CN104166052A - Method for detecting super capacitor capacitance value of wind turbine generator pitch system - Google Patents
Method for detecting super capacitor capacitance value of wind turbine generator pitch system Download PDFInfo
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- CN104166052A CN104166052A CN201410380150.XA CN201410380150A CN104166052A CN 104166052 A CN104166052 A CN 104166052A CN 201410380150 A CN201410380150 A CN 201410380150A CN 104166052 A CN104166052 A CN 104166052A
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Abstract
The invention relates to a method for detecting a super capacitor capacitance value of a wind turbine generator pitch system. The pitch system is controlled through a controller, and comprises a pitch control driver and a super capacitor. The pitch system is communicated with the controller through a field bus. The method for detecting the super capacitor capacitance value comprises the following steps that power supplying to the pitch system is stopped; a super capacitor supplies power to the pitch system till the voltage of the super capacitor is lowered to a first set value and paddles are folded to the shutdown position; power is supplied to the pitch system, and the super capacitor is charged till a second set value is reached; the super capacitor capacitance value is calculated; logical judgment is carried out according to the worked out super capacitor capacitance value, and whether the worked out capacitor capacitance value meets set conditions or not is judged. By means of the method, the super capacitor capacitance value is automatically detected, and the reliability of running of a wind turbine generator is improved.
Description
Technical field
The detection method that the present invention relates to a kind of paddle change system of wind turbines super capacitor capacitance, belongs to wind turbine pitch system technical field.
Background technology
In recent years, along with the lasting of total installation of generating capacity of wind-powered electricity generation unit risen, industry also progressively improves the requirement of wind-powered electricity generation unit performance and operational reliability.Pitch-controlled system is as one of kernel subsystems of control system of wind turbines, and its major function has 2 points: the one,, while normally moving, according to the variation of wind speed, regulate propeller pitch angle, realize the regulation and control of power; The 2nd,, when blower fan breaks down, put away the oars fast to stop position, realize aerodynamic brake, guarantee the safety of wind-powered electricity generation unit.This second point function is wherein particularly important, because it is safety and the reliability that concerns running of wind generating set, is other all basis.
For pitch-controlled system, when line voltage is normal, the power that drives pitch motor to put away the oars provided afterwards by electrical network rectification; When line voltage falls or during power-off, needs back-up source to provide DC voltage to variable pitch driver, realize blade safe feathering, reach the object of safe operation.
The back-up source of pitch-controlled system, mainly contains two kinds, super capacitor and accumulator at present.With respect to accumulator scheme, super capacitor has long service life, power density is high, the response time is fast, efficiency for charge-discharge is high and the advantage of good temp characteristic.In the back-up source of the especially large megawatt wind set pitch control system of wind-powered electricity generation unit, apply very extensive.
Adopt at present the super capacitor pitch-controlled system of power supply in support, its charging modes mainly contains two kinds: the one, adopt RC charging circuit, as shown in Figure 1.Variable pitch driver, by a DO point control charging contactor K1, directly directly charges through charging resistor driver busbar voltage to super capacitor.After capacitance voltage value reaches certain value, disconnect charging contactor, super capacitor discharges naturally, and after its magnitude of voltage is reduced to particular value, meeting is closed charging contactor again, to its charging.The voltage that guarantees super capacitor remains at fluctuation in a rational scope.
Another charging modes is charger charging, as shown in Figure 2.In order to make full use of the energy storage characteristic of ultracapacitor, charger generally can adopt combined charging mode flexibly: when low pressure, adopt large electric current constant-current charge, along with successively decrease constant-current charge or modified constant-voltage charge mode are changed in the rising of ultracapacitor terminal voltage, until setting voltage, after this, adopt the mode of floating charge to guarantee that super capacitor voltage maintains on the magnitude of voltage of setting all the time.
But along with the increase of the life cycle of super capacitor, its capacitance can progressively reduce.Now, although voltage remains unchanged, the energy of its physical holding of the stock has reduced along with the reduction of capacitance.When the stored energy shortage of super capacitor completes while once putting away the oars to guarantee blade, wind-powered electricity generation unit in electric network power-fail or dependent failure situation, just cannot normally be put away the oars occurring, has the risk of driving.
And current, most control system are only monitored the magnitude of voltage of super capacitor, and its capacitance is not made a decision or only manually detected when the routine maintenance, and this has just reduced the reliability of running of wind generating set.
