船舶单轴并联式气电混合动力系统节能评价

为了提高船舶动力系统能效,同时弥补天然气发动机作为船舶主机时动态特性差、低负荷性能差等问题,本文提出了船舶单轴并联式气电混合动力系统方案。采用模块化建模的方法建立系统的Simulink仿真模型,以周期性作业船舶运行循环为例计算蓄电池储能效率,而后研究系统在E3循环、不同混合度下的单位时间系统能耗以及节能率变化规律,得出节能率脉谱图,并对系统的实际节能率进行加权评价。结果表明:系统在不同混合度、不同负荷下的节能率都为正值,在混合度为0.3~0.5、负荷小于40%时,平均节能率大于15%。本文的研究结果可为船舶单轴并联式气电混合动力系统的设计选型、匹配优化以及能量管理策略设计等提供理论依据。

船舶并联式气电混合动力系统能量效率分析

为提高船舶系统能效,提出一种船舶并联式气电混合动力系统方案,在Simulink平台上建立系统的仿真模型。结合实例对蓄电池的储能效率进行分析,得到该系统在E3循环、不同功率比下天然气发动机的燃气消耗和电动机的效率,从部件效率、总能量效率和总能量效率提升率3个方面对系统能量效率进行研究。结果表明,该系统在转速100%、功率100%和转速91%、功率75%工况下机械推进模式能量效率高,在转速80%、功率50%工况下电力推进模式能量效率高,在转速63%、功率25%工况下大功率比并联推进模式和电力推进模式能量效率高。

海格公交客车混联式气电混合动力系统

介绍玉柴YC6J210N-40 CNG发动机的工作原理、燃料供给系统、点火系统和发动机电控系统;阐述海格公交客车混联式混合动力系统的组成和工作模式。

并联式船舶气电混合动力系统动态加速性能仿真

为提高并联式船舶气电混合动力系统的动态加速性能,设计新的变频器控制策略,充分利用电机的快速响应性。仿真结果表明,采用新的变频器控制策略使电机更早地投入加速过程,从而降低气体主机在加速过程中的功率负荷,有效提升系统的动态响应性能。应用变频器切换控制策略的气电混合动力系统较纯气体机动力系统在加速过程中有着更好的动态性能,主机加速到额定转速的时间最多可缩短32.81%,热力负荷可降低4.28%。

Modern Electrical Power Source on New System of Dissipation and Renewable Energies Sources

This paper presents some solutions of modem renewable energy system applied actually in dissipation energy source： wind turbine, solar panel battery charge, SSS （support set system）, and standby diesel generator cooperated in series, parallel and hybrid system with main energy system. Its solution enable obtain independent individual energy source in different work exploitations. One of problems concerned with alternative energy source is changes of output voltages and output power dependence of climatic conditions. Possible solution is application of decoupled adjustable speed generation system in renewable energy generation. The decoupled generation system consists of： alternative energy source, internal combustion engine drives permanent magnet generator and DC/AC, or AC/AC converter. Performance of single decoupled generation set is discussed supported by results of laboratory tests. To provide high quality voltage is applied an additional energy storage, made from super capacitor and bidirectional DC/DC convert. Such system performs very stiff voltage in any load condition. Integration of solar battery panels or renewable wind energy system is provided via DC link of the variable speed decoupled autonomous generation system. Results of computer simulation and laboratory experiments are presented in the paper.

Potentialities of Renewable Energy in Victoria, Australia

In utility power system, electricity demand is being covered largely by fossil fueled power generation, which contributes high level of GHG （greenhouse gas） emission and causes global warming worldwide. In order to reduce GHG emission level, most of the countries in the world targeting towards green energy that is power generation from RE （renewable energy） sources. In this paper, it is considered to study prospects of RE sources in particular, solar and wind in Victoria State which are abundant as compared to other sources of renewable. The wind and solar energy feasibility study and sensitivity analysis has been done for Victoria with the aid of HOMER （hybrid optimization model of electric renewable） simulation software. From the study, it has clearly evicted that wind energy combinational HPS （hybrid power system） has more contribution, and high potential than solar PV （photovoltaic） systems for a particular location. This study also investigates the influences of energy storage in the proposed HPS.