CN202811198U - Optimal-gain on-line self-correcting device of wind turbine generator set - Google Patents

Abstract

The utility model provides an optimal-gain on-line self-correcting device of a wind turbine generator set of a control strategy of rotating speed and torque of a wind turbine generator set. The optical-gain on-line self-correcting device of the wind turbine generator set is mainly composed of a temperature sensor, a temperature processing circuit, a master control programmable logic controller (PLC) and a self-correcting system, wherein the temperature sensor, the temperature processing circuit, the master control PLC and the self-correcting system are connected through circuits, and a temperature counting module, a data collecting module, an error analyzing module, a gain correcting module, a gain revising module and a gain value-limit module are arranged inside the self-correcting system. The optimal-gain on-line self-correcting device of the wind turbine generator set can acquire the running state of the wind turbine generator set, analyze the tracking error of the running state of the wind turbine generator set to a theory control strategy curve, and achieve the on-line correcting of optical grain so as to improve the running performance of the wind turbine generator set, and is low in cost and beneficial for promotion.

Description

A kind of optimum gain self-tuing on line device of wind-powered electricity generation unit

Technical field

The utility model relates to technical field of wind power generation, particularly relates to a kind of optimum gain self-tuing on line device of wind-powered electricity generation unit.

Background technique

Along with wind-power electricity generation constantly develops, the wind energy turbine set electric motor power is risen year by year in recent years, and the shared ratio of wind-power electricity generation is increasing, becomes gradually a kind of conventional energy resource.Along with improving constantly of wind turbine kludge capacity, industry is also more and more higher to the performance requirement of wind-powered electricity generation unit.In the wind-powered electricity generation power of the assembling unit is completely sent out rotational speed and torque control strategy below the rotating speed, relate to one and follow the tracks of the yield value that the maximal wind-energy utilization is caught, this yield value and actual wind energy resources situation are more identical, the control strategy of wind-powered electricity generation unit is capturing wind energy more accurately just, improves the generated energy of wind-powered electricity generation unit.If this yield value and reality have occured to depart from, then can affect the effect of control strategy, affect wind-powered electricity generation unit capturing wind energy, thereby affect wind-powered electricity generation unit generated energy.With the closely-related parameter of this yield value in, the characteristic with wind-powered electricity generation unit self that has is closely related, such as tip speed ratio and power coefficient etc., also has and the closely-related parameter of wind-resources, such as air density etc.The parameter such as tip speed ratio and power coefficient is fixed along with finishing of wind-powered electricity generation unit design, be difficult to the modification that designs and control, and air density is had any different respectively along with the difference in wind energy turbine set geographical position.

In the present control strategy, often adopt annual mean air density, perhaps take average temperature of the whole year through calculating annual mean air density, then utilize the yield value in this annual mean air density Calculation Speed Stator-Quantities Control.Because air density is subjected to season and temperature effect larger, the yield value that obviously calculates in this way always has larger deviation with actual value.Yet in present control strategy, yield value has been set a fixing value often when initialization, and can not carry out online correction according to actual environment.Therefore, in order to improve the wind-powered electricity generation unit to the capture ability of wind energy, improve the generated energy that the wind-powered electricity generation unit is found in equal wind-resources situation, promote simultaneously the performance of wind-powered electricity generation stable operation of unit, need to be according to the practical operation situation of actual environment and wind-powered electricity generation unit, the online optimal gain values to the rotational speed and torque control strategy is proofreaied and correct, and in real time the wind-powered electricity generation unit is carried out on-line optimization, to improve the ride quality of wind-powered electricity generation unit.

The model utility content

The technical problems to be solved in the utility model provides a kind of optimum gain self-tuing on line device of wind-powered electricity generation unit rotational speed and torque control strategy, make it can gather the running of wind generating set state, analyze operating states of the units to the tracking error of theoretical control strategy curve, realization is to the on-line correction of optimum gain, thus the ride quality of raising wind-powered electricity generation unit.

