CN102223059B - Control method and control device for voltage source inverter brake circuit - Google Patents
Control method and control device for voltage source inverter brake circuit Download PDFInfo
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Abstract
The invention discloses a control method and a control device for a voltage source inverter brake circuit, wherein the method comprises the steps of sampling and measuring the instantaneous voltage of a direct-current bus; calculating and obtaining the instantaneous power of a brake resistor according to the instantaneous voltage, a brake PWM (pulse-width modulation) duty cycle and the resistance value of the brake resistor; carrying out low-pass filtering on the instantaneous power and obtaining the average power of the brake resistor; carrying out proportion and integration on the difference value of the allowable maximum power and the average power of the brake resistor and obtaining the power factor duty cycle; obtaining the voltage factor duty cycle according to the difference value of the instantaneous voltage and a prearranged voltage threshold; obtaining the product of the voltage factor duty cycle and the power factor duty cycle; using the product as the brake PWM duty cycle to generate a PWM waveform; and inputting the PWM waveform to a driving circuit used for driving the brake circuit. The control method and the control device have the advantages of optimizing the control on the direct-current bus pump voltage, and avoiding burning the brake resistor.
Description
Technical field
This area relates to Motor Control Field, relates in particular to a kind of control method and device of voltage source inverter brake circuit.
Background technology
AC Motor Driver Control System based on voltage source inverter (Voltage Source Inverter-VSI) is widely used in the modern electric drive field, and is significant to improving electric drive system runnability and energy savings.In drive and control of electric machine was used, when motor was in the retarding braking state, the DC bus-bar voltage of voltage source inverter can raise, if do not controlled, then may surpass the maximum withstand voltage of dc-link capacitance or power device, and caused the hardware damage.Therefore, the inhibition of the living voltage of the pump of dc bus is extremely important for the reliably working of voltage source inverter.
More advanced but the method cost costliness is to adopt PWM (Pulse Width Modulation rectifier, pulse width modulation) rectifier (Malinowski, M. at present; Kazmierkowski, M.P.; Trzynadlowski, A.M. A comparative study of control techniques for PWM rectifiers in AC adjustable speed drives[J] .Power Electronics, IEEE Transactions on Issue Date:Nov.2003Volume:18Issue:6 On page (s): 1390-1396ISSN:0885-8993.) power for VSI provides the direct current mode, when machine operation during in the feedback braking state, DC bus-bar voltage will raise, the PWM rectifier automatically with energy feedback to electrical network.But based on the mode of PWM rectifier, because its cost is higher, is only suitable in being used in the insensitive high-end applications occasion of cost, as is applied to the product of the Siemens SIMATIC S120 series in the fields such as Digit Control Machine Tool.Driving control field in low and middle-end, also have a lot of drivers to be based on the rectifier bridge mode and provide direct current supply for voltage source inverter, under such application conditions, the mode of rate of change that can be by reducing torque current reduces pump up voltage (the Han Li of dc bus; Wen Xuhui; Chen Guilan; Zhao Feng; Gao Jingwen.A Practical Software Strategy to Reduce DC Bus Bar Surge Voltage in AC Drives Fed by VSI [C]. Power Electronics Specialists Conference, 2007.PESC 2007. IEEE Issue Date:17-21 June, 2007 On page (s): 497-502 Location:Orlando, FL ISSN:0275-9306.), or adopt by the mode of DC bus-bar voltage restriction closed-loop control and come self adaptation to reduce scheme (Jiang, the J. of torque current; Holtz, J. An efficient braking method for controlled AC drives with a diode rectifier front end[J] .Industry Applications, IEEE Transactions on Issue Date:Sep/Oct 2001 Volume:37 Issue:5On page (s): 1299-1307 ISSN:0093-9994.).
Although this two schemes can be realized by the scheme of software the DC bus-bar voltage restriction, the shortcoming of following is to sacrifice or reduced the dynamic control performance of torque; And out of control to permagnetic synchronous motor generation under at a high speed weak magnetic state, the occasion that back electromotive force produces fast is also also inapplicable.Another simple common scheme in the middle low power Driven by inverter is brake resistance to be installed suppress too high voltage.Current most control of product method mainly is that simple hardware stagnates chain rate than control mode, when voltage is higher than setting bleed off conducting voltage, by the brake resistance bleed off, when being lower than when setting bleed off and closing voltage, stop bleed off (Zhao Yongcheng, Song Liqun, Zhang Guoli [J]. the design of Energy-consumed Braking Circuit in AC Frequency-variable Speed-adjustable System and realization. Jiangsu electrical equipment 01 phase in 2007 .).This control method is too simple, and hardware modifications parameter trouble breaks down easily and burns out brake resistance.
