disclosure of Invention
The invention aims to provide a method for judging the effectiveness of vibration acceleration data of an offshore wind turbine generator room, aiming at the defects of the prior art, and the method can improve the utilization rate of a wind turbine generator so as to increase the power generation capacity of the wind turbine generator.
The technical scheme of the invention is as follows: a method for judging the effectiveness of vibration acceleration data of an offshore wind turbine generator system cabin comprises the following steps: the method comprises the following steps that a main control system of the wind turbine generator collects vibration acceleration measurement values of two vibration acceleration sensors in the X direction and the Y direction in the wind turbine generator in real time, sets a distortion judgment coefficient Kp of the vibration acceleration measurement values, sets the maximum deviation value of the measurement values of the two vibration acceleration sensors in the same direction, and processes and calculates the vibration acceleration measurement values of the X direction and the Y direction according to the following steps:
1) The main control system of the wind turbine generator system calculates the absolute difference value of the vibration acceleration measured values of the two vibration acceleration sensors in the same direction in real time according to the collected vibration acceleration measured values in the X direction and the Y direction, and the step 2 is carried out;
2) Calculating the 10s average value of the absolute difference values in all directions in real time by the main control system of the wind turbine generator according to the absolute difference values obtained in the step 1), and entering the step 3);
3) calculating the validity judgment standard value of the vibration acceleration data during the wind yaw by the main control system of the wind turbine generator:
3-1), when the wind yaw device enters a wind yaw state, recording the 10s average value of the absolute difference values in all directions calculated in real time according to the step 2) at the entering moment by a main control system of the wind turbine generator;
3-2) comparing the 10s average value recorded at the moment of the wind yaw state with the set maximum deviation value of the measurement values of the two vibration acceleration sensors in the same direction by using the step 3-1), and taking the minimum value as a judgment standard value;
4) the main control system of the wind turbine generator system judges the effectiveness of the vibration acceleration data during the wind yaw and selects a protection strategy:
4-1), if the wind yaw device finishes wind yaw and the time exceeds 8s, the two vibration acceleration sensors recover normal measurement, and a main control system of the wind turbine generator adopts a vibration acceleration normal protection strategy;
4-2), if the wind yaw device does not finish wind yaw or wind yaw is finished but the time does not reach 8s, judging whether the vibration acceleration measurement data are distorted by a main control system of the wind turbine generator;
4-2-1), comparing the product of the judgment standard value obtained in the step 3-2) and the distortion judgment coefficient Kp of the vibration acceleration measured value with the absolute difference value of the vibration acceleration measured values of the two vibration acceleration sensors in the same direction calculated in real time according to the step 1), judging that the current vibration acceleration measured value has interference and the vibration acceleration is distorted as long as the absolute difference value of the vibration acceleration measured value in the X direction or the Y direction is greater than the product of the judgment standard value and the distortion judgment coefficient Kp of the vibration acceleration measured value, and entering a vibration acceleration measurement distortion state, otherwise, judging that the current vibration acceleration measured value is effective, wherein a main control system of the wind turbine generator set adopts a vibration acceleration normal protection strategy;
4-2-2), after the wind turbine generator is in a vibration acceleration measurement distortion state, if absolute difference values of vibration acceleration measurement values in the X direction and the Y direction calculated in real time are smaller than the judgment standard value in the step 3-2), adopting a vibration acceleration normal protection strategy by a main control system of the wind turbine generator, otherwise adopting a vibration acceleration measurement data distortion protection strategy by the main control system of the wind turbine generator;
The maximum deviation value is an empirical value for long-term operating data, typically 0.15m/s 2.
And the vibration acceleration measurement value distortion judgment coefficient Kp is an optimal value aiming at the wind field obtained by field experiments.
the optimal value for the wind farm from the field experiments is typically set to 2.
The normal vibration acceleration protection strategy is that when the measured value of any one of the two vibration acceleration sensors exceeds the designed protection limit value of the wind turbine generator, the wind turbine generator reports a vibration overrun fault to shut down, otherwise, the wind turbine generator normally operates.
the vibration acceleration measurement data distortion protection strategy is that when the measurement values of the two vibration acceleration sensors exceed the protection limit value designed by the wind turbine generator, the wind turbine generator reports vibration overrun fault shutdown, otherwise, the wind turbine generator operates normally.
