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.
A survey of the second-generation vessel integrated power system
The vessel integrated power system (IPS) is the third revolution in the naval vessel power which has evolved from wind power to steam power and then from steam power to nuclear power, marking the trend of naval vessel power. The first-generation IPS has been widely applied to engineering in many countries. However, there are some defects in it such as huge volume, heavy weight and low compatibility when the first-generation IPS is used in light ships, because its power density is limited by the properties of the electromagnetic materials, power electronics, etc. This paper has presented the concept and typical architecture of the second-generation IPS and its technical advantages, introduced several key technologies concerning the second-generation IPS that need a breakthrough according to the current technical level, and pointed out direction of the research and engineering application of the second-generation IPS.
USE OF HYBRID OPTIMISATION ALGORITHM FOR ELECTROMAGNETIC PARAMETER ESTIMATION OF A SYNCHRONOUS GENERATOR
Summary. In the paper there are presented the results of electromagnetic parameter estimation in the d axis of a large power, synchronous generator when using different optimisation algorithms. The turbogenerator standard model expressed by reactances and time constants as well as including the phenomenon of core saturation was used in computations which were based on simulated and real dynamic waveforms of the chosen turbogenerator quantities obtained from measurements of the no-load generator steady state disturbed with a step change in the AVR reference value. The problem of determining the parameters of the machine under consideration was formulated in the form of the objective function for minimisation of which there was used a hybrid algorithm consisting of genetic and gradient algorithms. The computations were carried out with use of the Matlab-Simulink package.