已有 372 次阅读 2020-2-26 20:01 |系统分类:博客资讯

英国巴斯大学(University of Bath)电气电子工程系马康助理教授课题组热忱欢迎访问学生\学者,要求如下:

1) 访问者为在读博士生或具有教职。

2) 专业方向为电力系统方向,优先考虑配电网规划与运行方向,比如分布式电源\电动汽车接入配电网。

3) 访问期限为半年到一年,随时可以开始。

4) 要求学术访问有明确具体的目标(即“立flag“),比如共同发表电力领域IEEE Transactions论文一篇,或者联合申请基金项目。这也是我所在院系对访问学者的期待。








Phase Imbalance in Electrical Distribution Networks

Phase imbalance is a widespread problem in the UK's three-phase four-wire and five-wire low voltage (LV, 415V) distribution networks. More than 70% of these networks suffer from moderate or severe degrees of phase imbalance. For instance, it is not uncommon to see that one phase has a peak current of 300 A and another phase only has 150 A. This problem is also prevalent in European LV distribution networks as well as the medium-voltage distribution networks in the US, China, and other countries in the world. This problem will be aggravated by the increase of photovoltaic generation, wind generation, and electric vehicles, if they are not properly controlled.



In practice, the major causes for phase imbalance are: (1) an uneven allocation of customers across the three phases (I will refer to the phases as a, b and c) and (2) random customer behavior.



Phase imbalance has three main consequences:

1) Phase imbalance wastes network capacity. For instance, consider the common situation where phase a carries, say 72 kW with no spare capacity and the other two phases (b and c) carry 36 kW with 50% spare capacity. Customers on phase a cannot connect any additional appliances without overloading the system, yet the large margins on phases b and c cannot be transferred to phase – they are effectively wasted by phase imbalance.

2) Energy losses are increased by more than 20% (equivalent to 4 ~ 5 TWh, or worth more than £4 bn by 2050 throughout the UK, compared to the ideal phase balanced case).

3) It causes “a current of imbalance”, also known as the zero-sequence current. An additional conductor, the neutral wire, is required to carry this neutral current. This incurs an additional investment cost compared to the ideal phase balanced case.



In attempting to cure the problem, researchers are confronted by three main challenges: (i) too little data available in LV networks, which I refer to as blindness, (ii) scalability (millions of LV networks need to be phase balanced), and (iii) adaptability (the imbalance condition changes over time because of random customer behavior and the connections of electric vehicles).


Research tasks

My research involves understanding the characteristics and consequences of phase imbalance and developing data-efficient (requiring a minimal amount of data), scalable, adaptive solutions to rebalance the three phases.



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