Summary of the invention
The technical problem to be solved in the present invention is how to optimize the control that the dc bus pump is given birth to voltage, avoids burning out brake resistance.
In order to address the above problem, the invention provides a kind of control device of voltage source inverter brake circuit, comprising:
Be used for driving drive circuit, the pulse width modulation (PWM) waveform maker of braking circuit;
Measuring unit is for the instantaneous voltage of sampled measurements dc bus;
Computing unit is used for calculating according to the resistance R of described instantaneous voltage, braking PWM duty ratio and brake resistance the instantaneous power of described brake resistance;
Low pass filter is used for described instantaneous power is carried out the average power that low-pass filtering obtains described brake resistance;
The first controller is used for the permission maximum power of described brake resistance and the difference of described average power are carried out ratio, integration, obtains the power factor duty ratio;
Second controller is used for obtaining voltage factor duty ratio according to the difference of described instantaneous voltage and default voltage threshold;
Multiplier is for the product that obtains described voltage factor duty ratio and described power factor duty ratio;
Described PWM waveform maker is used for described product as described braking PWM duty ratio, generation PWM waveform, and input to described drive circuit.
Further, described device also comprises:
Amplitude limiter is connected between described the first controller and the described multiplier, is used for described power factor duty cycle limit comprising 0 and 1 between 0 to 1.
Further, described the first controller is a proportion integral control device; Described second controller is a proportion integral control device, perhaps is a Bang-Bang controller.
Further, described second controller is the Bang-Bang controller;
Described default voltage threshold comprises:
The first voltage threshold is bleed off quiescent potential and the stagnant ring value sum of voltage;
The second voltage threshold value is bleed off quiescent potential and voltage the poor of ring value that stagnate;
In the present embodiment, described second controller obtains voltage factor duty ratio according to the difference of described instantaneous voltage and default voltage threshold and specifically refers to:
Described second controller is when described instantaneous voltage during greater than described the first voltage threshold, and the voltage factor duty ratio that obtains is 1; When described instantaneous voltage during less than described second voltage threshold value, the voltage factor duty ratio that obtains is 0; Other situation then keeps the voltage factor duty ratio identical with the last sampling period.
The present invention also provides a kind of control method of voltage source inverter brake circuit, comprising:
The instantaneous voltage of sampled measurements dc bus;
Calculate the instantaneous power of described brake resistance according to the resistance R of described instantaneous voltage, braking PWM duty ratio and brake resistance;
Described instantaneous power is carried out the average power that low-pass filtering obtains described brake resistance;
The permission maximum power of described brake resistance and the difference of described average power are carried out ratio, integration, obtain the power factor duty ratio;
Difference according to described instantaneous voltage and default voltage threshold obtains voltage factor duty ratio;
Obtain the product of described voltage factor duty ratio and described power factor duty ratio;
, generate the PWM waveform, and input to be used to the drive circuit that drives described braking circuit as described braking PWM duty ratio with described product.
Further, after the described step that obtains the power factor duty ratio, obtain also comprising before the step of product of described voltage factor duty ratio and described power factor duty ratio:
Described power factor duty cycle limit between 0 to 1, is comprised 0 and 1.
Further, describedly obtain in the step of voltage factor duty ratio according to the difference of described instantaneous voltage with default voltage threshold, the adoption rate integral way obtains voltage factor duty ratio, or adopts the Bang-Bang mode to obtain voltage factor duty ratio.
Further, adopt the Bang-Bang mode to obtain voltage factor duty ratio;
Described default voltage threshold comprises:
The first voltage threshold is bleed off quiescent potential and the stagnant ring value sum of voltage;
The second voltage threshold value is bleed off quiescent potential and voltage the poor of ring value that stagnate;
The step that described difference according to described instantaneous voltage and default voltage threshold obtains voltage factor duty ratio comprises:
When described instantaneous voltage during greater than described the first voltage threshold, the voltage factor duty ratio that obtains is 1; When described instantaneous voltage during less than described second voltage threshold value, the voltage factor duty ratio that obtains is 0; Other situation then keeps identical voltage factor duty ratio of last sampling period.