Summary of the invention
The detection method that the object of this invention is to provide a kind of paddle change system of wind turbines super capacitor capacitance, does not make a decision or manually detects in order to solve capacitor's capacity the low problem of running of wind generating set reliability that super capacitor causes.
For achieving the above object, the solution of the present invention comprises: a kind of detection method of paddle change system of wind turbines super capacitor capacitance, and pitch-controlled system is controlled by controller, and controller connects pitch-controlled system by Fieldbus Control.
The detection method of super capacitor capacitance comprises the following steps:
1). super capacitor is powered to pitch-controlled system, until super capacitor lower voltage to the first setting value, blade is put away the oars to stop position;
2). change electrical network and power to pitch-controlled system, and super capacitor is charged to the second setting value;
3). calculate super capacitor capacitance;
4). according to super capacitor, calculate capacitance and carry out logic judgement, whether judgement calculating capacitance meets imposes a condition.
Further, before giving change slurry system power supply, super capacitor disconnects electrical network to the power supply that becomes slurry system.
Further, when super capacitor meets self check condition, controller is controlled super capacitor and is automatically started to detect.
Further, pitch-controlled system comprises variable pitch driver, super capacitor, and controller is controlled the detection of super capacitor capacitance by variable pitch driver, and the core component of controller is microprocessor or PLC.
Further, variable pitch driver comprises rectification circuit, filter capacitor, inverter; Rectification circuit connects three-phase alternating current, and inverter circuit connects blade drive motor; Super capacitor is connected to the two ends of inverter circuit.
Further, the method of calculating super capacitor capacitance has two kinds of applicable cases: the first applicable cases is to adopt RC charging, and computing method are to calculate according to the duration of charging of variable pitch driver DC bus-bar voltage, the first setting value, the second setting value, charging resistor, record; The second applicable cases is to adopt charger charging, and computing method are to calculate according to the duration of charging of the charging current of variable pitch driver DC bus-bar voltage, record, record.
Further, imposing a condition is whether the actual capacitance of calculating and the deviation between nominal capacitance are greater than certain value; Or whether its actual stored energy meets a required ceiling capacity requirement of feathering.
The present invention is maintaining on the basis that original hardware system is constant, the control by controller and calculate and realize capacitor's capacity and automatically measure, and carry out logic judgement according to the capacitor's capacity detecting; The present invention does not additionally increase cost, and has improved the reliability of running of wind generating set.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that super capacitor adopts RC charging modes;
Fig. 2 is the schematic diagram that super capacitor adopts charger charging;
Fig. 3 is super capacitor capacitance detection method process flow diagram;
Fig. 4 is RC charging curve schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
The detection method that the invention provides a kind of paddle change system of wind turbines super capacitor capacitance, pitch-controlled system is controlled by controller, and controller connects pitch-controlled system by Fieldbus Control.
The detection method of super capacitor capacitance comprises the following steps:
1). super capacitor is powered to pitch-controlled system, until super capacitor lower voltage to the first setting value, blade is put away the oars to stop position;
2). change electrical network and power to pitch-controlled system, and super capacitor is charged to the second setting value;
3). calculate super capacitor capacitance;
4). according to super capacitor, calculate capacitance and carry out logic judgement, whether judgement calculating capacitance meets imposes a condition.
Based on above technical scheme, for the ease of statement, take controller as main control PLC, main control PLC is by CANopen control linkage pitch-controlled system, and single paddle is embodiment.But the present invention is not limited to following embodiment.
As shown in Figure 3, the present invention is when super capacitor meets self check condition, and controller is controlled super capacitor and automatically started to detect.Main control PLC is arranged, after wind-powered electricity generation unit starting, if while meeting super capacitor capacitance testing conditions, as pitch-controlled system powers on for the first time, sense cycle to or wind-powered electricity generation unit is safeguarded after, main control PLC is controlled super capacitor and is entered automatic detected state, and main control PLC disconnects the 400V power supply of pitch-controlled system.Now, main control PLC is changed super capacitor by variable pitch driver and is powered.Variable pitch driver comprises rectification circuit, filter capacitor, inverter, and rectification circuit connects three-phase alternating current, and inverter circuit connects blade drive motor, and super capacitor is connected to the two ends of inverter circuit.
