Air pollution, the destruction of the ecological environment and other issues caused by traditional energy generation become increasingly serious, wind power and other renewable energy technologies will be important means to solve these problems. The global wind energy market is under fast development which is worth $130 billion in 2013 and $165.5 billion in 2014. Therefore, many issues related to wind farm grid interconnection become the focus of the study, among which reactive power control of wind farm is observed and proposed by many researchers. The principal function of the WF reactive power control is following the reactive power set points at the PCC. There are many reactive power allocation principles of WTGs, such as even distribution, proportion distribution and so on. However, reactive power allocation scheme not only affects system loss but has a big influence on voltage profile of WTGs. Voltage profiles of WTG buses are mainly dependent on the P and Q of each WTG, thus steady state voltage profiles of WTGs can be improved by better reactive allocation which can reduce the number of switching operations of OLTC and/or shunt capacitor/reactors. According to my study, it is also shown that power loss can be reduced by appropriate reactive power distribution between WTs, but the effect of reactive power allocation is small. In this paper, a new reactive power allocation scheme of wind turbines is proposed in accordance with above-mentioned objectives. In addition, a comprehensive modelling of wind farm and detailed power flow analysis is presented. Comparison between the conventional even distribution principle and proposed allocation scheme is analyzed. Moreover, a better allocation scheme to solve the increased loss induced by initial proposition is also discussed with comparison. According to simulation result, it is shown that the voltage profile of WTGs can be improved. As a result, the number of on load tap changes (OLTC) is decreased with proposed reactive power allocation scheme of WTGs. Finally, a new reactive power allocation scheme of WTGs is proposed which gives attention to both system loss and voltage profile improvement.