含风电机组的随机生产模拟改进算法

等效电量频率法是针对大多数随机生产模拟忽略负荷的时序性而难以计算系统动态费用的问题而提出的随机生产模拟方法。将等效电量频率法忽略的除本台机组外的其他机组故障影响纳入机组启停次数的计算中,形成了改进的等效电量频率法。该方法在计算负荷频率曲线的时候考虑了应变分量f(i)3(x)的影响,并引起机组开机期望值、系统失负荷概率、缺电成本和启停费用的改变。通过对EPRI 36机组的随机生产模拟结果进行分析和比较,结果表明改进算法对系统可靠性和经济性均有改善。     

光热-光伏联合发电系统无功分层协调优化控制策略研究

针对光热-光伏系统无功补偿现以光热电站与光伏电站独立控制为主,且光热、光伏电站之间缺乏无功协调机制的特点,提出一种适应于光热-光伏联合发电系统的无功分层协调优化控制策略。该控制策略分3层执行:系统层根据系统汇集母线电压确定整个系统所需无功;电站层利用无功分层优化控制模型和基于差分进化的粒子群算法(DE-PSO)对光热、光伏电站分配无功;设备层通过光热、光伏电站内无功源无功分配原则完成站内无功设备的无功分配。算例分析表明:该控制策略能够充分利用同步发电机、光伏逆变器以及无功补偿设备的无功调控能力,实现光热-光伏系统无功补偿任务的优化分配,从而达到提高系统汇集母线电压稳定性和降低系统网损的目的。     

基于随机生产模拟的发电系统储能容量优化配置

在发电系统中配置储能可提高系统的灵活性,缓解高比例可再生能源发电并网给调峰带来的压力.在众多的储能技术中,蓄电池储能备受青睐,世界各国兴建了众多蓄电池储能示范项目以促进其发展.在电源端合理配置储能容量,有助于提高发电系统的经济性.为此,提出基于随机生产模拟的发电系统蓄电池储能容量优化配置模型,该模型以发电系统的综合成本...     

风-光互补发电系统的频率控制研究

针对风、光资源随机性强和负荷多变使风-光互补发电系统频率变化频繁、控制难度增大的问题,分析了混合系统的特点,建立了风-光互补发电系统频率控制的自动机模型,并对发电系统的频率控制进行了仿真实验。结果表明,该自动机模型既能确保风-光互补发电系统频率的稳定,又能使发电系统经济运行。     

Operating maps of a combined hydrogen production and power generation system based on aluminum combustion with water

The performance of a novel hydrogen production and energy conversion system based on the aluminum-water reaction is addressed by means of a lumped and distributed parameter numerical approach. The interest on this type of technology arises because of the possibility of obtaining at the same time different secondary energy sources, such as hydrogen and heat and mechanical work, with very low pollutant and greenhouse gas emissions.In this paper the numerical models of the main components adopted in the system are developed, including the combustion chamber, the steam/hydrogen turbine and the heat exchangers. The behavior of the whole system is investigated for different configurations and energy conversion cycles, i.e. electric energy production only and combined heat and power production, in order to determine the operating maps in terms of efficiency, power output, pressure and temperature in the main sections, mass flow rates and the hydrogen yield. The numerical analysis of the thermo-dynamic behavior of the power unit is aimed at assessing the guidelines that will lead to the construction of a first prototype of this system.Finally, the use of a cogeneration system based on the aluminum combustion with water system for on-site small scale hydrogen production for feeding a hydrogen refueling station is explored. The proposed system is compared with other technologies as well as the case of large scale hydrogen production and delivery.     

PSCAD/EMTDC-based simulation of wind power generation system

This paper proposes a novel simulation method of wind power generation system (WPGS) using PSCAD/EMTDC. The pitch control-based rotation speed control scheme of turbine under variable wind speed is implemented. For the purpose of achieving effective and user-friendly simulation method for utility interactive (grid connected) WPGS, real weather condition-based WPGS simulation (RW–WPGS) is performed using PSCAD/EMTDC. It is not easy, in general, to consider the RW conditions in the WPGS simulation using the EMTP or PSPICE type of simulators. External parameters of the RW conditions, however, are necessary to improve the simulation accuracy.The components modeling of wind turbine system is also studied and the real weather conditions are introduced by the interface method of a non-linear external parameter of the PSCAD/EMTDC. The outcomes of the simulation demonstrate the effectiveness of the proposed simulation scheme.     

