PV Simulator Deadbeat Predictive Current Control for Fast Response
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Solution Overview
Problem
Existing PV simulators have response times several times slower than actual PV modules, causing interference and limitations in testing PV power systems.
Innovation Solution
A fast-response PV simulator based on an improved deadbeat predictive current control (DPCC) system, which includes a reference value calculation module, a DPCC controller, and a modulation control module, to reduce response time and restore transient characteristics of real PV modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional PV simulation is used, then cost-effectiveness and arbitrary adjustability are achieved, but response time is several times slower than actual PV modules
Solution Approach 1:
The patent implements dynamic deadbeat predictive current control that continuously updates control parameters based on real-time system state. The controller dynamically adjusts the duty cycle by predicting future current states and calculating optimal control actions, enabling the simulator to adapt rapidly to changing conditions and achieve response times comparable to actual PV modules.
Solution Approach 2:
The system employs closed-loop feedback control where the actual output current is continuously measured and compared with the reference current. The error signal is fed back to the DPCC controller which adjusts the control duty cycle to minimize the error, ensuring accurate tracking of reference current and restoring transient characteristics of real PV modules.
2Reliability
If existing PV simulation response time is used, then system complexity is reduced, but interference and limitations in testing PV power systems occur
Solution Approach 1:
The control system is segmented into distinct functional modules: reference current calculation module based on PV array model, deadbeat predictive current control module for duty cycle calculation, and modulation control module for IGBT switching. This modular segmentation organizes the complexity into manageable components while achieving high response speed and testing accuracy.
Solution Approach 2:
The deadbeat predictive control calculates the optimal duty cycle in advance for the next switching period based on the current system state and reference current. By performing preliminary calculation of control actions, the system eliminates delay and achieves instantaneous response to current errors, improving testing accuracy without proportionally increasing complexity.
Data Source
AI summary
A fast-response photovoltaic (PV) simulator based on an improved deadbeat predictive current control (DPCC). Compared to actual PV modules, there is a response time at the output of the PV simulation. Currently widely used PV simulation have a long response time, which cannot meet the performance testing requirements of high-performance grid-connected PV inverters. Based on the energy balance of the inductor during the absorption and dissipation phases, the current control law of the output inductor in the PV simulation was studied in a single switching period, thereby establishing the required DPCC model. An integral compensation eliminates the steady-state error in current tracking caused by nonlinear factors such as time delay and mismatched parameters, enabling its wide application in engineering. For the proposed PV simulator, the transient response time can be reduced to 1.1 ms and significantly shorter than widely used PV simulation.