Real time voltage regulation through gather and broadcast techniques

• US 10,148,092 B2
• Filed: 01/27/2017
• Issued: 12/04/2018
• Est. Priority Date: 01/27/2016
• Status: Active Grant

• Current Assignee: Alliance For Sustainable Energy LLC, Technische Universiteit Delft, Regents of The University of Minnesota (University of Minnesota)
• Original Assignee: Alliance For Sustainable Energy LLC, Technische Universiteit Delft, Regents of The University of Minnesota (University of Minnesota)
• Inventors: Dall'Anese, Emiliano, Simonetto, Andrea, Dhople, Sairaj
• Primary Examiner(s): Bahta, Kidest
• Application Number:
  US15/418,272
• Publication Number:
  US 20170214244A1
• Time in Patent Office: 676 Days
• CPC Class Codes: H02J 13/00016 using a wired telecommunication network or a data transmission bus
• CPC Class Codes: H02J 2300/20 The dispersed energy generation being of renewable origin
• CPC Class Codes: H02J 2300/24 of photovoltaic origin
• CPC Class Codes: H02J 2300/28 The renewable source being wind energy
• CPC Class Codes: H02J 2300/30 The power source being a fuel cell
• CPC Class Codes: H02J 2300/40 wherein a plurality of decentralised, dispersed or local energy generation technologies are operated simultaneously
• CPC Class Codes: H02J 3/06 Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
• CPC Class Codes: H02J 3/16 by adjustment of reactive power
• CPC Class Codes: H02J 3/32 using batteries with converting means
• CPC Class Codes: H02J 3/381 Dispersed generators
• CPC Class Codes: H02J 3/48 Controlling the sharing of the in-phase component
• CPC Class Codes: H02J 3/50 Controlling the sharing of the out-of-phase component
• CPC Class Codes: Y02B 70/30 Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
• CPC Class Codes: Y02B 70/3225 Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y02E 10/56 Power conversion systems, e.g. maximum power point trackers
• CPC Class Codes: Y02E 10/76 Power conversion electric or electronic aspects
• CPC Class Codes: Y02E 40/30 Reactive power compensation
• CPC Class Codes: Y02E 40/70 Smart grids as climate change mitigation technology in the energy generation sector
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/00 Systems supporting electrical power generation, transmission or distribution
• CPC Class Codes: Y04S 10/12 : Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
• CPC Class Codes: Y04S 10/123 : the energy generation units being or involving renewable energy sources
• CPC Class Codes: Y04S 10/14 : Energy storage units
• CPC Class Codes: Y04S 10/22 : Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
• CPC Class Codes: Y04S 20/221 : General power management systems
• CPC Class Codes: Y04S 20/222 : Demand response systems, e.g. load shedding, peak shaving
• CPC Class Codes: Y04S 40/124 : using wired telecommunication networks or data transmission busses

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.

Claims

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, wherein the respective minimum voltage value for the respective node and the respective maximum voltage value for the respective node represent a defined allowable voltage range at the respective node; 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−

ϵ

γ

_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^kα

(_h^k−

V^max−

ϵ

μ

_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 comprising at least one processor that is 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 respective maximum voltage value for the respective node, and the respective voltage measurement, wherein the respective minimum voltage value for the respective node and the respective maximum voltage value for the respective node represent a defined allowable voltage range at the respective node; and

output 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; and

a plurality of inverter-interfaced energy resource management devices corresponding to a plurality of inverter-interfaced energy resources that are connected to the distribution network, each inverter-interfaced energy resource management device comprising at least one processor that is configured to;

receive 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;

determine, 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, a respective power setpoint value; and

modify a respective output power of a respective inverter-interfaced energy resource from the plurality of inverter-interfaced energy resources, based on the respective power setpoint value.

10. The system of claim 9, wherein at least one of the plurality of inverter-interfaced energy resource management devices comprises a power inverter that couples a respective energy resource to the distribution network.

11. The system of claim 9, wherein at least one of the plurality of inverter-interfaced energy resource management devices comprises a computing device communicatively coupled to a power inverter that couples a respective energy resource to the distribution network.

12. The system of claim 9, wherein:

the at least one processor of at least one of the plurality of inverter-interfaced energy resource management devices is further configured to;

determine an updated value of the respective voltage measurement that corresponds to a resource node, the resource node comprising the respective node at which the respective inverter-interfaced energy resource is connected to the distribution network;

determine, based on the respective value of the first voltage-constraint coefficient for the resource node, the respective minimum voltage value for the resource node, and the updated value of the respective voltage measurement, an updated value of the first voltage-constraint coefficient for the resource node;

determine, based on the respective value of the second voltage-constraint coefficient for the resource node, the respective maximum voltage value for the resource node, and the updated value of the respective voltage measurement, an updated value of the second voltage-constraint coefficient for the resource node;

determine, based on the updated value of the first voltage-constraint coefficient for the resource node, the updated value of the second voltage-constraint coefficient for the resource node, the respective value of the first voltage-constraint coefficient for each respective node other than the resource node, and the respective value of the second voltage-constraint coefficient for each respective node other than the research node, an updated power setpoint value; and

modify the respective output power of the respective inverter-interfaced energy resource based on the updated power setpoint value.

13. The system of claim 12, wherein:

the at least one processor of the plurality of inverter-interfaced energy resource management devices is configured to determine the respective power setpoint value 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 at a first frequency; and

the at least one processor of the at least one of the plurality of inverter-interfaced energy resource management devices is configured to determine the updated value of the respective voltage measurement that corresponds to the resource node at a second frequency that is smaller than the first frequency.

14. The system of claim 12, wherein the at least one processor of the at least one of the plurality of inverter-interfaced energy resource management devices is configured to determine the updated value of the respective voltage measurement that corresponds to the resource node in response to determining that an updated respective value of the first voltage-constraint coefficient for each respective node and an updated respective value of the second voltage-constraint coefficient for each respective node have not been received within a threshold amount of time.

15. The system of claim 9, wherein determining the respective power setpoint value is further based on at least one respective performance metric determined by a respective administrator of the respective inverter-interfaced energy resource.

16. The system of claim 15, wherein the at least one respective performance metric comprises at least one of:

a cost for ancillary service provisioning or feed-in tariffs.

17. The system of claim 9, wherein at least one of the plurality of inverter-interfaced energy resource management devices comprises one of the plurality of voltage measurement devices.

18. A method comprising:

receiving, by a distribution network management system comprising at least one processor, 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;

determining, by the distribution network management system, 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, wherein the respective minimum voltage value for the respective node and the respective maximum voltage value for the respective node represent a defined allowable voltage range at the respective node; and

causing 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.

19. The method of claim 18, wherein causing the at least one inverter-interfaced energy resource to modify the output power comprises 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.

20. The method of claim 18, wherein causing the at least one inverter-interfaced energy resource to modify the output power comprises:

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.