The harm of high voltage fault of power grid to the safe and stable operation of new energy sets and power grid is becoming more and more serious. Firstly

this paper introduces the current national high voltage ride through（HVRT）standards and analyzes the typical causes of high voltage faults in the power grid. According to the different causes and degree of fault

the high voltage fault can be divided into two categories. Secondly

the permanent magnet direct driven wind turbine（PMSG）is taken as an example

the transient transition process of PMSG during the high voltage fault is analyzed and the high voltage ride through control strategy is designed. It is shown by the analysis that under the typical parameter design it is difficult for PMSG to pass through the deep high voltage fault caused by DC transmission system blocking.Furthermore

the coordinated control strategy of new energy unit and reactive power compensation device is proposed to realize the ride through of new energy unit under deep high voltage fault. Finally

the analysis results and the effectiveness of the proposed method are verified on the basis of PSCAD/EMTDC electromagnetic transient simulation.