Control method of integral saturation resistance in auxiliary machine failure load reduction process

Abstract

The invention discloses a control method of integral saturation resistance in the auxiliary machine failure load reduction process, which is characterized in that a RB (Radio Beacon) signal is not adopted to trigger; two amplitude limiters are additionally arranged in front of a hand-operated device; triggering is carried out through comparing a command with the output of an auxiliary machine; when an auxiliary machine at the other side trips or fails, and the auxiliary machine at the side is in an automatic state; the output at the side is suddenly increased; within the scope allowed by the output of the auxiliary machine at the side, the integral saturation resistance action is not generated; and if the output at the side is exceeded, an integral saturation resistance function is generated till the integral saturation is eliminated. The control method has the beneficial effects that when an auxiliary machine of a thermal power unit fails, the load can be quickly and effectively reduced; within a period of time before reset in the RB process, if the auxiliary machine fails or parameters are improperly set, the integral saturation resistance function can also be generated through the design; and when the output of the auxiliary machine is larger and is lower than the maximum output of the auxiliary machine at the single side, the RB signal cannot trigger a controller to track, so that the oscillation of a system is prevented; and the safe operation of the auxiliary machine is favorably maintained.

Description

technical field [0001] The invention relates to a control method for anti-integral saturation in the process of auxiliary machine failure and load reduction. Background technique [0002] With the increasing capacity of thermal power units, when the important auxiliary equipment of the unit fails, the impact and impact on the power grid will become greater and greater. The safe and stable operation of the unit is related to the safety of the power grid. In order to improve the stable operation of power plants and power grids , when the actual power of the unit is limited due to the fault trip of the main auxiliary equipment of the unit (the coordination control system is in the automatic state), in order to adapt to the output of the equipment, the coordination control system will forcefully reduce the load of the unit to the load that the auxiliary equipment that is still in operation can bear target value. This function of the coordinated control system is called auxiliar...

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Problems solved by technology

[0005] In thermal power generating units, the commonly used RB anti-integral windup logic design is to introduce the RB signal into the logic to realize the anti-integral windup function when RB occurs. figure 1 This design can only realize the instant anti-integral saturation when RB occurs, but during the RB process until a period of time before reset, if the output of the auxiliary machine is small or the parameters are not set properly, integral saturation will still occur, which may lead to The reverse adjustment time is slow. Secondly, if the output of the auxiliary machine is large and there is no saturation phenomenon, the RB signal will still act at this time, and a reverse tracking signal will be generated, which will cause the system to oscillate, which is not good for adjustment.

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