(MPPT) + DC/DC Converter using PSpice
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This document describes a simplified SPICE behavioral model for a maximum peak power tracker (MPPT) and DC/DC converter combination. The model focuses on the input/output relationships rather than circuit details, allowing long-term system simulation over 100 times faster than a cycle-to-cycle model. It is characterized by parameters like efficiency, input/output voltages, and current sensing that represent the converter's behavior. Transient simulations demonstrate how the MPPT tracks the solar cells' maximum power point under changing light intensity conditions.
(MPPT) + DC/DC Converter using PSpice
- 1. Maximum Peak Power Tracker (MPPT) + DC/DC Converter Simplified SPICE Behavioral Model All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 1
- 2. Contents 1. Model Overview 2. Benefit of the Model 3. Concept of the Model 4. MPPT+DC/DC Specification (Example) 5. Solar Cells Maximum Peak Power 6. Solar Cells System Transient Simulation All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 2
- 3. 1.Model Overview All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 3 • This MPPT + DC/DC Converter Simplified SPICE Behavioral Model is for users who require the model of a converter that will be used with their Photovoltaic system. • The model focuses on the input/output relationships of the converter block; therefore, it is not using high frequency models (e.g. oscillator and noise models), and is not based on the electronic topologies of the converter. • The model enables long-term behavior simulation of the system (e.g. in a Photovoltaic system simulation), which is increased simulation speed more than 100 times compared to a cycle-to-cycle model.
- 4. 2.Benefit of the Model • Enable its input solar cells to work at their Maximum Power. • Can be adjusted to your own DC/DC specifications, step-up or step- down, by editing the model parameters. • The simplified model is an easy-to-use, which can be provided without the circuit detail. • Time and costs are saved because only the necessary parts are simulated. All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 4
- 5. 3.Concept of the Model The model is characterized by parameters n, Vo, Vin_min, Vin_max, and Isns that represent the input-output-relationships of the converter. Isns is a current sensing pin that probes the input current (that is the input Solarcells’ current), together with VMPP the maximum power can be tracked. All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 5 MPPT + DC/DC Converter Efficiency (n) = POUT / PIN = VOUT × IOUT / VIN ×IIN VMPP = Input PV’s Vmp IN+ Isns OUT+ OUT- between VIN,MIN~VIN,MAX ) VOUT (Vdc) IIN = Input Solarcells’ Imp IOUT VMPP ( value is IN-
- 6. 4.MPPT+DC/DC Specification (Example) MPPT + DC/DC Converter with VIN=20~30Vdc, VOUT=24Vdc, and Efficiency=89% All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 6 MPPT + DC/DC Converter Efficiency (n) = 89% IN+ Isns OUT+ OUT- between VIN,MIN=20V ~ VIN,MAX=30V ) VOUT =24VdcVMPP ( value is IN- Rsns=0.1Ω
- 7. V_ V1 0V 4V 8V 12V 16V 20V 24V 28V V( U1: PLUS) * I ( Vs ens e) 0W 50W 100W 150W 5.Solar Cells Maximum Peak Power (1/2) Solar Cells # VBHN120SJ21_130530: Power(W) vs. Voltage(V). The simulation result shows the maximum power voltage (Vmp) at the different SOL values. All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 7 Temp 25°C SOL = 1,000W/m2 , Vmp=22.03V Vmp decreases as SOL(W/m2 ) decreases SOL = 800W/m2 , Vmp=21.72V SOL = 600W/m2 , Vmp=21.48V SOL = 400W/m2 , Vmp=21.2V SOL = 200W/m2 , Vmp=20.3V
- 8. 5.Solar Cells Maximum Peak Power (2/2) *Analysis directives: .DC LIN V_V1 0 26.4 0.01 .STEP LIN V_V3 200 1000 200 All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 8 +S O L T E M P 1 U 1 V B H N 1 2 0 S J 2 1 _ 1 3 0 5 3 _ C S V 0 V 1 0 V d c V 2 2 5 V 3 1 0 0 0 0 0 V s e n s e 0
- 9. Ti me 0s 2s 4s 6s 8s 10s 12s 14s V( O) 0V 20V 40V W( U1) - 200W - 100W 0W V( MPPT) 20V 22V 24V V( V3: +) 0V 0. 5KV 1. 0KV SEL>> 6.Solar Cells System Transient Simulation (1/2) When SOL(W/m2 ) changes the MPPT will track for new maximum peak power voltage (Vmp) as shown in the simulation result, the Vmp is changed to keep track on the maximum power position for each SOL value. All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 9 Temp 25°C SOL = 200W/m2 400W/m2 600W/m2 800W/m2 1,000W/m2 Vmp = 20.35V 21.22V 21.86V 22.37V 22.8V Pmax = 19.6W 43.6W 67.4W 90.1W 111.4W VO = 24V
- 10. 6.Solar Cells System Transient Simulation (1/2) *Analysis directives: .TRAN 0 12.32s 0 1000u All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 10 +S O L T E M P 1 U 1 V B H N 1 2 0 S J 2 1 _ 1 3 0 5 3 _ C S V M P P T 0 O 0 R 1 1 0 0 R 2 1 0 0 R s n s 0 . 1 V s e n s e _ s o la r c e ll 0 V 2 E : B e e Y 1 4 M P P T c a s e 2 C S V T 2 . c s v V 3 E : B e e Y 1 4 M P P T c a s e 2 C S V G 2 . c s v 0 0 U 2 M P P T _ D C D C V I N _ M I N = 2 0 V I N _ M A X = 3 0 N = 0 . 8 9 V O = 2 4 R S N S = 0 . 1 I N + I N - O U T + O U T - I S N S
- 11. U 2 M P P T _ D C D C V I N _ M I N = 2 0 V I N _ M A X = 3 0 N = 0 . 8 9 V O = 2 4 R S N S = 0 . 1 I N + I N - O U T + O U T - I S N S 7.MPPT+DC/DC: Symbol & Parameters RSNS is the value of the sensing resistor that is placed between minus pin of solar cell and ground. All Rights Reserved Copyright (C) Bee Technologies Corporation 2014 11