The objective of this study is to investigate the effects of key factors on the powertrain loading dynamic characteristics and fatigue damage. First, the engine and the transmission output shaft torque of a multi-axle vehicle powertrain system were measured by proving grounds (PG) testing and analyzed with a conclusion that the powertrain loading changes were mainly related to three key factors: the mean engine torque, the harmonic engine torque, and the vibration properties of the system. Subsequently, a dynamic model considering the three factors was built and validated by the test data. Finally, fatigue damage of shaft parts and gear parts were calculated to investigate the influence degrees of the three factors. The results show that, the harmonic engine torque and the vibration properties of the powertrain system have a great influence on the fatigue damage of shaft parts, and the mean engine torque is the main factor causing the fatigue damage of gear parts.

The widespread use of large-scale new energy sources and flexible controllable loads has caused randomness on both sides of the power system. which challenges the traditional coordinated control method. Therefore, this paper analyzes the characteristics of bilateral randomness of new energy power system, and proposes a coordinated control strategy of new energy power system considering demand-side response. The strategy takes the maximum wind power consumption as the target in advance control, and based on the day-ahead wind power forecast and the day-ahead load forecast curve, the starting and stopping and output plans of conventional generating units are formulated. Demand side control is mainly to stabilize the active power fluctuation caused by wind power and load, and to coordinate control of demand side load according to priority. Finally, the feasibility and effectiveness of the control strategy are verified by an example simulation.