, VSC-HVDC), especially Modular Multilevel Converter based HVDC (MMC-HVDC), with its technology Advantages have broad application prospects in engineering fields such as new energy grid-connected consumption, island power supply, and weak AC power grid interconnection. Although VSC-HVDC has the ability to connect to weak AC grids, there are still large and small signal stability risks under weak AC grid conditions, which brings new challenges to the safe and stable operation of power systems. [0003] The interaction between the phase-locked loop (Phase Locked Loop, PLL) and the outer loop control in the classic double closed-loop control under the weak grid aff...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02J3/38H02M7/00
CPCH02J3/36H02J3/381H02M7/00Y02E60/60
Inventor 吴广禄王姗姗赵兵李英彪王铁柱杜晓磊
Owner CHINA ELECTRIC POWER RES INST
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