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中文摘要：
提出一种适用于风电直接经直流大规模远距离外送的新型换流器，由电压源型换流器和相控换流器串联而成，占整个换流器的容量分别为1／4和3／4，并将此换流器称为混合型换流器（VSC-PLUS）。该换流器综合了相控换流器和电压源型换流器的优点，既具有自换相黑启动功能，又具有高压低损耗特点，使得换流器可直接联接于风电场进行风电的大规模远距离外送。详细介绍了串联混合型换流器的拓扑结构及控制策略，论述了该换流器相比于其他换流器的优势。仿真验证该混合型换流器构成的直流输电系统的稳态运行、黑启动、潮流反转和阻断直流故障电流等能力。结果表明混合型换流器特别适合于大规模风力发电直接经直流输电进行远距离输送，具有较大的工业应用价值。
英文摘要：
This paper proposed a new kind of converters which are suitable for wind power transmission over long distance. The converters are composed of voltage source converters （VSC） and line commutated converters （LCC）, and the capacity of VSC and LCC are about 1/4 and 3/4 of the total capacity respectively, and which is denoted as voltage source converter-PLUS （VSC-PLUS） in this paper. The VSC-PLUS combines the advantages of VSC and LCC, not only has the function of self-commutating and black-start, but also has the characteristics of low loss at high voltage. So the VSC-PLUS can be connected with the wind farm directly to transmit wind power distantly. The topology and control strategy of VSC-PLUS were described. The abilities of VSC-PLUS such as operation in steady state, performing black start, reversing power flow and blocking DC fault current have been validated by simulations in PSCAD/EMTDC. Results show that the VSC-PLUS are especially suitable for transmitting wind power distantly, and have large potential values in industrial applications.
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