Study on a New Type of HVDC Flexible Digital Pulse Width Modulated Carrier Frequency Selection

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.

• Periodical: Applied Mechanics and Materials (Volume 740)
• Pages: 503-506
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.740.503
• Online since: March 2015
• Authors: Qing Liang Qin*
• Keywords: DPWM, FPGA, HVDC, MMC, NLM, Triangular Carrier Wave

References

[1] Andersen B R. Wind farms interconnections[C]/International Conference on Power System Technology. Chongqing, China: IEEE, (2006).

[2] Hyttinen M, Lamell J O, Nestli T F. New application of voltage source converter (VSC) HVDC to be installed on the gas platform troll a[C]/CIGRE Session. Pairs: CIGRE, (2004).

[3] Larsson T, Edris A, Kidd D, et af. Eagle pass hack-to-back tie: a dual purpose application of voltage source converter technology[C]/IEEE Power Engineering Society Summer Meeting. Vancouver, Canada: IEEE, 2001: 1686-1691.

DOI: 10.1109/pess.2001.970329

[4] Flourentzou N, Agelidis V G, Demetriades G D. VSC-based HVDC power transmission systems: an overview[J]. IEEE Trans on Power Electronics, 2009, 24(3): 592-602.

DOI: 10.1109/tpel.2008.2008441

[5] Ronström L, Hoffstein M L, Pajo R, et al. The Estlink HVDC light transmission system[C] /CIGRÉ Regional Meeting. Tallinn, Estonia: CIGRE, (2007).

[6] Guibin Zhang, Zheng Xu, Guangzhu Wang. Steady-state model and its nonlinear control of VSC-HVDC system[J]. Proceedings of the CSEE, 2002, 22(1): 17-22(In Chinese).