Flexible direct current power transmission system, and braking module and braking circuit thereof
A flexible DC and power transmission system technology, which is applied in the direction of emergency protection circuit devices, circuit devices, emergency protection circuit devices, etc. for limiting overcurrent/overvoltage, and can solve damage, high cost of braking modules, damage to power devices, etc. problems, to achieve high reliability, low cost, and avoid damage
Pending Publication Date: 2021-10-01
BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD
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Problems solved by technology
However, when there is a DC short-circuit current flowing in the braking module, the power devices in the braking module are easily damaged due to excessive DC short-circuit current.
In order to avoid damage to the power device in the braking module due to overcurrent, it is necessary to increase the power level of the power device, resulting in a higher cost of the braking module
Method used
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Embodiment Construction
[0028] Features and exemplary embodiments of various aspects of the invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention.
[0029] The brake module and the brake circuit in the embodiment of the present invention are used in a flexible direct current transmission system.
[0030] see figure 1 , the flexible DC transmission system is composed of DC fan array 1, DC busbar 2, brake circuit 3, MMC converter valve inverter 4, converter transformer 5 and AC circuit breaker 6. Among them, the DC fan array 1 is composed of N groups of DC fans (11-IN), and the braking circuit 3 is composed of half-bridge braking modules cascaded in sequence.
[0031] see figure 2 , The half-bridge braking module is composed of diode D1, diode D2, capacitor C1, IGBT device T3 and energy-discharging resistor R1. Wherein, the anode of the diode D1 is connected w...
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The invention discloses a flexible direct current power transmission system, and a braking module and a braking circuit thereof. The braking module of the flexible direct current power transmission system comprises an energy unloading sub-module, an energy storage sub-module and a current direction control sub-module. The current direction control sub-module comprises a first one-way conduction unit, a second one-way conduction unit, a third one-way conduction unit and a fourth one-way conduction unit, and the third one-way conduction unit, the energy storage sub-module and the second one-way conduction unit are used for controlling the current direction control sub-module if a direct-current short-circuit fault occurs on the direct-current side where the braking module is located, so as to form a flowing path of the direct current short-circuit current. By adopting the embodiment of the invention, when the direct current side where the braking module is located has the direct current short circuit fault, the power device in the braking module is prevented from being damaged due to overcurrent by inhibiting the direct current short circuit current in the braking module.
Description
technical field [0001] The invention relates to the technical field of wind power generation, in particular to a flexible direct current transmission system, a braking module and a braking circuit thereof. Background technique [0002] In the flexible direct current transmission system, the braking circuit is connected between the positive bus and the negative bus of the high-voltage direct current bus, and the braking circuit may include multiple cascaded braking modules. If a DC short-circuit fault occurs in the flexible DC transmission system, the DC short-circuit current will pass through each cascaded braking module in turn. However, when a DC short-circuit current flows in the braking module, the power devices in the braking module are easily damaged due to excessive DC short-circuit current. In order to prevent the power device in the braking module from being damaged due to overcurrent, it is necessary to increase the power level of the power device, resulting in a ...
Claims
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Login to View More IPC IPC(8): H02H9/04H02H9/02H02J3/38
CPCH02H9/045H02H9/02
Inventor 杨有涛袁小峰
Owner BEIJING GOLDWIND SCI & CREATION WINDPOWER EQUIP CO LTD