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Energy balancing in modular multilevel converter systems

Blaszczyk P., Koska K., Klimczak P.

Bulletin of the Polish Academy of Sciences. Technical Sciences

2017

Vol. 65, nr 5

685--694

The modular multilevel converter (MMC) is a well-known solution for medium and high voltage high power converter systems. This paper deals with energy balancing of MMCs. The analysis includes multi-converter systems. In order to provide clear view, the MMC control system is divided into hierarchical levels. Details of control and balancing methods are discussed for each level separately. Finally, experimental results, based on multi-converter test setup, are presented.

Interpolated-DFT-Based Fast and Accurate Amplitude and Phase Estimation for the Control of Power

Borkowski J., Kania D.

Metrology and Measurement Systems

2016

Vol. 23, nr 1

13--26

Quality of energy produced in renewable energy systems has to be at the high level specified by respective standards and directives. One of the most important factors affecting quality is the estimation accuracy of grid signal parameters. This paper presents a method of a very fast and accurate amplitude and phase grid signal estimation using the Fast Fourier Transform procedure and maximum decay side-lobes windows. The most important features of the method are elimination of the impact associated with the conjugate’s component on the results and its straightforward implementation. Moreover, the measurement time is very short ‒ even far less than one period of the grid signal. The influence of harmonics on the results is reduced by using a bandpass pre-filter. Even using a 40 dB FIR pre-filter for the grid signal with THD ≈ 38%, SNR ≈ 53 dB and a 20‒30% slow decay exponential drift the maximum estimation errors in a real-time DSP system for 512 samples are approximately 1% for the amplitude and approximately 8.5・10‒2 rad for the phase, respectively. The errors are smaller by several orders of magnitude with using more accurate pre-filters.

Weryfikacja poprawności działania elektrohydraulicznego regulatora mocy turbiny kondensacyjnej, biorącej udział w regulacji systemu elektroenergetycznego

Karczewski J., Pawlak M.

Wiadomości Elektrotechniczne

2014

R. 82, nr 1

34--37

Przedstawiono wyniki badań przeprowadzonych na blokach energetycznych 120 MW wyposażonych w mikroprocesorowe elektrohydrauliczne regulatory mocy (MREH) turbiny kondensacyjnej.

The paper presents results of tests conducted on 120 MW power units equipped with microprocessor electro-hydraulic power controllers (MREH) of condensing turbine.