Abstract
An analysis of the method for ensuring the sinusoidality of the output voltage in power generation systems with self-commutated voltage inverters under the requirements of the international standard IEEE-519 is presented. In a number of programs, especially low-power generation systems, a low-cost solution is needed to provide the sinusoidal waveform of the output voltage with the total harmonic distortion of 5 %. This solution is to use two-level voltage inverters with an output sine LC filter. However, the feature of the sine filter with the frequency converter is that the PWM frequency affects the spectrum of higher harmonics of the output voltage. In addition, there is the starting current of the filter capacitor, which can disable the power switches of the voltage inverter. The developed method for calculating the values of the LC filter with the two-level voltage inverter in the PWM mode is presented meeting the requirements of the international standard IEEE-519, taking into account the modulation frequency and limitation of the starting current of the filter capacitor. To confirm the required quality of the output voltage of the two-level voltage inverter with the sine filter, an appropriate simulation model was created in the Matlab/Simulink computer simulation environment. The oscillograms and harmonic analysis of the input and output voltages of the sine filter, which showed the total harmonic distortion of 1.88 %, are presented. A physical prototype of the investigated system was created on the basis of a 5.5 kW OVEN PChV203-5K5-V frequency converter (Ukraine). Using the SIGLENT SDS1104X-E oscilloscope (China), the real waveform and the results of the harmonic analysis of the sine filter output voltage, confirming the implementation of the necessary sinusoidality criteria, were obtained
Highlights
The share of alternative power sources in the overall energy sector is growing every year
The aim of the study is to create a method for calculating the values of the sine filter of the self-commutated voltage inverter, which takes into account the pulsewidth modulation frequency of the inverter and allows the limitation of the filter capacitor starting current
Analytical dependences of the values of the sine filter of the two-level voltage inverter in the PWM mode, which provides, firstly, the sinusoidality of the output voltage under the international standard IEEE-519 taking into account the PWM frequency of the voltage inverter, and, secondly, limitation of the starting current to the required value, were developed
Summary
The share of alternative power sources in the overall energy sector is growing every year. According to the UN, in 2008, $190 billion was invested in alternative power projects worldwide, while $110 billion was invested in coal and oil production [1, 2]. According to the British Petroleum (BP) transnational voltage of the two-level voltage inverter is 65...70 %, which oil and gas company, in 2019 the share of alternative renew- does not meet the voltage quality requirements under the able energy sources (excluding large hydropower plants) was international standard IEEE-519. In primary energy (total energy balance), inverter output voltage, such as various multilevel voltage the share of alternative energy increased to 5 %, rising from inverter circuits.
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