The invention discloses a
hybrid power
system and a control method thereof. The
hybrid power
system comprises an engine, a brushless doubly-fed motor and a
frequency conversion device, wherein the engine is connected with a load, and the brushless doubly-fed motor is indirectly connected with the load by connecting the engine in series; the brushless doubly-fed motor is adopted to replace a
permanent magnet motor, and a power winding and a control winding of the brushless doubly-fed motor can perform
frequency conversion and speed regulation at the same time so that the speed regulation range is wider; the super
capacitor and the storage battery are used for supplying power at the same time, and the discharging performance and the
power storage capacity can be guaranteed; when the winding on one side goes wrong, the winding can be opened to control an asynchronous motor, so
system safety is improved; due to existence of the super
capacitor, the power winding is a high-
voltage winding, and circuit loss can be reduced; the brushless doubly-fed motor is a dual-port motor, a control winding and a power winding can be controlled at the same time, control schemes are diversified, and power and cruising ability can be better optimized.