Adopt above-mentioned technical scheme: a judgment method of cabin vibration acceleration data is added to a control program of a main control system of an offshore wind turbine. After the main control system of the wind turbine generator collects the measured values of the two vibration acceleration sensors, the measured values are processed and calculated by the judging method, whether the measured values of the vibration acceleration sensors interfere with the wind yaw device during the wind yaw can be distinguished, and whether the measured values of the vibration acceleration are real measured cabin vibration can be judged. Therefore, the main control system of the wind turbine generator can adopt different vibration acceleration protection strategies according to whether a vibration acceleration measured value is distorted or effective, if the vibration acceleration measured value is effective, a vibration acceleration normal protection strategy is adopted, if the vibration acceleration measured value is distorted, a vibration acceleration measured data distortion protection strategy is adopted, the wind turbine generator can report a fault and stop the wind turbine generator only when real cabin vibration exceeds a protection limit value, the vibration acceleration measured value caused by interference factors such as a yaw brake pad or abnormal friction of a yaw brake disc protects an over-limit value, the wind turbine generator cannot report a vibration over-limit fault, the wind turbine generator can maintain normal operation of the wind turbine generator, and therefore the wind turbine generator can be prevented from stopping due to the fault reported by mistake, the utilization rate of the wind turbine generator is improved, and the generating capacity of the wind turbine generator is increased. Moreover, maintenance personnel can not go out of the sea for fault misreporting, and labor cost is greatly saved.
the invention is further described with reference to the drawings and the specific embodiments in the following description.
Detailed Description
Referring to fig. 1 to 4, a method for determining validity of vibration acceleration data of an offshore wind turbine generator nacelle is as follows:
the method comprises the following steps that a main control system of the wind turbine generator collects vibration acceleration measurement values of two vibration acceleration sensors in the X direction and the Y direction in the wind turbine generator in real time, sets a distortion judgment coefficient Kp of the vibration acceleration measurement values, sets the maximum deviation value of the measurement values of the two vibration acceleration sensors in the same direction, and processes and calculates the vibration acceleration measurement values of the X direction and the Y direction according to the following steps:
1) And the main control system of the wind turbine generator system calculates the absolute difference value of the vibration acceleration measured values of the two vibration acceleration sensors in the same direction in real time according to the collected vibration acceleration measured values in the X direction and the Y direction, and the step 2) is carried out. The absolute difference is calculated using the following formula:
ACC_ERR_X＝ABS(ACC1_X-ACC2_X)；
ACC_ERR_Y＝ABS(ACC1_Y-ACC2_Y)；
Wherein:
ACC1_ X: the vibration acceleration sensor 1 collects measured values of the vibration acceleration in the X direction in real time;
ACC2_ X: the vibration acceleration sensor 2 collects the measured value of the vibration acceleration in the X direction in real time;
ACC1_ Y: the vibration acceleration sensor 1 collects the measured value of the vibration acceleration in the Y direction in real time;
ACC2_ Y: the vibration acceleration sensor 1 collects the measured value of the vibration acceleration in the Y direction in real time;
ACC _ ERR _ X: calculating the absolute difference value of the measured values of the vibration acceleration sensors 1 and 2 in the X direction in real time;
ACC _ ERR _ Y: calculating the absolute difference value of the measured values of the vibration acceleration sensors 1 and 2 in the Y direction in real time;
2) and respectively calculating a 10s average value ACC _ ERR _ X _ Avg10s of the absolute difference value in the X direction and a 10s average value ACC _ ERR _ Y _ Avg10s of the absolute difference value in the Y direction in real time by the main control system of the wind turbine generator through the linear filter with the time constant of 10s according to the absolute difference value obtained in the step 1), and entering the step 3).
