SanPen/GridCal
Nov 2024 – Sep 2025
10 Months active
Languages Used
BinaryGridCalJavaScriptMATLABPythongridcalJSONNumba
Technical Skills
AC/DC Grid SimulationAlgorithm DesignAlgorithm RefinementBackend DevelopmentCode CleanupCode Refactoring
josepfanals
PROFILE
Josepfanals
Joan Fanals developed advanced grid modeling and simulation features for the SanPen/GridCal repository, focusing on AC/DC and HVDC power systems. Over ten months, he engineered robust algorithms for power flow analysis, state estimation, and transformer interoperability, using Python, NumPy, and PySide6. His work included refactoring HVDC calculations, enhancing VSC device modeling, and aligning programmatic controls with the GUI to improve simulation reliability. Joan expanded automated testing, improved data structures, and stabilized the codebase through targeted bug fixes and code cleanup. These efforts resulted in more accurate, maintainable, and user-aligned tools for power systems analysis and planning.
Overall Statistics
Feature vs Bugs
60%Features
Repository Contributions
493Total
Bugs
94
Commits
493
Features
141
Lines of code
150,059
Activity Months10
Your Network
18 people
Work History
September 2025
3 Commits • 1 Features
Sep 1, 2025September 2025 focused on aligning programmatic behavior with the user interface for power-flow simulations and hardening reactive power-sharing calculations in SanPen/GridCal. Key changes include making the default control_q consistent with the GUI (commit aedecba1fafc3eb3726e6ef5c3d995a121cedefe) and fixes to reactive power-sharing (using P instead of Pmax and adding an epsilon to avoid division-by-zero) across patches 32ed328d62b0041cc40a1b14186cbabc25ce80e0 and 7b474c1e9fa3d25e19c8ce2f24f33cc304aea8b1. These updates improve numerical stability, reduce edge-case errors, and enhance reliability of grid studies for operators and planners.
3 Commits • 1 Features
Sep 1, 2025September 2025 focused on aligning programmatic behavior with the user interface for power-flow simulations and hardening reactive power-sharing calculations in SanPen/GridCal. Key changes include making the default control_q consistent with the GUI (commit aedecba1fafc3eb3726e6ef5c3d995a121cedefe) and fixes to reactive power-sharing (using P instead of Pmax and adding an epsilon to avoid division-by-zero) across patches 32ed328d62b0041cc40a1b14186cbabc25ce80e0 and 7b474c1e9fa3d25e19c8ce2f24f33cc304aea8b1. These updates improve numerical stability, reduce edge-case errors, and enhance reliability of grid studies for operators and planners.
September 2025
July 2025
2 Commits
Jul 1, 2025July 2025: Focused on test reliability and codebase health in SanPen/GridCal. No new user-facing features were released this month; instead, I stabilized the test environment by correcting import paths for the Line class in unit tests, eliminating import-time failures and flaky CI results. Two commits standardized test imports to GridCalEngine/Devices/Branches/line, enabling accurate testing of line circuit index setters and smoother onboarding for new contributors. This work improves CI reliability, reduces debugging overhead, and supports a maintainable codebase.
July 2025
2 Commits
Jul 1, 2025July 2025: Focused on test reliability and codebase health in SanPen/GridCal. No new user-facing features were released this month; instead, I stabilized the test environment by correcting import paths for the Line class in unit tests, eliminating import-time failures and flaky CI results. Two commits standardized test imports to GridCalEngine/Devices/Branches/line, enabling accurate testing of line circuit index setters and smoother onboarding for new contributors. This work improves CI reliability, reduces debugging overhead, and supports a maintainable codebase.
