Closed-Loop Simulation Testing for Hybrid Power Conversion Control
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Solution Overview
Problem
The integration of new energy sources like wind and solar into power grids poses challenges for peak load and frequency regulation, and conventional two-level converter solutions struggle to adapt to high-proportion new energy power systems with large-scale energy storage, necessitating improved power conversion systems and verification methods for hybrid energy storage technologies.
Innovation Solution
A simulation test system and performance detection method for hybrid power conversion systems, incorporating a semi-physical closed-loop simulation system with a real-time digital simulator, I/O interface device, and hybrid energy storage controller, simulating grid-connected performance and control strategies for megawatt-scale systems using hybrid three-level ANPC topology with SiC MOSFET and Si IGBT hybrid multi-level converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional two-level converter is used, then the device complexity is low, but the adaptability to high-proportion new energy power systems is insufficient
Solution Approach 1:
The patent divides the power conversion system into multiple independent modular units, each capable of operating autonomously. This segmentation allows the system to scale flexibly and adapt to different new energy configurations without requiring complete system redesign, thus improving adaptability while managing complexity through standardized modules.
Solution Approach 2:
The patent implements dynamic control strategies that allow the converter topology to adapt in real-time to varying grid conditions and new energy source characteristics. The system can dynamically adjust operating modes, switching frequencies, and control parameters to optimize performance across different scenarios, enhancing adaptability without permanently increasing structural complexity.
2Power
If hybrid multi-level converter with SiC MOSFET and Si IGBT is used, then the power density and efficiency are improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies different semiconductor materials (SiC MOSFET and Si IGBT) to different parts of the converter system based on specific functional requirements. SiC MOSFETs are used in sections requiring high-frequency switching and high efficiency, while Si IGBTs are used in sections prioritizing cost-effectiveness and low-frequency operation. This localized optimization achieves high power density without uniformly increasing system complexity.
Solution Approach 2:
The patent employs a hybrid architecture combining SiC and Si-based power devices within the same converter system. This composite approach leverages the superior high-frequency performance of SiC while utilizing the cost advantages and robustness of Si IGBTs, achieving high power density and efficiency without proportionally increasing manufacturing complexity through standardized hybrid module designs.
3Measurement precision
If simulation modeling software is used for model verification, then the measurement precision of electrical characteristics is improved, but the reliability of control strategy verification for large-scale systems is insufficient
Solution Approach 1:
The patent creates a semi-physical test platform that replicates the essential characteristics of large-scale hybrid energy storage systems in a simplified, controllable environment. This virtual-physical hybrid model allows precise measurement of electrical characteristics while maintaining system reliability through controlled simulation conditions that can be repeatedly tested without the risks and costs of full-scale field testing.
Solution Approach 2:
The patent implements comprehensive control strategy verification through the semi-physical test platform before actual large-scale deployment. By conducting preliminary tests on modular components and control algorithms in the simulated environment, the system identifies and resolves potential issues early, ensuring reliability when the strategies are deployed to full-scale systems without compromising measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables strong adaptability and compatibility for grid-connected performance verification, ensuring safe and stable operation of large-scale energy storage power stations by simulating various conditions and testing the control strategies of hybrid power conversion systems, meeting the detection requirements for hybrid multi-level power conversion systems and controllers.
Implementation Method 1
the real-time digital simulator is connected to the I/O interface device through an optical fiber
Data Source
AI summary
A simulation test system and a performance detection method for a hybrid power conversion system are provided. The system includes a simulation workstation, a real-time digital simulator, an I/O interface device, and a to-be-tested hybrid energy storage controller. The simulation workstation sends an operation control instruction to the real-time digital simulator which simulates an operation working condition or an abnormal working condition of various faults of the simulation workstation in real time; the I/O interface device implements data interaction between the real-time digital simulator and the to-be-tested hybrid energy storage controller; the to-be-tested hybrid energy storage controller generates a switch tripping and closing instruction and a trigger pulse signal; and the real-time digital simulator sends the switch tripping and closing instruction and the trigger pulse signal to the simulation workstation, so that the simulation workstation performs simulation based on the switch tripping and closing instruction and the trigger pulse signal.