For addressing the above problem, the optimum gain self-tuing on line device of a kind of wind-powered electricity generation unit of the utility model rotational speed and torque control strategy mainly is comprised of the temperature transducer, Temperature Treatment circuit, the main control PLC that connect by circuit and the self correcting system that is built-in with temperature computation module, data acquisition module, error analysis module, gain calibration module, gain correcting module and gain limit value module.

As improving further, described Temperature Treatment circuit comprises Acquisition Circuit and eliminator.

After adopting above design, the utlity model has following beneficial effect:

1, solves the wind-powered electricity generation unit and completely sent out the problem that optimal gain values in the following rotational speed and torque control strategy of rotating speed can't self-tuing on line at power.

2, optimal gain values is carried out error analysis according to measured data, then optimum gain is proofreaied and correct, and has reduced the error of optimal gain values and actual value, has improved the ability of wind-powered electricity generation unit capturing wind energy.

3, the real-time optimal gain values that adopts real time temperature to calculate is revised it as a reference, is conducive to improve the stability of running of wind generating set.

4, adopt optimum gain maximum that local extreme temperature calculates and minimum as limit value, be conducive to further guarantee the operation stability of wind-powered electricity generation unit.

5, the utility model realization is comparatively easy, and cost is lower, is beneficial to popularization.

Description of drawings

Above-mentioned only is the general introduction of technical solutions of the utility model, and for can clearer understanding technological means of the present utility model, the utility model is described in further detail below in conjunction with accompanying drawing and embodiment.

Fig. 1 is rotary speed-torque master control strategy schematic representation.

Fig. 2 is the optimal gain values self-correcting apparatus structure schematic representation of the utility model wind-powered electricity generation unit rotational speed and torque control strategy.

Embodiment

See also Fig. 1, to be the wind-powered electricity generation unit completely send out control strategy between the rotating speed at be incorporated into the power networks rotating speed and power of power to the BC section among the figure, also is optimal gain values K _OptThe torque zone that acts on.

Please cooperate and consult shown in Figure 2ly, the optimum gain self-tuing on line device of wind-powered electricity generation unit control strategy comprises the optimum gain self-tuing on line system (gain calibration PLC) of the temperature transducer, Temperature Treatment circuit, main control PLC and the wind-powered electricity generation unit rotational speed and torque control strategy of the present utility model that connect by circuit.

Wherein, the Temperature Treatment circuit comprises Acquisition Circuit and eliminator, and the optimal gain values that correction PLC system obtains is passed main control PLC back by network communication, participates in wind-powered electricity generation unit master control strategy, forms closed loop control.Proofread and correct the PLC system and comprise data computation module, data acquisition module, error analysis module, gain calibration module, gain correcting module, gain limit value module.The function of above-mentioned each module is as follows:

The temperature computation module is used for gathering and calculating wind-powered electricity generation unit peripheral environment real time temperature;

Data acquisition module gathers the running of wind generating set data by network communication, mainly comprises generator speed and generator torque data, is used for follow-up link analysis;

The error analysis module is drawn actual measurement rotary speed-torque curve according to the running of wind generating set measured data, and itself and theoretical curve in the master control strategy are compared, and asks for root-mean-square error, for follow-up correction to optimal gain values;

The gain calibration module is calculated optimal gain values and is carried out the correction of optimal gain values according to root-mean-square error, root-mean-square error history value, optimum gain history value;

The gain correcting module calculates the real-time gain value according to wind-powered electricity generation unit peripheral environment real time temperature, and the optimal gain values that the gain calibration module calculates is further revised;

Gain limit value module calculates maximum and the minimum of optimal gain values according to the annual historical extreme temperature in locality, and gain-limitation is carried out in output to optimum gain.

