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The benefit of parallel air conditioning dc control transmission for the improvement of transient and dynamic solidness and clammy out motions have been set up. Present paper proposes a synchronous air conditioning dc power stream plot through a similar transmission line to get the benefits of parallel air conditioning dc transmission to improve security and damping motions just as to control the voltage profile of the line by controlling the complete responsive power stream. Just the essential thought is proposed alongside the plausibility study utilizing rudimentary research center model. The principle item is to underline the likelihood of synchronous air conditioning dc transmission with its inborn preferred position of intensity stream control. Control strategies dependent on particular consonant disposal beat width regulation (PWM) methods with energy unit framework offer the least conceivable number of exchanging advances and improve the voltage level in SAF transmission framework. This element likewise brings about the most reduced conceivable degree of converter exchanging misfortunes. Therefore, they are appealing systems for the voltage-source-converter-(VSC) based high-voltage dc (HVDC) control transmission systems.