High-voltage DC converter for solar power station

Abstract

In the article the circuit design solution of DC-DC regulated resonant converter has been proposed for using with hybrid photovoltaic modules which has cooling equipment and solar concentrators in order to maximize electric power generating by such module. By using computer simulation based on multiple iterations algorithm we significantly increase the accuracy of determining the resonance circuit optimal parameters for build up DC–DC converters to work in a wide range of electric powers. Based on optimal values of the resonance LLC scheme parameters, achived by numerical calculation it can be show high values of electrical energy transformation efficiency for photovoltaic energy station equipped with high efficiency hybrid photovoltaic modules. Implementation of microprocessor-based control into design of DC–DC back-boost converters create a new possibility to build control algorithms for increase reliability and conversion efficiency, rapid and precision stabilization of maximum power point, implementation network monitoring of photovoltaic modules, converters itself and the whole photovoltaic station parameters.

Modernisation of DC-DC converter topologies for solar energy harvesting applications: A review

“…Additionally, when buck-boost converters operate in continuous conduction mode (CCM), the input current is smooth and continuous with very little ripple. The voltage and current stress placed on components by two-switch buck-boost converters is significantly lower than that of single-switch buck-boost converters [22], [42], [53], [81], [87], [97], [102], [103], [115], [117], [119], [125], [133], [138], [142], [146], [164], [168], [222], [225], [263], [264], [266], [288], [289], [308]- [320]. Ahmed et al [315] present a twoswitch non-inverting buck-boost converter with the possibility for extra current storage.…”

“…This component converts the PV-produced variable DC voltage into a fixed voltage that is proportionate to the load requirements. The MPPT controller simultaneously works to achieve MPP conversion from PV and provide a pulse width modulation (PWM) signal to drive the DC-DC converter's switching mechanism [22], [23], [25], [27], [28], [32], [38], [39], [42], [43], [52], [77], [81], [93], [94], [98], [108], [112], [121]- [146]. These two processes happen simultaneously.…”

“…This solar energy harvesting technology is becoming more popular as an alternative to fossil-fuel-generated electricity. A solar water heater is an excellent example of a solar energy harvesting application that is widely used in sunny climates around the world [1]- [22]. Power electronic interfaces or power converters, such as DC-DC converters, are required to convert the low DC output voltage from a solar PV energy harvesting system to the voltage rating required by any suitable utilization voltage.…”

“…Each converter requires a power switching device to turn on and off as needed. In addition, load matching and increased power output from the PV systems should be possible with the usage of DC-DC converters in conjunction with maximum power point tracking (MPPT) [16], [22]- [43].…”

Experimental investigation of bidirectional series resonant DC-DC converter in different operating modes

“…Lichev [23] presented a study of inductor-capacitor or LC bidirectional series resonant DC-DC converter. Unlike inductor-inductor-capacitor or LLC converters [24], [25] the resonant tank circuit consists of only two reactive elements. This creates an opportunity for converter size optimization, which leads to The results from the theoretical study in [23] show that the analysed converter operates with no limitations in zero voltage switching (ZVS) irrespective of the control parameter value.…”