VSC-HVDC power transmission line pilot protection method based on model parameter identification
A VSC-HVDC, model parameter identification technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of high sampling frequency requirements, insensitive protection, slow action speed, etc. The effect of short window and strong resistance to transition resistance
Inactive Publication Date: 2013-07-10
XI AN JIAOTONG UNIV
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[0005] Most of the main protection in the existing VSC-HVDC lines adopts traveling wave protection, which requires high sampling frequency and is insensitive to protection under high transition resistance. Due to the influence of distributed capacitance, there is a disadvantage of slow action speed
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[0035] The present invention will be further described below in conjunction with the accompanying drawings.
[0036] The VSC-HVDC power transmission system consists of three parts: VSC rectifier station, VSC inverter station and DC transmission line. The rectifier station converts the alternating current to direct current, the transmission line transmits the direct current to the opposite inverter station, and the inverter station converts the direct current to alternating current. The core content of the invention is to provide fast and reliable protection for VSC-HVDC transmission lines.
[0037]There are large capacitors connected in parallel at both ends of the voltage source converter type DC transmission line. At the moment of a fault, the current fault component is mainly the discharge current of the parallel large capacitors, and the system side shows a capacitive characteristic. According to this feature, the present invention proposes a new principle of longitudinal...
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The invention provides a VSC-HVDC power transmission line pilot protection method based on model parameter identification. According to the VSC-HVDC power transmission line pilot protection method based on the model parameter identification, the capacitance of a capacitor model with positive external fault equivalence is identified to be positive, and a current and voltage derivative correlation coefficient is one, the capacitance of a capacitor model with negative internal fault equivalence is identified to be negative, and a current and voltage derivative correlation coefficient is negative one. The fault in an internal area and the fault in an external area can be distinguished by judging whether the identified capacitance or the correlation coefficient is positive and negative of. Theoretical analysis and PSCAD simulation tests prove that the VSC-HVDC power transmission line pilot protection method based on the model parameter identification has the advantages that compensation of capacitance current is not needed, the principle is simple, realization is easy, influence of transition resistance, fault types, fault positions and control methods are avoided, and fault in the internal area and the fault in the external area can be distinguished fast and reliably under various working conditions. The VSC-HVDC power transmission line pilot protection method based on the model parameter identification is mainly used for pilot protection of a VSC-HVDC power transmission line.
Description
technical field [0001] The invention relates to a method for relay protection of a power system, in particular to a method for longitudinal protection of a VSC-HVDC transmission line based on model parameter identification. Background technique [0002] Voltage Source Converter HVDC (Voltage Source Converter HVDC, VSC-HVDC) transmission system adopts fully-controlled switching devices and high-frequency PWM modulation technology, which is a flexible and efficient DC transmission and distribution technology. It has the characteristics of passive inverter, independent control of active and reactive power, no need to change voltage polarity for power flow reversal, no need for a large number of filtering and reactive power compensation devices, etc. Grid interconnection, multi-terminal direct current transmission and other fields have broad application prospects. [0003] DC transmission lines are generally long and have a high failure rate. A sound and reliable relay protecti...
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Inventor 宋国兵靳幸福马志宾高淑萍李德坤索南加乐
Owner XI AN JIAOTONG UNIV