Technical scheme of the present invention is for the actual bleed off demand of using brake resistance, a kind of new brake resistance control strategy has been proposed, this control program has taken into full account the rated power of brake resistance, utilization rate, resistance value and maximum the permission had both been considered the demand that DC bus-bar voltage limits the attack time, had also considered maximum power and the attack time restriction of brake resistance, by the co-design of voltage factor passage and power factor passage, realized the optimization bleed off control of brake resistance.The present invention can realize the configuration effort parameter flexibly by software.Technical scheme of the present invention is by based on the Floating-point DSP of TMS320F28335 control platform, with the weak magnetic of permagnetic synchronous motor waited experimental verification validity and practicality out of control.
Description of drawings
Fig. 1 is the schematic block diagram of control device of the voltage source inverter brake circuit of embodiment one;
Fig. 2 is in the example of embodiment one, the schematic diagram of the electric current that DC bus-bar voltage and brake resistance flow through under the weak magnetic out-of-control condition of permagnetic synchronous motor;
Fig. 3 is in the example of embodiment one, the schematic diagram of the electric current that DC bus-bar voltage and bleed off quiescent potential relatively flow through near the DC bus-bar voltage under the condition and brake resistance;
Fig. 4 is in the example of embodiment one, the schematic diagram of the electric current that DC bus-bar voltage flows through greater than the DC bus-bar voltage under the bleed off quiescent potential condition and brake resistance for a long time.
Embodiment
Below in conjunction with drawings and Examples technical scheme of the present invention is described in detail.
Need to prove that if do not conflict, each feature among the embodiment of the invention and the embodiment can mutually combine, all within protection scope of the present invention.In addition, can in the computer system such as one group of computer executable instructions, carry out in the step shown in the flow chart of accompanying drawing, and, although there is shown logical order in flow process, but in some cases, can carry out step shown or that describe with the order that is different from herein.
The control device of embodiment one, a kind of voltage source inverter brake circuit as shown in Figure 1, comprising:
Be used for driving the drive circuit of braking circuit;
Measuring unit, can but be not limited to a voltage sensor, be used for the instantaneous voltage U of sampled measurements dc bus
Dc
Computing unit is used for according to described instantaneous voltage U
Dc, braking PWM duty ratio and brake resistance resistance R calculate the instantaneous power of described brake resistance;
Low pass filter LPF is used for described instantaneous power is carried out the average power that low-pass filtering obtains described brake resistance;
The first controller is used for the permission maximum power of described brake resistance and the difference of described average power are carried out ratio, integration, obtains the power factor duty ratio;
Second controller is used for according to described U
DcObtain voltage factor duty ratio with the difference of the voltage threshold of presetting;
Multiplier is for the product that obtains described voltage factor duty ratio and described power factor duty ratio;
PWM waveform maker is used for described product as described braking PWM duty ratio, generation PWM waveform, and input to described drive circuit.
In the present embodiment, described device can also comprise an amplitude limiter, is connected between described the first controller and the described multiplier, is used for described power factor duty cycle limit comprising 0 and 1 between 0 to 1.
In the present embodiment, described the first controller and described amplitude limiter can be collectively referred to as the power factor passage, and described second controller can be collectively referred to as voltage factor passage.
In the present embodiment, described the first controller can be a proportion integral control device; Described second controller also can be a proportion integral control device, perhaps is a Bang-Bang controller.
The core concept of present embodiment is the maximum bleed off ability that takes full advantage of brake resistance, realizes quick and safe DC bus-bar voltage pump up voltage control.In the scheme of present embodiment, if described power difference (the permission maximum power of described brake resistance and the difference of described average power) is just (being described average power less than default permission maximum power), then according to described voltage duty cycle factor braking, if second controller is the Bang-Bang controller, then be to control braking according to the Bang-Bang mode; If for just (being that described average power meets or exceeds default permission maximum power) then implement the braking bleed off according to the power factor duty ratio that described power difference ratio, integration are obtained.