3) Calculating the validity judgment standard value of the vibration acceleration data during the wind yaw by the main control system of the wind turbine generator:
3-1), detecting whether the wind yaw device starts wind yaw by a main control system of the wind turbine;
3-1-1), if the windage yaw device is not started to yaw, adopting a vibration acceleration normal protection strategy by a main control system of the wind turbine, wherein when the measured value of any one of the two vibration acceleration sensors exceeds a protection limit value, the wind turbine will report an overrun fault and execute rapid shutdown, and when the measured values of the two vibration acceleration sensors do not exceed the protection limit value, the wind turbine keeps normal operation;
3-1-2), if the wind yaw device starts wind yaw, when the wind yaw device enters a wind yaw state, recording the entering time by a main control system of the wind turbine generator according to the 10s average value ACC _ ERR _ X _ Avg10s of the X-direction absolute difference value and the 10s average value ACC _ ERR _ Y _ Avg10s of the Y-direction absolute difference value which are calculated in real time in the step 2), and entering the step 3-2);
3-2) comparing the 10s average value of the X-direction absolute difference recorded at the time of the windage yaw state with the set maximum deviation value of the measurement values of the two vibration acceleration sensors in the same direction in the step 3-1-2), taking the minimum value as a judgment standard value ACC _ STAD _ X of the validity of the X-direction vibration acceleration measurement value, comparing the 10s average value of the Y-direction absolute difference recorded at the time of the windage yaw state with the set maximum deviation value of the measurement values of the two vibration acceleration sensors in the same direction in the step 3-1-2), and taking the minimum value as a judgment standard value ACC _ STAD _ Y of the validity of the Y-direction vibration acceleration measurement value.
the maximum deviation value is an empirical value for long-term operating data, typically 0.15m/s 2. The maximum deviation value is the maximum difference value which is obtained by collecting vibration data during wind yawing and is possible to appear between two vibration acceleration sensors in the same direction under normal conditions, and 0.15m/s2 is an empirical value which is obtained by considering the difference of wind fields and can be suitable for most wind fields. When the judgment standard value is calculated, the maximum deviation value is used as a comparison value, so that the phenomenon that the measurement distortion of the vibration acceleration sensor occurs when the wind yaw device of the wind turbine generator enters the wind yaw device can be prevented, the judgment standard value is too large, the effectiveness of the measured value cannot be accurately judged, and the significance of effectiveness judgment is lost.
4) the main control system of the wind turbine generator system judges the effectiveness of the vibration acceleration data during the wind yaw and selects a protection strategy:
4-1), if the windage yaw device finishes windage yaw, and the time exceeds 8s, the two vibration acceleration sensors recover normal measurement, the master control system of the wind turbine generator adopts a vibration acceleration normal protection strategy, at the moment, when the measured value of any one of the two vibration acceleration sensors exceeds the protection limit value designed by the wind turbine generator, the wind turbine generator can report an overrun fault, and the wind turbine generator is rapidly stopped, and when the measured values of the two vibration acceleration sensors do not exceed the protection limit value, the wind turbine generator maintains normal operation.
4-2) the stop time of a yaw motor driving frequency converter of the wind turbine generator is 8s, so that if the wind yaw device finishes the wind yaw and the time does not reach 8s, the wind yaw device is considered to be in the wind yaw state, and a master control system of the wind turbine generator judges whether the vibration acceleration measurement data are distorted according to the following steps;
4-2-1), respectively comparing the product of the judgment standard value obtained in the step 3-2) and the vibration acceleration measured value distortion judgment coefficient Kp with the absolute difference value of the vibration acceleration measured values of the two vibration acceleration sensors in the same direction calculated in real time according to the step 1), as long as the absolute difference value ACC _ ERR _ X of the vibration acceleration measured value in the X direction is greater than the product ACC _ STAD _ X Kp of the judgment standard value in the X direction and the vibration acceleration measured value distortion judgment coefficient Kp, or the absolute difference ACC _ ERR _ Y of the measured value of the vibration acceleration in the Y direction is larger than the product ACC _ ERR _ Y Kp of the judgment standard value of the Y direction and the distortion judgment coefficient Kp of the measured value of the vibration acceleration, judging that the current vibration acceleration measurement value has interference, measuring the vibration acceleration distortion, and entering a vibration acceleration measurement distortion state; otherwise, judging that the current vibration acceleration measurement value is effective, adopting a vibration acceleration normal protection strategy by a main control system of the wind turbine generator, reporting an overrun fault by the wind turbine generator when the measurement value of any one of the two vibration acceleration sensors exceeds a protection limit value designed by the wind turbine generator, executing rapid shutdown, and maintaining normal operation of the wind turbine generator when the measurement values of the two vibration acceleration sensors do not exceed the protection limit value.
and the vibration acceleration measurement value distortion judgment coefficient Kp is an optimal value aiming at the wind field obtained by field experiments. The judgment coefficient Kp is an adjustable parameter of the wind field, and can be adjusted according to actual conditions, in this embodiment, Kp is set to 2, and Kp is 2, which is also applicable to most wind fields; of course, the determination coefficient Kp may also be set according to the actual situation of the wind farm, and is not limited to only 2. If the situation that the interference cannot be identified is found on site, and false alarm vibration overrun is generated during yawing, Kp can be adjusted to a small value, so that the interference can be accurately identified.
