Control method of alternating voltage sensorless high voltage direct current transmission converter

A technology of high-voltage DC transmission and AC voltage, which is applied to the AC network to reduce harmonics/ripples, instruments, and reactive power compensation. It can solve problems such as slow transient response, affecting control effects, and difficult parameter adjustments. Improving dynamic response speed, avoiding zero-crossing offset, and simplifying the debugging process

CN101882799AInactive Publication Date: 2010-11-10SHANGHAI JIAO TONG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2010-11-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a control method of an alternating voltage sensorless high voltage direct current transmission converter, belonging to the technical field of electrical equipment and comprising the following steps: establishing a stator resistor and an inductor for a virtual motor; building relative position relationships among a current vector, a voltage vector and a flux linkage vector, and analyzing a vectorgram; establishing a converter and flux linkage mathematic model, and calculating a virtual flux linkage vector of a system to obtain a power feedback quantity of the system; acquiring an active control signal and a reactive control signal of the system through a direct power control algorithm, and generating a PWM trigger converter for respectively and independently controlling the active power and reactive power of the system; and utilizing MATLAB simulation software to set up a system model for verifying, and obtaining a systematic selection device when the verification is successful. By utilizing Matlab / Simulink to set up a corresponding simulation model, the designed method is verified to have rapid response speed, the voltage and power after startup can still reach stable values after about 2 power frequency periods and have high steady state precision.
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Description

technical field

[0001] The invention relates to a control method in the field of electrical technology, in particular to a control method for a high voltage direct current transmission (VSC-HVDC) converter without an AC voltage sensor. Background technique

[0002] The utilization and research of various renewable energy sources such as wind energy have been paid more and more attention by major developed countries in the world, and the utilization of wind energy has become one of the effective means to solve the current energy crisis and environmental sustainable development. Offshore wind energy resources are abundant and will be an important way of wind power generation in the future. Offshore wind power long-distance DC transmission has become one of the key technologies in the development of new energy. In recent years, fully controlled devices such as IGBTs have been used more and more in new VSC-HVDC. Although the traditional DC transmission technology is relatively...

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Embodiment Construction

[0026] Embodiments of the present invention are described in detail below in conjunction with the accompanying drawings: the following embodiments are implemented on the premise of the technical solutions of the present invention, and detailed implementation methods and processes are provided, but the protection scope of the present invention is not limited to the following implementations example.

[0027] likefigure 1 As shown, the dotted line in the figure is the equivalent motor, and the concept of virtual flux linkage is derived from the hypothetical virtual motor. It is considered that the line voltage u ab , u bc , u ca It is induced by the virtual flux linkage. For a two-level converter, according to the voltage equation of the AC side of the converter ( are the grid line voltage vector, the AC side voltage vector of the converter and the voltage vector on the inductance L), by detecting the DC voltage and the switching function S i (i=a, b, c) can get the virtua...