Power Decoupling Control Method for Modular Multilevel Converter Based on Disturbance Estimation
A modular multi-level, power decoupling technology, applied in the field of power decoupling control of modular multi-level converters based on disturbance estimation, to achieve good effect, strong application value, and simple calculation
Active Publication Date: 2021-05-25
SOUTH CHINA UNIV OF TECH +2
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Problems solved by technology
[0004] The present invention overcomes the problem in the prior art that true power decoupling control cannot be realized by establishing an analytical model due to the nonlinearity and complex coupling of MMC, adopts the disturbance observer theory, does not require an accurate mathematical model, and will not be modeled Various disturbances such as internal disturbances caused by dynamic and parameter changes, and external disturbances are unified for centralized estimation, and then canceled based on the estimated disturbance values to achieve power decoupling. A modular multi-level converter based on disturbance estimation is proposed. Power decoupling control method for inverter
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Embodiment 1
[0044] The flowchart of a power decoupling control method for modular multilevel converters based on disturbance estimation is shown in figure 1As shown, the method includes the following steps:
[0045] S1, design a second-order disturbance observer based on the dynamic equation of the bridge arm current differential mode component;
[0046] S2, estimating the disturbance amount in real time according to the second-order disturbance observer;
[0047] S3. Implement cancellation according to the estimated disturbance amount, so as to control power decoupling on the AC side of the modular multilevel converter.
[0048] The pushing process and principle of this method are given below:
[0049] figure 2 A schematic diagram of the topology of a three-phase modular multilevel converter is shown. Each phase of the converter is composed of upper and lower bridge arm power units (Power Unit, PU), and the upper bridge arm (or lower bridge arm) PU is composed of 25 half-bridge sub-...
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The present invention relates to the field of flexible direct current transmission, in particular to a method for power decoupling control of modular multilevel converters based on disturbance estimation. S2, estimate the disturbance in real time according to the second-order disturbance observer; S3, realize the cancellation according to the estimated disturbance, so as to control the AC side power decoupling of the modular multilevel converter. This method does not require an accurate mathematical model, is simple to implement, has good effect, strong robustness, and has strong application value.
Description
technical field [0001] The invention relates to the field of flexible direct current transmission, in particular to a power decoupling control method for modular multilevel converters based on disturbance estimation. Background technique [0002] Flexible DC transmission based on modular multilevel converter (MMC) has become the main development direction of flexible DC transmission technology. By using sub-module cascading, MMC does not rely on devices to be directly connected in series, and has the advantages of low switching frequency, low switching loss, good waveform quality, and easy expansion. The sub-module topology is divided into half-bridge circuit, full-bridge circuit, double-clamp circuit, three-level circuit, etc. While the full-bridge and double-clamp circuits have DC fault self-cleaning capabilities, the half-bridge circuit has become the mainstream topology due to its simple control and low cost. [0003] As the key equipment of the flexible direct current...
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IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/53871
Inventor 冯文希张先勇黄耀宏罗飞
Owner SOUTH CHINA UNIV OF TECH