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US 8,289,742 B2Granted
Parallel connected inverters
AssigneeSolaredge, Ltd.
InventorsMeir Adest, Guy Sella, Lior Handelsman, Yoav Galin, Amir Fishelov, Meir Gazit, Tzachi Glovinski, Yaron Binder
Life of this patent
Estimating the term…
Abstract
A distributed power system wherein a plurality of power converters are connected in parallel and share the power conversion load according to a prescribed function, but each power converter autonomously determines its share of power conversion. Each power converter operates according to its own power conversion formula/function, such that overall the parallel-connected converters share the power conversion load in a predetermined manner.
Claims15
A distributed power system comprising:
- a direct current (DC) power source;
- a plurality of inverters with respective inverter inputs adapted for connection in parallel to said DC power source and with respective inverter outputs adapted for connection in parallel;
- and
- a plurality of control modules coupled respectively to said inverter inputs and outputs, wherein for each inverter said respective control module includes:
- (i) a voltage loop block configured to sense a voltage at the input and to compare the voltage at the input to at least one previously specified reference voltage and to output a current reference signal based on the comparison;
- and
- (ii) a current loop block configured to sense an input current to the inverter and to compare said current reference signal with a current signal proportional to the input current of the inverter to adjust the input current until an input power equilibrates.
4 more elements
In a distributed power system including:
- a direct current (DC) power source;
- a plurality of inverters with respective inverter inputs adapted for connection in parallel to the DC power source and with respective inverter outputs adapted for connection in parallel;
- a method comprising the steps of:
- the inverters inverting power from the DC power source to an output power;
- and
- for each inverter, sensing a current and a voltage at the input of the inverter,
- comparing the voltage at the input of the inverter to at least one previously specified reference voltage to produce a voltage comparison,
- outputting a current reference signal based on the voltage comparison,
- comparing the current reference signal with a current signal proportional to the input current of the inverter, and
- adjusting the input current until an input power equilibrates.
7 more elements
A distributed power system comprising:
- a direct current (DC) power source;
- a plurality of power converters with respective power converter inputs adapted for connection in parallel to said DC power source and with respective power converter outputs adapted for connection in parallel;
- and
- a plurality of control modules connected respectively to said power converter inputs and outputs,
- wherein for each converter said respective control module includes:
- (i) a voltage loop block configured to sense a voltage at the input and to compare the voltage at the input to at least one previously specified reference voltage and to output a current reference signal based on the comparison;
- and
- (ii) a current loop block configured to sense an input current to the converter and to compare said current reference signal with a current signal proportional to the input current of the converter to adjust the input current until an input power equilibrates.
5 more elements
A system for controlling load balancing of a plurality of inverters with respective DC inputs adapted for connection in parallel to a DC power source, the system comprising:
- for each of the inverters, a control module operatively attached to the inverters, wherein the control module is configured for individually controlling current drawn by each one of said inverters from the respective DC input, wherein said controlling current is responsive to said respective DC input;
- whereby the inverter is configured to autonomously draw a portion of a load of inverting power from said respective DC input and convert said portion to output power, while avoiding master/slave control between the control modules;
- and
- wherein for each inverter said control module includes:
- (i) a voltage loop block configured to sense the voltage at the input and to compare the voltage at the input to at least one previously specified reference voltage and to output a current reference signal based on the comparison;
- and
- (ii) a current loop block configured to sense the input current to the inverter and to compare said current reference signal with a current signal proportional to the input current of the inverter to adjust the input current until the input power equilibrates.
4 more elements
Dependencies are inferred from the claim text.