Control method and control device for inhibiting influence of series compensator on line protection
A technology of series compensation and control method, which is applied in the direction of circuit device, reactive power compensation, reactive power adjustment/elimination/compensation, etc. It can solve the problems of insignificant reduction of line voltage and inability to suppress the protection effect of series compensator, etc. To achieve the effect of ensuring accuracy, suppressing influence, and good engineering applicability
Pending Publication Date: 2022-05-31
NR ELECTRIC CO LTD +1
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[0006] The application number is CN107026432BCN and the name of the invention is a method and device for suppressing the influence of compensators on line distance protection. A method for reducing the voltage output based on the bus voltage corresponding to the series compensator connected to the line is proposed. The influence of the compensator on the distance current protection of the line, but when the single-phase high-impedance grounding occurs on the line, the line voltage does not drop significantly, the output of the compensator does not change, and it cannot restrain the effect of the series compensator on the line protection
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[0031] It should be understood that the terms "first", "second" and the like in the claims, description and drawings of the present application are used for regional
[0032] FIG. 1 is an equivalent schematic diagram of the basic structure of a series compensator provided by an embodiment of the present application.
[0036] When the system is in normal operation, the series side of the series compensator is put into operation to control and optimize the power flow of the system. and current mutual inductance
[0037] After detecting that the converter current Iv is greater than the action constant value Iv_Lim of the fast overcurrent protection, and the duration exceeds the fast
[0038] According to some embodiments, the process of exiting the series compensator is closing the bypass switch 2 and blocking the converter 3.
[0040] After detecting that the inverter zero-sequence current Iv0 is greater than the zero-sequence current limit value Iv0_Lim, and the zero-sequence curre...
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The invention provides a control method and a control device for inhibiting the influence of a series compensator on line protection. The series compensator is connected in series in a line of an alternating-current power grid and used for controlling the current of the line, the series compensator comprises a current converter, and the control method comprises the following steps: after the current Iv of the current converter is detected to be greater than an action constant value IvLim of rapid overcurrent protection and the duration time exceeds rapid overcurrent protection time TIv, the current converter is connected with the current converter; controlling the series compensator to perform rapid overcurrent protection action, and quitting the series compensator; after the zero-sequence current Iv0 of the current converter is detected to be larger than a zero-sequence current limit value Iv0Lim and lasts for zero-sequence current delay time TIv0, the output voltage of the current converter is controlled to be zero; and after the zero-sequence current Iv0 of the converter is detected to be smaller than the zero-sequence current recovery value Iv0Lim2 and the zero-sequence current recovery time TIv02 lasts, recovering the output normal voltage of the converter, and recovering the normal operation of the series compensator.
Description
Control method and control device for suppressing the influence of series compensator on line protection technical field The application relates to the technical field of flexible power transmission in the power system, and is specifically related to suppressing series compensator to line protection Influence control method and control device. Background technique With the rapid development of the interconnection technology of the power system, the power system of long-distance transmission has been widely used. use. During the long-distance power system operation, it is easily affected by factors such as the environment and load demand, and system shocks occur. It will lead to problems such as system stability control performance, AC-DC hybrid grid coordination, power flow control ability and other performance degradation. existing The technology adopts Static Synchronous Series Compensator (SSSC), unified Power flow controller (Unified Power Flow Controller, UP...
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IPC IPC(8): H02J3/18
CPCH02J3/1807Y02E40/30
Inventor 马秀达董云龙潘磊林艺哲
Owner NR ELECTRIC CO LTD