Abstract
There is no common accepted way for calculating the valve power loss of modular multilevel converter (MMC). Valve power loss estimation based on analytical calculation is inaccurate to address the switching power loss and valve power loss estimation based on detailed electro-magnetic simulation is of low speed. To solve this problem, a method of valve power loss estimation based on the detailed equivalent simulation model of MMC is proposed. Results of valve power loss analysis of 201-level 500MW MMC operating at 50Hz~1000Hz are presented. It is seen that the valve power loss of a MMC increased by 12, 40 and 93 % under 200Hz, 500Hz and 1000Hz operating frequency. The article concludes that in a device with isolated inner AC system, MMC operating at higher frequency will be more competitive than typical 50Hz/60Hz MMC with moderate increase of operating power loss and significant reduction of the size of the AC components.
Highlights
The Modular Multi-Level Converter (MMC) has been making its way for wide application in both medium and high voltage applications
A fast electro-magnetic simulation model of MMC is developed for accurate power loss
The accuracy of power loss calculation is verified by comparison with detailed model of MMC
Summary
The Modular Multi-Level Converter (MMC) has been making its way for wide application in both medium and high voltage applications. The power loss can be reduced to about 1 % per converter station [4]. There are no commonly accepted standards for determining the power loss for MMC. An intuitive way of obtaining the valve power loss valve power losses of a converter station is comparing the measured power at the AC side and the DC side. For MMC, some of the necessary input parameters such as valve currents and switching occasions are difficult to be obtained by purely analytical methods [9]. The additional switching loss caused by voltage balancing control is estimated to its upper limit, which makes power loss evaluation result of [10] conservative
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