Publisher： Trans Tech Publications
E-ISSN： 1662-7482|2015|740|503-506
ISSN： 1660-9336
Source： Applied Mechanics and Materials, Vol.2015, Iss.740, 2015-04, pp. : 503-506
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
For multi_level multi_module in the flexible HVDC converter (MMC) module capacitor control algorithm is commonly based on nearest voltage level modulation (NLM), this algorithm requires the decimal part of the input sine wave for analog-to-digital conversion by digital signal (digital pulse modulation, referred to as DPWM),in the choice of hysteretic DPWM control signal is better, if the input triangle carrier wave frequency selection is not good, in each digital signal level will cause the output frequency of DPWM is not stable, some DPWM frequency is too high, and some DPWM has no output. In order to solve this problem, to meet the requirements of control precision, the carrier frequency change DPWM triangular wave, the output ideal control signal, the output control signal is analyzed, put forward how to carry out DPWM frequency selection. Through the simulation certified the feasibility of this method, the control method of downloading to the field programmable gate array (FPGA) chip, the results of the actual control operation show that this method can optimize the control of flexible HVDC.
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