In the present embodiment, when described second controller was the Bang-Bang controller, described default voltage threshold can comprise:
The first voltage threshold, the stagnant ring value of DC bus-bar voltage when DC bus-bar voltage bleed off quiescent potential (herein referred to as the bleed off quiescent potential) is with braking during for braking (herein referred to as the stagnant ring value of voltage) sum;
The second voltage threshold value is bleed off quiescent potential and voltage the poor of ring value that stagnate.
In the present embodiment, described second controller is according to described U
DcObtaining voltage factor duty ratio with the difference of default voltage threshold specifically can refer to:
Described second controller is worked as U
DcDuring greater than described the first voltage threshold, the voltage factor duty ratio that obtains is 1; Work as U
DcDuring less than described second voltage threshold value, the voltage factor duty ratio that obtains is 0; Other situation then keeps identical voltage factor duty ratio of last sampling period.
As seen, when DC bus-bar voltage greater than bleed off quiescent potential and voltage stagnate the ring value and the time, voltage bleed off circuit working; When DC bus-bar voltage stagnated ring value poor less than bleed off quiescent potential and voltage, voltage bleed off circuit quit work.By the stagnant ring value of voltage is set, can avoid braking circuit in the repeatedly redirect of bleed off working point.
During practical application, also can be designed to described second controller and work as U
DcWhen equaling described first/second voltage threshold value, obtaining voltage factor duty ratio is 1/0.
Present embodiment has been realized the optimal control of braking bleed off owing to consider simultaneously the restriction of dc bus pump up voltage and the restriction of brake resistance power.If control braking according to the Bang-Bang mode, then allow to carry out at short notice heavy-current discharge and process, allow 5 seconds 10 times of overloads such as some resistance; Voltage factor channels designs adopts the ring Bang-Bang control that stagnates can obtain sensitive response speed, and the response of voltage factor passage output can be finished within a sampling period of digitial controller.
In the present embodiment, be the pump liter of control DC bus-bar voltage, can consider following 6 parameters when selecting brake resistance, these parameters can be used as the control setting parameter, and can change.
Table 1, braking control of discharge related setting parameter
When selecting components and parts, the minimum value of the resistance of brake resistance can be according to the rated current of bleed off quiescent potential (maximum DC bus-bar voltage), braking device, and the determining with the derate rate of brake resistance.The minimum value of the resistance of brake resistance=bleed off quiescent potential/(rated current of braking device * use derate rate).The power of brake resistance can calculate selection by following formula:
P＝I×I×R×S。
Wherein, S is that rated current, the R of braking device is the resistance of brake resistance for braking frequency of utilization (the decelerating mode frequency of motor in whole velocity interval), I.
The in short-term shock resistance of brake resistance allows the time to inquire about from the application manual of resistance.
In actual use, in order to improve reliability, the use derate rate of brake resistance has been stipulated the service efficiency of brake resistance, and overheated and damage to avoid brake resistance, it can affect the braking effect of brake unit.The use derate rate setting of brake resistance is lower, and the degree of heat of resistance is less, and the energy that consumes on the resistance is fewer, but braking effect is poorer, and the capacity of brake unit is not fully used yet.
The resistance of brake resistance is R, and PWM braking duty ratio is D ∈ [0,1], and the instantaneous voltage of dc bus is U
DcThen the instantaneous power of the brake resistance consumption that calculates of described computing unit is:
Brake resistance generally has impact resistance, allows the short-time overload operation, but does not allow long-term overload, utilizes the shock resistance time, can realize the fast braking effect of starting stage.
In the present embodiment, the instantaneous power that brake resistance consumes is passed through a low pass filter, and described low pass filter is low-pass first order filter, and its time constant is τ, be input as u, the output x of this low-pass first order filter can be similar to the average power of thinking brake resistance.
In the present embodiment, the S territory transfer function of described low-pass first order filter is as follows:
The difference equation that it is realized in the digital control interior Euler of using method discretization:
Wherein: T is the systematic sampling cycle, and the timeconstantτ of low-pass first order filter generally can be chosen as for 1/3 brake resistance permission attack time.
In application process, definable is also observed following two states, in order to adjust hardware or software parameter according to actual conditions.
