Power factor control and soft-start of a grid connected induction machine using floating bridge inverter

使用浮桥逆变器的并网感应电机的功率因数控制和软启动

• 批准号: 453556-2013
• 负责人: Salmon, John
• 金额: $ 9.11万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Idea to Innovation
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=541566
• 关键词: Power; factor; control; soft; start

This Project will investigate technology that was the subject of a preliminary US patent application, submitted 14th January 2013, financially supported by TEC Edmonton and entitled "Grid-connected induction machine with controllable power factor". Motor driven systems consume 44%-46% of global electrical energy generation, with induction machines being the prime means for consuming electrical power in many industrial applications, such as pumps, compressors and fan loads. These machines draw more current than is needed for the loads that they supply. This excessive current is known as reactive current, hence reactive power, and monitored by the performance known as power factor: unity being ideal and less than unity and lagging being less than ideal. Induction machines are known to be a significant contributor of lagging power factor for any given power system. The idea of a grid-connected induction machine operating at unity power factor is considered very desirable, and even leading power factor is desired as such a machine would compensate for the lagging power factor of other machines connected to the grid. This would alleviate many problems experienced in industrial plants and improve the efficient transmission and distribution of electrical power. In the approach developed by the applicants, a commercial three-phase induction machine with a cage rotor has been operated at a leading power factor. Unlike previous attempts that use a means of current injection, a simple power electronic converter uses a voltage injection technique to enable phase shifting of the machine current relative to the grid. This voltage injection is achieved using low cost power electronics with fewer components when compared with other technologies presently being used. The new technology also alleviates a second significant technical problem associated with induction machines, reduced voltage starting to reduce starting currents and hence reduce voltage disturbances of the utility grid voltage. This dual function makes the technology more commercially viable. Preliminary experimental results have proven that the technology works as predicted and this program will take the next step in proving the commercial viability of the new technology.

该项目将研究2013年1月14日提交的美国初步专利申请的主题技术，该专利申请由TEC埃德蒙顿资助，标题为“具有可控功率因数的并网感应电机”。电机驱动系统消耗全球发电量的44%-46%，其中感应电机是许多工业应用中消耗电力的主要手段，例如泵，压缩机和风扇负载。这些机器消耗的电流比它们提供的负载所需的电流要多。这种过大的电流称为无功电流，因此称为无功功率，并通过称为功率因数的性能进行监控：单位是理想的，小于单位，滞后是不理想的。众所周知，感应电机是任何给定电力系统的滞后功率因数的重要贡献者。以单位功率因数运行的并网感应电机的想法被认为是非常理想的，并且甚至期望超前功率因数，因为这样的电机将补偿连接到电网的其他电机的滞后功率因数。这将缓解工厂中遇到的许多问题，并提高电力的有效传输和分配。在申请人开发的方法中，具有笼形转子的商用三相感应电机已经在超前功率因数下操作。与使用电流注入手段的先前尝试不同，简单的电力电子转换器使用电压注入技术来实现机器电流相对于电网的相移。与目前使用的其他技术相比，这种电压注入是使用具有更少组件的低成本电力电子设备来实现的。新技术还解决了与感应电机相关的第二个重要技术问题，即降低电压启动以降低启动电流，从而降低公用电网电压的电压干扰。这种双重功能使该技术在商业上更具可行性。初步实验结果证明，该技术的工作原理与预期一致，该计划将在证明新技术的商业可行性方面迈出下一步。