A high-resistance compensation method for UHV transmission lines
A transmission line, high-resistance compensation technology, applied in circuit devices, AC network circuits, emergency protection circuit devices, etc., can solve problems such as power frequency overvoltage, charging reactive power exceeding the standard, etc.
Active Publication Date: 2018-10-02
STATE GRID CORP OF CHINA +1
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Problems solved by technology
[0008] Aiming at the problems existing in the above-mentioned prior art, the present invention provides a high-resistance compensation method for UHV transmission lines, specifically a high-resistance compensation method for AC UHV transmission lines, the purpose of which is to solve the charging problem of long-distance UHV AC power grids. Problems of excessive reactive power and power frequency overvoltage
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[0069] The invention is a high-resistance compensation method for UHV transmission lines. Figure 4 Implement the flowchart for concrete steps, including the following steps:
[0070] Step 1: Establish a PSCAD-based electromagnetic transient simulation model of the system: collect system parameters, including synchronous motors, transmission lines, main transformers, series compensation, low-voltage reactor compensation, low-voltage capacitor compensation, 500kV network engineering lines, 500kV transformers, and section loads Parameters; based on the electromagnetic transient modeling method, establish a distributed model of UHV transmission and transformation lines, a detailed model of the main transformer and UHV networking projects, and an equivalent model of regional grid power and load;
[0071] Step 2: Determine the total charging reactive power Q of the UHV transmission line with a length of l c and high resistance compensation Q g1 , by calculating the UHV typical li...
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The invention relates to the field of alternating-current ultrahigh voltage transmission and transformation engineering and design, in particular to a high-voltage shunt reactor compensation method for a typical ultrahigh voltage transmission line and discloses a high-voltage shunt reactor compensation method for an alternating-current ultrahigh voltage transmission line. The method includes the steps that a PSCAD-based electromagnetic transient simulation model of a system is established; the total charging reactive amount Qc and the high-voltage shunt reactor compensation amount Qg1 of the ultrahigh voltage transmission line with the length of 1 are determined; the requirements for inhibiting power frequency overvoltage generated by the no-load capacitance effect of the ultrahigh voltage line, power frequency overvoltage generated by load shedding of the line under the full-load condition and power frequency overvoltage generated by a single-phase earth fault of a low voltage side are comprehensively considered according to general rules of line high-voltage shunt reactor compensation, and finally the capacity Qg25 of a parallel high-voltage shunt reactor on the sending end grid side of the ultrahigh voltage transmission line and the capacity Qg15 of a parallel high-voltage shunt reactor on the receiving end grid side of the ultrahigh voltage transmission line are determined to arrange the parallel high-voltage shunt reactors of the ultrahigh voltage transmission line. The steady-state voltage adjusting characteristics of the system are considered, so that the load flow of a power grid and the voltage of the ultrahigh voltage transmission line are stably controlled to be within a more reasonable range.
Description
technical field [0001] The invention relates to the field of AC ultra-high voltage transmission and transformation engineering and design, in particular to a high-resistance compensation method for an ultra-high voltage transmission line, in particular to a high-resistance compensation method for an AC ultra-high voltage transmission line. Background technique [0002] The UHV power grid has a longer distance, larger capacity, and lower loss power transmission capability. However, the charging reactive power of UHV transmission lines per 100km line length can exceed 530MVA, which is about 4-6 times that of 500kV lines at the same line length. Excessive charging reactive power will cause high-amplitude power frequency overvoltage. [0003] In the UHV power system, the power frequency overvoltage has an important influence, because the magnitude of the power frequency overvoltage directly affects the magnitude of the operating overvoltage, and may endanger the safe operation ...
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IPC IPC(8): H02J3/00H02H9/04
Inventor 程孟增沈方孙刚张明理史喆商文颖宋颖巍李华李常信孙晓非张晓天朱赫炎梁毅胡大龙蒋理
Owner STATE GRID CORP OF CHINA