The instantaneous utilance of brake resistance power: the instantaneous power of brake resistance and the ratio of rated power.
The average utilization of brake resistance power: the average power of brake resistance and the ratio of rated power.
The maximum power that allows take brake resistance is as reference value, as value of feedback, obtains power factor duty ratio through proportional integral (PI) adjuster and through amplitude limiting processing with the average power of brake resistance.The design of pi regulator is as follows:
Integral element adopts trapezoidal integration to realize discretization, and the difference of increment type PI realizes that equation is as follows in the digitial controller:
Wherein: K
pBe proportional gain, T
IBe integration time constant, T is the systematic sampling cycle, e (k) and e (k-1) be respectively brake resistance power error the sampled value in current sampling period and on the sampled value in a sampling period, described power error is the difference of described reference value and described value of feedback.
Before the resistance braking action occured, PWM braking duty ratio was 0, and the current average power of brake resistance is 0, and pi regulator is in saturation condition, power factor duty ratio output maximum 100%.In case dc bus pump up voltage surpasses set point, within the attack time that brake resistance allows, the average power of brake resistance is with rising, before not above the maximum brake resistance power that allows, the output of power factor duty ratio keeps maximum 100%, thereby can realize in a continuous manner bleed off at the braking initial stage, fast reducing U
DcThe voltage that upper pump rises.If the pump up voltage does not also reduce fully, but surpassed the attack time that brake resistance allows, at this moment then do not allowed continuous braking, will automatically enter the duty ratio mode by pi regulator and brake; Under the duty ratio mode, the mean consumption power on the brake resistance will be controlled at and allow in the maximum power, and this moment is by the automatic computed duty cycle maximum of maximum power setting value.By the maximum duty cycle restriction, guaranteed simultaneously the safety of braking effect and brake resistance.When braking successfully, DC bus-bar voltage is reduced to target voltage when following, and PWM braking duty ratio is 0, and the average power of brake resistance will slowly make zero.
In the present embodiment, the PWM braking duty ratio of braking circuit can be obtained by the product of voltage factor duty ratio and power factor duty ratio, thereby taken into account the limiting voltage demand of dc bus and the Power Limitation demand of brake resistance, realized the braking bleed off effect of optimizing.
The scope of the PWM of braking circuit braking duty ratio be [0,1], can but be not limited to consist of the PWM unit by triangular-wave generator and the digital comparator of digital circuit, control the generation of duty ratio.
In the object lesson of present embodiment, the control device that the dc bus pump is given birth to voltage adopts 32 Floating-point DSP-TMS320F28335 to realize, use the C Programming with Pascal Language to realize whole control algolithms, the function of PWM unit is easy to realize at the DSP of TMS320F28335 Epwm peripheral hardware.Sample frequency is 10K Hz., and motor position is by the resolver absolute value encoder and realize the feedback measurement of position based on the decoding circuit of AD2S1210 chip.Connect by McBsp (as the SPI pattern) Interface realization universal serial bus between DSP and the decoding chip, wherein, the decode precision of AD2S1210 is configured to 12.For improving reliability, main capacitance has adopted the membrane capacitance scheme.
The parameters of four pairs of pole permanent-magnet synchronous machines (PMSM) of experiment usefulness is: rated output power 5.5KW, rated speed 1500rpm, nominal torque 35Nm, coefficient of potential 1.026Vs/rad, moment coefficient 2.18Nm/A, phase winding resistance 0.35 Ω, Ld=7.3mH, Lq=7.8mH.The low-pass first order filter time constant that the brake resistance average power is calculated is that 0.33 times of resistance allows the attack time.
The measurement of DC bus-bar voltage is by the DAC output monitoring of system; The electric current that brake resistance flows through is by electric current cramp joint oscilloscope measurement.Brake resistance resistance 32ohm, brake resistance power 1000KW, the use derate rate of brake resistance is set to 50%, and it is 3s that the in short-term shock resistance of brake resistance allows set of time; The Kp=0.8 of the pi regulator of power factor passage, T
I=0.3s; The voltage hysteresis band is set to 5V.
