UHVDC transmission control method and control device based on calculation voltage value
A UHV DC and voltage calculation technology, applied in the direction of power transmission AC network, etc., can solve the problems of inability to accurately control the valve group voltage, valve group overvoltage protection action blocking, etc.
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[0035] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0036] figure 1 It shows the main circuit of a single converter station in a conventional UHVDC transmission system where the high and low-end valve groups are connected to the same AC grid. One DC pole 10 of the conventional UHV DC transmission is connected to the converter station at the other end through the DC line 6 . The DC pole 10 has two high-end valve groups 8 and low-side valve groups 9 composed of valve groups 4 , which can be bridged by DC switches 5 respectively. The low-end valve group 9 is connected to the ground electrode 11 through the ground electrode line 7 . The valve group 4 is a twelve-pulse three-phase bridge circuit, that is, it includes two six-pulse bridges 4a and 4b connected in series, which are respectively connected to the high-voltage direct current transmission transformer 3 . The HVDC transformer 3 has a ...
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