June 2025
66 Commits • 16 Features
Jun 1, 2025June 2025 (SanPen/GridCal) delivered substantive modeling enhancements, stability fixes, and autodiff readiness. The work focused on expanding control/data representations, improving numerical accuracy, and laying groundwork for next-phase experimentation while delivering clear business value through more reliable simulations and faster insight. Key feature work broadened VSC/bus modeling, introduced Jacobian preparation, advanced Imax handling, and enhanced data slicing. Post-processing and autodiff capabilities were strengthened to enable more robust analyses and experimentation with future optimization paths. Critical fixes across modules improved correctness, stability, and reliability for ongoing development and production use.
66 Commits • 16 Features
Jun 1, 2025June 2025 (SanPen/GridCal) delivered substantive modeling enhancements, stability fixes, and autodiff readiness. The work focused on expanding control/data representations, improving numerical accuracy, and laying groundwork for next-phase experimentation while delivering clear business value through more reliable simulations and faster insight. Key feature work broadened VSC/bus modeling, introduced Jacobian preparation, advanced Imax handling, and enhanced data slicing. Post-processing and autodiff capabilities were strengthened to enable more robust analyses and experimentation with future optimization paths. Critical fixes across modules improved correctness, stability, and reliability for ongoing development and production use.
June 2025
May 2025
84 Commits • 27 Features
May 1, 2025May 2025 monthly summary for SanPen/GridCal focusing on VSC modeling, GUI integration, and deployment readiness. Delivered core VSC capabilities, data alignment, and visualization enhancements, establishing a solid foundation for solver work and grid-scale deployments. Implemented 3-terminal VSC device definitions, updated data structures, and integrated GUI visualization and movement support. Initiated groundwork for 8-bus grid deployment, HVDC multiterm testing, and currents deployment readiness, while improving maintainability through code cleanup and refactors.
May 2025
84 Commits • 27 Features
May 1, 2025May 2025 monthly summary for SanPen/GridCal focusing on VSC modeling, GUI integration, and deployment readiness. Delivered core VSC capabilities, data alignment, and visualization enhancements, establishing a solid foundation for solver work and grid-scale deployments. Implemented 3-terminal VSC device definitions, updated data structures, and integrated GUI visualization and movement support. Initiated groundwork for 8-bus grid deployment, HVDC multiterm testing, and currents deployment readiness, while improving maintainability through code cleanup and refactors.
April 2025
36 Commits • 8 Features
Apr 1, 2025April 2025 monthly performance summary for SanPen/GridCal. Delivered a set of targeted features and stability fixes that enhanced state estimation accuracy, merge logic, UI consistency, and core power-flow reliability, while expanding test coverage and improving code maintainability. The work focused on enabling MVA-based power handling, robust snapshot merging, and clearer data structures, enabling faster debugging and more trustworthy simulations.
36 Commits • 8 Features
Apr 1, 2025April 2025 monthly performance summary for SanPen/GridCal. Delivered a set of targeted features and stability fixes that enhanced state estimation accuracy, merge logic, UI consistency, and core power-flow reliability, while expanding test coverage and improving code maintainability. The work focused on enabling MVA-based power handling, robust snapshot merging, and clearer data structures, enabling faster debugging and more trustworthy simulations.
