🌞 Grid-Interactive Solar PV Water Pumping System using BLDC Motor Drive – MATLAB/Simulink Model
 
This advanced simulation model demonstrates a smart, grid-interactive solar water pumping system powered by a BLDC motor and supported by single-phase grid integration. The model showcases MPPT-based power extraction, DC-link voltage regulation, BLDC motor control, and bidirectional power flow between PV and grid under varying operating scenarios.
 
🔧 System Overview
 
The system consists of:
 
1️⃣ PV Array
Seven PV panels in series
Total output ≈ 1496.25 W at 199.5 V, 7.5 A
Irradiance-dependent power generation
Connected through a DC-DC Boost Converter
 
2️⃣ MPPT-Controlled Boost Converter
Implements Incremental Conductance (INC) MPPT
Inputs: PV voltage & PV current
Generates optimal duty cycle
Boosts PV voltage from 200 V → 270 V DC-link
 
3️⃣ Single-Phase Grid Integration
180 V RMS grid supply
LC filter + source inductance
Grid-tied inverter with voltage & current control loops
 
4️⃣ BLDC Motor Water Pump Drive
1 kW BLDC motor
Hall sensor signals → Back EMF → Switching logic
Six-step VSI switching logic
Drives a centrifugal water pump load
 
⚙️ Control Architecture
 
🔹 DC-Link Voltage Control
Measured DC link voltage compared with 270 V reference
PI controller generates reference current magnitude
 
🔹 Current Control Loop
Reference current × unit sine vector → Sinusoidal reference
PI controller → Modulation signal
SPWM generates inverter switching pulses
 
🔹 BLDC Motor Control
Hall sensors → Back EMF generation
Truth table logic → 6 PWM pulses
Smooth torque & speed control
 
🔄 Operating Modes Demonstrated
 
📌 Case 1 — Normal Operation (PV > Load)
Irradiance at 1000 W/m² → PV ≈ 1500 W
Load ≈ 1000 W
Excess 500 W exported to grid
DC link voltage maintained at 270 V
Source current lags by 180°, confirming power injection to grid
 
📌 Case 2 — BLDC Pump Disconnected
Irradiance = constant 1000 W/m²
Load torque changed from 3 Nm → 0 Nm
Motor current drops to zero
Entire PV power injected into grid
Grid current increases to ≈ 12 A
DC link stabilizes after transient
 
📌 Case 3 — PV Power Equals Load Power
Irradiance changed from 700 W/m² → 300 W/m²
At 700 W/m², PV ≈ 1000 W (powers only BLDC motor)
Grid neither imports nor exports power (zero grid current)
At 300 W/m², PV ≈ 100 W → Grid supplies remaining power
System stability regained after minor transient
 
📊 Scope Output
 
PV voltage, current & power
Grid voltage & current with phase relationship
BLDC motor:
Speed
Torque
Back EMF
Stator current
DC-link voltage
Dynamic transition behaviors during irradiance change, load change & pump disconnection
 
⭐ Key Features
 
Complete MATLAB/Simulink model with all blocks implemented
Realistic BLDC motor drive with hall-based commutation
Full MPPT algorithm (Incremental Conductance)
Grid-tied control including:
Voltage PI loop
Current PI loop
SPWM modulation
Multiple real-time operating case studies
 
🎯 Ideal For
Academic research
EV/grid control learners
Renewable energy & water pumping study
MATLAB/Simulink simulation practice