Power converter for executing anti-islanding procedures upon detecting an islanding condition
First Claim
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1. A power system comprising:
- at least one power source providing direct current (DC) power;
a power converter comprising;
an inverter that converts the DC power to alternating current (AC) power;
an AC filter coupled to an output of the inverter;
a voltage sensor coupled to an output of the AC filter;
a current sensor coupled to the output of the AC filter;
an inductive coupler configured to couple the power system to a power grid; and
a switch operable to disconnect the inductive coupler from the power system and retain a connection between the power system and a local load; and
,an inverter controller providing to the inverter, an inverter control signal for modifying an operation of the inverter during an islanding condition, the islanding condition identified by using one or both of the voltage sensor and the current sensor to detect a change from a resistive load to an inductive load, the resistive load corresponding to the local load and the inductive load corresponding to the inductive coupler.
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Abstract
A power converter including a detection apparatus and method for detecting an islanding condition based on measurements of one or more currents and voltages within the power converter provided to a current regulator to generate a signal that is provided in a positive feedback loop and is indicative of an islanding condition.
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Citations
14 Claims
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1. A power system comprising:
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at least one power source providing direct current (DC) power; a power converter comprising; an inverter that converts the DC power to alternating current (AC) power; an AC filter coupled to an output of the inverter; a voltage sensor coupled to an output of the AC filter; a current sensor coupled to the output of the AC filter; an inductive coupler configured to couple the power system to a power grid; and a switch operable to disconnect the inductive coupler from the power system and retain a connection between the power system and a local load; and
,an inverter controller providing to the inverter, an inverter control signal for modifying an operation of the inverter during an islanding condition, the islanding condition identified by using one or both of the voltage sensor and the current sensor to detect a change from a resistive load to an inductive load, the resistive load corresponding to the local load and the inductive load corresponding to the inductive coupler. - View Dependent Claims (2, 3, 4, 5)
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6. A power system comprising:
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an inductive coupler configured to couple the power system to a power grid; a switch operable to disconnect the inductive coupler from the power system and retain a connection between the power system and a local load; and an inverter controller comprising; a current regulator configured to generate a component signal based in part on a DC voltage measurement at an input of an inverter and a first AC current measurement at an output of the inverter, the component signal provided as feedback in a feedback loop for generating an output signal that is used for generating a command signal; and a modulator that generates an inverter control signal based in part on the command signal, the inverter control signal provided to the inverter for modifying an operation of the inverter when an islanding condition exists, the islanding condition identified by using at least the first AC current measurement to detect a change from a resistive load to an inductive load, the resistive load corresponding to the local load, and the inductive load corresponding to the inductive coupler. - View Dependent Claims (7, 8, 9, 10)
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11. A method of controlling an inverter comprising:
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determining in an inverter controller, a component signal based on at least a DC voltage measurement at an input of an inverter and a first AC current measurement at an output of the inverter, the component signal indicative of a change from a resistive load to an inductive load in a power converter system; determining an inverter control signal based at least in part on the component signal; and using the inverter control signal to stop the inverter from generating AC power during an islanding condition. - View Dependent Claims (12, 13, 14)
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Specification