Flexible half-wave power transmission system based on power electronic commutation technology and tuning method of system

The invention relates to a flexible half-wave power transmission system based on a power electronic commutation technology and a tuning method of the system. The power transmission system comprises a long-distance power transmission line and a power transmission line flexible tuning device, wherein the flexible tuning device comprises a frequency conversion type flexible tuning device and a synchronous compensating type flexible tuning device; the frequency conversion type flexible tuning device is used for constructing a frequency conversion type half-wave power transmission system by adjusting the power transmission frequency on the basis of a power electronic frequency conversion principle and the synchronous compensating type flexible tuning device is used for constructing a synchronous compensating half-wave power transmission system by adjusting the equivalent electrical distance of the power transmission line on the basis of a synchronous compensating principle of a power electronic inverter. Half-wave power transmission has the advantages of far transmission distance, good voltage stability at first and tail ends, infinitely great theory limit of transmitting power, no reactive compensation devices and intermediate switching stations and the like. The economical benefit of half-wave power transmission is even superior to that of direct-current transmission, and the flexible half-wave power transmission system is particularly suitable for point-to-point, high-capacity and ultra-long distance power transmission and distribution and has strong competitiveness on transcontinental and transnational power transmission and power supply for remote regions.