Power lawn and garden equipment is used to maintain a healthy lawn. Proper mowing, irrigating, and fertilizing result in a healthy, dense, and high-quality lawn.

Machine tools are used to cut and shape metals and nonmetallic materials based on the specifications of a product. The tools, which aid in the manufacturing of critical components, include metal-cutting machine tools, metal-forming machine tools, and machine tools accessories.

Compressors convert mechanical energy into pneumatic energy through compression. Pistons, vanes, and other mechanisms are used to compress air and gas, by increasing the pressure from initially lower pressure to higher pressure. Both compressed air and compressed gas are used for various purposes in the manufacturing, petroleum, chemical, power, mining, food and beverage, pharmaceutical, and medical industries. Compressors can be categorized into several types based on functionality and design. However, the major types of compressors are PD and centrifugal gas compressors.

One of the major achievements in the field of technology and engineering is the invention of motors or, more precisely, electric motors.

A power boiler is a closed vessel that uses different types of fuels to generate steam, which is then used to generate electricity. The machine includes a heat source (furnace) and a heat transfer medium (pipes or tubes for heat exchange) that allow the heating of water to generate steam. Many vendors offer superior-quality and customized fuel-specific boilers designed to boost operational efficiencies in the power generation industry.

A motor is a machine that converts electrical energy into usable mechanical energy. Motors are used in various applications such as industrial pumps, machine tools, power tools, and household appliances.

利用沉降炉实验系统对沈阳市北部污水处理厂污水污泥和铁法烟煤配制成污泥掺混比例为20%的混合燃料,在815~1 200℃下开展炉内结渣特性实验,观察炉内石英挂件的结渣情况,利用扫描电子显微镜(SEM)和X-射线衍射仪(XRD)分析混烧灰的表面微观形态及灰渣中矿物质组成。结果表明,泥/煤掺烧比例为20%,炉内温度达到1 100℃时,会引起轻微结渣,达到1 200℃时,会引起严重结渣。低温灰中的矿物以石英、长石类矿物和磷酸盐矿物为主,灰中长石类矿物和磷酸盐矿物在1 000~1 200℃发生转变形成熔融相,转移至玻璃相无定形物中,促进了颗粒间的烧结。

城市电网结构坚强性可以描述为城市电网承受各种扰动而保持系统稳定的能力,属于广义电力系统安全性范畴。该文在分析结构坚强性评估与现有电网安全性评估方法异同的基础上,提出一套全新的电网结构坚强性评价指标体系。该体系统筹考虑电网结构的宏微观特性,涵盖拓扑结构量和运行状态量两大指标簇,并运用标准离差率对指标分布均匀性进行分析,实现对整个城市电网结构坚强性的综合评估。通过华东某地区城市电网算例分析表明,提出的指标体系合理有效,为城市电网安全性评估提供一个新的角度。

天然气分布式热电联产系统突破了传统集中式供能系统的效率导向型节能模式,形成了与需求侧强耦合的效果导向型模式。基于分布式热电联产系统的节能机理,以供需两侧电力、热力的动态平衡为立足点,针对“以热定电”和“以电定热”2种通用运行模式及其在不同热电比条件下所处5种可能运行状态,提出了分布式热电联产系统相对于不同参照系统节能率的理论表达式。定性和定量分析表明，参照系统的选择对评估热电联产系统的节能收益至关重要。在热电均衡点，联产系统获得最佳节能收益；然而一旦偏离均衡点，则其节能收益与所处运行状态密切相关。此外，系统原动机类型、所处季节工况亦会影响其节能收益。

将下垂控制应用于逆变器电压型并网控制系统中，可以实现逆变器在孤岛和并网两种运行模式间无缝切换。针对低压电力线的阻抗特点，提出新型光伏逆变器电压型并网控制策略。在阻性下垂控制的基础上增加功率环和直流母线电压环，解决电压控制型逆变器并网功率易受电网波动影响等问题，增强了光伏逆变器对功率的控制能力，满足始终以最大有功功率并网和维持直流母线电压稳定的要求。实验结果验证了所提控制方法的有效性。

Because of its minor environmental impact, electricity generation using wind power is getting remarkable. The further growth of the wind industry depends on technological solutions to the challenges in production and construction of the turbines. Wind turbine tower vibrations, which limit power generation efficiency and cause fatigue problems with high maintenance costs, count as one of the main structural difficulties in the wind energy sector. To mitigate tower vibrations auxiliary measures are necessary. The effectiveness of tuned mass damper is verified by means of a numeric study on a 5 MW onshore reference wind turbine. Hereby, also seismic-induced vibrations and soil-structure interaction are considered. Acquired results show that tuned mass damper can effectively reduce resonant tower vibrations and improve the fatigue life of wind turbines. This chapter is also concerned with tuned liquid column damper and a semiactive application of it. Due to its geometric versatility and low prime costs, tuned liquid column dampers are a good alternative to other damping measures, in particular for slender structures like wind turbines.

Much more efforts have been made on the integration of renewable energies into the grid in order to meet the imperative demand of a clean and reliable electricity generation. In this case, the grid stability and robustness may be violated due to the intermittency and interaction of the solar and wind renewables. Thus, in this chapter, advanced control strategies, which can enable the power conversion efficiently and reliably, for both photovoltaic (PV) and wind turbines power systems are addressed in order to enhance the integration of those technologies. Related grid demands have been presented firstly, where much more attention has been paid on specific requirements, like Low Voltage Ride-Through (LVRT) and reactive power injection capability. To perform the functions of those systems, advanced control strategies are presented with much more emphasis on the LVRT operation with reactive power injection for both single-phase and three-phase systems. Other control strategies like constant power generation control for PV systems to further increase the penetration level, and the improvements of LVRT performance for a doubly fed induction generator based wind turbine system by means of hardware protection solutions are also discussed in this chapter.