Main control PLC is controlled blade in certain angle alpha by variable pitch driver
1, α
2between carry out back rotation, certain angle alpha
1, α
2be chosen at the position near feathering, angle can not be selected too little, otherwise can cause wind speed round too fast, and the safety of wind-powered electricity generation unit is brought to hidden danger.Meanwhile, main control PLC is by the magnitude of voltage of variable pitch driver Real-Time Monitoring super capacitor, and when the super capacitor magnitude of voltage of blade is less than predefined a certain voltage parameter value V, main control PLC is controlled blade and put away the oars to shutdown and complete.
Above-mentioned object is exactly in order to consume the magnitude of voltage of super capacitor, and these steps are necessary for the capacitance detection of super capacitor.
Shown in Fig. 1 is the scheme that adopts RC charging, and now the calculation procedure of super capacitor capacitance is as follows:
Shutdown completes and after time delay a period of time, main control PLC issues charge initiation order to variable pitch driver, and driver, by DO point control charging contactor K1 adhesive, starts super capacitor to charge.Record the now magnitude of voltage V1 of super capacitor, the starting potential of charging, and open timer simultaneously the duration of charging is carried out to timing.When capacitance voltage is charged to setting voltage value V2, while charging end voltage, main control PLC issues and stops charge command to variable pitch driver, and driver disconnects contactor K1 by DO point, and timer stops timing, and the timing time of timer is Δ t, i.e. duration of charging.RC charging curve schematic diagram as shown in Figure 4.
By RC charging principle:
Can obtain:
Here, V
efor variable pitch driver DC bus-bar voltage, V
t=V
2for charging end voltage value, V
0=V
1for charging starting potential value, these values are uploaded to main control PLC by CANopen communication after by variable pitch driver collection.T=△ t is the duration of charging, R=R
1for charging resistor resistance.Main control PLC, according to formula (2) processing that carries out related calculation, can draw the actual capacitance C of super capacitor.
Shown in Fig. 2 is the scheme that adopts charger charging, and the calculation procedure of super capacitor capacitance is as follows:
Shutdown completes and after time delay a period of time, main control PLC issues charge initiation order to variable pitch driver, and driver is by the input that enables of DO point control charger, and charger starts super capacitor to charge, until charge to setting voltage value.
Meanwhile, by variable pitch driver, record charging current I, capacitance voltage U and duration of charging t, by CANopen communication, be uploaded to main control PLC.
By:
Q＝CU＝It (3)
Can obtain:
Main control PLC, according to formula (4) processing that carries out related calculation, can draw the actual capacitance C of super capacitor.
The actual capacitance calculating according to two kinds of above methods is compared with its nominal value, when its deviation excessive, such as deviate be greater than nominal value 10% time, or the physical holding of the stock energy being calculated by actual capacitance is when once putting away the oars ceiling capacity required, by main control PLC, make corresponding fault warning, represent super capacitor existing problems, need maintenance or change.If capacitance and stored energy all meet the demands, represent that back-up source is normal, open machine operation.
More than provided concrete embodiment, but the present invention is not limited to described embodiment.Basic ideas of the present invention are above-mentioned basic scheme, and for those of ordinary skills, according to instruction of the present invention, model, formula, the parameter of designing various distortion do not need to spend creative work.The variation of without departing from the principles and spirit of the present invention embodiment being carried out, modification, replacement and modification still fall within the scope of protection of the present invention.
Claims (7)
1. a detection method for paddle change system of wind turbines super capacitor capacitance, is characterized in that, described pitch-controlled system is controlled by controller, and described controller connects pitch-controlled system by Fieldbus Control;
The detection method of described super capacitor capacitance comprises the following steps:
1). super capacitor is powered to pitch-controlled system, until super capacitor lower voltage to the first setting value, blade is put away the oars to stop position;
2). change electrical network and power to pitch-controlled system, and super capacitor is charged to the second setting value;
3). calculate super capacitor capacitance;
4). according to super capacitor, calculate capacitance and carry out logic judgement, whether judgement calculating capacitance meets imposes a condition.
2. the detection method of paddle change system of wind turbines super capacitor capacitance according to claim 1, is characterized in that, before super capacitor is given change slurry system power supply, disconnects electrical network to the power supply that becomes slurry system.
3. the detection method of paddle change system of wind turbines super capacitor capacitance according to claim 2, is characterized in that, when super capacitor meets self check condition, controller is controlled super capacitor and automatically started to detect.