Dynamic simulation of a solar-driven carbon dioxide transcritical power system for small scale combined heat and power production

Carbon dioxide is an environmental benign natural working fluid and has been proposed as a working media for a solar-driven power system. In the current work, the dynamic performance of a small scale solar-driven carbon dioxide power system is analyzed by dynamic simulation tool TRNSYS 16 (Klein et al., 2004) and Engineering Equation Solver (EES) (Klein, 2004) using co-solving technique.Both daily performance and yearly performance of the proposed system have been simulated. Different system operating parameters, which will influence the system performance, have been discussed. Under the Swedish climatic condition, the maximum daily power production is about 12 kW h and the maximum monthly power production is about 215 kW h with the proposed system working conditions. Besides the power being produced, the system can also produce about 10 times much thermal energy, which can be used for space heating, domestic hot water supply or driving absorption chillers. The simulation results show that the proposed system is a promising and environmental benign alternative for conventional low-grade heat source utilization system.     

光伏/光热与沼气联合发电系统的设计与仿真

针对常规能源供电系统能耗大,以及太阳能供电系统利用率低、供电可靠性差等问题,文章设计了光伏/光热与沼气联合发电系统,并建立该发电系统的仿真模型,以此来研究太阳辐射强度、环境温度及进水流量对该发电系统性能的影响。研究结果表明:当进水流量在一定范围内时,CPC-PV/T系统的热效率随着进水流量的增加呈先急剧升高而后又逐渐降低的变化趋势,并随着太阳辐射强度的降低而降低,当进水流量为0.012 kg/s时,CPC-PV/T系统的热效率最高;当环境温度为0℃且进水流量较大时,CPC-PV/T系统的热效率为0;光伏/光热与沼气联合发电系统综合发电效率的最大值为21.79%,约为单一CPC-PV/T系统的2倍。     

Stability simulation and parameter optimization of a hybrid wind-diesel power generation system

In this paper a systematic method of choosing the gain parameter of the wind turbine generator pitch control is presented using the Lyapunov technique that guarantees stability. A comprehensive digital computer model of a hybrid wind–diesel power generation system including the diesel and wind power dynamics with a superconducting magnetic energy storage (SMES) unit for stability evaluation is developed. The effect of introducing an SMES unit for improvement of stability and system dynamic response is studied. Analysis of stability has further been explored using an eigenvalue sensitivity technique. The eigenvalues of the system with and without an SMES unit are studied and the effect of variation of the SMES unit parameters on eigenvalue locations are plotted. The dynamic response of the power system to random load changes with optimal gain setting is also presented.     

生物质气化与废弃物焚烧联合发电系统智能优化

从系统能量分配和平衡的角度,简化了生物质气化与废弃物焚烧联合发电系统的数学模型.简要介绍了非线性规划和遗传算法的基本原理,并用这2种算法对该联合循环发电系统的目标函数进行智能寻优.运行结果表明：基于Matlab平台的非线性规划和遗传算法有共同的优点,都可以避免繁重的编程工作.与非线性规划理论相比,遗传算法具有较好的寻优搜索能力和直观性.     

4MW级生物质气化发电示范工程的设计研究

介绍了我国4MW级的生物质气化整体联合循环发电示范工程的设计特点。该工艺中使用了中温静电除尘、焦油裂解装置和显热回收系统，预计投运后，将会使生物质的气化效率提高、可燃气中焦油含量减少以及系统效率得以提高，为我国生物质能的开发与运用开辟了广阔的前景。     

Performance review of a novel combined thermoelectric power generation and water desalination system

A novel combined thermoelectric power generation and water desalination system is described with a system schematic. The proposed system utilises low grade thermal energy to heat thermoelectric generators for power generation and water desalination. A theoretical analysis presents the governing equations to estimate the systems performance characteristics combined with experimental validation. Experimental set-up consists of an electric heat source, thermoelectric modules, heat pipes, a heat sink and an evaporator vessel. Four heat pipes are embedded in a heat spreader block to passively cool the bottom side of the thermoelectric cells. The condenser of these four heat pipes is immersed in a pool of saline water stored in an evaporation vessel which is maintained at sub-atmospheric pressure. The liquid to vapour phase change cooling method achieve low saturation temperature and offers a high heat transfer coefficient for the cooling of the thermoelectric generators. At the same time this method utilises the low temperature heat extracted from the cold side of the thermoelectric generator for water desalination. It was observed that at low saturation temperatures greater heat flux could be supplied to the thermoelectric generators with less heat losses to the atmosphere.