CN109194214A - A kind of three-level synchronous generator transient overvoltage suppression circuit and its implementation - Google Patents
A kind of three-level synchronous generator transient overvoltage suppression circuit and its implementation Download PDFInfo
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- CN109194214A CN109194214A CN201811386980.8A CN201811386980A CN109194214A CN 109194214 A CN109194214 A CN 109194214A CN 201811386980 A CN201811386980 A CN 201811386980A CN 109194214 A CN109194214 A CN 109194214A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/102—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of transients
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Abstract
The present invention proposes that a kind of three-level synchronous generator transient overvoltage suppression circuit and its implementation, circuit include generator three-phase voltage sample circuit, virtual value counting circuit, DSP processing circuit, IGBT drive circuit, energy absorption circuit；When DSP detects three-level synchronous generator output over-voltage, DSP output voltage adjusts disable signal to voltage controller, cut off the exciting current of exciter, DSP exports demagnetization investment signal to de-excitation resistance simultaneously, by the exciting current of generator in the form of resistance heating rapid deterioration, after a certain period of time, DSP is sent according to the pwm signal of the output variable duty cycle of the overvoltage value adaptability currently acquired to power absorption resistance control switch IGBT, power absorption resistance investment, rapid transient suppression overvoltage, voltage is seamlessly transitted to normal range (NR).This method can be effectively suppressed because of overvoltage caused by under high power load excision or other operating conditions, and the overvoltage quick and smooth is transitioned into steady state working voltage before main contactor disconnects, realizes uninterrupted power supply.
Description
Technical field
The invention belongs to aviation alternating current power-generating system fields, are related to a kind of three-level synchronous generator transient overvoltage inhibition electricity
Road and its implementation.
Background technique
With the development of the more power technologies of aviation, load entered with the high-power epoch for characteristic feature.When system carries out greatly
When power termination cuts off or has energy feedback type load shock, due to the protection time-delay characteristic of three-level voltage controller of synchronous generator
Property and contactor intrinsic response time, before contactor has not carried out opening operation, generator end output voltage seriously surpasses
National military standard voltage threshold is crossed, output end generates serious overvoltage phenomenon, leads to the failure of rear class electrical equipment or system-level guarantor
Shield.
For existing aviation three-level synchronous generator when facing transient overvoltage problem, the method generallyd use in engineering is logical
It crosses generator voltage controller and carries out voltage adjusting and using transient voltage suppressor (TVS) and varistor come transient suppression mistake
Voltage.When overvoltage generates, voltage is adjusted to by voltage controller to be met in voltage range as defined in national military standard, if voltage control
Device processed cannot achieve Overvoltage suppressing, then carries out system protection by modes such as disconnected excitation, disconnected main contactors, cut off main power source and
Rear class electrical equipment.TVS fast response time, it is small in size, but capacitor is larger (tens arrive several hundred pF), and resistance to electric current is smaller, and punctures
Voltage only has several particular values, since aerogenerator load current is larger, easily leads to TVS and is burned, reliability is low.Pressure-sensitive electricity
Resistance is not high because of its service life number and puncture short failure mode, reliability.In harsh aeronautical power generation working environment, above-mentioned three
The means for the transient suppression overvoltage that kind mainly uses at present, cannot quickly press down overvoltage within the time as defined in national military standard
Stable state safe voltage is made and be smoothly transitted into, provides uninterrupted power supply for load equipment on machine.
Summary of the invention
Inhibit to solve the problems, such as that aviation three-level synchronous generator exports transient overvoltage, the present invention provides a kind of fast and effective
Aviation three-level synchronous generator transient overvoltage suppression circuit and its method, this method can be effectively suppressed because high power load is cut
Remove or other operating conditions under caused overvoltage, main contactor disconnect before by the overvoltage quick and smooth be transitioned into steady operation electricity
Pressure, realizes uninterrupted power supply, as far as possible guarantee power grid and rear class electrical equipment is safe and reliable, steady operation, promotes onboard electric
The robustness of system.
The main principle design of the present invention is: when digital signal processor (DSP) detects that three-level synchronous generator exports
When overvoltage, DSP output voltage adjusts disable signal and cuts off the exciting current of exciter to voltage controller, while DSP is exported
Demagnetization put into signal to de-excitation resistance, by the exciting current of generator in the form of resistance heating rapid deterioration, after a certain period of time,
DSP send to the control of power absorption resistance according to the pwm signal of the output variable duty cycle of the overvoltage value adaptability currently acquired and opens
IGBT, power absorption resistance investment are closed, rapid transient suppression overvoltage seamlessly transits voltage to normal range (NR).
The technical solution of the present invention is as follows:
A kind of three-level synchronous generator transient overvoltage suppression circuit, it is characterised in that: including generator three-phase electricity
Press sample circuit, virtual value counting circuit, DSP processing circuit, IGBT drive circuit, energy absorption circuit；
Generator three-phase voltage sample circuit input signal is the high electricity of main generator three-phase alternating current in three-level synchronous generator
Pressure, provides low-voltage input signal for virtual value counting circuit；It is low that virtual value counting circuit obtains three-phase alternating current after resolving
The virtual value of voltage provides AD sampled input signal for DSP processing circuit；DSP processing circuit include dsp chip and for DSP just
Peripheral circuit needed for normal high-speed cruising and debugging, DSP processing circuit adjust disable signal according to set algorithm output voltage, go out
Magnetic signal and variable duty cycle pwm signal；IGBT drive circuit carries out shaping to variable duty cycle pwm signal and promotes driving capability,
To control the investment or excision of power absorption resistance in energy absorption circuit.
