Schneider Electric Solar Inverters USA, Inc.

Xantrex Technology Inc.

Emanuel Serban

Cosmin Pondiche-Muresan

At least one aspect of the disclosure is directed to a power conversion unit (PCU). The PCU includes a power converter circuit, a safety detection circuit including a plurality of known network impedances and a switch having a first end coupled between two of the plurality of network impedances and a second end coupled to an output terminal, and a controller communicatively coupled to the safety detection circuit and the at least one power converter circuit. The controller may be configured to operate the switch, determine one or more voltage values of the safety detection circuit, and calculate an insulation impedance based at least in part on the one or more voltage values, a position of the switch, and the plurality of known network impedances.

Systems and methods for insulation impedance monitoring

According to one aspect, embodiments herein provide a renewable energy-based power converter comprising an input, a high-side DC bus, a low-side DC bus, a first output, an inverter portion configured to convert DC power from the high-side DC bus and the low-side DC bus into output AC power, an interface converter coupled to the high-side DC bus and the low-side DC bus, a first auxiliary DC-DC converter, and a controller, wherein, in a first mode of operation, the DC busses are configured to receive input DC power from the input, and the controller is configured to operate the interface converter to convert DC power from the DC busses into regulated DC power, to operate the interface converter to balance voltage levels of the DC busses, and to operate the first auxiliary DC-DC converter to convert the regulated DC power into first output DC power provided to a DC load.

DC voltage control in renewable energy based multilevel power converter

A control strategy for distributed power generation modules in a power system that varies the line frequency or voltage according to a predetermined pattern to cause a PV inverter to modify its power output and thereby avoid overcharging a battery. When the power system operates in islanded mode, the AC load demand can be lower than the available energy from the PV array, causing the battery to become overcharged. To avoid this scenario, a hybrid inverter executes a pattern generator algorithm that varies the line frequency or voltage linearly, exponentially or any mathematical function or look-up tables. The PV inverter executes a pattern detection algorithm that detects the linear, exponential, or any mathematical function or look-up table change in the line frequency. In response, the PV inverter modifies its power output until an overcharging condition of the battery is removed. The line frequency/voltage can be varied within the anti-islanding limits.

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New Westminster, Canada

Emanuel Serban