8 research outputs found
Sensorless unbalance correction as an ancillary service for LV 4-Wire/3-Phase power converters
IEEE Energy Conversion Congress and Exposition (9th. 2017. Cincinnati
Sensorless Unbalance Modelling and Estimation as an Ancillary Service for LV 4-Wire/3-Phase Power Converters
This paper describes a method to provide LV four-wire three-phase power converters with the capability of unbalance estimation as an ancillary service to the main role that they play in the distribution system (distributed generator, energy storage system, drive, etc). Typically, dedicated grid/load current sensors are needed to effectively comply with unbalance compensation tasks, increasing system cost and reducing reliability. This is due to the difficulties that arises in the extraction of the zero and negative voltage components from the voltages at the point of common coupling, such as the inadequate resolution of full-scaled voltage sensors and limited spectral separation. In this paper, the proposed method does not rely on additional sensors to those typically used in VSCs, and in any case, those sensors are limited to the point of connection of the power converter. Impedance estimation only using converter-side current sensors is implemented by adding a high frequency voltage excitation over the fundamental command. A new model approach is proposed for the real-time extraction of system impedance using a complex-valued compact form. Considering the voltage source at that frequency to be unique in the grid, it will be proved the impedance can be estimated and, thus, the resulting negative sequence current which is used for unbalance compensation. For the zero sequence, an especial arrangement of the converter voltage sensors together with a repetitive controller is used
Design and Control of a Hybrid 48V/375V/400VacAC/DC Microgrid
IECON 2019 - Annual Conference of the IEEE Industrial Electronics Society (45th. 2019. Lisboa
Li-ion Batteries Parameter Estimation UsingConverter Excitation and Fusion Methods
Energy Conversion Conference and Exposition 2019 (ECCE 2019) (2019. Baltimore
Design and Control of a Modular 48/400V Power Converter for the Grid Integration of Energy Storage Systems
IEEE Energy Conversion Congress and Exposition (ECCE) (2019. Baltimore
Homopolar harmonic injection and gridsynchronization in distributed control systems forgrid-tied intelligent power electronic blocks in4-wire 3-phase converters
IECON 2019 - Annual Conference of the IEEE Industrial Electronics Society (45th. 2019. Lisboa
Compensation Alternatives for Power SharingErrors in Multi-Port Converters for Hybrid DC/ACMicrogrids
2019 Energy Conversion Conference and Exposition (ECCE 2019) (2019. Baltimore