Using Opal-RT Real-Time Simulation and HIL System in Power and Energy Systems Research
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1 Using Opal-RT Real-Time Simulation and HIL System in Power and Energy Systems Research Shuhui Li Department of Electrical & Computer Engineering The University of Alabama Presented on February 15, 2017 Atlanta, GA
2 Contents 1. Opal-RT system at UA 2. Solar energy conversion, generation and grid integration 3. Charging stations and transportation integration 4. Microgrid control and management 5. IPM motor control: EV and automation 6. NSF I/UCRC Center for efficient vehicles and sustainable transportation systems (EV-STS)
3 Renewable Energy Systems Laboratory (RESyL) RESyL Science & Engineering Quad Science and Engineering Quad
4 Opal-RT HIL and compatible hardware facilities Hardware interface #1 Target computer #2 Target computer #3 Target computer #1 Target computer #4 Hardware Facilities
5 PCs connected to Opal-RT system High-performance PC Local area network Opal-RT system
6 Contents 1. Opal-RT system at UA 2. Solar energy conversion, generation and grid integration 3. Charging stations and transportation integration 4. Microgrid control and management 5. IPM motor control: EV and automation 6. NSF I/UCR Center for efficient vehicles and sustainable transportation systems (EV-STS)
7 Solar Photovoltaic Power Generation Systems Grid connected PV system
8 Problems- Uneven Solar Irradiation Conditions Clouds will cause a shading problem
9 Central dc/ac and dc/dc converters Power (kw) None 50% 100% Vs (V) Overall Power (W) None % 100% Vs (V) Shaded cell
10 String converter based PV system Central dc/ac inverter and string dc/dc converters String inverter configuration
11 Micro converter based PV system dc/dc optimizers per module and a central inverter Microinverter PV system
12 PV Module with Bypass Diode Power (kw) n=18 n= Vs (V) I s full-sun n=1 Vs n=2 n=3 n=4 n=6 n=9 n=12
13 Computational and Hardware Experiments CPU 4 CPU 3 CPU 2 CPU 1 Output Power (kw) Temperature (F) Temp Max IC SF S-PI Irra Time (Hour) Time(s) 1000 Solar Irradiation(W/m2)
14 Grid-Connected PV and Energy Storage System Pref Qref
15 Artificial Neural Network for Control and Grid Integration of Residential PV Systems ANN Control for dc/ac inverter MPPT Control for dc/dc converter
16 320 (a) dc-link voltage (V) (b) grid current(a) 300 Vdc Time (s) I grid Vdc Time (s) I grid k Time (s) Time (s) (e) PV power(w) 2k 1k P pv P pv (f) Mag(% of Fundamental) Time (s) Harmonic order THD=4.67% Time (s) THD=12.98% Harmonic order
17 Contents 1. Opal-RT system at UA 2. Solar energy conversion, generation and grid integration 3. Charging stations and transportation integration 4. Microgrid control and management 5. IPM motor control: EV and automation 6. NSF I/UCR Center for efficient vehicles and sustainable transportation systems (EV-STS)
18 Energy Storage for Grid Power Leveling Help make energy sources, whose power output cannot be controlled, smooth and dispatchable.
19 Grid Integration: EV characteristics Three different kinds of vehicles make up the EV fleet: Plug-in Hybrid Electric Vehicles (PHEVs) Hybrid vehicles that run on an internal combustion engine with batteries that can be recharged by connecting a plug to an external power source. Larger batteries than traditional hybrid vehicles (e.g., 5-22 kwh). Unlimited driving range because of hybrid engines Extended Range Electric Vehicles (EREVs) Electric vehicles with relatively large batteries (e.g., kwh) capable of relatively long all electric ranges (e.g., miles). An on-board internal combustion engine provides an unlimited driving range by recharging the battery when needed. Battery Electric Vehicles (BEVs) Pure electric vehicles with no internal combustion engine Require recharging at the end of their designed driving range. Have the highest all-electric range (e.g., miles) and the largest battery capacity (e.g., kwh)
20 Grid Integration: Driving Characteristics Transportation data for U.S. driving patterns indicates 60% of domestic average daily driving is 30 miles or less Approximately 70% of driving is 40 miles or less. Upcoming EREVs: designed to drive 40 miles in all-electric mode. could accommodate 70% of driving in all-electric mode with a single over-night charge. daytime charging using public charging or at-work charging obviously extends vehicles effective all-electric driving ranges. BEVs have a limited driving range before extended charging is required (e.g., a mile battery, or even a 100-mile battery), urban and close-in suburban areas are the ideal target market.
21 Grid Integration: Charging Characteristics 3 levels charging schemes Charge level Utility Service Charge Power (kw) Time to charge AC Level 1 120V, 20A 1.44 > 8 hours AC Level 2 240V, 15-30A hours DC Level 3 480V, 167A min The total energy required to charge a battery, and the average energy required per day, depend on the miles driven and the vehicle energy consumption per mile. Additional power may be required for accessories and air conditioning during summer months. EVs will have onboard communications, computing capabilities, and the other functionality in the near term that will enable them to be "smarter" than most end-use loads.
