AN 995: Three-phase Boost Bidirectional AC-DC and LLC DC-DC Converter for EV Charging Design Example

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ID 784593
Date 9/15/2023
Public
Document Table of Contents
Document Table of Contents x
1. About the Three-phase Boost Bidirectional AC-DC and LLC DC-DC Converter for Electric Vehicle (EV) Charging Design Example 2. Getting started with the Design Example 3. Functional Description 4. Top-level VHDL Wrapper 5. Simulink Simulation Results 6. Document Revision History for AN 995: Three-phase Boost Bidirectional AC-DC and LLC DC-DC Converter for EV Charging Design Example
1. About the Three-phase Boost Bidirectional AC-DC and LLC DC-DC Converter for Electric Vehicle (EV) Charging Design Example x
1.1. FPGA Resource Usage
2. Getting started with the Design Example x
2.1. Software Requirements 2.2. Hardware Requirements 2.3. Downloading the Design 2.4. Installing the Design Example Templates 2.5. Programming the Board with the Design 2.6. Generating HDL Code with MATLAB and HDL Coder
2.5. Programming the Board with the Design x
2.5.1. Running the Design
2.6. Generating HDL Code with MATLAB and HDL Coder x
2.6.1. Generating HDL and QPF Using MATLAB Scripts 2.6.2. Generating HDL and QPF Using MATLAB GUI Tools
3. Functional Description x
3.1. Simscape* Model 3.2. Simulink* Model 3.3. HDL Inputs, Outputs, and Parameters
3.2. Simulink* Model x
3.2.1. AC-DC Converter Controller 3.2.2. Power Electronics 3.2.3. Source Voltage Generator Block 3.2.4. LLC DC-DC Converter
3.2.1. AC-DC Converter Controller x
3.2.1.1. PWM Controller 3.2.1.2. PLL 3.2.1.3. Sample and Hold Block 3.2.1.4. Clarke and Park Transforms
3.2.2. Power Electronics x
3.2.2.1. Six-switch Power Converter 3.2.2.2. Inductors 3.2.2.3. Output Capacitor
1. About the Three-phase Boost Bidirectional AC-DC and LLC DC-DC Converter for Electric Vehicle (EV) Charging Design Example
2. Getting started with the Design Example
3. Functional Description
4. Top-level VHDL Wrapper
5. Simulink Simulation Results
6. Document Revision History for AN 995: Three-phase Boost Bidirectional AC-DC and LLC DC-DC Converter for EV Charging Design Example

3.2.1.2. PLL

The Three-phase Boost Bidirectional AC-DC and LLC DC-DC Converter for EV Charging design example PLL block asserts the phases of the generated current references synchronous with the power grid. The rotating angle wt, an output of the PLL, is the same DQ frame rotation angle. The design uses the resulting rotation angle as feedback to calculate the angle wt for another DQ transform.
Note: The design controls the quadrature component of the voltage Vq to a value of 0. When Vq = 0, the PLL locks, which means that the references are fully synchronized with the grid.

To achieve a faster lock, the PI controller within the PLL uses high values of Kp and Ki . For this implementation, Kp = 10 and Ki = 100000 Ts (Ts = 50 ns).

The following figure shows the final implementation of the PLL using Simulink blocks in the discrete-time domain for FPGA HDL coder generation:

Figure 17. Phase-locked Loop Block for Grid Synchronization
Level Two Title