Real-Time Dynamic Physics Simulation for Flexible DC Transmission
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Solution Overview
Problem
Current dynamic simulation devices for flexible HVDC transmission systems, particularly MMC-HVDC, are limited in simulating higher capacity and voltage levels, and lack real-time capabilities, making it difficult to accurately model and test the operation characteristics of these systems.
Innovation Solution
A real-time dynamic physics simulation device is developed, incorporating a simulated converter transformer, AC and DC fields, converter reactors, and a measurement and control cabinet with advanced components like DSP, FPGA processors, and optical fiber communication, enabling accurate simulation of 20-100MVA capacity and various voltage levels, with a modular design and low-voltage power supply to reduce impedance and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If physical simulation prototype with converter valve level number less than 15 is used, then device complexity is reduced, but manufacturing precision and simulation accuracy deteriorate
Solution Approach 1:
The converter is divided into multiple converter valves, each with multiple series-connected submodules. This segmentation allows the system to achieve high voltage and high capacity simulation (improving manufacturing precision) while maintaining manageable device complexity through modular architecture. Each converter valve can be independently configured with appropriate number of submodules to match the target voltage level.
Solution Approach 2:
The patent implements a nested structure where submodules are contained within converter valves, and multiple converter valves are assembled to form the complete converter. This nested doll approach allows systematic scaling - small-scale submodules nest within converter valves, which nest within the overall converter structure, enabling accurate simulation of large-scale systems while keeping individual component complexity low.
2Manufacturing precision
If high voltage and large volume physical simulation prototype is used, then simulation accuracy is improved, but device complexity and volume increase
Solution Approach 1:
The patent changes the voltage level parameter of the simulation device to match the actual engineering voltage level. By operating at the correct voltage parameter rather than scaled-down voltages, the device achieves accurate simulation results without requiring excessive volume. The modular design allows voltage scaling through series connection of submodules rather than increasing physical size proportionally.
Solution Approach 2:
The simulation device employs dynamic control capabilities with real-time simulation functionality, allowing the system to adapt its operating parameters dynamically. This dynamic operation enables accurate representation of high-voltage system behavior without requiring the physical device to be permanently scaled to high voltage dimensions, reducing overall device volume while maintaining simulation fidelity.
3Device complexity
If RTDS off-line test capability is used, then device complexity is reduced, but productivity and real-time simulation capability deteriorate
Solution Approach 1:
The patent replaces traditional mechanical/electrical RTDS off-line testing infrastructure with a digital real-time simulation system. By using digital signal processing and software-based simulation models running on modern computing platforms, the system achieves real-time simulation capability without the complexity and limitations of physical RTDS hardware. This substitution enables both real-time operation and simplified system architecture.
Data Source
AI summary
The present invention relates to a real time dynamic physics simulation device of flexible DC transmission system. The device includes simulated converter transformer, simulated AC field, simulated DC field, simulated converter reactor, simulated converter, and measurement and control cabinet chassis; the simulated AC field includes the vacuum switch I, the contactor I, resistors and the vacuum switch II connected orderly; the simulated DC field includes successively connected the vacuum switch contactor III and II; the simulated AC field is connected with said measurement and control cabinet chassis; Said converter transformer is set between said resistors and said vacuum switch II; Said simulated converter reactors and said simulated converter connected are set between the vacuum switch II and the vacuum switch III. The present invention can accurately simulate different voltage level flexible DC transmission system based on modular multilevel converter (MMC-HVDC), able to accurately understand the operation characteristics of MMC-HVDC and the dynamic responds to the instruction of the control system.