# US 2013/0158907 A1 · Resampling a Signal to Perform Power Quality and Synchrophasor Measurement > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0158907 A1 - Document ID: US20130158907A1 - Status: Published application - Kind: A1 - Application number: 13/326,676 - Filed: 2011-12-15 - Published: 2013-06-20 - Earliest claimed: 2011-12-15 - Assignees: National Instruments Corporation - Inventors: Qiao Guo; Chen Zhang; Yijun Shi - Web page: https://patentgrep.com/patent/US20130158907A1 ## CPC - G01R 21/133: by using digital technique - G01R 19/2513: {Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging} - 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 - Y04S 10/00: Systems supporting electrical power generation, transmission or distribution - Y04S 10/22: Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - 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 Performing power quality and synchrophasor analysis on a resampled signal. A first signal may be initially received which corresponds to a power system. The first signal may have a plurality of cycles and may have a frequency that varies over time. One or more parameters may be determined from the first signal. Based on the one or more parameters, the first signal may be resampled to produce an even angle signal. Various power quality measurements may be performed on the even angle signal. Similarly, further processing may be performed to perform synchrophasor measurements, e.g., to determine phasor, frequency, and/or rate of frequency change for the first signal. In some embodiments, the resampling processing elements (e.g., circuitry, programmable hardware elements, processors and memories, etc.) may be shared between the two analyses. ## Claims ### Claim 1 A method for performing synchrophasor and power quality analysis using shared resources, comprising: receiving a first signal from a first power system; resampling the first signal to generate a first even angle signal, wherein said resampling is performed using a first algorithm by a first one or more processing elements; performing one or more power quality measurements on the first even angle signal to perform the power quality analysis; receiving a second signal from a second power system; resampling the second signal to generate a second even angle signal, wherein said resampling is performed using the first algorithm by the first one or more processing elements; and performing one or more synchrophasor measurements on the second even angle signal to perform the synchrophasor analysis. ### Claim 2 (depends on 1) The method of claim 1, wherein the first one or more processing elements comprise circuitry configured to implement at least a portion of the first algorithm. ### Claim 3 (depends on 1) The method of claim 1, wherein the first one or more processing elements comprise a programmable hardware element configured to implement at least a portion of the first algorithm. ### Claim 4 (depends on 1) The method of claim 1, wherein the first one or more processing elements comprise a processor and memory, wherein the memory stores program instructions executable by the processor to implement at least a portion of the first algorithm. ### Claim 5 (depends on 1) The method of claim 1, wherein a frequency of the first signal is variable. ### Claim 6 (depends on 1) The method of claim 1, wherein the first signal corresponds to voltage or current output by a power system. ### Claim 7 (depends on 1) The method of claim 1, wherein said resampling the first signal to generate the first even angle signal comprises: determining one or more parameters of the first signal; wherein said resampling is based on the one or more parameters of the first signal ### Claim 8 (depends on 7) The method of claim 7, wherein said determining one or more parameters comprises: performing zero crossing detection on the first signal, wherein said performing zero crossing detection comprises determining start and end positions of each of the plurality of cycles; and determining even angle positions of the first signal based on the determined start and end positions. ### Claim 9 (depends on 7) The method of claim 7, wherein said determining one or more parameters comprises: analyzing the first signal; and determining a sampling rate based on said analyzing, wherein said resampling is based on the determined sampling rate. ### Claim 10 (depends on 7) The method of claim 7, wherein said determining one or more parameters comprises: filtering the first signal to produce a filtered signal; determining the one or more parameters using the filtered signal. ### Claim 11 A system for performing power measurement, comprising: an input for receiving an analog signal corresponding to a power system; an analog to digital converter (ADC) coupled to the input, wherein the ADC is configured to convert the analog signal to a digital signal; a first processing element coupled to the ADC, wherein the first processing element is configured to: receive the digital signal, wherein the digital signal comprises a plurality of cycles; resample the digital signal using a first algorithm to produce an even angle signal; a second processing element coupled to the first processing element, wherein the second processing element is configured to perform power quality analysis for a first even angle signal provided by the first processing element using the first algorithm; a third processing element coupled to the first processing element, wherein the third processing element is configured to perform synchrophasor analysis for a second even angle signal provided by the first processing element using the first algorithm. ### Claim 12 (depends on 11) The system of claim 11, wherein the system is comprised in a chassis, wherein the chassis comprises a plurality of cards inserted into the chassis, wherein at least one of the first processing element, the second processing element, or the third processing element is implemented on a card inserted into the chassis. ### Claim 13 (depends on 11) The system of claim 11, wherein the first processing element comprises a programmable hardware element, wherein the programmable hardware element is configured to implement at least a portion of said receiving and said resampling. ### Claim 14 (depends on 13) The system of claim 13, wherein the programmable hardware element is configured according to a graphical program, wherein the graphical program comprises a plurality of nodes interconnected by wires which visually indicates functionality of the graphical program. ### Claim 15 (depends on 11) The system of claim 11, wherein the first processing element comprises circuitry, wherein the circuitry is configured to implement at least a portion of said receiving and said resampling. ### Claim 16 (depends on 11) The system of claim 11, wherein the first processing element comprises a processor and memory, wherein the memory stores program instructions executable by the processor to implement at least a portion of said receiving and said resampling. ### Claim 17 (depends on 11) The system of claim 11, wherein the analog signal corresponds to voltage or current output by the power system. ### Claim 18 (depends on 11) The system of claim 11, wherein said resampling the first signal to generate the first even angle signal comprises: determining one or more parameters of the first signal; wherein said resampling is based on the one or more parameters of the first signal ### Claim 19 (depends on 18) The system of claim 18, wherein said determining one or more parameters comprises: performing zero crossing detection on the first signal, wherein said performing zero crossing detection comprises determining start and end positions of each of the plurality of cycles; and determining even angle positions of the first signal based on the determined start and end positions. ### Claim 20 (depends on 18) The system of claim 18, wherein said determining one or more parameters comprises: analyzing the first signal; and determining a sampling rate based on said analyzing, wherein said resampling is based on the determined sampling rate. ### Claim 21 A non-transitory, computer accessible memory medium storing program instructions for performing synchrophasor and power quality analysis using shared resources, wherein the program instructions are executable by a processor to: receive a first signal from a first power system; resample the first signal to generate a first even angle signal, wherein said resampling is performed using a first algorithm by a first one or more processing elements; perform one or more power quality measurements on the first even angle signal to perform the power quality analysis; receive a second signal from a second power system; resample the second signal to generate a second even angle signal, wherein said resampling is performed using the first algorithm by the first one or more processing elements; and perform one or more synchrophasor measurements on the second even angle signal to perform the synchrophasor analysis.