Control and protection system for direct series compensators.

Abstract

Invention details;

Claims

OCR1. Control and protection system for direct series compensator, where the direct series compensator consists of several compensating modules connected in series, and the control and protection system consists of: several control and protection units configured to generate voltage instructions for several series-connected compensating modules based on power instructions sent from the scheduler; several valve module interface units configured to forward voltage instructions; and several module control units configured to receive voltage instructions and generate open and close commands for electronic components in several series-connected compensating modules based on voltage instructions. Where several control and protection units, several valve module interface units, and several module control units are arranged independently, each control and protection unit corresponds to a certain valve module interface unit.

1. The interface unit of each valve module corresponds to a number of control module units, and each control module unit corresponds to one compensation module.

2. The control and protection system according to claim 1, which also includes the valve module interface, where a number of valve module interface units are also configured to share the valve module interface and transmit voltage commands to a number of control module units via the valve module interface.

3. The control and protection system according to claim 1, where each control and protection unit comprises a centralized control module, and the centralized control module is configured to generate voltage commands for a number of compensation modules connected in series according to the power commands sent from the scheduler.

4. The control and protection system according to claim 1,Each control and protection unit comprises: a centralized control module configured to generate voltage commands for the first injection for a number of series-connected compensation modules based on power commands sent from the scheduler, and to perform coordinated and centralized control with a number of series-connected compensation modules; and a valve control module configured to generate voltage commands for a number of series-connected compensation modules based on the pre-defined voltage command for the first injection or the second injection.

5. The control and protection system under claim 4, where the centralized control module comprises a voltage balancing control sub-module,Sub-protection modules and / or line overload control sub-modules for a number of compensation modules connected in series, and where the voltage balancing control sub-modules are configured to balance the three-phase line voltage; sub-protection modules are configured to protect the compensation modules and / or work in conjunction with the AC system protection function in the event of an AC system fault; and the line overload control sub-modules are configured to adjust the injection voltage command for the compensation modules when the line current connected to the direct series compensator or adjacent line exceeds a specified range, in order to maintain the current within the specified range.

6. Control and protection system according to claim 4, where the valve control module incorporates sub-coordinate control modules for a number of compensation modules connected in series, and where the sub-coordinate control modules are configured to control the insertion and uninsertion of the series-connected compensation modules.and / or allocate voltage commands for injection.

7. Control and protection system according to claim 4, where the control module unit comprises a DC voltage control module which is configured to stabilize the capacitor voltage of the corresponding compensation module; a line overload control module which is configured to control the line current connected to the corresponding compensation module within a specified range; an overcurrent protection module which is configured to prevent the corresponding compensation module from short-circuiting to protect the corresponding compensation module; and / or a voltage command limiting module which is configured to limit the voltage command for the corresponding compensation module within a specified range.

8. Control and protection system according to claim 7, where the DC voltage control module, line overload control module, voltage command limiting module and / or overcurrent protection module are integrated on the same control board.

9. Control and protection system according to claim 1, where the control and protection system is applied to a direct series compensator for multiple circuit lines,And the centralized control module also includes: a sub-coordinated control module for multi-circuit lines which is configured to allocate power commands for multi-circuit lines.

10. The control and protection system according to claim 1, where a number of control and protection units are combined with a primary control and protection unit and a backup control and protection unit, and the priority of commands generated by the primary control and protection unit is higher than that of commands generated by the backup control and protection unit.

11. The control and protection system according to claim 4, where the centralized control module and the valve control module communicate wirelessly or via fiber optic.

12. The control and protection system according to claim 1, where a number of compensation modules connected in series are combined with a first compensation module and a second compensation module, and where: the first compensation module is configured to receive voltage commands and send voltage commands to the second compensation module.

13. The control and protection system according to claim 1,Where a number of compensation modules connected in series are arranged in substations, switching station rooms, or containers, and the compensation modules use a cooling pathway that combines internal liquid cooling and external air cooling;

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