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PMU data-based identification method for single electric transmission line zero-sequence parameter robustness

A transmission line and identification method technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve problems such as bad data of PMU data, unreliable identification values, and difficulty in elimination.

Inactive Publication Date: 2014-06-18
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0005] However, PMU data also inevitably has random measurement errors. What is more serious is that due to the influence of various random factors in the process of data measurement, transmission and storage, various bad data will appear in PMU data.
If the PMU data is used without processing, the existence of bad data (gross error) will have an adverse effect on the identification of zero-sequence parameters, making the identification value unreliable; but it is very difficult to eliminate all kinds of bad data from the massive PMU data , the most effective method is to use the parameter identification method with robustness

Method used

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  • PMU data-based identification method for single electric transmission line zero-sequence parameter robustness
  • PMU data-based identification method for single electric transmission line zero-sequence parameter robustness
  • PMU data-based identification method for single electric transmission line zero-sequence parameter robustness

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Embodiment

[0103] This embodiment uses PSCAD to build a 500kV simulation system, such as Figure 4 As shown, the zero-sequence parameters of the single-circuit transmission line L1 are identified. The 500kV line L1 is a single-circuit line, and the zero-sequence parameter design values ​​are: resistance R0=16.28Ω, reactance X0=102.27Ω, excluding the zero-sequence capacitance to ground. Set a single-phase ground fault in the middle of phase A of line L2, and the fault duration is 1s; suppose that PMUs are installed at both ends of line L1, and the three-phase asymmetrical voltage and current phasors at both ends of line L1 are measured during the fault period, and the sampling interval is 1ms . Due to the occurrence of zero-sequence components during asymmetrical faults, the 1s data during the current fault period is used to identify the zero-sequence resistance and reactance of line L1 according to the embodiment, and the following experiments are set up to demonstrate the effectiveness...

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Abstract

A PMU data-based identification method for single electric transmission line zero-sequence parameter robustness comprises the following steps that firstly, according to the three-phase unsymmetrical operation state of a single electric transmission line, a zero-sequence equivalent model of the single electric transmission line is obtained through symmetrical component transformation, and further a mathematical equation for zero-sequence parameter identification is constructed by using the zero-sequence voltage and current components on the two ends of the single electric transmission line; secondly, under the unsymmetrical operation state of a power grid, the zero-sequence voltage and current components on the two ends of the single electric transmission line are obtained according to three-phase unsymmetrical voltage and current phasors measured by PMUs arranged on the two ends of the single electric transmission line through symmetrical component transmission; thirdly, a Huber estimation-based robustness target function is established according to the Huber robustness estimation theory and the constructed mathematical equation for zero-sequence parameter identification; lastly, parameter identification is performed by using the fmincon function of the matlab according to the obtained zero-sequence voltage and current components on the two ends of the single electric transmission line and the established robustness target function, and thus the zero-sequence parameter of the single electric transmission line is obtained.

Description

technical field [0001] The invention relates to a PMU data-based anti-difference identification method for zero-sequence parameters of a single-circuit transmission line. Background technique [0002] Transmission line parameters are the basic data for power system calculation and operation control, such as power flow calculation, state estimation, fault analysis, protection setting, etc. Inaccurate line parameters will affect the safety, stability and economic operation of the power system. [0003] The zero-sequence parameters of transmission lines are related to the setting calculation of power system relay protection, but compared with the positive-sequence parameters, the zero-sequence parameters are more affected by external factors, such as ground resistivity, equivalent depth, conductor layout, etc. Precise theoretical calculation of zero sequence parameters is almost impossible. Therefore, my country's relay protection regulations stipulate that zero-sequence param...

Claims

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Application Information

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IPC IPC(8): G01R31/00G01R19/00
Inventor 陈晓科赵艳军杨汾艳孙闻盛超毕天姝唐景星王玲付聪张跃曾杰王钤薛安成黄梓华张兆阳安然然罗航张健张远王奕胡玉岚张俊峰陈锐马明
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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