{"schemaVersion":1,"slug":"microgrid-bus-voltage-deviation-monitor","name":"Microgrid bus-voltage deviation monitor","kind":"symbol","abbreviation":"MBDM","aliases":["Microgrid voltage and reactive-power controls","microgrids Microgrid voltage and reactive-power controls","microgrids","Microgrids","Bus voltage and reference","Voltage deviation information"],"category":"microgrid-systems","drawingTypes":["Schematic"],"referenceFamilies":["Manufacturer"],"summary":"Reports the difference between the monitored bus voltage and its assigned reference.","description":["Reports the difference between the monitored bus voltage and its assigned reference. Voltage and reactive-power control coordinate the AC operating condition of the microgrid resources. A voltage target, reactive-power target and power-factor target represent different control objectives and should have explicit ownership.","In an islanded microgrid, the assigned reference source supports bus voltage while other compatible resources share reactive demand according to the selected control method. Grid-connected operation can use a different objective at the PCC. For this reference, the drawing identifies “Bus voltage and reference” at the input and “Voltage deviation information” at the output. Measurement location matters.","Show each measured quantity, target and resource capability limit. Control-loop tuning, equipment capability and parallel operation require a validated design rather than an assumed property of the symbol. The functional block is an independent explanation of this named application. Equipment-specific ratings, terminal connections and operating conditions must be established in the project documentation."],"readingNotes":["Start at the named input: Bus voltage and reference. Identify its source device or document and the state represented on the drawing.","Follow the named output: Voltage deviation information. Cross-reference its destination and separate the command from confirmation that the equipment responded.","Measurement location matters.","Show each measured quantity, target and resource capability limit. Control-loop tuning, equipment capability and parallel operation require a validated design rather than an assumed property of the symbol."],"drawingChecklist":["Label the source and connection reference for bus voltage and reference.","Identify the destination and defined state of voltage deviation information.","Record the equipment or control-document revision supporting this functional block.","Check this application limit in the project design: Measurement location matters."],"distinction":"Measurement location matters. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.","facts":[{"label":"Representation","value":"Functional block"},{"label":"Installation focus","value":"Microgrids"},{"label":"Input / boundary","value":"Bus voltage and reference"},{"label":"Output / connection","value":"Voltage deviation information"},{"label":"Lookup label","value":"MBDM is a library lookup label, not a standard device designation."}],"references":[{"sourceId":"pi26-mg-power","relevance":"Public technical context for microgrid voltage and reactive-power controls. Active and reactive power, generation, load control, operating reserves and system supervision. The application text and educational graphic are independently authored; the publisher does not certify this representation."}],"related":["grid-forming-inverter","statcom","microgrid-voltage-control-mode-selector"],"artwork":"pi26-microgrid-bus-voltage-deviation-monitor","publishedOn":"2026-11-03","updatedOn":"2026-11-03","provenance":"independent-public-research","representation":{"type":"functional-block","focus":"microgrids","family":"microgrid-reactive","input":"Bus voltage and reference","output":"Voltage deviation information"},"plainEnglish":{"title":"What this block does","introduction":"Reports the difference between the monitored bus voltage and its assigned reference.","example":"In an islanded microgrid, the assigned reference source supports bus voltage while other compatible resources share reactive demand according to the selected control method. Grid-connected operation can use a different objective at the PCC. For this reference, the drawing identifies “Bus voltage and reference” at the input and “Voltage deviation information” at the output. Measurement location matters.","drawings":"Start at the named input: Bus voltage and reference. Identify its source device or document and the state represented on the drawing. Follow the named output: Voltage deviation information. Cross-reference its destination and separate the command from confirmation that the equipment responded.","terms":[{"name":"Input","meaning":"Bus voltage and reference"},{"name":"Output","meaning":"Voltage deviation information"},{"name":"Application reference","meaning":"An explanation of a named drawing function or circuit relationship; the project documents define the equipment and its connections."}],"diagram":"flow","steps":["Bus voltage and reference","MBDM","Voltage deviation information"],"caption":"A reading guide. The entry's original illustration and input/output facts describe this application.","sources":[{"label":"Microgrid control systems","url":"https://selinc.com/services/microgrids-power-management/microgrid-control-systems/"}],"profileId":"power-installation-microgrid-reactive"},"url":"https://eloragrid.ai/symbols/microgrid-bus-voltage-deviation-monitor","illustration":{"url":"https://eloragrid.ai/tools/electrical-library/illustrations/microgrid-bus-voltage-deviation-monitor.svg","scope":"Original educational concept; not an official standard graphic or product footprint","license":"https://creativecommons.org/licenses/by/4.0/"},"sources":[{"id":"pi26-mg-power","publisher":"SEL","title":"Microgrid control systems","url":"https://selinc.com/services/microgrids-power-management/microgrid-control-systems/","scope":"Active and reactive power, generation, load control, operating reserves and system supervision.","type":"manufacturer","checkedOn":"2026-11-03","reuse":"link-only","relevance":"Public technical context for microgrid voltage and reactive-power controls. Active and reactive power, generation, load control, operating reserves and system supervision. The application text and educational graphic are independently authored; the publisher does not certify this representation."}]}