April 2025
March 2025
58 Commits • 15 Features
Mar 1, 2025March 2025 (2025-03) — SanPen/GridCal monthly highlights. The team delivered robust deletion and line/substation management improvements, expanded substation merging capabilities, and UX/modeling enhancements that collectively improve reliability, data integrity, and modeling fidelity for grid simulations. Key features delivered: - Removed injection from the diagram on delete, ensuring diagram consistency (commits f701d7ce8284bcd589f60044f210f4444143a0d5; 4dd059cdb2b57ba854ce83cb346c3c2c96fa5393). - Substation merging and linking with line reassignment and code merging support (commits cbade1b5306ca997667f3a8923601518d10e3c1c; 00a79d01d9d5b2b510f9c7c78cd2114df531a700; 9ad034b899001bdb02e23632789d3a02e69823b6; 350cc9ec2faeef84acf0bfa55bfd872657843ceb). - Added code label field when creating substation (PySide6 6.7.2) (commits 926f373732a139fa2a79ce1cf8515468fda86ad7; 433bddc5a9a154dcaeef75c6c2906195b2a6ec2d). - Line splitting enhancements: first functional line for substation merging and keeping .code with length computation via contextual menu (commits 1f3173883e7d0e90f68032ecc14af8ed4656c228; 5ced61cf20bcdedd6f064d707f390e6b0dea2306; 3cd1718a1fd9bca09476b1442130ddc4d55f5152; 2b6264e906a6d4dc783d3711517e81df6a411e4c). - T Joint/In-Out functionality and waypoint selection enhancements (commits d6b4f0ffc4e9cc2790b9d47d4035473c3e19a0b8; 0538a4988c2f2adac455fbb0a87194efa421c060; f7008ff66128bd89271d34cd1224a7864f9dd812; 66bc185c2afac2c35531d768d18fcd0f75c49ba9; ac953a2dc78de93a4a0d0c8968f60ad52042008b). Major bugs fixed: - Improved deletes with generators focus. - Substation link validation on Vnom mismatch. - Fix T joint operation by selecting a waypoint. - Tower template apply error and GUI-related stability issues (commits 9c0c6b3ff77a46a740f9a377b21fa1aa8422f0af; edd30564acc156e776b7712e37e25ab19bb250b8; 7259a7cda7524c01d60c5d50c023661b27c463b4; 9877814e8a111467fa744770191e4e25984d5eb1; 5715fd697552a4d834a09899b4b2c68e119901aa; da7447551f0915232a08e06d2ece51cda7e7807e). - GUI polish: Fix GUI Todos rendering/behavior and ensuring line scene cleanup on device removals (commits 6f61a2b89b49d28b071e89b90c12911cd796b646; 1958a3fd2fa173d31b77ee4b9c50dfc0bfaf658c; c8984a25d4e32a368d71a93eec68359cd574c603; 73536f2e7c1214c1184d9032d275e37e2156f4ab; 76591d7c24cbaf2677098483c52b7134c49c2ad8; 35e0535e97fca9a8d1a505a6089ce1f43f09379f). Overall impact and accomplishments: - Significantly strengthened data integrity and model fidelity by hardening deletion, merging, and line-substation workflows, reducing manual remediation and preventing orphaned components. - Expanded modeling capabilities and user workflows (line splitting, T joints, in-out handling) with UX improvements that streamline common patterns used in grid design and analysis. - Incremental improvements in power-flow accuracy and computation robustness, aligning results with real-world constraints (Vnom handling, switches in branches, and matrix ordering). Technologies/skills demonstrated: - PySide6 UI enhancements and builder UX, complex diagram interactions, and contextual menus. - Advanced modeling logic for substation merging, line management, and T joints/in-out flows. - Robust testing/validation mindset evidenced by commits around edge cases and GUI reliability.
