CONSULTING

MAIN TOPOLOGIES IN WHICH POEK LABS HAS EXTENSIVE EXPERTISE

Single-phase inverters (1φ VSI)

FULLBRIDGE MOSFET
FULLBRIDGE MOSFET

Split-phase inverters (Split-φ VSI)

FULLBRIDGE MOSFET
FULLBRIDGE MOSFET

Dual-active bridge converters

FULLBRIDGE MOSFET

Three-phase inverters (3φ VSI)

FULLBRIDGE MOSFET

DC-DC non-isolated converters

FULLBRIDGE MOSFET

Dual-active bridge converters

FULLBRIDGE MOSFET

Three-phase single current source inverters (CSI)

FULLBRIDGE MOSFET

Three-Phase Dual-Parallel (Dual-CSI)

FULLBRIDGE MOSFET

Three-Phase Dual-Series (Cascade-CSI)

FULLBRIDGE MOSFET

Single-Phase Modular Multilevel Converter (MMC)

FULLBRIDGE MOSFET
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DIFFERENT MODELLING TECHNIQUES

01
Switched-model development for control design
Switched-model development for control design
02
Circuit-averaged nonlinear models
Circuit-averaged nonlinear models
03
Small-signal (linearized) models
Small-signal linearized models
04
State-space representation
State-space representation
05
Transfer functions — typically from an output variable to an input duty cycle
Transfer functions
06
Steady-state models for system-level decisions — script-based and computationally fast
Steady-state models
07
Time-varying phasor models for complex systems such as parallel inverters
Time-varying phasor models

DIFFERENT TYPES OF CONTROLLERS DEVELOPED

CONTROL FRAMEWORK DESIGN

Design of complete, application-specific control architectures by selecting and integrating appropriate control strategies, including PI, PR, LQR, RST, MPC, and other advanced controllers. Each framework is tailored to the converter topology, operating modes, performance requirements, and customer specifications, ensuring a cohesive control structure with appropriately coordinated control loops and reference frames.

PI
Proportional-Integral Controllers (PI)
  • Anti-windup for the integral terms
    • Clamping (conditional integration)
    • Back-calculation
  • Saturation protection
SOGI
Second-Order Generalized Integrators (SOGI)
PR
Proportional-Resonant Controllers (PR)
TOGI
Third-Order Generalized Integrators (TOGI)
LQR
Linear Quadratic Regulator Control (LQR)
PLL
Phase-Locked Loops
  • Classical and SOGI-based synchronous reference frame (SRF-PLL)
RST
RST Control
  • The most generalized pole-placement controller structure
AI
Anti-islanding Techniques
  • Based on signal injection
MPC
Model Predictive Control (MPC)
AD
Active Damping (AD)
  • Full-state feedback active damping
  • Capacitor current feedback
  • Capacitor voltage feedback (with an HPF) — most common
αβ
Clarke and Park Transformations
DR
Droop Controllers
  • Inductive droop
  • Resistive droop
SOC
SOC Battery Control Balancing
  • Over the droop control

DIFFERENT TYPES OF MODULATION STRATEGIES

Pulse-Width Modulation diagram
Pulse-Width Modulation (PWM)
  • Classical for single-phase and three-phase inverters
  • Single-phase inverters
    • Bipolar
    • Unipolar continuous modulation
    • Unipolar discontinuous symmetric modulation
    • Unipolar discontinuous asymmetric modulation
Space Vector Modulation diagram
Space Vector Modulation (SVM)
  • For three-phase inverters (VSI and CSI)
Phase-Shift Modulation diagram
Phase-Shift Modulation (PSM)
  • For dual-active bridge (DAB) converters
  • Single-phase shift (SPS) modulation
  • Dual-phase shift (DPS) modulation
  • Triple-phase shift (TPS) modulation
Interleaving Modulation diagram
Interleaving Modulation
  • Interleaving modulation for MMC
  • Interleaving modulation for DC-DC Converters
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