Experimental result shown in Figure 2 is that PMSM is under the direct current supply condition of 310V in the alternating current 220V rectification, the brake voltage working point arranges 325V, work in the no-load speed control model at PMSM, and magnetic control state processed a little less than having entered, closing control enables, and weak magnetic runaway condition (DC bus-bar voltage U in short-term occurs
Dc＞bleed off quiescent potential U
Brake), the rapid pump liter of DC bus-bar voltage magnetic a little less than PMSM rear voltage out of control, and the triggering braking circuit is with 100% duty ratio work, after time by about 0.5S (the in short-term shock resistance less than brake resistance allows the time), brake voltage is limited in the scope of permission, during produce continuous stalling current in brake resistance.
Experimental result shown in Figure 3 is DC bus-bar voltage U
DcWith bleed off quiescent potential U
BrakeThe electric current that (being set to 305V) relatively flow through near the DC bus-bar voltage under the condition and brake resistance.
Experimental result shown in Figure 4 is DC bus-bar voltage U
DcFor a long time greater than bleed off quiescent potential U
BrakeThe electric current that DC bus-bar voltage under (being set to 285V) condition and brake resistance flow through.Bleed off resistance is in the duty ratio working method, and the maximum power capability that effectively can bear with resistance realizes bleed off.
The control method of embodiment two, a kind of voltage source inverter brake circuit comprises:
The instantaneous voltage U of sampled measurements dc bus
Dc
According to described instantaneous voltage U
Dc, braking PWM duty ratio and brake resistance resistance R calculate the instantaneous power of described brake resistance;
Described instantaneous power is carried out the average power that low-pass filtering obtains described brake resistance;
The permission maximum power of described brake resistance and the difference of described average power are carried out ratio, integration, obtain the power factor duty ratio;
According to described U
DcObtain voltage factor duty ratio with the difference of the voltage threshold of presetting;
Obtain the product of described voltage factor duty ratio and described power factor duty ratio;
, generate the PWM waveform, and input to be used to the drive circuit that drives described braking circuit as described braking PWM duty ratio with described product.
In the present embodiment, after the described step that obtains the power factor duty ratio, obtain can also comprising before the step of product of described voltage factor duty ratio and described power factor duty ratio:
Described power factor duty cycle limit between 0 to 1, is comprised 0 and 1.
In the present embodiment, described according to described U
DcObtain in the step of voltage factor duty ratio with the difference of the voltage threshold of presetting, can obtain voltage factor duty ratio by the adoption rate integral way, or adopt the Bang-Bang mode to obtain voltage factor duty ratio.
In the present embodiment, when adopting the Bang-Bang mode to obtain voltage factor duty ratio, described default voltage threshold can comprise:
The first voltage threshold is bleed off quiescent potential and the stagnant ring value sum of voltage;
The second voltage threshold value is bleed off quiescent potential and voltage the poor of ring value that stagnate.
In the present embodiment, described according to described U
DcThe step that obtains voltage factor duty ratio with the difference of default voltage threshold specifically can comprise:
Work as U
DcDuring greater than described the first voltage threshold, the voltage factor duty ratio that obtains is 1; Work as U
DcDuring less than described second voltage threshold value, the voltage factor duty ratio that obtains is 0; Other situation then keeps identical voltage factor duty ratio of last sampling period.
During practical application, also can be designed to described second controller and work as U
DcWhen equaling described first/second voltage threshold value, obtaining voltage factor duty ratio is 1/0.
The all or part of step of above-described embodiment also can realize with one or more integrated circuits, also can adopt the form of software function module to realize, is not restricted to the combination of the hardware and software of any particular form.
Certainly; the present invention also can have other various embodiments; in the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of claim of the present invention.
Claims (8)
1. the control device of a voltage source inverter brake circuit comprises:
Be used for driving drive circuit, the pulse width modulation (PWM) waveform maker of braking circuit;
Measuring unit is for the instantaneous voltage of sampled measurements dc bus;
It is characterized in that, also comprise:
Computing unit is used for calculating according to the resistance R of described instantaneous voltage, braking PWM duty ratio and brake resistance the instantaneous power of described brake resistance;
Low pass filter is used for described instantaneous power is carried out the average power that low-pass filtering obtains described brake resistance;
The first controller is used for the permission maximum power of described brake resistance and the difference of described average power are carried out ratio, integration, obtains the power factor duty ratio;
Second controller is used for obtaining voltage factor duty ratio according to the difference of described instantaneous voltage and default voltage threshold;
Multiplier is for the product that obtains described voltage factor duty ratio and described power factor duty ratio;
Described PWM waveform maker is used for described product as described braking PWM duty ratio, generation PWM waveform, and input to described drive circuit.