4. the detection method of paddle change system of wind turbines super capacitor capacitance according to claim 3, it is characterized in that, described pitch-controlled system comprises variable pitch driver, super capacitor, controller is controlled the detection of super capacitor capacitance by described variable pitch driver, the core component of controller is microprocessor or PLC.
5. the detection method of paddle change system of wind turbines super capacitor capacitance according to claim 4, is characterized in that, described variable pitch driver comprises rectification circuit, filter capacitor, inverter; Rectification circuit connects three-phase alternating current, and inverter circuit connects blade drive motor; Super capacitor is connected to the two ends of inverter circuit.
6. the detection method of paddle change system of wind turbines super capacitor capacitance according to claim 5, it is characterized in that, the method of described calculating super capacitor capacitance has two kinds of applicable cases: the first applicable cases is to adopt RC charging, and computing method are to calculate according to the duration of charging of described variable pitch driver DC bus-bar voltage, the first setting value, the second setting value, charging resistor, record; The second applicable cases is to adopt charger charging, and computing method are to calculate according to the duration of charging of the charging current of variable pitch driver DC bus-bar voltage, record, record.
7. the detection method of paddle change system of wind turbines super capacitor capacitance according to claim 6, is characterized in that, described in to impose a condition be whether the actual capacitance calculated and the deviation between nominal capacitance are greater than certain value; Or whether its actual stored energy meets a required ceiling capacity requirement of feathering.
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Cited By (18)
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| CN105932743A (en) * | 2016-06-14 | 2016-09-07 | 观致汽车有限公司 | Battery management system, inverter, electric vehicle, and power regulation power for inverter |
| CN106405292A (en) * | 2016-09-30 | 2017-02-15 | 许继集团有限公司 | Fan variable pitch driver automatic testing system |
| CN107329011A (en) * | 2016-04-30 | 2017-11-07 | 上海珠淼科技有限公司 | Wind power pitch-controlled system back-up source electric capacity monitoring method |
| CN109142883A (en) * | 2018-10-17 | 2019-01-04 | 深圳众城卓越科技有限公司 | A kind of super capacitor volume test device and method of wind power pitch-controlled system |
| CN109212321A (en) * | 2018-08-30 | 2019-01-15 | 北京金风科创风电设备有限公司 | Method and device for detecting capacitance value of super capacitor |
| CN109900967A (en) * | 2017-12-07 | 2019-06-18 | 北京金风科创风电设备有限公司 | Capacitance value detection method and device of super capacitor and wind generating set |
| CN110471004A (en) * | 2019-08-05 | 2019-11-19 | 深圳市禾望电气股份有限公司 | Current transformer and its operation and monitoring method |
| CN110531275A (en) * | 2019-08-11 | 2019-12-03 | 埃斯倍风电科技(青岛)有限公司 | A kind of backup battery test method of pitch-controlled system |
| CN110907715A (en) * | 2018-09-14 | 2020-03-24 | 通用电气公司 | System and method for monitoring a supercapacitor |
| CN111156131A (en) * | 2020-01-06 | 2020-05-15 | 上海电气风电集团股份有限公司 | Intelligent control system and method for backup power supply of fan pitch control system |
| CN111241708A (en) * | 2020-02-13 | 2020-06-05 | 许昌许继风电科技有限公司 | Calculation method and model selection method of super capacitor for large fan variable pitch system |
| CN111786864A (en) * | 2020-06-09 | 2020-10-16 | 许昌许继风电科技有限公司 | Dual-drive variable pitch system supporting master-slave mode automatic switching function and switching method |
| CN112710901A (en) * | 2020-12-25 | 2021-04-27 | 深圳市禾望科技有限公司 | Direct current bus capacitance detection circuit and method |
| CN113567754A (en) * | 2021-07-30 | 2021-10-29 | 宁波三星医疗电气股份有限公司 | Method for detecting capacity abnormity of super capacitor |
