System and method for regulation of voltage on an electric power system

Patent metadata

Field	Value
Publication number	US-10048709-B2
Application number	US-201615269110-A
Country	US
Kind code	B2
Filing date	Sep 19, 2016
Priority date	Sep 19, 2016
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

An electric power system includes an OLTC transformer including a plurality of primary and secondary windings inductively coupled to each other. The electric power system includes at least one on-load tap changer coupled to at least one of the primary and secondary windings that is selectively configurable to regulate the portion of the primary and secondary windings inductively coupled to each other. The electric power system also includes a plurality of buses coupled to the transformer and are positioned downstream therefrom. The electric power system further includes at least one processor coupled to the tap changer configured to regulate a voltage bandwidth of the tap changer as a function of estimated voltage values of at least one bus as estimated based on a priori values of power/current transmitted through each bus. The a priori values are substantially based on measured power/current transmission through the on-load tap changer.

First claim

What is claimed is:

1. An electric power system comprising:
an on-load tap changing (OLTC) transformer comprising a plurality of primary windings and a plurality of secondary windings, at least a portion of said primary windings and at least a portion of said secondary windings inductively coupled to each other;
at least one on-load tap changer coupled to at least one of said plurality of primary windings and coupled to at least one of said plurality of secondary windings, said at least one on-load tap changer selectively configurable to regulate said at least a portion of said primary windings and said at least a portion of said secondary windings that are inductively coupled to each other;
a plurality of buses coupled to said OLTC transformer, said plurality of buses positioned downstream of said OLTC transformer; and
at least one processor coupled to said at least one on-load tap changer, said at least one processor configured to regulate a voltage bandwidth of said on-load tap changer as a function of estimated voltage values of at least one bus of said plurality of buses as estimated based on a priori values of one of power and current transmitted through each bus of said plurality of buses, wherein the a priori values of one of power and current are substantially based on one of measured power and measured current transmission through said on-load tap changer;
wherein said processor is further configured to generate estimations of voltages for said each bus of said plurality of buses.

2. The electric power system in accordance with claim 1 , wherein said processor is further configured to generate uncertainty values associated with one or more of:
the a priori values of one of power and current transmitted through said each bus of said plurality of buses; and
the estimated voltage values of said at least one bus of said plurality of buses.

3. The electric power system in accordance with claim 1 , wherein said processor is further configured to generate, for the a priori values, for said each bus of said plurality of buses one of:
upper power parameters and lower power parameters; and
upper current parameters and lower current parameters.

4. The electric power system in accordance with claim 1 , wherein said processor is further configured to generate the a priori values of one of power and current transmitted through said each bus of said plurality of buses through one or more of clear day solar radiation data and time-of-day data.

5. The electric power system in accordance with claim 4 , wherein said processor is further configured to generate uncertainty values of the a priori values of one of power and current transmitted through said each bus of said plurality of buses through the one or more of clear day solar radiation data and time-of-day data.

6. The electric power system in accordance with claim 1 , wherein said processor is further configured to generate tap position commands for said at least one on-load tap changer at least partially based on the regulated voltage bandwidth of said on-load tap changer.

7. The electric power system in accordance with claim 1 , wherein said processor is further configured to: generate first estimations of voltages for said each bus of said plurality of buses, wherein the first voltage estimations are substantially based on assumptions of worst case voltage drops and voltage rises for said each bus of said plurality of buses; generate second estimations of voltages for said each bus of said plurality of buses, wherein the second voltage estimations are the estimated voltage values of said each bus of said plurality of buses as estimated based on the priori values; and compare the first voltages estimations with the second voltage estimations.

8. A tap changer for an on-load tap changing (OLTC) transformer, the OLTC transformer including a plurality of primary windings and a plurality of secondary windings, the OLTC transformer further including a plurality of taps, each tap of the plurality of taps coupled to a different portion of at least one of the plurality of primary windings and the plurality of secondary windings, the OLTC transformer coupled to a plurality of buses downstream of the OLTC transformer, said tap changer comprising:
a tap selection device configured to selectively engage a portion of said plurality of taps;
a drive device coupled to said tap selection device; and
at least one processor coupled to said drive device, said at least one processor configured to regulate a voltage bandwidth of said on-load tap changer as a function of estimated voltage values of at least one bus of the plurality of buses as estimated based on a priori values of one of power and current transmitted through each bus of the plurality of buses, wherein the a priori values of one of power and current are substantially based on one of measured power and measured current transmission through the OLTC transformer;
wherein said processor is further configured to generate estimations of voltages for each bus of said plurality of buses.

9. The tap changer in accordance with claim 8 , wherein said processor is further configured to generate uncertainty values associated with one or more of:
the a priori values of one of power and current transmitted through each bus of the plurality of buses; and
the estimated voltage values of the at least one bus of the plurality of buses.

10. The tap changer in accordance with claim 8 , wherein said processor is further configured to generate, for the a priori values, for said each bus of said plurality of buses one of:
upper power parameters and lower power parameters; and
upper current parameters and lower current parameters.

11. The tap changer in accordance with claim 8 , wherein said processor is further configured generate the a priori values of one of power and current transmitted through each bus of the plurality of buses through one or more of clear day solar radiation data and time-of-day data.

12. The tap changer in accordance with claim 9 , wherein said processor is further configured to generate uncertainty values of the a priori values of one of power and current transmitted through each bus of the plurality of buses through the one or more of clear day solar radiation data and time-of-day data.

13. The tap changer in accordance with claim 8 , wherein said processor is further configured to generate tap position commands for said tap changer at least partially based on the regulated voltage bandwidth of said on-load tap changer.

14. The electric power system in accordance with claim 8 , wherein said processor is further configured to: generate first estimations of voltages for each bus of the plurality of buses, wherein the first voltage estimations are substantially based on assumptions of worst case voltage drops and voltage rises for each bus of the plurality of buses; generate second estimations of voltages for each bus of the plurality of buses, wherein the second voltage estimations are the estimated voltage values of each bus of the plurality of buses as estimated based on the priori values; and compare the first voltages estimations with the second voltage estimations.

15. A method of regulating a voltage on at least a portion of an electric distribution system, the electric distribution system including at least one on-load tap changing (OLTC) transformer that includes a plurality of primary windings and a plurality of secondary windings and a tap changer configured to regulate an inductive coupling between the plurality of primary windings and the plurality of secondary windings, the tap changer including at least

Assignees

• Gen Electric

Inventors

• Baerthlein Eva-Maria
• Bernal Serra Eva
• Hartung Marianne Luise Susanne
• Panosyan Ara
• Parolini Luca

Classifications

• H02J2103/30

  Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks · CPC title

• H02J2101/28

  Wind energy · CPC title

• H02J2101/24

  Photovoltaics · CPC title

• H02J2101/22

  Solar energy · CPC title

• H02J2101/20

  Dispersed power generation using renewable energy sources · CPC title