Voltage Source Converter Module Energy Dissipation Limb
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Solution Overview
Problem
Voltage source converters in power transmission networks face challenges in managing excess energy, which can lead to component damage or failure due to the lack of effective energy dissipation or absorption mechanisms, particularly during transient or fault conditions.
Innovation Solution
Incorporating an energy dissipation or absorption limb with energy dissipation or absorption elements, such as resistors and varistors, connected between junctions in the module, allowing module switching elements to divert current through these elements to safely manage excess energy, thereby protecting components and external circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If module switching elements are used to selectively provide voltage source, then power conversion function is achieved, but excess energy can cause component damage or failure
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by converting the harmful excess energy into a beneficial protective mechanism. The energy dissipation/absorption limb is specifically designed to capture and manage the excess energy that would otherwise damage components. The switching elements are configured to redirect this harmful energy through protective paths, transforming it from a threat into a controlled process that enhances system reliability.
Solution Approach 2:
The energy dissipation/absorption limb serves as an intermediary element between the switching elements and the potential damage to components. This intermediate structure provides a safe pathway for excess energy, mediating between the voltage source function and component protection, thereby preventing direct harm while maintaining operational functionality.
2Reliability
If energy dissipation or absorption limb is added to protect components, then component protection is improved, but device complexity increases
Solution Approach 1:
The patent applies the 'Merging' principle by integrating the energy dissipation/absorption limb into the existing module structure in a unified configuration. Rather than adding completely separate protective systems, the limb is merged with the switching elements and energy storage devices to form an integrated protective mechanism, reducing overall system complexity while maintaining protection functionality.
Solution Approach 2:
The energy dissipation/absorption limb is designed with multi-functionality, serving both as a protective element and as part of the overall power conversion system. The same structural elements contribute to both voltage source provision and excess energy management, thereby adding protection without proportionally increasing complexity.
3Reliability
If switching elements direct current through energy dissipation or absorption elements, then excess energy is safely managed, but energy loss increases
Solution Approach 1:
The patent applies the 'Partial or excessive action' principle by designing the energy dissipation/absorption limb to activate only when excess energy conditions occur, rather than continuously dissipating energy during normal operation. The switching elements selectively direct current through the protective limb only when protection is needed, minimizing energy loss while maintaining system protection capability.
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
This configuration provides an integrated protective mechanism that limits current and voltage, preventing damage and failure by safely dissipating or absorbing excess energy, even during abnormal operating states, thus enhancing operational reliability and efficiency.
Implementation Method 1
an energy dissipation or absorption limb operably connected between the first and second junctions, the energy dissipation or absorption limb including at least one energy dissipation or absorption element, wherein the module switching elements are configurable to selectively direct a module current to flow through the energy dissipation or absorption limb
Data Source
Figure 1
Figure 2(a)~2(b)
Figure 3
AI summary
There is provided a module (50,150) for a voltage source converter. The module (50,150) comprises: an energy storage limb (52) including a plurality of series-connected energy storage devices (58A,58B); a switching limb (54) connected in parallel with the energy storage limb (52), the switching limb (54) including first and second series-connected module switching element groups, the first module switching element group including a plurality of first module switching elements (60A,60B), the second module switching element group including a plurality of second module switching elements (64A,64B), a first intermediate point of the plurality of first module switching elements (60A,60B) defining a first connection terminal (62), a second intermediate point of the plurality of second module switching elements (64A,64B) defining a second connection terminal (66), the module switching elements (60A,60B,64A,64B) and the energy storage devices (58A,58B) arranged to be combinable to selectively provide a voltage source to the first and second connection terminals (62,66); a first junction (68A) separating the plurality of series-connected energy storage devices (58A,58B), a second junction (68B) separating the first and second series-connected module switching element groups; and an energy dissipation or absorption limb (56) operably connected between the first and second junctions (68A,68B), the energy dissipation or absorption limb (56) including at least one energy dissipation or absorption element, wherein the module switching elements (60A,60B,64A,64B) are configurable to selectively direct a module current (76) to flow through the energy dissipation or absorption limb (56).