22 Charging Stations with Other Renewables
23 Charging Stations with Built-in Energy Storage Lower power loss caused by converters Lower cost Efficient energy management
24 Real time simulation implementation Real-time model structure of the EDV charging station
25 Simulation results (1) Iref/Ibatt (A) Time (s) Iref Ibatt Vref/Vbatt (V) Vref Vbatt State of Charge (%) Time (s) Time (s)
26 Smart Transportation Grid Integration Battery remaining capacity Charging station locations Price information How much energy charging station can provide.
27 Contents 1. Opal-RT system at UA 2. Solar energy conversion, generation and grid integration 3. Charging stations and transportation integration 4. Microgrid control and management 5. IPM motor control: EV and automation 6. NSF I/UCR Center for efficient vehicles and sustainable transportation systems (EV-STS)
28 Microgrid in Power Distribution System A typical microgrid: a low-voltage distribution network distributed generation (DG) units distributed storage (DS) units controllable loads. Grid-tied mode, islanded mode Control and management of a renewable-based microgrid: a renewable source level a microgrid central control (MGCC) level a utility distribution management system (DMS) level.
29 ANN-ADP vector controller at DG Level ADP: approximate dynamic programming ANN: artificial neural network trained to implement ADP-based optimal control ANN-ADP: has potential to integrate optimal, predictive, PI, and PR control advantages together
30 Types of DER (distributed energy resources) inverters Grid-following inverter: PQ inverter DER: operates by injecting active and reactive power into the microgrid PV inverter DER: operates by injecting active power into the microgrid while simultaneously maintaining the PCC bus voltage at a desired value Grid-forming inverter: V-f inverter DER: Operates based on the conventional droop control concept, which is a necessary requirement in the microgrid islanding operating condition. Droop control:, f f r P P V V r Q Q s s0 f ac ac0 ac ac0 V ac ac0
31 A benchmark LV network with microgrid Grid connected Islanding
32 A benchmark LV network with microgrid Grid connected Islanding
33 Tracking variable reference commends (T s =1ms) 12 Wind Speed (m/s) Time (s) 200 Id Iq Id* Iq* Currents (A) Time (sec)
34 Connecting to the grid without synchronization control abc currents (A) abc currents (A) Time (sec) Time (sec)
35 Hardware Experiment System
36 Hardware Experiment Results d-axis current (A) Id Id-ref Time (sec) Grid d-axis current waveform Voltage (V) Time (sec) dc link voltage q-axis current (A) 1 Iq 0 Iq-ref Time (sec) Grid q-axis current waveform Voltage (V) Time (sec) Three-phase PCC voltage
37 Contents 1. Opal-RT system at UA 2. Solar energy conversion, generation and grid integration 3. Charging stations and transportation integration 4. Microgrid control and management 5. IPM motor control: EV and automation 6. NSF I/UCR Center for efficient vehicles and sustainable transportation systems (EV-STS)
38 PM motor control with standard three-leg inverter in EVs Speed or torque commend
39 Motor Controller Issues: Conventional Standard PMSM Control d Ld 0 vsd isd dt isd L i q sd 0 Rs e e PM v sq i sq d i sq L i d sq 1 0 L q dt * r * i d P I * i q P I P I * * v sq v a, b, c * v sd i q i a, b, c r e i d
40 How to address the issues: ANN-ADP Solution mech Outer rotor flux control * rd Outer speed-loop control mech * rd * mech rd mech PI PI i sd _ ref i sq _ ref P i sq i sd Conventional standard current-loop control PI PI v sd _ comp v sq _ comp + + * v sd * v sq d / dt j e e j e e e mech * v 1 * v 1 2/3 i, 2/3 2/3 * v a 1, b 1, c 1 Encoder PWM i sa i sb i sc Vdc + - v sc v sb v sa Motor o o Replace the conventional controller by a Neural Network Motor Controller (NNMC) Our NNMC uses Artificial Intelligence techniques that adapt quickly and efficiently in real-time i sq _ ref NN controller i sd _ ref i sq NN structure + + i sd s sd Input s sq e sd e sq NN structure Hidden layer Hidden Output * v sd * v sq tanh tanh Input Preprocess s sd 1/Gain2 tanh tanh tanh Output layer s sq tanh tanh tanh tanh V*sd e sd tanh tanh tanh tanh V*sq e sq 1/Gain tanh tanh tanh tanh tanh
41 Simulation for IPM Operating in Linear Over modulation Conditions (d- and q-axis currents)
42 HIL Dyno System for Motor Control Evaluation
43 Operation of IPM Motors in Linear and Over Modulation Regions Current (A) Ref ADP Conv -5 (a) Time (A) Current (A) Modulation Index (b) Ref ADP Conv Time (Sec) (c) 2 ADP Conv Time (Sec)
44 Investigate Applying Real-Time Simulation in Robotics and Automation From Solidworks to Simulink to Opal-RT
45 Contents 1. Opal-RT system at UA 2. Solar energy conversion, generation and grid integration 3. Charging stations and transportation integration 4. Microgrid control and management 5. IPM motor control: EV and automation 6. NSF I/UCRC Center for efficient vehicles and sustainable transportation systems (EV-STS)
46 Focusing Areas of NSF I/UCRC Center The Grid
47
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