Microgrid Controller Development Firmware Engineer - Morrisville/Raleigh, NC Delta Electronics (Americas) Ltd. - 3.7 Morrisville, NC Job Details Full-time 5 hours ago Qualifications MATLAB Software engineering Content creation for technical audiences Test Case Documentation (Quality assurance practices) Embedded systems Electronics test plan development Control system design Modbus Network protocols Simulink RTOS Software documentation Developing automated testing protocols Embedded C Technical writing experience within technology Microcontroller programming Python Test Planning (Quality assurance practices)

Full Job Description Who We Are:

Delta, founded in 1971, is a global provider of power and thermal management solutions. Its mission statement, "To provide innovative, clean and energy-efficient solutions for a better tomorrow," focuses on addressing key environmental issues such as global climate change. As an energy-saving solutions provider with core competencies in power electronics and automation, Delta's business categories include Power Electronics, Mobility, Automation, and Infrastructure. At Delta, we're leading the energy transition with innovative solutions in solar inverters, energy storage systems, and EV charging infrastructure. Our technologies are helping utilities, businesses, and communities decarbonize and build resilient, intelligent energy ecosystems. Join us in creating a cleaner, smarter energy future. Role Summary You will own the design and in-house development of the real-time control software that runs on the Microgrid Controller (MGC). This role sits at the intersection of power-electronics control theory and deterministic embedded software, building the droop / grid-forming / grid-following, dispatch, mode-transition, and protection logic that coordinates PCS, BESS, PV, and genset assets. You will bring hands-on knowledge of industry-grade controllers and translate control laws into safe, bounded, real-time code verified on HIL.

Key Responsibilities:

Develop the MGC real-time control application on a deterministic RTOS/RT-Linux target — droop/VSG, PLL, GFM/GFL reference generation, P/Q dispatch, and bumpless mode transitions within 1 ms loops Implement secondary control (P-f and Q-V droop, virtual inertia, SOC-aware allocation, ramp-rate limiting, black-start sequencing, resynchronization) at the 1-100 ms layer Build protection coordination logic (50/51, 27/59, 81/81R, anti-islanding, interlock state machine, GOOSE fast trip/block) with hardware trip paths executing in 20 µs Design and tune power-electronics control loops interfacing to

PCS/BESS

unit controllers; validate stability, ride-through (LVRT/HVRT), and grid-fault behavior Configure and program industry controllers Implement deterministic comms and middleware —

IEC 61850

GOOSE/MMS/SV, Modbus

TCP, DNP3, PTP

(IEEE 1588), lock-free IPC (DDS / shared-memory SPSC queues), with no dynamic allocation on the RT path Verify all functions on HIL (Typhoon HIL, OPAL-RT, RTDS, dSPACE) for grid-tied, islanded, black-start, failover, and fault-injection scenarios Support certification and release evidence —

UL 1741 SB, IEEE 1547, IEC 61850

conformance, IEC 62443 / NERC CIP — with clear design and test documentation.

Minimum Qualifications:

B.S. or M.S. in Electrical Engineering, Power Electronics, Controls, or Computer Engineering (or equivalent experience) Strong grasp of power-electronics control — inverter current/voltage loops, PLL, droop, grid-forming/grid-following, and inverter-based-resource dynamics Hands-on real-time embedded software in C/C++ on RTOS (FreeRTOS/SafeRTOS/ThreadX) or PREEMPT_RT Linux, with bounded WCET, ISR, and deterministic scheduling discipline Practical experience with industry controllers / IEDs Working knowledge of power-system protocols:

IEC 61850

(GOOSE/MMS), Modbus, DNP3, and PTP time synchronization Experience with model-based design and HIL (MATLAB/Simulink, PLECS, Typhoon

HIL / OPAL-RT / RTDS

) and test automation in Python Ability to read SLDs, I/O lists, protection settings, control narratives, and register maps; clear technical writing for specs, test plans, and release evidence

Preferred Qualifications:

Microgrid / BESS plant controller, PPC, or grid-forming inverter control development Familiarity with Azure DevOps, Git mono-repo workflows, CI/CD, and formal change control / release gates Benefit at

Delta Electronics Americas:

Life at

Delta EEO Statement:

Delta Electronics Americas is an Equal Opportunity Employer and is committed to compliance with all applicable federal, state, and local laws. Delta Electronics America is committed to fostering a diverse, inclusive, and respectful workplace. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, age, marital status, national origin, disability, veteran status, or any other protected characteristic. #LI-DM