Abstract
When the modular multi-level converter of the sub-module faults, which will cause the unbalanced system, affect the normal operation of the system, so to the MMC arm configuration redundant sub-module is necessary, if the sub-module faults, redundant sub-modules will replace the fault sub-module maintaining the normal operation of system. In this paper, we propose a reasonable and effective method for the configuration optimization of redundant sub-module based on the three indexes, namely, efficient utilization of redundant sub-module, the number of redundant sub-module and the reliability of the system MMC, considering the three factors, establishing a multi-objective optimization function of redundant configuration, By calculating the optimal value to accurately calculate the number of redundant sub-module of MMC, based on the proposed redundancy configuration optimization method, building a simulation model of MMC 5 level in PSCAD, the results verify the rationality and feasibility of the proposed optimization method.
Highlights
In recent years, in the field of flexible high voltage direct current(HVDC), according to the topology research of modular multilevel converter(MMC) has been widely concerned, modular multilevel converter has the advantages of with low harmonic content, low loss, without a lot of insulated gate bipolar transistor(IGBT) [1,2,3]
The fault of sub module (SM) is a common fault of MMC, in order to avoid affecting the normal operation of the system, the current protection strategy is commonly used for fault sub module and lock bypass[5,6,7,8], The usual practice is to add redundant submodules to the bridge arm and replace the fault sub module with redundant submodules to ensure the security and reliability of the system operation
According to the fault tolerant operation module of the fault, At present, there are two main kinds of redundant submodules, hot standby and cold standby [9], cold standby,when the normal work of the system, the redundant sub module is bypassed, does not participate in the work, When the bridge arm module fails, the fault module is locked, and the redundant sub module is put into operation
Summary
In the field of flexible high voltage direct current(HVDC), according to the topology research of modular multilevel converter(MMC) has been widely concerned, modular multilevel converter has the advantages of with low harmonic content, low loss, without a lot of insulated gate bipolar transistor(IGBT) [1,2,3]. The fault of sub module (SM) is a common fault of MMC, in order to avoid affecting the normal operation of the system, the current protection strategy is commonly used for fault sub module and lock bypass[5,6,7,8], The usual practice is to add redundant submodules to the bridge arm and replace the fault sub module with redundant submodules to ensure the security and reliability of the system operation. The redundant sub modules may involve the problem of low utilization rate; the less configuration, the lower the cost, but the reliability of the system will be reduced [9]. On the premise of guaranteeing the reliability of the system, the scheme can reasonably configure the number of redundant submodules[10]
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