March 2025
58 Commits • 15 Features
Mar 1, 2025March 2025 (2025-03) — SanPen/GridCal monthly highlights. The team delivered robust deletion and line/substation management improvements, expanded substation merging capabilities, and UX/modeling enhancements that collectively improve reliability, data integrity, and modeling fidelity for grid simulations. Key features delivered: - Removed injection from the diagram on delete, ensuring diagram consistency (commits f701d7ce8284bcd589f60044f210f4444143a0d5; 4dd059cdb2b57ba854ce83cb346c3c2c96fa5393). - Substation merging and linking with line reassignment and code merging support (commits cbade1b5306ca997667f3a8923601518d10e3c1c; 00a79d01d9d5b2b510f9c7c78cd2114df531a700; 9ad034b899001bdb02e23632789d3a02e69823b6; 350cc9ec2faeef84acf0bfa55bfd872657843ceb). - Added code label field when creating substation (PySide6 6.7.2) (commits 926f373732a139fa2a79ce1cf8515468fda86ad7; 433bddc5a9a154dcaeef75c6c2906195b2a6ec2d). - Line splitting enhancements: first functional line for substation merging and keeping .code with length computation via contextual menu (commits 1f3173883e7d0e90f68032ecc14af8ed4656c228; 5ced61cf20bcdedd6f064d707f390e6b0dea2306; 3cd1718a1fd9bca09476b1442130ddc4d55f5152; 2b6264e906a6d4dc783d3711517e81df6a411e4c). - T Joint/In-Out functionality and waypoint selection enhancements (commits d6b4f0ffc4e9cc2790b9d47d4035473c3e19a0b8; 0538a4988c2f2adac455fbb0a87194efa421c060; f7008ff66128bd89271d34cd1224a7864f9dd812; 66bc185c2afac2c35531d768d18fcd0f75c49ba9; ac953a2dc78de93a4a0d0c8968f60ad52042008b). Major bugs fixed: - Improved deletes with generators focus. - Substation link validation on Vnom mismatch. - Fix T joint operation by selecting a waypoint. - Tower template apply error and GUI-related stability issues (commits 9c0c6b3ff77a46a740f9a377b21fa1aa8422f0af; edd30564acc156e776b7712e37e25ab19bb250b8; 7259a7cda7524c01d60c5d50c023661b27c463b4; 9877814e8a111467fa744770191e4e25984d5eb1; 5715fd697552a4d834a09899b4b2c68e119901aa; da7447551f0915232a08e06d2ece51cda7e7807e). - GUI polish: Fix GUI Todos rendering/behavior and ensuring line scene cleanup on device removals (commits 6f61a2b89b49d28b071e89b90c12911cd796b646; 1958a3fd2fa173d31b77ee4b9c50dfc0bfaf658c; c8984a25d4e32a368d71a93eec68359cd574c603; 73536f2e7c1214c1184d9032d275e37e2156f4ab; 76591d7c24cbaf2677098483c52b7134c49c2ad8; 35e0535e97fca9a8d1a505a6089ce1f43f09379f). Overall impact and accomplishments: - Significantly strengthened data integrity and model fidelity by hardening deletion, merging, and line-substation workflows, reducing manual remediation and preventing orphaned components. - Expanded modeling capabilities and user workflows (line splitting, T joints, in-out handling) with UX improvements that streamline common patterns used in grid design and analysis. - Incremental improvements in power-flow accuracy and computation robustness, aligning results with real-world constraints (Vnom handling, switches in branches, and matrix ordering). Technologies/skills demonstrated: - PySide6 UI enhancements and builder UX, complex diagram interactions, and contextual menus. - Advanced modeling logic for substation merging, line management, and T joints/in-out flows. - Robust testing/validation mindset evidenced by commits around edge cases and GUI reliability.
February 2025
4 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for SanPen/GridCal: Focused on transformer impedance and parameter accuracy for cross-tool conversions (PSSE and PowerFactory) and on expanding validation coverage. Implemented and stabilized tests for PowerFactory transformer conversions, with multiple commits showing the test working reliably. Initiated PSSE transformer conversion validation; ongoing work to standardize across-trafos variants, as reflected by the PSSE-related commits. Additionally, added tests to validate shunt/admittance calculations as part of conversion validation. Key achievements: improved cross-tool transformer modeling accuracy, expanded automated testing, and progressed toward reliable PSSE/PowerFactory interoperability. Major bugs fixed: none documented in this period. Overall impact and accomplishments: enhances the reliability and accuracy of Transformer models in GridCal when used with external tools, reducing validation risk for grid studies and enabling faster, more trustworthy planning workflows. Demonstrates strong testing discipline and cross-tool integration capabilities. Technologies/skills demonstrated: cross-tool data alignment, test-driven development, automated validation pipelines, Python-based testing, and improved handling of transformer impedance, shunt, and admittance calculations.