2. device as claimed in claim 1 is characterized in that, also comprises:
Amplitude limiter is connected between described the first controller and the described multiplier, is used for described power factor duty cycle limit comprising 0 and 1 between 0 to 1.
3. device as claimed in claim 1 is characterized in that:
Described the first controller is a proportion integral control device; Described second controller is a proportion integral control device, perhaps is a Bang-Bang controller.
4. device as claimed in claim 1 is characterized in that:
Described second controller is the Bang-Bang controller;
Described default voltage threshold comprises:
The first voltage threshold is bleed off quiescent potential and the stagnant ring value sum of voltage;
The second voltage threshold value is bleed off quiescent potential and voltage the poor of ring value that stagnate;
Wherein, described second controller obtains voltage factor duty ratio according to the difference of described instantaneous voltage and default voltage threshold and specifically refers to:
Described second controller is when described instantaneous voltage during greater than described the first voltage threshold, and the voltage factor duty ratio that obtains is 1; When described instantaneous voltage during less than described second voltage threshold value, the voltage factor duty ratio that obtains is 0; Other situation then keeps the voltage factor duty ratio identical with the last sampling period.
5. the control method of a voltage source inverter brake circuit comprises:
The instantaneous voltage of sampled measurements dc bus;
Calculate the instantaneous power of described brake resistance according to the resistance R of described instantaneous voltage, braking PWM duty ratio and brake resistance;
Described instantaneous power is carried out the average power that low-pass filtering obtains described brake resistance;
The permission maximum power of described brake resistance and the difference of described average power are carried out ratio, integration, obtain the power factor duty ratio;
Difference according to described instantaneous voltage and default voltage threshold obtains voltage factor duty ratio;
Obtain the product of described voltage factor duty ratio and described power factor duty ratio;
, generate the PWM waveform, and input to be used to the drive circuit that drives described braking circuit as described braking PWM duty ratio with described product.
6. method as claimed in claim 5 is characterized in that, after the described step that obtains the power factor duty ratio, obtain also comprising before the step of product of described voltage factor duty ratio and described power factor duty ratio:
Described power factor duty cycle limit between 0 to 1, is comprised 0 and 1.
7. method as claimed in claim 5 is characterized in that:
Describedly obtain in the step of voltage factor duty ratio according to the difference of described instantaneous voltage with default voltage threshold, the adoption rate integral way obtains voltage factor duty ratio, or adopts the Bang-Bang mode to obtain voltage factor duty ratio.
8. method as claimed in claim 5 is characterized in that:
Adopt the Bang-Bang mode to obtain voltage factor duty ratio;
Described default voltage threshold comprises:
The first voltage threshold is bleed off quiescent potential and the stagnant ring value sum of voltage;
The second voltage threshold value is bleed off quiescent potential and voltage the poor of ring value that stagnate;
The step that described difference according to described instantaneous voltage and default voltage threshold obtains voltage factor duty ratio comprises:
When described instantaneous voltage during greater than described the first voltage threshold, the voltage factor duty ratio that obtains is 1; When described instantaneous voltage during less than described second voltage threshold value, the voltage factor duty ratio that obtains is 0; Other situation then keeps identical voltage factor duty ratio of last sampling period.
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| EP3054583B1 (en) | 2015-02-06 | 2020-07-15 | ABB Schweiz AG | Method and system for estimating differential inductances in an electric machine |
| CN105958871A (en) * | 2016-03-09 | 2016-09-21 | 广东美的制冷设备有限公司 | Air conditioner and compressor thereof shutdown control method and device |
| CN106443241B (en) * | 2016-08-31 | 2019-08-16 | 株洲中车时代电气股份有限公司 | A kind of monitoring method, device and the guard method of vehicle-mounted braking resistor, device |
| US10775431B2 (en) * | 2017-06-28 | 2020-09-15 | Sandisk Technologies Llc | Systems and methods for duty cycle measurement, analysis, and compensation |
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