The method of the optimum gain self-tuing on line of the utility model wind-powered electricity generation unit rotational speed and torque control strategy may further comprise the steps:

1, by the temperature computation module, gathers and calculates wind-powered electricity generation unit peripheral environment real time temperature t.

2, gather the running of wind generating set measured data: data acquisition module comprises generator speed Gen_Speed and generator torque Gen_Torque, and data is stored by the real time data of network communication collection main control PLC.

3, error analysis: the error analysis module is drawn out actual measurement rotary speed-torque curve with generator speed Gen_Speed and the generator torque Gen_Torque that gathers, and then the rotary speed-torque curve of actual measurement and the theoretical curve in the master control strategy is compared.If under the same rotating speed Gen_Speed, the actual measurement torque is Gen_Torque, and theoretical torque is Des_Torque, then asks for root-mean-square error e and is:

$e=\sqrt{\frac{\mathrm{\Σ}{(\mathrm{Gen}\_\mathrm{Toreque}-\mathrm{Des}\_\mathrm{Toreque})}^2}{n}}---\left(1\right)$

Wherein, n is the measuring point number.

4, gain calibration:

The gain calibration module is according to root-mean-square error e _p, root-mean-square error history value e _P-1, optimum gain history value k _P-1, calculate optimal gain values k _p, and to optimal gain values k _pProofread and correct.If the two error is e _r=e _p-e _P-1, optimal gain values k _pAt optimum gain history value k _P-1The basis on increase c*sign (e _r)/1000, c is gain correction coefficient, and the variation tendency of the last timing k of the symbology of c value, i.e. c=sign (k _P-1-k _P-2).

5, gain is revised: according to the real time temperature value t of wind-powered electricity generation unit peripheral environment and up and down temperature t-up, t-low in one day, calculate respectively real-time gain value k _t, k _Up, k _Low, then with k _tWith k _Up, k _LowCompare, establishing correction threshold is ρ=(k _Up-k _Low)/24, if | k _t-k _P|≤ρ, then k=k _PIf | k _t-k _P| ρ, then make the k value equal the last time and calculate k _P-1Value, i.e. k=k _P-1, to guarantee the stability of running of wind generating set.

6, gain limit value: output limits gain limit value module to optimum gain.Calculate the maximum k of optimal gain values according to the annual historical extreme temperature in locality _MaxWith minimum k _Min, as the limit value of optimal gain values k, that is, work as k _Min≤ k≤k _MaxThe time, keep k constant; As k＞k _MaxThe time, make k=k _MaxAs k＜k _MinThe time, make k=k _Min, further guarantee the stability of unit operation.

7, gain closed-loop feedback: the optimal gain values k that calculates by above-mentioned flow process, pass main control PLC participation master control policy control by proofreading and correct PLC back by network communication, form the self-tuning closed loop control of optimal gain values, improve the unit operation performance, promote simultaneously the stability of unit operation.

By said method and device, can realize the optimal gain values K of wind-powered electricity generation unit rotational speed and torque control strategy _OptCalculating, improve the ride quality of wind-powered electricity generation unit by real time correction, cost is lower, is easy to realize and promote.

The above; it only is preferred embodiment of the present utility model; be not that the utility model is done any pro forma restriction, those skilled in the art utilize the technology contents of above-mentioned announcement to make a little simple modification, equivalent variations or modification, all drop in the protection domain of the present utility model.

Claims (2)

1. the optimum gain self-tuing on line device of a wind-powered electricity generation unit rotational speed and torque control strategy is characterized in that: mainly be comprised of the temperature transducer, Temperature Treatment circuit, the main control PLC that connect by circuit and the self correcting system that is built-in with temperature computation module, data acquisition module, error analysis module, gain calibration module, gain correcting module and gain limit value module.

2. the optimum gain self-tuing on line device of wind-powered electricity generation unit rotational speed and torque control strategy according to claim 1, it is characterized in that: described Temperature Treatment circuit comprises Acquisition Circuit and eliminator.

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