Power flow control system for use in a direct current electrical network
The DC power flow control system addresses inefficiencies in DC networks by regulating voltage and current using power electronics, enabling efficient power management and connection of lines with varying voltages without transformers, thus preventing device damage and optimizing power flow.
Patent Information
- Application Number
- DE102024124701
- Authority / Receiving Office
- DE · DE
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-01-26
- Filing Date
- 2024-08-29
- Publication Date
- 2025-07-31
AI Technical Summary
DC networks react significantly differently than AC networks, leading to challenges such as unmanageable loops, high current peaks, and the need for distinct protection mechanisms, which result in inefficiencies and potential device damage due to current overload and voltage fluctuations.
A DC power flow control system comprising a voltage control module connected in series and a voltage supply unit in parallel with the DC line, capable of adjusting voltage and current, allowing for voltage regulation and current control without transformers, using power electronics to manage potential differences and current direction.
Enables efficient voltage and current management in DC networks, reducing losses and eliminating the need for transformers, while allowing connection of lines with different voltages and filtering distortions, thereby preventing device damage and optimizing power flow.
Smart Images
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Abstract
Claims
[1] DC power flow control system (20) arranged for use in an electrical DC network (10) and arranged to adjust the voltage and / or the current in a DC line (12) of the DC network (10), comprising a voltage control module (30) which can be connected serially to the DC line (12) of the DC network (10) for adjusting the voltage in the DC line (12); and a voltage supply unit (40) for supplying the voltage control module (30) with energy. [2] DC power flow control system (20) according to claim 1, characterized bythat the DC power flow control system (20) is designed to change voltages and potentials in the DC network (10) simultaneously and that the voltage supply unit (40) is controllable such that the potential of the voltage control module (30) follows the potential of the DC line (12) of the DC network (10) in a predefined manner and / or that the positive potential of the voltage control module (30) is greater than the potential of the DC line (12). [3] DC power flow control system (20) according to claim 1 or 2, characterized by that the voltage supply unit (40) is connected in parallel to a DC line (12) and that the voltage supply unit (40) is designed to effect an adjustment of the current flowing in the DC line (12). [4] DC power flow control system (20) according to the preceding claim, characterized bythat the voltage supply unit (40) is configured to inject a current into the DC line (12) and / or to absorb or compensate for distortions and / or current fluctuations. [5] DC power flow control system (20) according to one of the preceding claims, characterized by that the power flow control system (20) comprises a low-voltage high-current transistor or a mains voltage low-current transistor at a location provided for a transformer or transmitter. [6] DC power flow control system (20) according to one of the preceding claims, characterized by that the DC power flow control system (20) is free of transformers or transmitters. [7] DC power flow control system (20) according to one of the preceding claims, characterized bythat the voltage control module (30) and the voltage supply unit (40) are connected to the DC network (10) and are designed and connected in such a way that a power exchange between them takes place in a galvanically connected manner. [8] DC power flow control system (20) according to one of the preceding claims, characterized by in that the DC power flow control system (20) is configured to raise and / or lower the voltage across the DC line (12), wherein preferably both the DC voltage and dynamic components of the voltage of the DC line (12) are variable. [9] DC power flow control system (20) according to one of the preceding claims, characterized by that the voltage regulation module (30) and the voltage supply unit (40) comprise power electronic components, preferably transistors (54). [10] DC power flow control system (20) according to one of the preceding claims, characterized byin that the voltage supply unit (40) has a unidirectional transmission stage (64), wherein power is preferably transmitted from the voltage supply unit (40) to the voltage regulation module (30) and the voltage supply unit (40) has diodes (56). [11] DC power flow control system (20) according to one of claims 1 to 9, characterized by in that the voltage supply unit (40) has a bidirectional transmission stage (64) and comprises semiconductor components, wherein the semiconductor components are preferably designed such that they can be operated with the mains voltage of the DC network (10) and that they are preferably designed for a current of a maximum of 50% of the current of the DC line (12) and / or the voltage regulation module (30), particularly preferably for a maximum of 20%, very preferably for a maximum of 10% of the current of the DC line (12) and / or the voltage regulation module (30). [12] DC power flow control system (20) according to one of the preceding claims, characterized by that the power supply unit (40) has an earth connection for connection to earth (42). [13] DC power flow control system (20) according to one of the preceding claims, characterized by that the DC power flow control system (20) has a module DC voltage intermediate circuit (58) which has a voltage of less than 100 volts, preferably less than 60 volts, particularly preferably less than 30 volts, or a voltage of less than 10% of the mains voltage, preferably less than 5% of the mains voltage, particularly preferably less than 2% of the mains voltage. [14] DC power flow control system (20) according to one of the preceding claims, characterized by that the voltage supply unit (40) has a filter, preferably a filter capacitor (44), which is particularly preferably connected in parallel. [15] DC power flow control system according to one of claims 1 to 14, characterized by that the voltage supply unit (40) comprises a boost converter which generates an electrical potential which is higher than the potential of the DC line (12) and a buck converter which generates an electrical potential which is lower than the potential of the DC line (12). [16] DC network (10) with a DC power flow control system (20) according to one of the preceding claims. [17] DC network (10) according to claim 16, characterized by that the DC power flow control system (20) is designed to couple the DC network (10) to another DC network (10) with a different voltage and / or different potential and to adjust the voltage and / or potential. [18] DC network according to claim 16 or 17, characterized bythat the current flow and / or voltage differences can be controlled and regulated by means of a voltage control module (30) and / or a voltage supply unit (40), preferably by means of the DC power flow control system (20). [19] DC network according to claim 16 or 17, characterized by that the DC network (10) comprises at least one Kirchhoff loop in which a DC power flow control system (20) is arranged at least at one point, which is designed and configured to change the voltage between a first connection to the Kirchhoff loop and a second connection to the Kirchhoff loop or to generate a ring current component. [20] DC network according to claim 16 or 17, characterized byin that the DC network (10) comprises at least one strand in which a DC power flow control system (20) is arranged at at least one point, wherein the DC power flow control system (20) is designed and configured to change the voltage between a first connection of the DC power flow control system (20) to the DC network (10) and a second connection of the DC power flow control system (20) to the DC network (10).