# US 9,910,076 B2 · Method and system for analysis of energy savings in an electrical network

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- Number: US 9,910,076 B2
- Document ID: US9910076B2
- Status: Granted
- Kind: B2
- Application number: 14/542,663
- Filed: 2014-11-17
- Published: 2016-05-19
- Granted: 2018-03-06
- Earliest claimed: 2014-11-17
- Assignees: Elspec Engineering Ltd.
- Applicants: Elspec Engineering Ltd.
- Inventors: Yoram Harary; Oren Harary
- Web page: https://patentgrep.com/patent/US9910076B2

## CPC

- G01R 21/133: by using digital technique
- G01R 21/002: {Measuring real component}
- H02J 3/00: Circuit arrangements for AC mains or AC distribution networks
- H02J 3/01: Arrangements for reducing harmonics or ripples
- H02J 3/18: Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J 13/12: Monitoring network conditions, e.g. electrical magnitudes or operational status
- H02J 13/182: the equipment comprising loads connected to the power network
- H02J 13/333: the equipment forming part of substations
- H02J 2103/30: Simulating, planning, modelling, reliability check or computer assisted design [CAD] of electric power networks
- Y02E 40/30: Reactive power compensation
- Y02E 40/40: Arrangements for reducing harmonics
- Y02E 40/70: Smart grids as climate change mitigation technology in the energy generation sector
- Y02E 60/00: Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02P 80/10: Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y04S 10/22: Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units
- Y04S 10/30: State monitoring, e.g. fault, temperature monitoring, insulator monitoring, corona discharge
- Y04S 40/20: Information technology specific aspects, e.g. CAD, simulation, modelling, system security
- G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12)
- H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS

## Abstract

A method for analysis of energy savings in an electrical network includes obtaining measurements of a plurality of measurement devices linked to loads of the electrical network over a first period of time. A unified signature that characterizes the recorded measurements during the first period of time is calculated. Measurements of the plurality of measurement devices in the electrical network are obtained over a second period of time after introduction of a modification into the electrical network. A unified signature that characterizes the recorded measurements during the second period of time is calculated. The unified signature that characterizes the measurements during the second period of time is compared with the unified signature that characterizes the measurements during the first period of time to calculate energy savings resulting from introduction of the modification.

## Claims

### Claim 1

A method for analysis of energy savings in an electrical network, the method comprising:
obtaining measurements by a plurality of measurement devices linked to loads of the electrical network over a first period of time;
calculating a unified signature that characterizes the recorded measurements during the first period of time by combining individual signatures that each relates power consumption by each of the loads to a measured quantity that characterizes that load during the first period of time and that varies during the first period of time;
obtaining measurements of the plurality of measurement devices in the electrical network over a second period of time after introduction of a modification into the electrical network;
calculating a unified signature that characterizes the recorded measurements during the second period of time by combining individual signatures that each relates power consumption by each of the loads to a measured quantity that characterizes that load during the second period of time and that varies during the second period of time; and
comparing the unified signature that characterizes the measurements during the second period of time with the unified signature that characterizes the measurements during the first period of time to calculate energy savings resulting from introduction of the modification.

### Claim 2 (depends on 1)

The method of claim 1, wherein the measurements comprise a measurement of active power consumption or of a load resistance.

### Claim 3 (depends on 1)

The method of claim 1, wherein the unified signature comprises a relationship between active power consumption by the network and a concurrent equivalent resistance of the network.

### Claim 4 (depends on 3)

The method of claim 3, wherein the equivalent resistance is equal to an inverse of a sum of inverses of transformed resistance values of a plurality of loads that are connected to the network, each transformed resistance value including a product of a measured resistance of a load of the plurality of loads and a square of a primary/secondary ratio of a transformer that connects that load to the network.

### Claim 5 (depends on 4)

The method of claim 4, wherein the measured resistances of the plurality of loads are measured concurrently.

### Claim 6 (depends on 3)

The method of claim 3, wherein comparing the unified signatures comprises calculating a representative power difference between the unified signatures.

### Claim 7 (depends on 6)

The method of claim 6, wherein calculating the representative power difference comprises calculating a weighted average of a plurality of power differences in different ranges of the equivalent resistance, each of the plurality of power differences being weighted by a number of measurements that yielded an equivalent resistance value within the corresponding range of the equivalent resistance.

### Claim 8 (depends on 1)

The method of claim 1, wherein the introduced modification comprises introduction of a tuned or detuned reactive power compensator.

### Claim 9 (depends on 1)

The method of claim 1, wherein the introduced modification comprises adjusting a voltage.

### Claim 10 (depends on 1)

The method of claim 1, wherein comparing the unified signatures comprises fitting a curve to at least one of the unified signatures.

### Claim 11 (depends on 1)

The method of claim 1, wherein a length of the first period or the second period is selected to correspond to a periodicity in the operation of the electrical network.

### Claim 12

A method for analysis of energy savings in an electrical network, the method comprising:
obtaining measurements of a plurality of measurement devices linked to loads of the electrical network over a first period of time;
calculating a unified signature that characterizes the recorded measurements during the first period of time by combining individual signatures that each relates power consumption by each of the loads to a measured quantity that characterizes that load during the first period of time and that varies during the first period of time;
simulating predicted measurements of the plurality of measurement devices in the electrical network over a second period of time after introduction of a modification into the electrical network;
calculating a unified signature that characterizes the simulated measurements during the second period of time by combining individual simulated signatures that each relates simulated power consumption by each of the loads to a quantity that characterizes that load during the second period of time and that varies during the second period of time; and
comparing the unified signature that characterizes the measurements during the second period of time with the unified signature that characterizes the measurements during the first period of time to calculate energy savings resulting from introduction of the modification.