| CN113991771A (en) * | 2021-10-08 | 2022-01-28 | 许昌学院 | Variable pitch system super capacitor charger early warning method |
| CN113992000A (en) * | 2021-10-21 | 2022-01-28 | 江苏神州半导体科技有限公司 | Vacuum ceramic adjustable capacitance closed-loop control system |
| CN114062975A (en) * | 2020-07-30 | 2022-02-18 | 北京金风科创风电设备有限公司 | State detection method of super capacitor, variable pitch system and wind generating set |
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| CN107329011B (en) * | 2016-04-30 | 2020-05-19 | 上海珠淼科技有限公司 | Backup power supply capacitance monitoring method for wind power pitch system |
| CN107329011A (en) * | 2016-04-30 | 2017-11-07 | 上海珠淼科技有限公司 | Wind power pitch-controlled system back-up source electric capacity monitoring method |
| CN105932743A (en) * | 2016-06-14 | 2016-09-07 | 观致汽车有限公司 | Battery management system, inverter, electric vehicle, and power regulation power for inverter |
| CN106405292A (en) * | 2016-09-30 | 2017-02-15 | 许继集团有限公司 | Fan variable pitch driver automatic testing system |
| CN109900967A (en) * | 2017-12-07 | 2019-06-18 | 北京金风科创风电设备有限公司 | Capacitance value detection method and device of super capacitor and wind generating set |
| CN109900967B (en) * | 2017-12-07 | 2021-01-22 | 北京金风科创风电设备有限公司 | Capacitance value detection method and device of super capacitor and wind generating set |
| CN109212321A (en) * | 2018-08-30 | 2019-01-15 | 北京金风科创风电设备有限公司 | Method and device for detecting capacitance value of super capacitor |
| CN110907715A (en) * | 2018-09-14 | 2020-03-24 | 通用电气公司 | System and method for monitoring a supercapacitor |
| CN109142883A (en) * | 2018-10-17 | 2019-01-04 | 深圳众城卓越科技有限公司 | A kind of super capacitor volume test device and method of wind power pitch-controlled system |
| CN110471004A (en) * | 2019-08-05 | 2019-11-19 | 深圳市禾望电气股份有限公司 | Current transformer and its operation and monitoring method |
| CN110531275A (en) * | 2019-08-11 | 2019-12-03 | 埃斯倍风电科技(青岛)有限公司 | A kind of backup battery test method of pitch-controlled system |
| CN111156131A (en) * | 2020-01-06 | 2020-05-15 | 上海电气风电集团股份有限公司 | Intelligent control system and method for backup power supply of fan pitch control system |
| CN111241708A (en) * | 2020-02-13 | 2020-06-05 | 许昌许继风电科技有限公司 | Calculation method and model selection method of super capacitor for large fan variable pitch system |
| CN111241708B (en) * | 2020-02-13 | 2023-06-06 | 许昌许继风电科技有限公司 | Calculation method and model selection method of super capacitor for large fan variable pitch system |
| CN111786864A (en) * | 2020-06-09 | 2020-10-16 | 许昌许继风电科技有限公司 | Dual-drive variable pitch system supporting master-slave mode automatic switching function and switching method |
| CN114062975A (en) * | 2020-07-30 | 2022-02-18 | 北京金风科创风电设备有限公司 | State detection method of super capacitor, variable pitch system and wind generating set |
| CN112710901A (en) * | 2020-12-25 | 2021-04-27 | 深圳市禾望科技有限公司 | Direct current bus capacitance detection circuit and method |
| CN113567754A (en) * | 2021-07-30 | 2021-10-29 | 宁波三星医疗电气股份有限公司 | Method for detecting capacity abnormity of super capacitor |
| CN113567754B (en) * | 2021-07-30 | 2023-12-01 | 宁波三星医疗电气股份有限公司 | Super capacitor capacity anomaly detection method |
| CN113991771A (en) * | 2021-10-08 | 2022-01-28 | 许昌学院 | Variable pitch system super capacitor charger early warning method |
| CN113991771B (en) * | 2021-10-08 | 2024-03-08 | 许昌学院 | Pre-warning method for super-capacitor charger of pitch system |
| CN113992000A (en) * | 2021-10-21 | 2022-01-28 | 江苏神州半导体科技有限公司 | Vacuum ceramic adjustable capacitance closed-loop control system |
| CN114325124A (en) * | 2021-12-31 | 2022-04-12 | 深圳市汇川技术股份有限公司 | Capacitance detection method, device and system and computer readable storage medium |
| CN114325124B (en) * | 2021-12-31 | 2024-04-26 | 深圳市汇川技术股份有限公司 | Capacitance detection method, device, system and computer readable storage medium |
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