Analysis and modeling of novel brushless exciter based on hybrid excitation topology
The exciter is a key component of the synchronous generator system with self-excited initiation. Based on the topology of hybrid excitation, this paper proposes a novel brushless exciter, which is suitable for an isolated power system. The parameters of the exciter are calculated by the numerical method based on finite element model, and the state space model is established. The experimental researches are carried out on a 3 kW prototype.
Research on self-excited initiation of a Medium-voltage DC (MVDC) multiphase synchronous generator-rectifier system
This paper has described the excitation system of a Medium-voltage DC (MVDC) multiphase synchronous generator-rectifier system and calculated the minimum frequency of the pilot-exciter needed for self-excited initiation. On this basis, a double closed-loop V/F control method is proposed according to the classical PI control algorithm for self-excited initiation. With the method, a prototype is constructed for test. The results show that both the self-excitation initiating and the speed-rising processes of the generator set have changed synchronously thus to reduce the time needed for MVDC multiphase synchronous generator-rectifier system to start and finish establishing the nominal DC voltage.
Power and Energy Management in Integrated Power System
Integrated Power System (IPS) makes more intensive use of power electronics and control than the traditional shipboard power system. This paper proposes to develop a high level Power and Energy Management System (PEMS) for a ship incorporated with IPS. PEMS will be integrated in the ship's automation system and will be responsible for the functions like - generator start/stop control, load dependent start/stop, blackout monitoring, load shedding, ship operation mode selection, start sequence program, etc. The PEMS is designed as a two-layer hierarchical architecture viz. system level layer and zonal level layer. A Power CONtrol module (PCON) is developed in both the two layers that will coordinate with other modules in the PEMS to realize its functions. Using PEMS, power and energy can be generated and delivered in an effective manner from generators to consumers. The benefits of this proposed approach are in minimizing the fuel consumption, improving the survivability, assuring the quality of service, etc.