Abstract
This paper proposes a novel, cost-effective grid-connected inverter for a domestic micro combined heat and power system. A high-frequency (∼12 000 r/min), high-voltage (∼425 Vdc) brushless dc machine is used as the generator. The output of the generator is injected into the grid through a novel grid-connected inverter, utilizing a digital algorithm for the implementation of a constant frequency hysteresis current control. This allows a simplified output filter with smaller components to be employed. A grid synchronization method has also been designed, based on a low-pass filter and a microcontroller to optimize/tune the output power factor. The proposed method is successfully applied to a 500-W, 230-V, 50-Hz grid-connected voltage-source inverter (VSI) prototype, where the output of the VSI has been demonstrated to comply with the operating regulations for domestic distributed power generation systems.
Highlights
MICRO combined heat and power is defined as an energy conversion unit with an electrical capacity below 15 kW that simultaneously generates heat and power [1]
This paper describes the power electronics design of the cost effective micro-CHP, which comprises: a 7-pole-pair brushless DC machine
The DC injection was measured at < 8 mA; below the < 2 kW This paper proposes a reliable, low cost and long life-time inverter limit of 20 mA, and the power factor was > 0.97. mains power generation system which can be implemented
Summary
MICRO combined heat and power (micro-CHP) is defined as an energy conversion unit with an electrical capacity below 15 kW that simultaneously generates heat and power [1]. The proposed micro-CHP system is expected to produce around 9.5 kW of domestic heating, and 800 W of mechanical power which is converted into 500 W of electrical power fed into the grid. We propose to achieve the new micro-CHP by incorporating a Rankine steam cycle and power electronics into an existing boiler package to minimize development costs. Models) which has been optimized to convert mechanical power from a ~12,000 rpm turbine into DC link electrical power; a novel single phase grid-connected inverter which has been designed using an innovative hysteresis current control (HCC) technique to inject up to 500 W into the UK mains grid; a grid synchronization module based on a low-pass filter and a variable micro-controller delay, which can achieve reliable phase alignment and power factor control
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