A kind of mmc capacitor voltage balance control method suitable for fpga
A capacitor voltage and balanced control technology, which is applied to electrical components, output power conversion devices, AC power input conversion to DC power output, etc., can solve problems such as large amount of calculation and high switching loss
Active Publication Date: 2020-10-23
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology
On the one hand, the traditional method requires a large amount of calculation for sorting, and on the other hand, small changes in capacitor voltage will also cause repeated switching of sub-modules, resulting in high switching losses
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[0034] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific examples.
[0035] Such as Figure 1a As shown, in this example, the MMC is built on a real-time digital simulator (RTDS), and a single-ended MMC system is used to verify the voltage equalization control method designed in the present invention. The modular multi-level converter MMC (Modular Multi-level Converter) used in this embodiment is a bridge topology, with n sub-modules (SM) connected in series in each of the upper and lower bridge arms, and the upper and lower bridge arms pass through their respective reactance device (L 0 ) is connected to a three-phase AC power supply;
[0036] Such as Figure 1b As shown, the sub-module (SM) consists of two half-bridges (T1, T2) composed of power electronic devices, two anti-parallel diodes (D1, D2) and a DC energy storage capacitor (C), and the two power electronic devices Composed ...
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The invention discloses an MMC (modular multilevel converter) capacitor voltage equalization control method suitable for FPGA (field programmable gate array) in the technical field of power system operation and control. The invention divides several sub-intervals according to the capacitive voltage fluctuation range during normal operation, and matches the sub-modules into corresponding sub-interval groups according to the capacitive voltage collected in real time, and then determines the reading sequence of each group according to the direction of the bridge arm current. At the same time, when grouping sub-modules whose capacitor voltage is near the rated value, the switch state at the previous moment is considered, and the switching frequency of the device is further reduced by following the principle of keeping the original state unchanged as much as possible. The invention has the effect of avoiding the sorting of the capacitor voltages of the sub-modules, realizing fast voltage equalization control and reducing the switching frequency of devices under the premise of ensuring the voltage equalization control effect of the sub-modules.
Description
technical field [0001] The invention belongs to the technical field of power system operation and control, and in particular relates to an MMC capacitor voltage equalization control method suitable for FPGA. Background technique [0002] The modular multilevel converter (MMC) is a new type of voltage source converter (VSC) designed with a modular structure. Due to the MMC sub-module (sub-module, SM) cascaded topology, compared with traditional two-level and three-level topology converters, it has low switching frequency, good output waveform quality, and requirements for switching consistency. With the advantages of low cost and good scalability, it has become a research hotspot in the field of flexible direct current transmission, and has achieved more and more engineering applications. [0003] The DC side voltage of the MMC is supported by the capacitors scattered in each sub-module, and the balance of the capacitor voltage of the sub-modules is an important prerequisite...
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IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/4835
Inventor 孙吉波王宇杨银国刘崇茹钱峰凌博文徐春华包博
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD