powsybl/powsybl-open-rao
Aug 2025 – Apr 2026
9 Months active
Languages Used
JavaMarkdownPythonShellXMLGherkinJSON
Technical Skills
API DesignBackend DevelopmentCode AnalysisJavaRefactoringSystem Design
CHEN Roxane
PROFILE
Chen Roxane
Roxane Chen developed and enhanced core features for the powsybl-open-rao repository, focusing on power systems simulation, data integrity, and optimization workflows. Over nine months, she delivered robust solutions such as dynamic setpoint resolution for HVDC actions, flexible generator scheduling, and Ampere-based sensitivity analysis, addressing both operational accuracy and maintainability. Roxane applied Java and Python to implement backend logic, data validation, and algorithm optimization, while strengthening test coverage with Cucumber and unit tests. Her work modernized data ingestion pipelines, improved release management, and reduced operational risk, demonstrating depth in backend development, system design, and power systems engineering within a complex codebase.
Overall Statistics
Feature vs Bugs
79%Features
Repository Contributions
47Total
Bugs
6
Commits
47
Features
23
Lines of code
46,842
Activity Months9
Your Network
70 peopleSame Organization
@rte-france.com57
Work History
April 2026
3 Commits • 2 Features
Apr 1, 2026April 2026: Implemented core data-path modernization and scheduling flexibility in powsybl-open-rao, delivering stronger data integrity for ICS ingestion and more efficient time-coupled generator scheduling. These changes reduce maintenance burden, enable downstream processes with reliable data, and improve resource utilization in time-constrained scenarios.
3 Commits • 2 Features
Apr 1, 2026April 2026: Implemented core data-path modernization and scheduling flexibility in powsybl-open-rao, delivering stronger data integrity for ICS ingestion and more efficient time-coupled generator scheduling. These changes reduce maintenance burden, enable downstream processes with reliable data, and improve resource utilization in time-constrained scenarios.
April 2026
March 2026
9 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary for powsybl-open-rao. Focused on delivering core monitoring capabilities, stabilizing the monitoring pipeline, and preparing release readiness. Work spanned feature development, correctness fixes, and build/release housekeeping, with measurable business value in reliability, performance, and planning for next releases.
March 2026
9 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary for powsybl-open-rao. Focused on delivering core monitoring capabilities, stabilizing the monitoring pipeline, and preparing release readiness. Work spanned feature development, correctness fixes, and build/release housekeeping, with measurable business value in reliability, performance, and planning for next releases.
February 2026
2 Commits • 1 Features
Feb 1, 2026February 2026: Focused on improving reliability and accuracy of remedial action (RA) optimization in powsybl-open-rao. Delivered a linear optimization threshold to prevent false activations in range actions and added robust tests for RA usage limit (1 RA) in curative scenarios. These changes reduce risk of suboptimal decisions, improve optimization stability, and increase test coverage across RA decision pathways.
2 Commits • 1 Features
Feb 1, 2026February 2026: Focused on improving reliability and accuracy of remedial action (RA) optimization in powsybl-open-rao. Delivered a linear optimization threshold to prevent false activations in range actions and added robust tests for RA usage limit (1 RA) in curative scenarios. These changes reduce risk of suboptimal decisions, improve optimization stability, and increase test coverage across RA decision pathways.
February 2026
January 2026
12 Commits • 4 Features
Jan 1, 2026January 2026: Delivered unit-consistent sensitivity analysis and HVDC/AC emulation improvements in powsybl-open-rao, along with RAO parameter versioning and targeted quality fixes. Key achievements include Ampere-based PTDF sensitivities and loopflow calculations with aligned units to the objective function, HVDC/AC emulation compatibility and unit handling refinements, RAO parameter version update to 3.3 with flow-unit support and test tagging, a CriticalBranchReader fix for zero thresholds to improve constraint accuracy, and performance improvements in sensitivity analysis through code cleanup and path optimizations. These efforts enhanced modeling accuracy, ensured safer cross-domain analyses (AC/DC/HVDC), strengthened test coverage, and delivered measurable performance gains. Technologies demonstrated: C++ development, unit handling and conversions, sensitivity analysis techniques, loopflow computation, parameter versioning, and robust testing.]
January 2026
12 Commits • 4 Features
Jan 1, 2026January 2026: Delivered unit-consistent sensitivity analysis and HVDC/AC emulation improvements in powsybl-open-rao, along with RAO parameter versioning and targeted quality fixes. Key achievements include Ampere-based PTDF sensitivities and loopflow calculations with aligned units to the objective function, HVDC/AC emulation compatibility and unit handling refinements, RAO parameter version update to 3.3 with flow-unit support and test tagging, a CriticalBranchReader fix for zero thresholds to improve constraint accuracy, and performance improvements in sensitivity analysis through code cleanup and path optimizations. These efforts enhanced modeling accuracy, ensured safer cross-domain analyses (AC/DC/HVDC), strengthened test coverage, and delivered measurable performance gains. Technologies demonstrated: C++ development, unit handling and conversions, sensitivity analysis techniques, loopflow computation, parameter versioning, and robust testing.]
December 2025
5 Commits • 3 Features
Dec 1, 2025Month: 2025-12 — powsybl-open-rao monthly summary focusing on onboarding, release readiness, and test robustness. Key features delivered include: 1) User Documentation Enhancement: Tutorial and Setup Guide updated to reflect changes in project setup and dependencies, improving onboarding and clarity for users (commit b54713d93631c03a5b8bc37f00da8cb024b2c8db). 2) Release Versioning and Development Cycle Updates: Bump versions to 7.1.0 across modules signaling a stable release and start 7.2.0-SNAPSHOT development (commits d701115b303da9efe8789a643ed711937dc0148f and 3ba92523f071cbc2c0d3e330bc4b1ebbe8bb10c2). 3) Expanded Testing for RAO Flow Values: Enhance testing with side-based checks and retrieval methods (commit e15f76662e92ca7a172f41b015433222b4bf3882). Major bugs fixed: Marmot Export Reliability Fix ensuring ZipOutputStream is closed, with unit tests, safe write operations, and validation (commit 06c3a3229c7303ee4955cb54f2292e628c1dc40c). Overall impact and accomplishments: Accelerated onboarding, improved release readiness, and stronger test coverage, resulting in higher reliability of exports and reduced deployment risk. Technologies/skills demonstrated: Java, test automation, documentation practices, semantic versioning and release management, zip stream handling, and robust unit/integration tests.
5 Commits • 3 Features
Dec 1, 2025Month: 2025-12 — powsybl-open-rao monthly summary focusing on onboarding, release readiness, and test robustness. Key features delivered include: 1) User Documentation Enhancement: Tutorial and Setup Guide updated to reflect changes in project setup and dependencies, improving onboarding and clarity for users (commit b54713d93631c03a5b8bc37f00da8cb024b2c8db). 2) Release Versioning and Development Cycle Updates: Bump versions to 7.1.0 across modules signaling a stable release and start 7.2.0-SNAPSHOT development (commits d701115b303da9efe8789a643ed711937dc0148f and 3ba92523f071cbc2c0d3e330bc4b1ebbe8bb10c2). 3) Expanded Testing for RAO Flow Values: Enhance testing with side-based checks and retrieval methods (commit e15f76662e92ca7a172f41b015433222b4bf3882). Major bugs fixed: Marmot Export Reliability Fix ensuring ZipOutputStream is closed, with unit tests, safe write operations, and validation (commit 06c3a3229c7303ee4955cb54f2292e628c1dc40c). Overall impact and accomplishments: Accelerated onboarding, improved release readiness, and stronger test coverage, resulting in higher reliability of exports and reduced deployment risk. Technologies/skills demonstrated: Java, test automation, documentation practices, semantic versioning and release management, zip stream handling, and robust unit/integration tests.
December 2025
November 2025
5 Commits • 4 Features
Nov 1, 2025November 2025 - powsybl-open-rao: Delivered critical HVDC and network action enhancements, fixed a load-flow parameter handling bug, and updated documentation and contributor processes. The work improved robustness of power-flow simulations, enabled HVDC operation and auditing, and strengthened onboarding and code quality.
November 2025
5 Commits • 4 Features
Nov 1, 2025November 2025 - powsybl-open-rao: Delivered critical HVDC and network action enhancements, fixed a load-flow parameter handling bug, and updated documentation and contributor processes. The work improved robustness of power-flow simulations, enabled HVDC operation and auditing, and strengthened onboarding and code quality.
October 2025
7 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for powsybl-open-rao: Delivered three core outcomes that advance simulation flexibility, data processing efficiency, and release readiness. Key achievements include enabling flexible DC load flow with HVDC AC emulation coexistence, optimizing IDCC data processing efficiency, and strengthening release management and build hygiene to improve release readiness and documentation alignment.
7 Commits • 3 Features
Oct 1, 2025October 2025 monthly summary for powsybl-open-rao: Delivered three core outcomes that advance simulation flexibility, data processing efficiency, and release readiness. Key achievements include enabling flexible DC load flow with HVDC AC emulation coexistence, optimizing IDCC data processing efficiency, and strengthening release management and build hygiene to improve release readiness and documentation alignment.
October 2025
September 2025
2 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for powsybl-open-rao: Implemented Redispatching Actions Configuration and Validation with a data integrity check to filter out actions referencing disconnected generators or loads. This work, accompanied by updated documentation guidelines, reduces misconfigurations and enhances reliability of redispatching workflows. A bug fix prevents invalid actions from being applied, improving data quality and operational safety. Technologies leveraged included: code-level data validation, commit hygiene, and documentation practices; business value: lowers outage risk, saves operator time, and improves decision quality for network redispatching.
September 2025
2 Commits • 1 Features
Sep 1, 2025September 2025 monthly summary for powsybl-open-rao: Implemented Redispatching Actions Configuration and Validation with a data integrity check to filter out actions referencing disconnected generators or loads. This work, accompanied by updated documentation guidelines, reduces misconfigurations and enhances reliability of redispatching workflows. A bug fix prevents invalid actions from being applied, improving data quality and operational safety. Technologies leveraged included: code-level data validation, commit hygiene, and documentation practices; business value: lowers outage risk, saves operator time, and improves decision quality for network redispatching.
August 2025
2 Commits • 2 Features
Aug 1, 2025In 2025-08, two high-impact features were delivered in powsybl-open-rao, significantly improving data integrity and safety for critical grid actions. CRAC v2.8 enables dynamic setpoint resolution by removing the initialSetpoint field and deriving setpoints from the network during deserialization, reducing redundancy and improving consistency for HVDC, Injection, and Counter Trade range actions. A new MW threshold warning for AC load flow was introduced, with a detection utility and unit tests to prevent incoherent results during simulations. No major bugs were recorded this month. Overall, these changes strengthen reliability, data fidelity, and testing coverage, translating to measurable business value in operational decisions and simulation outcomes.
2 Commits • 2 Features
Aug 1, 2025In 2025-08, two high-impact features were delivered in powsybl-open-rao, significantly improving data integrity and safety for critical grid actions. CRAC v2.8 enables dynamic setpoint resolution by removing the initialSetpoint field and deriving setpoints from the network during deserialization, reducing redundancy and improving consistency for HVDC, Injection, and Counter Trade range actions. A new MW threshold warning for AC load flow was introduced, with a detection utility and unit tests to prevent incoherent results during simulations. No major bugs were recorded this month. Overall, these changes strengthen reliability, data fidelity, and testing coverage, translating to measurable business value in operational decisions and simulation outcomes.
August 2025
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Quality Metrics
Correctness92.4%
Maintainability87.2%
Architecture87.2%
Performance85.4%
AI Usage26.8%
Skills & Technologies
Programming Languages
GherkinJSONJavaMarkdownPythonShellXML
Technical Skills
API DesignAPI DevelopmentAPI developmentAlgorithm DesignAlgorithm OptimizationBackend DevelopmentBuild ManagementBuild ToolsCode AnalysisCode RefactoringCucumberData ExportData ImportData ProcessingData Structures
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