Research And Design Of Multi-limb Split Core Controlled Magnetic Saturation Transfomer

As the continuous development of UHV power grid construction and the smart grid research, stability of power system has become the focus of the grid development and the reactive power balance is the central theme. From the view of the world, renewable energy, especially wind energy, is developing very fast. Wind power in China has doubled every year in recent years. The need of reactive power compensation devices which have greater stability, faster real-time and higher reliability is bad. Therefore reactive power compensation device of magnetically controlled transformer is introduced under the background. It can not only compensate reactive power in time like the magnetic controlled reactors but also be the same as transformers to conduct active power. Therefore, this research is of great importance.The following work is conducted around the magnetic controllable transformer in this paper:Bring up a simple physical model of magnetic controlled transformer based on the split-core magnetic controlled reactor. In fact, the split-core magnetic controlled reactor, also known as the transformer magnetic controlled reactor, the structure is equivalent to the transformer with secondary side open. If the split-core magnetic controlled reactor core had secondary windings, you can get a simple physical model of magnetic controlled transformer.Conduct a detailed mathematical derivation and analysis of the model above. Put forward three possible states of the magnetic transformer, and work out the amplitude of reactive power compensation and harmonic content with the change of the control current.Propose multi-column split-core magnetic controlled transformer model. Analyze the model deriving its advantages in harmonic elimination. And deduce the amplitude of the DC excitation current and DC winding circulation current.Analyze 1600kVA35 kV magnetic controlled transformer numerical example. Referring to the transformer design principles, complete transformer design. Obtain their reactive power compensation and harmonic curves with DC current to prove the feasibility of reactive power compensation. Design 100 kVA, 10 kV multi-limb split core magnetic controllable transformer with the detailed parameters to achieve the prototype transformer manufactured. Calculate the amplitude of DC excitation current and the amplitude of the circulation current to prove that it can be used to achieve reactive power compensation.In this paper, split-core and multi-column split-core controllable magnetic transformers are analyzed to prove magnetic controllable transformer can be used to compensate reactive power with the advantages of a small loss, low harmonic content and wide adjustable range. They have the feasibility used in the actual grid, and therefore will have a wide range of applications in the power system.