US 2017/0288561 A1 · Microgrid Power Architecture

Abstract

Power converters, and microgrids driven by such a power converter, in which the converter is controlled by a proportional controller which operates directly on AC waveforms, preferably without conversion to a DC type signal; preferably with use of voltage compensation to remove inherent error of proportional controller; and preferably with use of individual phase RMS voltages in the voltage compensation, to allow for normal operation under any load condition. Undervoltage of one or two phases is automatically compensated by adjusting the voltage of all phases, to retain balance. Line-starting of a motor load is automatically detected, and frequency droop is driven, apart from the other control relations in the system, to complete the line-starting operation as quickly as possible.

Claims21

Dependent claims

A method of operating an electronic power converter, comprising:

measuring the output of an electronic power converter against a varying reference value which has a sinusoidal dependence on time;
and
in accordance with the measuring step, generating a first output command for the converter, using a pure proportional control relation with no integration component;
and using an additional control relation to adjust the output command, in dependence on the magnitude of a measured electrical value, to remove offset error and thereby generated an adjusted output command for each phase;
and
initiating a current limiting operation, which limits current to a varying value which also has a sinusoidal dependence on time, if the measuring step shows an overcurrent value;
and
if one or two phases exhibit fault conditions reducing the adjusted output command of the other phase or phases, to thereby restore the balance of the different phases;
and
sending the adjusted output command to the converter as a control input.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/474,944Filed 30 Mar 2017

Priority

30 Mar 2016

Published

5 Oct 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification12 codes

H02M 5/293
Using devices of a triode or transistor type requiring continuous application of a control signal: using semiconductor devices only
G01R 21/007
Arrangements for measuring electric power or power factor: adapted for special tariff measuring
H02J 3/38
Circuit arrangements for AC mains or AC distribution networks: arrangements for feeding a single network from two or more generators or sources in…
H02M 1/084
Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters: using a control…

Family

Application62/315,447Us provisional application · filed 30 Mar 2016

Application62/326,660Us provisional application · filed 22 Apr 2016

Application62/326,662Us provisional application · filed 22 Apr 2016

Application62/329,052Us provisional application · filed 28 Apr 2016

Application62/360,860Us provisional application · filed 11 Jul 2016

Application62/360,783Us provisional application · filed 11 Jul 2016

Application62/360,798Us provisional application · filed 11 Jul 2016

Application62/360,682Us provisional application · filed 11 Jul 2016

Application62/457,037Us provisional application · filed 9 Feb 2017

US 2017/0288561 A1This patent

From the US filing history. Foreign family members aren’t listed.

Microgrid Power Architecture

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Microgrid Power Architecture

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Abstract

Claims21