At present, most of the new energy vehicles on the market have single motor and rear wheel drive. However, a lot power is required when driving at a high speed, a car with dual-motor and four-wheel-drive (FWD) can use dual-motor combined drive so that the two motors can both operate at the high-performance range to meet the power demand of the vehicle. Real-time switch of single-motor and dual-motor mode can make dual-motor FWD vehicles accommodate power performance and economical efficiency.

Switching power supply is a power supply using modern power electronics technology for time ratio control of the switching tube at on and off status. A switching power supply is usually composed of a pulse width modulation (PWM) controlled integrated circuit (IC) and metal-oxide-semiconductor field-effect transistor (MOSFET). With the development and innovation of power electronics technology, switching power supply techniques also keep innovating. Switching power supply is widely used in almost all electronic equipment for its small size, light weight, high efficiency and other properties. It is an indispensable power supply to support the fast development of modern electronic information industry.

Today, countries around the world are vigorously building a new type of power system with a primary focus on renewable energy. The most prominent feature of this new power system is the dominant role played by sources like photovoltaic and wind energy within the power structure. The grid is evolving into a layout consisting of “large grid + active distribution grid + microgrid” to optimize the utilization of alternative energies and balance the grid load, giving rise to the mainstream power system known as “Photovoltaic + Energy Storage”. Energy storage systems have the capacity to significantly alleviate the instability of renewable energy power generation. They can swiftly provide the grid with energy buffering, thereby maintaining stable voltage and frequency within the grid.

In recent years, with new energy power generation gaining popularity and thriving, DC converter has become an integral and important part of new energy power generation system. Its conversion efficiency has been closely watched by enterprises and users. Establishing a proper DC converter measurement and efficiency assessment method can help companies understand the energy consumption of DC converter, provide evidence for customers to choose energy-efficient DC converter and offer technical support for enterprises and users monitoring the efficiency of DC converter.

The LVRT function, in simple terms, refers to the ability of a small-scale power generation system to withstand a certain predefined limit of grid low voltage for a specified period without shutting down

In the field of photovoltaic power generation, inverters are generally categorized into two types: grid-connected inverters and off-grid inverters. The primary characteristic of grid-connected inverters is their higher power capacity and relatively lower cost. They enable precise control of electric energy and do not require energy storage. DC electricity generated by photovoltaic systems is converted by grid-connected inverters and then directly fed into the public electrical grid. This ensures that the AC electricity is fully synchronized with the public grid, meeting the required frequency and phase characteristics of AC power.

As the interface between the generator and the grid, the wind power converter is the core equipment in the wind turbine, and serves as one of the factors that determine the unit’s electrical performance, conversion efficiency and reliability, thus constituting the key and core of the whole wind power generation system. With the increasing capacity of wind turbines, wind power converter of larger capacity will be the future trend. Due to the drastic fluctuation of wind power, the electric and thermal stresses of the wind power converter will change dramatically, threatening the safety and reliability of the converter and interrupting the safe operation of the electrical equipment. As grid-connected wind turbine systems have been increasing, the wind power converter should improve its adaptability to the grid and its handling capability for grid failures so it can meet the grid power quality requirements. Therefore, it is necessary to develop a series of complete and rigorous testing solutions for wind power converters to ensure that their electrical performance, conversion efficiency and stability meet the requirements.

Transformer plays an important role in power, electric, information and communication technology for large-scale distributed renewable energy power generation system. It is a sensor used in distributed and centralized renewable energy system.