4-2-2), after the wind turbine generator is in a vibration acceleration measurement distortion state, if the absolute difference ACC _ ERR _ X of the vibration acceleration measurement values in the X direction calculated in real time according to the step 2) is smaller than the X direction judgment standard value ACC _ STAD _ X, and the absolute difference ACC _ ERR _ Y of the vibration acceleration measurement values in the Y direction is smaller than the Y direction judgment standard value ACC _ STAD _ Y, the vibration acceleration sensor recovers normal measurement, a main control system of the wind turbine generator adopts a vibration acceleration normal protection strategy, at the moment, when the measurement value of any one of the two vibration acceleration sensors exceeds the protection limit value designed by the wind turbine generator, the wind turbine generator reports an overrun fault and executes rapid shutdown, and when the measurement values of the two vibration acceleration sensors do not exceed the protection limit value, the wind turbine generator maintains normal operation; otherwise, the master control system of the wind turbine generator adopts a vibration acceleration measurement data distortion protection strategy.
The high-frequency micro-amplitude vibration which causes interference to the vibration acceleration measurement has inconsistency in conduction in the rack, and a wind turbine generator is randomly interfered in the wind deflection process, so that the two vibration acceleration sensors cannot be simultaneously influenced by the high-frequency micro-amplitude vibration.
5) No matter the wind turbine generator maintains normal operation or reports an overrun fault to execute rapid shutdown, a main control system of the wind turbine generator circularly and repeatedly processes and calculates the measured values of the two vibration acceleration sensors according to the steps, and vibration of the engine room is monitored in real time.
the above-mentioned determination method is applied to the offshore wind farm of jianxian angle of east and west, and the actual operation state is as shown in fig. 5, in which,
Accelation: a vibration acceleration measurement;
YawMotor: when the yaw state of the wind turbine generator is 1, the yaw device performs yaw, and when the yaw state is 0, the yaw device does not generate yaw;
acceleration Limit Exceeded: the vibration acceleration instantaneous vibration overrun fault state indicates that the fault is triggered when the vibration acceleration instantaneous vibration overrun fault state is '1', and indicates that the fault is not triggered when the vibration acceleration instantaneous vibration overrun fault state is '0';
it can be seen from the figure that, when the yaw device is yawing every time, that is, when YawMotor is 1, the measurement value Acceleration of the vibration Acceleration sensor has increased fluctuation, but the instantaneous vibration overrun fault state of the vibration Acceleration is always 0, which indicates that the wind turbine generator has not reported the vibration overrun fault and executes the shutdown when yawing occurs, so that the method can successfully judge the validity of the measurement value of the vibration Acceleration sensor, and thus judge whether the measurement value of the vibration Acceleration sensor is real cabin vibration.
By processing and calculating the measured value of the vibration acceleration sensor through the judging method, whether the measured value of the vibration acceleration sensor during the yaw of the wind yaw device is interfered or not can be distinguished, and whether the measured value of the vibration acceleration is the measured real cabin vibration or not is judged. Therefore, the main control system of the wind turbine generator can adopt different vibration acceleration protection strategies according to whether the measured value of the vibration acceleration is distorted or effective, if the measured value of the vibration acceleration is effective, a normal protection strategy of the vibration acceleration is adopted, if the measured value of the vibration acceleration is distorted, a protection strategy of the distortion of the measured data of the vibration acceleration is adopted, so that the wind turbine generator can report the fault and stop the machine only when the real vibration of the engine room exceeds the protection limit value, and the vibration acceleration measured value caused by the interference factors such as the abnormal friction of a yaw brake pad or a yaw brake disc protects the over-limit value, the wind turbine generator can not report the vibration over-limit fault, the wind turbine generator can maintain the normal operation of the wind turbine generator, thereby preventing the wind turbine generator from stopping due to the fault report by mistake, reducing or even eliminating the fault false alarm rate of the wind turbine generator, and the generated energy of the wind turbine generator is increased. Moreover, maintenance personnel can not go out of the sea for maintenance due to the fault of false alarm, the maintenance personnel are prevented from doing useless work when going out of the sea, and the labor cost is greatly saved.