Modelling, design and control of the virtual synchronous machine in the smart grid application

• Main Author: Chen, Yidan
• Other Authors: Zhang Xin
• Format: Theses and Dissertations
• Language: English
• Published: 2019
• Subjects: DRNTU::Engineering::Electrical and electronic engineering
• Online Access: http://hdl.handle.net/10356/78273
• Institution: Nanyang Technological University

In the past few years, due to the increasing people’s awareness in environmental protection, the renewable energy (distribution) generation plays a larger and larger part in the power grid. The renewable energy generation is environmentally friendly and economic. However, the increasing amount of renewable power resources brings new challenges to the power grid, such as dynamic issues, the lower stability operation, etc. Subsequently, the definition of the smart grid occurred in order to combine the different generation units into a power system. The smart grid has high efficiency and economic advantages. However, because of the stability and dynamic issues caused by the renewable energy generation, virtual synchronous machine is a kind of new technology which has the ability to help the smart grid to interface with the power grid with more stable operation. The virtual synchronous machine has similar characteristics to a traditional synchronous machine, which is able to synchronize itself before connecting to the grid and inject virtual inertia and damping to the power grid. So that it has positive effects in the stable operation of the power grid. This dissertation concentrates on the design and modelling of a synchronverter (which is a kind of virtual synchronous machine), including the control system design and circuit design. The motivation and development of the virtual synchronous machine and the smart grid are introduced. The design of the synchronverter is discussed in chapter 3. In addition, the simulation results of the synchronverter are analysed in chapter 4. According to the simulation result, the synchronverter model has a good performance in active control, reactive power control, frequency-droop control and voltage-drop control.