A dynamic model for inertia energy stored generator with rectifier system
Due to diode elements, inertia energy stored generator with rectifier system possess the characteristic of nonlinearity, which cause great difficulty in analyzing systematic performance. In this paper, The inertia energy stored generator is modeled based on the fact that subtransient electric motive force (EMF) maintain constant during commutation process, and the uncontrollable rectifier system is also modeled based on state space averaging method. Both of which provide an effective model for systematic analysis.
Simple methods for detecting zero crossing
Affects of noise, harmonics, and multi-frequency signal make frequency and period measurements difficult for synchronizing control events. Various methods are presented to minimize errors in period and phase measurements. Both frequency and amplitude domain approaches are analyzed. Post detection processing allows greater accuracy. Static and dynamic hystereses as well as interpolation methods of zero-crossing detection are investigated.
Dynamic simulation of capacitor-based electric gun systems for naval applications
The dynamic simulation of an electrothermal chemical (ETC) gun system utilizing capacitor-based energy storage and gas turbine prime power is examined. A comparison of system responses for both dedicated and shared prime power source configurations confirms that both modes are feasible. The dynamic analysis/simulation indicates that the pulsed power supply for an ETC gun can be extracted from the ship's propulsion system. Sharing power between shipboard combat and propulsion systems has negligible impact on ship performance at high speeds. Due to a large reserve of kinetic energy in the propulsion system the pulsed load is isolated, to a certain degree, from the gas turbines. The impact of the weapon's system power supply on propulsion performance at low speeds may become significant due to the inertial load encountered in attempting to speed up the generator while connected to the propeller shaft. In these cases, and when the ship is at anchor, the turbine/generator should be declutched from the rest of the main reduction gear for dedicated weapons duty. Once declutched, the power system dynamics should follow the results presented for the dedicated turbine configuration. >