Dynamic frequency control in power networks

Patent metadata

Field	Value
Publication number	US-10673232-B2
Application number	US-201514796869-A
Country	US
Kind code	B2
Filing date	Jul 10, 2015
Priority date	Jul 10, 2014
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

Node controllers in power distribution networks in accordance with embodiments of the invention enable dynamic frequency control. One embodiment includes a node controller comprising a network interface a processor; and a memory containing a frequency control application; and a plurality of node operating parameters describing the operating parameters of a node, where the node is selected from a group consisting of at least one generator node in a power distribution network wherein the processor is configured by the frequency control application to calculate a plurality of updated node operating parameters using a distributed process to determine the updated node operating parameter using the node operating parameters, where the distributed process controls network frequency in the power distribution network; and adjust the node operating parameters.

First claim

What is claimed is:

1. A node controller comprising:
a network interface;
a processor; and
a memory containing:
a frequency control application; and
a plurality of node operating parameters describing the operating parameters of a node, where the node is a generator node selected from a group consisting of at least one generator node in a power distribution network;
wherein the processor is configured by the frequency control application to:
calculate a plurality of updated node operating parameters using a distributed process to determine the updated node operating parameters using the node operating parameters,
wherein the updated node operating parameters are determined based o frequency data measured at the node and independently of frequency data calculated based on data from at least another node within the power distribution network,
wherein at least one of the updated node operating parameters are further determined based on a function of both a cost function and of frequency deviations of the node from a nominal frequency that is measured locally at the node,
wherein a feedback control is designed based on the local measurements of frequency deviations and a set of parameters that specify the bounds of control parameters,
where the distributed process controls network frequency subject to a real power injection to the node in the power distribution network; and
adjust the node operating parameters to change the network frequency by controlling the frequency of the node based on the adjusted node operating parameters.

2. The node controller of claim 1 , wherein the node operating parameters include a node frequency.

3. The node controller of claim 1 , wherein the node operating parameters include generator node parameters.

4. The node controller of claim 1 , wherein the node operating parameters include a bounded control variable.

5. The node controller of claim 1 , wherein to calculate a plurality of updated node operating parameters using a distributed process processor using the following expression:

p
j
c

⁡

(

ω
j

)

=

[

(

c
j
′

)

-
1

⁢

(

-

ω
j

)

]

p
_

j

p
_

j

⁢

⁢
j

∈
𝒢

where p c is a frequency control parameter, ω is a frequency, c is a cost or disutility function, p j and p j are bounds on the frequency control parameter, j is the node, and is the at least one generator node.

6. A node controller comprising:
a network interface;
a processor; and
a memory containing:
a frequency control application; and
a plurality of node operating parameters describing the operating parameters of a node, where the node is a load node selected from a group consisting of at least one load node in a power distribution network;
wherein the processor is configured by the frequency control application to:
calculate a plurality of updated node operating parameters using a distributed process to determine the updated node operating parameters using the node operating parameters, wherein the updated node operating parameters are determined based on frequency data measured at the node and independently of frequency data calculated based on data from at least another node within the power distribution network, wherein at least one of the updated node operating parameters are further determined based on a function of both a cost function and of frequency deviations of the node from a nominal frequency that is measured locally at the node, wherein a feedback control is designed based on the local measurements of frequency deviations and a set of parameters that specify the bounds of control parameters, where the distributed process controls network frequency subject to a real power injection to the node in the power distribution network; and
adjust the node operating parameters to change the network frequency by controlling the frequency of the node based on the adjusted node operating parameters.

7. The node controller of claim 6 , wherein the node operating parameters include load node parameters.

8. The node controller of claim 6 , wherein the node operating parameters include a bounded control variable.

9. The node controller of claim 6 , wherein to calculate a plurality of updated node operating parameters using a distributed process is evaluated by the processor using the following expression:

p
j

⁡

(

ω
j

)

=

[

(

c
j
′

)

-
1

⁢

(

-

ω
j

)

]

p
_

j

Assignees

• California Inst Of Techn

Inventors

• Zhao Changhong
• Mallada Garcia Enrique
• Low Steven H

Classifications

• H02J3/04

  Arrangements for connecting networks of the same frequency but supplied from different sources · CPC title

• H02J3/00 Primary

  Circuit arrangements for AC mains or AC distribution networks · CPC title

• H02J3/11 Primary

  Arrangements for adjusting frequency in AC networks, e.g. by control of active power · CPC title