A new method for harmonic penetration study in power networks with renewable generation

Nowadays, many power electronic equipments are used in industry in seeking higher system reliability and efficiency, and more electronic or microprocessor controllers are used in power system to control AC/DC transmission lines or loads. Moreover, the importance of green energy such as wind and solar is continually growing in our societies not only due to environmental concerns but also to resolve the problem of access to electricity in rural areas. As a result, it creates power quality issues especially harmonics. In electrical power system, harmonics have a number of undesirable effects on power system equipment as well as on its operation. In order to understand the effects of these harmonics it is first necessary to analyse the penetration of these harmonics from their various sources into the network. This process of analysis is commonly known as harmonic power flow or harmonic penetration evaluation. In the thesis a review is conducted on existing harmonic power flow methods. The previous approaches require long computing time and encounter convergence problem because of poor initial value. They are only applied to small or medium power systems with a single harmonic source. A new fast hybrid method (FHM) is developed in the thesis. It is a frequency domain method which can be used to evaluate the steady state harmonic penetration with discrete harmonic frequency. It is able to solve the convergence problem, simplify the calculation procedure and achieve accurate results. In addition, the proposed method has been applied to single phase balanced large power systems (e.g. Polish 2383-bus power system) to evaluate the harmonic penetration with integrating renewable generations. The investigation also includes the effects of harmonic penetration by changing the power capacities of renewable generations. Harmonic penetration variation during a 24 hour period is also investigated by tracking the daily generation and load demand curves. The harmonic sources considered in the thesis consist of wind turbine generator (WT), photovoltaic generator (PG), electric vehicle charger (EVC) and traditional six-pulse converters.

Name dc:type.qualificationname

phd

Level dc:type.qualificationlevel

doctoral-pg

Grantor dc:publisher.institution

University of Strathclyde

Year dc:date.issued

2014

Author dc:creator

• Lu, Jianfeng

DOI

10.48730/ank6-ed03

Identifier

T13933

OAI identifier oai:identifier

oai:strathclyde:jw827b65j