STATCOM Wye Topology Eliminates Phase Reactors
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Solution Overview
Problem
Current STATCOM stations with delta topology require phase reactors, which increase the physical footprint and maintenance complexity, and are costly due to the need for additional components like busbars and supports.
Innovation Solution
Implementing a wye-connected STATCOM topology that utilizes transformer leakage reactance instead of phase reactors to provide impedance, reducing the number of components and footprint, and allowing for a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase reactors are used in delta topology STATCOM, then required impedance is provided for reactive power generation, but physical footprint and device complexity increase
Solution Approach 1:
The patent merges the function of the phase reactor with the transformer by utilizing the transformer's leakage reactance to provide the required impedance. This eliminates the need for separate phase reactors and reduces the number of components in the STATCOM system.
Solution Approach 2:
The transformer is given a dual function: it not only performs voltage transformation but also provides the impedance necessary for reactive power generation through its leakage reactance. This multi-functionality reduces the overall component count and simplifies the system.
2Reliability
If phase reactors are used in delta topology STATCOM, then impedance is provided, but physical footprint and area increase
Solution Approach 1:
The patent merges the function of the phase reactor with the transformer by utilizing the transformer's leakage reactance to provide the required impedance. This eliminates the need for separate phase reactors and reduces the number of components in the STATCOM system.
3Reliability
If delta topology with phase reactors is used, then reactive power control is achieved, but maintenance complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates the phase reactor component from the system by using the transformer's leakage reactance instead. This removal of the phase reactor directly reduces maintenance complexity and associated costs.
4Object-affected harmful factors
If phase reactors are placed outside the valve hall, then electromagnetic interference with steel beams is avoided, but device complexity and footprint increase
Solution Approach 1:
The patent extracts and eliminates the phase reactor component from the system by using the transformer's leakage reactance instead. This removal of the phase reactor directly reduces maintenance complexity and associated costs.
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 approach significantly reduces the size, complexity, and cost of the STATCOM station while simplifying the circuitry and eliminating the need for external phase reactors, thereby minimizing maintenance and electromagnetic interference.
Implementation Method 1
the transformer leakage reactance provides the impedance for the necessary voltage difference between the grid and the MMC
Data Source
Figure 1~2
Figure 3a~4
AI summary
The present disclosure relates to a STATCOM arrangement (1) comprising an MMC (2) and a transformer arrangement (3) arranged to be an interface between the MMC (2) and an AC grid. The MMC (2) is connected in a wye topology with a plurality of converter arms, one for each phase of the AC grid, each arm comprising a plurality of chain-linked converter cells. The transformer arrangement (3) is arranged to interface each of the arms of the MMC (2) with a respective phase of the grid, and arranged to for each of the converter arms produce leakage reactance resulting in reactance in series with the arm which obviates the need for a phase reactor connected in series with said arm.