Abstract
The use of distributed generation (DG) plants in power supply systems is a rapid development line. However, the impact of DG on power quality is multivalued. On the one hand, the presence of DG allows to reduce voltage losses. On the other hand, a phenomenon called flicker and associated with rapid voltage fluctuations is possible. This effect is usually manifested at an abrupt voltage drop in the DG generator connection unit. The processes taking place in the network when flicker occurs in networks with DG have not been sufficiently studied. The article presents results of the flicker modeling in a network equipped with DG plants, implemented on the basis of synchronous generators. The results obtained indicated that with sharp disturbances caused by switching on and off an additional load, flicker is observed in networks with unregulated generators, accompanied by voltage and frequency fluctuations. Based on the wavelet transformation and spectral analysis methods, it was found that the power spectral density of the generated flicker-noise is inversely proportional to the frequency. The use of look-ahead control algorithms to control the excitation and rotors rotational speed of the DG plants generators, as well as concordant adjustment of their controllers, increases stability and removes flicker completely.
Highlights
Distributed generation (DG) plants are broadly used nowadays to develop and upgrade power supply systems (PSS), but there are power sources which are located in close proximity from the consumers and whose operation is based on the different technologies: wind power generators, solar batteries, fuel cells, gas turbine power plants, mini- and micro-HPPs, etc.Distributed power generation is a counterpart of Smart Grids concept [1,2,3] and can be used for mains load shedding, power and energy losses reduction and enhancing PSS reliability and survivability
A broader study of the DG plants based on automatic voltage regulators (AVR) and automatic speed regulators (ASR) generators require a precise assessment of their affect on PSS to eliminate power quality deterioration
The computational experiments carried out on the model indicated that in case of operation of small turbine generators without AVR and ASR, there is a high probability of stability loss and the occurrence of an asynchronous run when an additional load is connected, which causes a decrease in voltage in the DG plants connection assembly
Summary
Distributed generation (DG) plants are broadly used nowadays to develop and upgrade power supply systems (PSS), but there are power sources which are located in close proximity from the consumers and whose operation is based on the different technologies: wind power generators, solar batteries, fuel cells, gas turbine power plants, mini- and micro-HPPs, etc. Low-power generators can cause voltage fluctuations which cause flicker in some cases [4, 8,9,10]. This can occur in case of an abrupt voltage drop in the connection node of DG plant. A broader study of the DG plants based on AVR and ASR generators require a precise assessment of their affect on PSS to eliminate power quality deterioration. The PSS consisted of DG plants, implemented on the basis of two turbine generators (Synchronous Machine units) with a rated power of 3.125 MVA each and 6.3 kV voltage.
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