An optimized calculation method and device for measured arc extinguishing angle of an inverter station
A technology for optimizing calculation and arc extinguishing angle, which is applied in the direction of power transmission AC network, etc., can solve the problems of frequent switching, commutation and failure of controllers, and achieve the effect of avoiding abnormal and stable operation
Active Publication Date: 2018-12-21
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0005] The purpose of this application is to provide an optimal calculation method and device for the actual measured arc extinguishing angle of the inverter station, so as to solve the problems of frequent switching of the controller and commutation failure caused by the abnormality of the current zero-crossing signal when the actual AC system is normal
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[0050] Refer to figure 1 The embodiment of the present application provides an optimized calculation method for the actual measured arc extinguishing angle of the inverter station, including:
[0051] Step S1: Obtain the arc extinguishing angle and AC voltage of the current cycle and the previous cycle;
[0052] Step S2: Calculate the arc-extinguishing angle deviation value and the AC voltage deviation value according to the arc-extinguishing angle and AC voltage of the current cycle and the previous cycle;
[0053] Step S3: Determine whether the arc-extinguishing angle of the current cycle is valid according to the deviation value of the arc-extinguishing angle and the AC voltage deviation value;
[0054] If the arc-extinguishing angle of the current cycle is valid, execute step S4 to determine whether the arc-extinguishing angle of the current cycle is greater than the minimum arc-extinguishing angle test value performed when the converter valve leaves the factory;
[0055] If the arc...
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The invention discloses an optimized calculation method and device for measured arc extinguishing angle of an inverter station. The method comprises the following steps of: acquiring arc extinguishingangle and AC voltage of a current period and a previous period; calculating the arc extinguishing angle deviation and the AC voltage deviation; Judging whether the arc extinguishing angle of the current cycle is valid; If so, whether the arc-extinguishing angle of the current cycle is greater than the minimum arc-extinguishing angle test value when the converter valve is out of the factory is judged; If yes, outputting the arc extinguishing angle of the current cycle to the polar control system; If not, determining whether the holding time is less than or equal to the commutation period; If yes, outputting the arc extinguishing angle of the previous cycle to the polar control system; If not, outputing the arc extinction angle of the current cycle to the pole control system. When the measured arc-extinguishing angle is abnormal, the invention prevents the system from adopting the wrong arc-extinguishing angle for control to cause abnormal and stable operation of the high-voltage DC system, and also avoids the DC system from being impacted when the measured arc-extinguishing angle of a commutating bridge is abnormal under the condition of oscillation of the AC system.
Description
Technical field [0001] This application relates to the technical field of high-voltage direct current transmission, and in particular to an optimized calculation method and device for the actual measured arc extinguishing angle of an inverter station. Background technique [0002] In the field of HVDC transmission technology, the pole control system controls the power transmission of DC. The pole control system can also be considered as the core control system of DC. The signals that the control system needs to collect usually include voltage, current, trigger angle, arc extinguishing angle γ, etc. Variable, the pole control system must calculate the value of the measured arc extinguishing angle γ every cycle to determine the current trigger pulse time. By changing the trigger pulse time, the power or DC voltage can be changed to complete the DC system control. [0003] In HVDC power transmission projects, arc extinguishing angle control is a commonly used control method for invert...
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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 邢超刘明群李胜男何鑫奚鑫泽何廷一杨蕾和鹏
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST