Carsten Nesgaard Department of Electric Power Engineering

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Presentation transcript:

Optimized load sharing control by means of thermal reliability management Carsten Nesgaard Department of Electric Power Engineering Technical University of Denmark Henrik Møller

Power system configuration Parallel-connected units: Parallel-operation of multiple converters is employed when specifications require: Fault tolerance Reliability enhancement Redundancy Modular system structure.

Converter Schematic overview of key converter elements:

Reliability Annual ‘down-time’: A test system comprised of two parallel-connected converters utilizing current sharing has an annual ‘down-time’ of 10 minutes and 14 seconds. Tav = 95,7C 10 min. 14 sec. / year Tav = 77,3C Different Tav due to: Parameter/component variations Working environment conditions

Current sharing technique (“Prior art”) Converter and current sharing structure:

Current sharing technique (“Prior art”) Measurements: The following two graphs show actual measurements of a two-converter power system. Current division in a two-converter system: Efficiency in a two-converter system: Converter 1 Converter 2 NO sharing efficiency Current sharing efficiency

Thermal reliability management (Invention) Principle of the invention: Thermal reliability management implementation is simple and cost-effective. The temperature sensing device is simply mounted at the most critical location within the converter. Temperature sensing signal replaces current sensing signal:

Thermal reliability management (Invention) Measurements: The following two graphs show actual measurements of a two-converter power system utilizing thermal reliability management. Current division in a two-converter system: Efficiency in a two-converter system: Converter 1 Converter 2 NO sharing efficiency Current sharing efficiency Thermal rel. man. efficiency

Thermal reliability management (Invention) Dynamic change in power throughput:

Reliability Annual ‘down-time’: Applying thermal reliability management to the previously shown two-converter power system results in an annual ‘down-time’ of 6 minutes and 11 seconds. Total annual ‘down-time’ is reduced by almost 40%. 6 min. 11 sec. / year Tav = 78,5C

Summary Advantages: Optimized reliability  fundamentally different load sharing control Minimized losses  increased overall efficiency Simple implementation Ready for immediate implementation in both new and existing designs Disadvantages: Individual converter failure rate might increase slightly. However, it is aaby far compensated through a much lower average temperature.