Real time voltage regulation through gather and broadcast techniques

Patent metadata

Field	Value
Publication number	US-2017214244-A1
Application number	US-201715418272-A
Country	US
Kind code	A1
Filing date	Jan 27, 2017
Priority date	Jan 27, 2016
Publication date	Jul 27, 2017
Grant date	—

Abstract

An example device includes a processor configured to receive a plurality of voltage measurements corresponding to nodes in a distribution network, and determine, for each respective node: a value of a first coefficient, based on a previous value of the first coefficient, a minimum voltage value for the node, and a voltage measurement that corresponds to the node, and a value of a second coefficient based on a previous value of the second coefficient, a maximum voltage value for the node, and the voltage measurement. The processor of the example device is also configured to cause an inverter-interfaced energy resource connected to the distribution network to modify its output power based on the value of the first coefficient for each node and the value of the second coefficient for each node.

First claim

What is claimed is:

1 . A device comprising:
at least one processor configured to:
receive a plurality of voltage measurements, wherein voltage measurements in the plurality of voltage measurements correspond to respective nodes in a plurality of nodes of a distribution network;
determine, for each respective node in the plurality of nodes:
a respective value of a first voltage-constraint coefficient, based on a respective previous value of the first voltage-constraint coefficient, a respective minimum voltage value for the respective node, and a respective voltage measurement in the plurality of voltage measurements that corresponds to the respective node; and
a respective value of a second voltage-constraint coefficient based on a respective previous value of the second voltage-constraint coefficient, a respective maximum voltage value for the respective node, and the respective voltage measurement; and

cause at least one inverter-interfaced energy resource in a plurality of inverter-interfaced energy resources that are connected to the distribution network to modify an output power of the at least one inverter-interfaced energy resource based on the respective value of the first voltage-constraint coefficient for each respective node and the respective value of the second voltage-constraint coefficient for each respective node.

2 . The device of claim 1 , wherein the at least one processor is configured to cause the at least one inverter-interfaced energy resource to modify the output power by outputting, to the at least one inverter-interfaced energy resource, the respective value of the first voltage-constraint coefficient for each respective node and the respective value of the second voltage-constraint coefficient for each respective node.

3 . The device of claim 1 , wherein:
the at least one processor is configured to determine the respective value of the first voltage-constraint coefficient by:
determining, based on the respective previous value of the first voltage-constraint coefficient, the respective minimum voltage value for the respective node, and the respective voltage measurement, a respective first coefficient offset value;
scaling the respective first coefficient offset value by a step size to determine a respective scaled first coefficient offset value;
responsive to determining that a respective first sum of the respective previous value of the first voltage-constraint coefficient and the respective scaled first coefficient offset value is greater than zero, setting the respective value of the first voltage-constraint coefficient to be the respective first sum; and
responsive to determining that the respective first sum is less than or equal to zero, setting the respective value of the first voltage-constraint coefficient to be zero, and
the at least one processor is configured to determine the respective value of the second voltage-constraint coefficient by:
determining, based on the respective previous value of the second voltage-constraint coefficient, the respective maximum voltage value for the respective node, and the respective voltage measurement, a respective second coefficient offset value;
scaling the respective second coefficient offset value by the step size to determine a respective scaled second coefficient offset value;
responsive to determining that a respective second sum of the respective previous value of the second voltage-constraint coefficient and the respective scaled second coefficient offset value is greater than zero, setting the respective value of the second voltage-constraint coefficient to be the respective second sum; and
responsive to determining that the respective second sum is less than or equal to zero, setting the respective value of the second voltage-constraint coefficient to be zero.

4 . The device of claim 3 , wherein:
the at least one processor is configured to determine the respective first coefficient offset value by:
determining a respective first difference value that represents a difference between the respective minimum voltage value and the respective voltage measurement; and
determining, as the respective first coefficient offset value, a difference between the respective first difference value and a version of the respective previous value of the first voltage-constraint coefficient that is scaled by a utility-defined parameter, and
the at least one processor is configured to determine the respective second coefficient offset value by:
determining a respective second difference value that represents a difference between the respective voltage measurement and the respective maximum voltage value; and
determining, as the respective second coefficient offset value, a difference between the respective third difference value and a version of the respective previous value of the second voltage-constraint coefficient that is scaled by the utility-defined parameter.

5 . The device of claim 1 , wherein:
the at least one processor is configured to determine the respective value of the first voltage-constraint coefficient by calculating pro {γ n k +α(V min − n k −εγ n k )}, wherein:
γ n k represents the respective previous value of the first voltage-constraint coefficient,
V min represents the respective minimum voltage value for the respective node,
n k represents the respective voltage measurement,
α represents a step size, and
ε represents a predetermined parameter indicating an importance of previous voltage-constraint coefficient values, and
the at least one processor is configured to determine the respective value of the second voltage-constraint coefficient by calculating pro {μ n k +α( n k −V max −εμ n k )}, wherein:
μ n k represents the respective previous value of the second voltage-constraint coefficient, and
V max represents the respective maximum voltage value for the respective node.

6 . The device of claim 1 , wherein the at least one processor is configured to cause the at least one inverter-interfaced energy resource to modify the output power by:
determining, for the at least one inverter-interfaced energy resource, a respective power setpoint value, based on the respective value of the first voltage-constraint coefficient for each respective node, the respective value of the second voltage-constraint coefficient for each respective node, and a respective previous power setpoint value, and causing the at least one inverter-interfaced energy resource to modify the output power based on the respective power setpoint.

7 . The device of claim 6 , wherein the device comprises a power distribution network management system.

8 . The device of claim 6 , wherein the device comprises a respective power inverter communicatively coupled to the at least one inverter-interfaced energy resource.

9 . A system comprising:
a plurality of voltage measurement devices, each configured to:
determine a respective voltage measurement that corresponds to a respective node in a plurality of nodes of a distribution network; and
output the respective voltage measurement;
a distribution network management system configured to:
receive, from each of the plurality of voltage measurement devices, the respective voltage measurement;
determine, for each respective node in the plurality of nodes:
a respective value of a first voltage-constraint coefficient, based on a respective previous value of the first voltage-constraint coefficient, a respective minimum voltage value for the respective node, and the respective voltage measurement; and
a respective value of a second voltage-constraint coefficient based on a respective previous value of the second voltage-constraint coefficient, a re

Assignees

• Alliance Sustainable Energy
• Delft Univ Of Tech
• Univ Minnesota

Inventors

• Dall'Anese Emiliano
• SIMONETTO Andrea
• Dhople Sairaj

Classifications

• H02J2101/30

  Fuel cells · CPC title

• H02J2101/28

  Wind energy · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• H02J2101/20

  Dispersed power generation using renewable energy sources · CPC title

• H02J13/1321

  using a wired telecommunication network or a data transmission bus · CPC title