DC Energy Network Control System for Feedback Prevention
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Solution Overview
Problem
Energy networks, such as DC railway systems, face challenges in preventing energy feedback into external supply networks due to strict contractual bans, leading to disruptions when traditional feedback prevention methods disconnect all consumers from the power supply.
Innovation Solution
A control system that monitors energy flow and automatically initiates countermeasures, such as sending blocking or limiting signals to feedback units, to prevent energy feedback by adjusting energy consumption and generation ratios, ensuring continuous supply to consumers without violating supplier bans.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circuit breaker is parameterized to open when energy is fed back from the energy network into the supply network, then feedback into the supply network is prevented, but all consumers in the energy network are disconnected from the higher-level supply network and not supplied with energy
Solution Approach 1:
The control device monitors the power drawn from the supply network and detects when it falls below a threshold value, indicating imminent feedback. Blocking signals are sent to feedback units preemptively to prevent feedback before it occurs, avoiding the need to disconnect consumers. This preliminary detection and action resolves the contradiction by preventing feedback while maintaining continuous supply to consumers.
2Productivity
If feedback units such as photovoltaic systems and braking energy feedback are used in the energy network, then energy generation and efficiency are improved, but the risk of energy being fed back into the external supply network increases
Solution Approach 1:
The control device continuously monitors the power drawn from the supply network and the operation status of feedback units. When the drawn power falls below a threshold or when feedback is detected, the control device sends blocking signals to feedback units to prevent feedback. This feedback control mechanism allows feedback units to operate efficiently while preventing harmful energy feedback into the supply network, resolving the contradiction between productivity improvement and feedback risk.
3Object-affected harmful factors
If blocking signals are sent to feedback units to stop energy feedback, then feedback into the supply network is prevented, but the energy network cannot utilize the benefits of feedback units
Solution Approach 1:
The control device dynamically adjusts the operation of feedback units based on real-time monitoring of power drawn from the supply network. When power drawn is sufficient, feedback units operate normally to generate energy and improve efficiency. When power drawn falls below a threshold, blocking signals are sent to prevent feedback. This dynamic control resolves the contradiction by allowing feedback units to contribute to energy generation while preventing harmful feedback into the supply network under appropriate conditions.
Data Source
Figure 1
AI summary
The invention relates to a method and to an arrangement for controlling an energy network (1), in particular a direct current energy network. In order to avoid a feeding back of energy in the energy network (1) into an external supply network (3), according to the invention, an amount of energy, which is exchanged with a higher-order supply network (3), is detected, and at least one amount of energy which is fed into and/or consumed in the energy network is influenced such that a feeding back of energy into the external supply network (3) is avoided.