Bipole Dynamic Braking Control for Neutral Current Balancing
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Solution Overview
Problem
Bipole power transmission networks with renewable power generation sources face instability due to unbalanced current flow through the neutral arrangement and DMR conductor, leading to environmental issues and system tripping when the DMR fails or is faulted.
Innovation Solution
A dynamic braking system with coordinated control of first and second dynamic braking units, regulated by a controller, to balance currents between transmission poles and neutral arrangement, ensuring no unbalanced current flows through the neutral arrangement, even in the absence of a DMR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If independent dynamic braking units are used for each transmission pole, then each pole can be controlled independently for fault ride-through, but unbalanced current flows through the neutral arrangement causing environmental issues and system tripping
Solution Approach 1:
The patent merges the control of first and second dynamic braking units under a single controller that coordinates both units. The controller receives operating state information and determines a common braking current that balances the currents from both poles, preventing unbalanced neutral current while maintaining fault ride-through capability.
Solution Approach 2:
The patent dynamically adjusts the braking current parameter based on the operating state of the transmission poles. The controller determines a common braking current that changes according to real-time conditions, ensuring balanced current flow while adapting to different fault scenarios and operational requirements.
2Object-generated harmful factors
If coordinated control is implemented to balance currents, then unbalanced neutral current is reduced to zero, but the system complexity increases
Solution Approach 1:
The patent implements a universal controller that handles multiple functions: monitoring operating states of both transmission poles, determining appropriate braking currents, coordinating both dynamic braking units, and ensuring balanced neutral current. This multi-functional approach consolidates control logic rather than increasing overall system complexity.
3Reliability
If dynamic braking system is activated during transient events, then stability is improved, but neutral arrangement current may cause environmental harm
Solution Approach 1:
The patent implements feedback control where the controller continuously monitors the operating state of the transmission poles and adjusts the braking current accordingly. By receiving information about pole conditions and determining a common braking current that balances both poles, the system maintains stability while preventing harmful neutral current flow through continuous feedback adjustment.
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
Prevents unbalanced current from flowing through the neutral arrangement, avoiding environmental harm and system tripping, ensuring stable operation of bipole power transmission networks.
Implementation Method 1
A DBS is a form of energy dissipation system that utilizes a resistive circuit to divert excess energy
Data Source
AI summary
A dynamic braking system for a bipole power transmission network including a first dynamic braking unit and a second dynamic braking unit connectable, respectively, between a first transmission pole and a neutral arrangement, and a second transmission pole and a neutral arrangement, of a bipole power transmission network. The dynamic braking system includes a controller configured to determine, based on an operating state of the bipole power transmission network, whether a third current equal to the difference between first and second currents flowing through the first and second dynamic braking units, can flow through the neutral arrangement. The controller is configured to operate the dynamic braking units independently if the third current is permitted to flow, and in coordination with each-other, to balance the first and second currents such that the third current is substantially zero, if the third current is not permitted to flow through the neutral arrangement.