Adapter Reactor Series Impedance Reactive Power Compensation
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Solution Overview
Problem
Existing reactive power compensation systems in power transmission lines face issues with voltage variations, high costs due to complex structures and components, inability to limit short-circuit currents, and harmonic overvoltages passing through transformers, leading to increased harmonic filter requirements.
Innovation Solution
Incorporating an adapter reactor in series with the transformer to connect the reactive power compensator to the power transmission line, which reduces the number of components and simplifies the structure of the compensator, providing additional impedance to manage reactive power and harmonic components effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the reactive power compensator is connected directly to the voltage busbar, then the compensation response is fast, but the voltage variations at the busbar cause significant disturbance and device breakdown
Solution Approach 1:
The adapter reactor is introduced as an intermediary component between the transformer and the voltage busbar. This reactor provides additional impedance that limits the magnitude of voltage variations transmitted to the busbar, thereby protecting connected devices from disturbance and breakdown while still allowing the compensator to respond effectively to reactive power needs.
2Ease of manufacture
If the transformer reactance is reduced to limit voltage increase, then the transformer cost decreases, but the short-circuit current cannot be limited and harmonic overvoltages pass through easily
Solution Approach 1:
The adapter reactor serves as a mediator that provides the necessary impedance to limit short-circuit current and block harmonic overvoltages. This allows the transformer to be designed with lower reactance and reduced cost, while the reactor handles the harmful electrical phenomena.
Solution Approach 2:
The function of limiting short-circuit current and blocking harmonics is extracted from the transformer and assigned to the dedicated adapter reactor. This separation of functions allows the transformer to be optimized for its primary purpose of voltage transformation at lower cost.
3Adaptability or versatility
If a high power reactive power compensator is used to cover the full range from 150 MVAr capacitive to 150 MVAr inductive, then the compensation capability is complete, but the structure and components become complex and installation costs increase significantly
Solution Approach 1:
Instead of designing a compensator to handle the full extreme range of reactive power needs, the system uses the adapter reactor to manage the bulk of voltage control and reactive power management. The compensator itself can be smaller and less complex, intervening only when needed, thereby reducing structural complexity and installation 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 solution improves reactive power compensation efficiency, reduces component losses and installation work, decreases the number of harmonic filters needed, lowers costs, and enhances the reliability and stability of the electric network by controlling voltage variations and harmonic components.
Implementation Method 1
providing at a substation, where the arrangement of Figure 1 may possibly be located, a voltage source... the transformer 2 may be dimensioned, for instance, in such a manner that the power of the transformer 2 may be 150 MVA and reactance 12%... as low impedance of the transformer 2 as possible to limit the voltage increase induced by capacity current
Implementation Method 2
a transformer 2 or a main transformer 2, via which the voltage level of the power transmission line 1 can be reduced
Implementation Method 3
The thyristor-controlled reactor 5 comprises a coil and a thyristor switch controlling it, which thyristor switch may comprise up to tens of thyristor levels connected in series and consisting of antiparallel-connected thyristor pairs
Data Source
Figure 1~2
AI summary
An arrangement and a method for reactive power compensation in connection with a power transmission line (1). The arrangement comprises at least one transformer (2) and at least one reactive power compensator (4) connected to the low-voltage side of the transformer (2) and at least one adapter reactor (8), the adapter reactor (8) being connected in series with the transformer (2) so that the reactive power compensator (4) is connected to the power transmission line (1) via the transformer (2) and the adapter reactor (8).