A Parameter Design Method of Symmetrical Controllable Phase Shifter
A technology of parameter design and phase shifter, which is applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problems of insufficient utilization efficiency of transmission lines, achieve low daily maintenance costs, optimize power flow distribution, and increase transmission capacity Effect
Active Publication Date: 2015-08-19
STATE GRID CORP OF CHINA +5
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Problems solved by technology
[0004] The load of my country's receiving-end central power grid continues to increase, and the resources of line corridors are increasingly scarce. However, some of the existing transmission lines are overloaded and some of them have insufficient utilization efficiency. Effective power flow optimization methods are urgently needed. Therefore, controllable phase shifters have good development prospects.
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[0085] Take a specific system as an example: the rated voltage of the proposed installation site is 525kV, the rated current is 2.5kA, and the maximum allowable current is 2.95kA. It is required that the full-load phase-shifting angle of the controllable phase shifter is 25° under the rated working condition, the leakage reactance of the series and excitation transformers is selected as 11% and 14% based on the manufacturer’s commonly used values, and ABB_5STP series thyristors are selected, and their on-state root-mean-square current I T(RMS) =6680A.
[0086] According to the maximum allowable current of the line 2.95kA and the on-state RMS current of the thyristor 6680A, the transformation ratio of the series transformer can be determined:
[0087] k se =0.65
[0088] According to the leakage reactance of the series transformer is 11%, the leakage reactance of the excitation transformer is 14%, and the phase shift angle index is 25°, in order to satisfy the triangular rela...
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The present invention relates to the power electronics and the power equipment design field, in particular to a parameter design method of a symetrical controllable phase shifter. The method is used to determine the rated parameters of series connected transformers and an exciting transformer, and comprises the following steps of (1) selecting a thyristor and determining the on state root-mean-square current of the thyristor; (2) determining the transformation ratios of the series connected transformers and the exciting transformer separately; (3) determining the rated voltages of the series connected transformers and the exciting transformer separately; (4) determining the capacities of the series connected transformers and the exciting transformer separately; (5) determining the rated currents of the series connected transformers and the exciting transformer separately; (6) verifying the parameters of the series connected transformers and the exciting transformer. According to the present invention, the detailed parameter design method in allusion to the symmetrical controllable phase shifter is provided, a set of main device parameters can be designed accurately and rapidly, and the provided main device parameters can satisfy the requirements of preset indexes, having a practical guiding effect on the production and manufacture of the symmetrical controllable phase shifter.
Description
technical field [0001] The invention relates to the field of power electronics and power equipment design, in particular to a parameter design method of a symmetrical controllable phase shifter. Background technique [0002] The phase shifter belongs to the category of power system and is a power device for controlling the power flow of the line. It has been used in North America, Europe and other places for many years and plays an important role, but it has not been used in our country yet. The phase shifter is mainly composed of the excitation part, the on-load voltage regulation part and the series part. The excitation part is responsible for extracting energy from the system, the series part is responsible for feeding back the extracted capacity to the system, and the on-load voltage regulation part can adjust the size of the feedback capacity . The specific working principle is to inject a voltage into the line to change the phase of the voltage after the device access...
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IPC IPC(8): H02J3/00
Inventor 周飞于弘洋荆平杨增辉胡娟苏雪源詹建荣陈颖
Owner STATE GRID CORP OF CHINA