4 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for SanPen/GridCal: Focused on transformer impedance and parameter accuracy for cross-tool conversions (PSSE and PowerFactory) and on expanding validation coverage. Implemented and stabilized tests for PowerFactory transformer conversions, with multiple commits showing the test working reliably. Initiated PSSE transformer conversion validation; ongoing work to standardize across-trafos variants, as reflected by the PSSE-related commits. Additionally, added tests to validate shunt/admittance calculations as part of conversion validation. Key achievements: improved cross-tool transformer modeling accuracy, expanded automated testing, and progressed toward reliable PSSE/PowerFactory interoperability. Major bugs fixed: none documented in this period. Overall impact and accomplishments: enhances the reliability and accuracy of Transformer models in GridCal when used with external tools, reducing validation risk for grid studies and enabling faster, more trustworthy planning workflows. Demonstrates strong testing discipline and cross-tool integration capabilities. Technologies/skills demonstrated: cross-tool data alignment, test-driven development, automated validation pipelines, Python-based testing, and improved handling of transformer impedance, shunt, and admittance calculations.
February 2025
January 2025
8 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for SanPen/GridCal focused on delivering HVDC and generalized power-flow enhancements, stabilizing the grid model, and expanding debugging capabilities. The month saw a set of coordinated features and a critical bug fix that improved accuracy, visibility, and reliability for HVDC and large-grid simulations, enabling safer planning and faster validation.
January 2025
8 Commits • 3 Features
Jan 1, 2025January 2025 monthly summary for SanPen/GridCal focused on delivering HVDC and generalized power-flow enhancements, stabilizing the grid model, and expanding debugging capabilities. The month saw a set of coordinated features and a critical bug fix that improved accuracy, visibility, and reliability for HVDC and large-grid simulations, enabling safer planning and faster validation.
December 2024
70 Commits • 23 Features
Dec 1, 2024December 2024 for SanPen/GridCal focused on reliability, performance, and modeling accuracy across HVDC/ACDC workflows and derivative tooling. Key deliveries strengthened grid modeling capabilities, validated core scenarios, and accelerated simulations, enabling faster iterations and more trustworthy results for planning and operations.
70 Commits • 23 Features
Dec 1, 2024December 2024 for SanPen/GridCal focused on reliability, performance, and modeling accuracy across HVDC/ACDC workflows and derivative tooling. Key deliveries strengthened grid modeling capabilities, validated core scenarios, and accelerated simulations, enabling faster iterations and more trustworthy results for planning and operations.
December 2024
November 2024
162 Commits • 47 Features
Nov 1, 2024November 2024 (Month: 2024-11) – SanPen/GridCal delivered substantial enhancements in data modeling, HVDC/branch control capabilities, and integration scaffolding, underpinned by improved indexing and test coverage. The work focused on scalable grid analysis, reliability, and business value through clearer data definitions and more capable HVDC/VSC modeling.
November 2024
162 Commits • 47 Features
Nov 1, 2024November 2024 (Month: 2024-11) – SanPen/GridCal delivered substantial enhancements in data modeling, HVDC/branch control capabilities, and integration scaffolding, underpinned by improved indexing and test coverage. The work focused on scalable grid analysis, reliability, and business value through clearer data definitions and more capable HVDC/VSC modeling.
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Quality Metrics
Correctness83.0%
Maintainability82.0%
Architecture78.2%
Performance72.4%
AI Usage20.8%
Skills & Technologies
Programming Languages
BinaryC++ExcelGridCalGridScriptJSONJavaScriptMATLABNumbaPySide6
Technical Skills
AC/DC Grid SimulationAC/DC Power FlowAPI DevelopmentAPI IntegrationAlgorithm DesignAlgorithm OptimizationAlgorithm RefinementAutomatic DifferentiationBackend DevelopmentBug FixBug FixingClass InheritanceCode AnalysisCode CleanupCode Optimization
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