A carrier phase-shift pulse width modulation method and controller, mmc cascaded system
A pulse width modulation and carrier phase shifting technology, applied in the field of power transmission engineering, can solve problems such as increasing the difficulty of MMC design and being unable to suppress MMC at the same time.
Active Publication Date: 2021-11-30
珠海澳大科技研究院 +1
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Problems solved by technology
The existing MMC usually adopts the carrier pulse width modulation (PWM) method, but the traditional carrier pulse width modulation method cannot simultaneously suppress the internal circulating current harmonics of the MMC and the switching sub-high frequency harmonics in the output voltage, and needs to cooperate with Add a cooling device to reduce heat loss, or add an output voltage filter device to reduce the impact of output voltage harmonics, thus increasing the difficulty of MMC design
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[0050] Embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary, and are only for explaining the present application, and should not be construed as limiting the present application.
[0051] In the description of the present application, several means one or more, and multiple means two or more. Greater than, less than, exceeding, etc. are understood as not including the original number, and above, below, within, etc. are understood as including the original number. If the description of the first and second is only for the purpose of distinguishing the technical features, it cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technica...
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A carrier phase-shifting pulse width modulation method, a controller, and an MMC cascade system can simultaneously suppress internal circulating current harmonics and output voltage harmonics. The method is applied to the topology of two MMC bridge arms, each MMC bridge arm includes two half bridge arms, and each half bridge arm includes a plurality of sequentially connected sub-modules, the method includes: according to the corresponding The parity of the number of sub-modules determines the inter-phase carrier phase difference that meets the harmonic suppression conditions of the output voltage and the half-bridge arm carrier phase difference that meets the internal circulating current harmonic suppression conditions. The inter-phase carrier phase difference is used to indicate the correspondence between different MMC bridge arms The carrier phase difference of the half-bridge arm is used to represent the corresponding carrier phase difference between different half-bridge arms on the same MMC bridge arm. Afterwards, according to the carrier phase difference between the phases and the half-bridge arm carrier phase difference, the initial phase of the carrier corresponding to each sub-module is determined, so as to generate the carrier signal of each sub-module and control the operation of each sub-module, thereby driving the output voltage of each MMC bridge arm.
Description
technical field [0001] This application relates to the technical field of power transmission engineering, in particular to a carrier phase-shift pulse width modulation method, a controller, and an MMC cascade system. Background technique [0002] Modular multilevel converter (MMC) has the characteristics of easy expansion, high reliability, good high-voltage access and flexible structure, and has been widely used in high-voltage DC transmission, flexible multi-terminal network, and DC distribution network. And ship power supply micro-grid and other fields. The existing MMC usually adopts the carrier pulse width modulation (PWM) method, but the traditional carrier pulse width modulation method cannot simultaneously suppress the internal circulating current harmonics of the MMC and the switching sub-high frequency harmonics in the output voltage, and needs to cooperate with Adding a cooling device to reduce heat loss, or adding an output voltage filter device to reduce the im...
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IPC IPC(8): H02M1/088H02M7/483
CPCH02M1/088H02M7/483
Inventor 刘力戴宁怡
Owner 珠海澳大科技研究院