Testing of module integrated electronics using power reversal
View Patent ↗A method for testing a photovoltaic (PV) module includes applying a test sequence to the integrated power converter, reversing the integrated power converter in response to the test sequence, and obtaining test results from the PV module in response to the test sequence. The test sequence may include applying reverse excitation power to output terminals of the reversible integrated power converter. The reverse excitation power may provide bootstrap power to one or more components of the integrated power converter. The test method may include activating substantially the entire reversible drive train, testing the drive train and characterizing the PV cells in the module in response to the reverse excitation power.
1. A photovoltaic (PV) module comprising:
an arrangement of one or more PV cells;
an integrated power converter to process power from the arrangement of one or more PV cells, wherein the integrated power converter is reversible;
a pair of power outputs of the integrated power converter to couple the integrated power converter to a power source or load; and
a controller to sense a test mode by sensing a test sequence applied to the pair of power outputs by a test controller and reverse a power flow to the arrangement of one or more PV cells from the integrated power converter in response to sensing the test mode.
2. The PV module of claim 1 wherein the integrated power converter comprises a bootstrap power supply to operate the controller in response to the test sequence applied to the pair of power outputs.
3. The PV module of claim 1 further comprising a communication interface to transmit test results in response to the test sequence applied to the pair of power outputs.
4. The PV module of claim 1 further comprising one or more observable points to provide test results in response to the test sequence applied to the pair of power outputs.
5. The PV module of claim 1 wherein the controller includes one or more pre-programmed sequences to run one or more self-tests.
6. The PV module of claim 1 wherein the controller includes sensing hardware to sense one or more output signatures in response to the test sequence applied to the pair of power outputs.
7. The PV module of claim 6 wherein the controller includes hardware to store one or more reference signatures and compare the one or more reference signatures to the one or more output signatures obtained through the sensing hardware.
8. A system comprising:
a photovoltaic (PV) module having an arrangement of one or more PV cells and a reversible integrated power converter coupled to the arrangement of one or more PV cells and a controller coupled to the reversible integrated power converter;
a power source coupled to a pair of power outputs of the reversible integrated power converter; and
a test controller to control the power source to apply reverse excitation power to the pair of power outputs of the reversible integrated power converter and receive test results from the PV module, the controller being configured to sense a test mode by sensing a test sequence applied to the pair of power outputs by the test controller and reverse a power flow to the arrangement of one or more PV cells from the reversible integrated power converter in response to the test mode.
9. The system of claim 8 further comprising a flash pattern generator coupled to the test controller and arranged to apply a flash pattern to the arrangement of one or more PV cells.
10. The system of claim 8 wherein the test controller is coupled to a communication interface on the PV module to acquire one or more output signatures from internal hardware in the PV module.
11. The system of claim 8 further comprising a data acquisition system coupled between the PV module and the test controller to acquire one or more output signatures from the PV module.