Advanced HVDC Converter Applications in the Modern Power Grid

现代电网中的先进 HVDC 转换器应用

• 批准号: 4777-2012
• 负责人: Gole, AniruddhaMadhukar
• 金额: $ 3.06万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=637106
• 关键词: Advanced; HVDC; Converter; Applications; Modern

High Voltage Direct Current (HVDC) transmission is growing in importance. Power generators are usually ac (alternating current) generators, and most loads are also ac. The HVDC transmission system connects these together by transforming the ac voltage to dc and then back to ac. In comparison with ac transmission, HVDC has reduced losses and does not require the sending and receiving end ac networks to be synchronized. Consequently it is seen as a preferred means to transport renewable energy from remote locations such as remote wind farms, to distant load centres. Conventionally, the Line Commutated Converter (LCC) has been the only type of ac-dc converting equipment to handle large power ratings. Its drawback is that it works poorly under distortion or under-voltage conditions. However, two other types of converter, the Voltage Sourced Converter (VSC) and the Capacitor Commutated Converter (CCC) have recently been introduced and are not susceptible to this problem. As HVDC penetration in the network grows, it is more and more likely that HVDC converters of different types (i.e. LCC, VSC, etc.) will terminate in close proximity and interfere adversely with each other. The resulting system is referred to as a multi-infeed HVDC system. Using advanced computer simulation tools, I intend to investigate the sensitivity of such inter-converter interactions to various network parameters, with a view to establishing guidelines for converter placement. My team and I hope to develop improved control algorithms that would minimize such interaction. Another objective of our research is to develop techniques to estimate the losses in VSC converters, with a view to determining the operating conditions under which these are minimized. The significant outcome of this research will be the development of study methods, modelling tools and improved designs for multi-infeed HVDC systems and dc grids. This will hopefully result in more robust power transmission schemes that can operate securely, efficiently and reliably.

高压直流 (HVDC) 传输的重要性日益增加。发电机通常是交流发电机，大多数负载也是交流电。高压直流输电系统通过将交流电压转换为直流电压，然后再转换回交流电压，将这些电压连接在一起。与交流输电相比，高压直流输电损耗减少，且不需要发送端和接收端交流网络同步。因此，它被视为将可再生能源从偏远地区（例如偏远风电场）运输到遥远负载中心的首选方式。传统上，线路换向转换器 (LCC) 是唯一一种能够处理大额定功率的交流-直流转换设备。其缺点是在失真或欠压条件下工作效果较差。然而，最近推出了另外两种类型的转换器，即电压源转换器 (VSC) 和电容换向转换器 (CCC)，并且不易受此问题的影响。随着 HVDC 在网络中渗透率的增长，不同类型的 HVDC 转换器（即 LCC、VSC 等）越来越有可能在非常接近的位置终止并相互产生不利干扰。由此产生的系统被称为多馈电 HVDC 系统。我打算使用先进的计算机模拟工具来研究这种转换器间交互对各种网络参数的敏感性，以期为转换器的放置建立指南。我和我的团队希望开发改进的控制算法，以最大限度地减少这种相互作用。我们研究的另一个目标是开发估计 VSC 转换器损耗的技术，以确定将损耗最小化的操作条件。这项研究的重要成果将是开发多馈电高压直流输电系统和直流电网的研究方法、建模工具和改进设计。这有望带来更稳健的电力传输方案，能够安全、高效和可靠地运行。