Direct current transmission system and backup reactive control device thereof

Abstract

The invention provides a direct current transmission system and a backup reactive control device thereof. The backup reactive control device comprises reactive control units and measurement and control units, wherein the measurement and control units are connected with the reactive control units, are provided with interfaces used for detecting voltage of alternating current busbars, switching states of alternating current filters, and voltage and current of the direct current transmission system, and transmit detected information to the reactive control units; the reactive control units are connected with control interfaces of the alternating current filters and station control hosts, and connected with interfaces for acquiring working states of the station control hosts; and the reactivecontrol units are used for transmitting control commands to the control interfaces of the alternating current filters according to the working states of the station control hosts, busbar voltage information received from the measurement and control units and the current power level value. With the adoption of the technical scheme, the system can be controlled to exchange reactive power without pole control unit communication; the alternating current busbar voltage can keep stable; and stable control of the direct current transmission system after unavailability of two reactive control hosts can be achieved.

Description

technical field [0001] The invention belongs to the technical field of reactive power compensation control of a direct current transmission system, and in particular relates to a direct current transmission system and a backup reactive power control device thereof. Background technique [0002] With the continuous operation of DC UHV / EHV projects, the stable operation of the UHV DC transmission system is becoming more and more important to the stable operation of the entire power grid system, which requires the control system to have higher reliability. [0003] At present, there are two main methods of reactive power control in the UHV control system: [0004] The first is the independent configuration of the reactive power control device, that is, the reactive power compensation of the DC system is carried out by using an independently configured reactive power control device; the advantage of this method is that the structure is clear and the control is simple. Whether t...

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Problems solved by technology

[0004] The first is the independent configuration of the reactive power control device, that is, the reactive power compensation of the DC system is performed by using an independently configured reactive power control device; the advantage of this method is that the structure is clear and the control is simple. Whether the backup strategy is complete will directly affect the temperature operation of the system;

[0005] The second is to set the reactive power control device in the extreme control system, that is, to issue reactive power control commands through the extreme control system, such as figure 1 As shown; the advantage of this method is that it can avoid the situation that the whole station filter / capacitor cannot be controlled when the bipolar control layer exits, and reduces the risk of system outage when the bipolar layer control exits. The disadvantage is that the design of the system interface is complicated , the control logic is complicated, and the reliability is poor. Once the extreme control layer fails, reactive power compensation cannot be performed

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