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Islanded-operation assessment report

Island mode runs at fixed frequency only: there is no combined assessment of island power balance, frequency deviation and voltage level.

Wired, not run yetP1All reportsComputing…
Wiring check (verbatim, from the engine source)Wired (specification switch name matches the engine)
PriorityP1
Switch named by the specificationstudyOptions.enableIslandFreqEstimate
Wired verbatim in the engine?yes（3 evidence）
Engine switches that actually produce this reportenableIslandFreqEstimate · enableIslandMode · enableIslandRelayCheck · enableDieselIsland · enablePvActiveIslandCheck · enableRecloseStudy
Report chapters these switches can appendisland-freq-estimate · island-operation · island-relay · diesel-island · pv-active-island · reclose-study
Built-in chapter list (from the specification)The specification asks for 8 chapter(s); the engine can produce 6 of them for this report.
Standards basisIEEE 1547.4; GB/T 33593; GB/T 42731 (microgrid technical requirements).
The specification switch `studyOptions.enableIslandFreqEstimate` IS wired — resolved inside `engines/island-freq-estimate.js`, called from `design.js` (`runIslandFreqEstimateIfEnabled`). The remaining island scope (island power flow, island relay, diesel island, PV active island, reclose) is wired under the additional switches listed below.

evidence · file:line

Wiring check (verbatim, from the engine source) · evidence
  • [Wired verbatim in the engine?] engines/island-freq-estimate.js:78 · const SWITCH_MAIN = 'enableIslandFreqEstimate';
  • [Wired verbatim in the engine?] engines/island-freq-estimate.js:121 · + '检查行 checks[]、unknownReason、打标 flags）。开关 studyOptions.enableIslandFreqEstimate（缺省 false → 零残留）。',
  • [Wired verbatim in the engine?] engines/island-freq-estimate.js:6 · * 开关：studyOptions.enableIslandFreqEstimate（缺省 false；兼容别名见 SWITCH_ALIASES，
  • enableIslandFreqEstimate
    • engines/island-freq-estimate.js:78 · const SWITCH_MAIN = 'enableIslandFreqEstimate';
    • engines/island-freq-estimate.js:121 · + '检查行 checks[]、unknownReason、打标 flags）。开关 studyOptions.enableIslandFreqEstimate（缺省 false → 零残留）。',
    • engines/island-freq-estimate.js:6 · * 开关：studyOptions.enableIslandFreqEstimate（缺省 false；兼容别名见 SWITCH_ALIASES，
  • enableIslandMode
    • design.js:1289 · const wantIsland = SO.enableIslandMode === true;
    • engines/loadflow.js:643 · const switchOn = so.enableIslandMode === true;
    • engines/time-series.js:340 · if (SO.enableIslandMode === true) warnings.push(warnOf('islandCombo', {}));
  • enableIslandRelayCheck
    • engines/island-relay.js:71 · const SWITCH_MAIN = 'enableIslandRelayCheck';
    • engines/island-relay.js:117 · + 'unknownTypes、延时合规 delayCompliant、打标 flags）。开关 studyOptions.enableIslandRelayCheck（缺省 false → 零残留）。',
    • engines/island-relay.js:6 · * 开关：studyOptions.enableIslandRelayCheck（缺省 false；旧名/兼容别名见 SWITCH_ALIASES，
  • enableDieselIsland
    • engines/diesel-island.js:66 · const SWITCH_MAIN = 'enableDieselIsland';
    • engines/diesel-island.js:68 · 'enableDieselIsland', // 任务书字面开关名
    • design.js:1553 · * 开关主名 enableDieselIsland（别名由引擎 DGI.resolveDieselIsland 统一解析）；
  • enablePvActiveIslandCheck
    • engines/pv-active-island.js:107 · const SWITCH_MAIN = 'enablePvActiveIslandCheck';
    • engines/pv-active-island.js:162 · + '开关 studyOptions.enablePvActiveIslandCheck（缺省 false → 零残留）。',
    • engines/pv-active-island.js:7 · * 开关：studyOptions.enablePvActiveIslandCheck（缺省 false；旧名/兼容别名见 SWITCH_ALIASES，由
  • enableRecloseStudy
    • engines/reclose-study.js:119 · const SWITCH_MAIN = 'enableRecloseStudy';
    • engines/reclose-study.js:94 · * 开关：`studyOptions.enableRecloseStudy`（**主名，缺省 false → 产物零残留**；别名见 SWITCH_ALIASES）
    • engines/reclose-study.js:121 · 'enableRecloseStudy', // 主名（任务书字面）
Built-in chapter list (from the specification)8 chapter(s)
  1. 1.Report overview: island-scenario definition, grid-disconnection conditions, model assumptions, applicable standards.
  2. 2.Island system composition: sources inside the microgrid (PV / storage / diesel), load list, control mode (Vf / PQ).
  3. 3.Power balance calculation: active / reactive surplus or deficit in the island.
  4. 4.Quasi-steady-state frequency-deviation estimate: steady-state deviation for different power-imbalance cases.
  5. 5.Island bus-voltage level check and voltage-limit verdict.
  6. 6.Protection-trip verification: whether over / under-frequency and over / under-voltage protection operates in the island case.
  7. 7.Island stable-operation conclusion, power-disturbance tolerance boundary, engineering recommendations.
  8. 8.Appendix: system equivalent inertia / droop parameters, case definitions.
Chapters produced by the engine for this scheme0 / 6

This report has not been run for the current scheme yet.

Nothing is invented: run it, or enable the switches on the relevant tool pages, and the produced chapters appear here.
Conclusions produced for this report0

No conclusion of this report was produced (the report has not been run, or it produced none).

Charts
Required by the specification
  • Power imbalance versus frequency deviation curve
  • Island bus-voltage distribution chart
Produced by the engine (report-charts study)

This report has not been run for the current scheme yet.

Explicitly out of scope (from the specification)4
  • · Quasi-steady-state static frequency estimate only — no differential equations, no frequency-dip trajectory.
  • · No electromechanical transient oscillation or frequency dynamics.
  • · No detail of inverter control-loop dynamic response.
  • · For pre-assessment of a scheme only; it is not a substitute for an on-site island-protection test.

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