Further preferred embodiment, a kind of three-level synchronous generator transient overvoltage suppression circuit, it is characterised in that:
The energy absorption circuit includes power absorption resistance, full-bridge rectification module and IGBT；The prime of full-bridge rectification module inputs
The three-phase alternating current of main generator output, the direct current after the rectification of full-bridge rectification module is electrically connected power absorption resistance, and utilizes
The on-off of IGBT controls whether power absorption resistance puts into.
Further preferred embodiment, a kind of three-level synchronous generator transient overvoltage suppression circuit, it is characterised in that:
The IGBT drive circuit carries out shaping filter to the pwm signal that DSP processing circuit exports, and is then improved and is driven using amplifying element
Kinetic force.
Further preferred embodiment, a kind of three-level synchronous generator transient overvoltage suppression circuit, it is characterised in that:
The generator three-phase voltage sample circuit carries out main generator three-phase alternating current high voltage in the three-level synchronous generator of input
Electric resistance partial pressure and capacitor frequency compensation export three-phase alternating current low-voltage.
Utilize foregoing circuit realize three-level synchronous generator transient overvoltage inhibit method, it is characterised in that: including with
Lower step:
Step 1: AD sampling being carried out to main generator output three-phase alternating voltage virtual value in three-level synchronous generator, is obtained
Current main generator output voltage virtual value U；
Step 2: by the threshold voltage U of current main generator output voltage virtual value U and setting2With threshold voltage U1It carries out
Following logic judgment, wherein U1< U2:
If U >=U2, then DSP output voltage adjusts disable signal and demagnetization puts into signal, and sets one section of delay time
Tdelay, after reaching delay time, then judge main generator current output voltage virtual value U and setting threshold voltage U1Size
Relationship, such as U >=U1, three are entered step, such as U < U1, enter step five；Wherein delay time TdelaySetting should be ensured that and reaching
To after delay time, voltage effective value U < U2；
IfGo to step three；
IfGo to step five；
Step 3:DSP exports demagnetization cut-off signals, and it is constant that voltage adjusts disable signal, while DSP is according to currently acquiring
Voltage effective value U exports the pwm signal of variable duty cycle, duty ratio D=k × U of pwm signal2/ R, k are the proportionality coefficient of setting,
R is power absorption resistance；
Step 4: the pwm signal duty ratio obtained according to step 3, setting PWM register carry out PWM output, subsequently into
Step 6；
Step 5:DSP exports demagnetization cut-off signals and complete low level pwm signal, does not put into energy absorption circuit, simultaneously
DSP exports pressure regulation signal, only relies on voltage controller regulator generator output end voltage；
Step 6: repeating step 1 to step 5.
Further preferred embodiment, a kind of method that three-level synchronous generator transient overvoltage inhibits, feature exist
In: the AD of main generator output three-phase alternating voltage virtual value in three-level synchronous generator is sampled in step 1, then utilizes root
Sampled value is calibrated according to the calibration algorithm that DSP internal reference source is formulated, the signal after sampling calibration is calculated with mean filter
Method is handled, and current main generator output voltage virtual value U is calculated
Wherein Ud is sampling, calibration, filtered voltage value, and Du is that virtual voltage and sampled voltage convert ratio.
Beneficial effect
The present invention provides a kind of three-level synchronous generator transient overvoltage suppressing methods, carry out algorithm control, wink by DSP
Demagnetization algorithm is first carried out when state overtension, power absorption resistance is put into again after a certain period of time and inhibits overvoltage, if voltage reduces
To a certain degree when adjusted again by voltage controller.The inventive method can quickly inhibit transient overvoltage, and smooth transition is arrived
Steady state working voltage, transient response real-time is high, and control algolithm is easy, can ensure that airborne power supply system uninterruptedly supplies as far as possible
The safety of electricity and rear class electrical equipment, avoids passing through generator logout when transient overvoltage occurs to realize electric network protection, has
Effect promotes the robustness of electric system.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is system function architecture diagram；
Fig. 2 is the algorithm flow chart of software program；
Fig. 3 is exciter demagnetization circuit；
Fig. 4 is energy absorption circuit.
For exciter demagnetization circuit by DSP output demagnetization signal control, FIELD+, FIELD- connect excitation winding both ends respectively.
When relay U1 being driven to disconnect, de-excitation resistance is linked into continuous current circuit.POWER A, POWER B, POWERC are that main generator is defeated
Generator output three-phase electricity is rectified into direct current by rectification module (D1-D6), the pwm signal control exported using DSP by outlet
The on/off of IGBT processed, and then control whether power absorption resistance (R1, R2) puts into.
Specific embodiment
The embodiment of the present invention is described below in detail, the embodiment is exemplary, it is intended to it is used to explain the present invention, and
It is not considered as limiting the invention.
When airborne high power load excision or other operating conditions cause aviation three-level synchronous generator to export transient overvoltage,
Under the premise of voltage controller quickly and effectively cannot inhibit and adjust, can only be in such a way that de excitation magnetic breaks main contactor
Blanket insurance shield.Inhibit to solve the problems, such as that aviation three-level synchronous generator exports transient overvoltage, realizes uninterrupted under over-voltage condition
Power supply, the present invention is intended to provide a kind of quickly and effectively aviation three-level synchronous generator transient overvoltage suppression circuit and inhibition side
Method.
For the inventive method as a kind of novel Overvoltage suppressing method, control circuit is simple, and algorithm real-time is high, can be effective
Transient overvoltage caused by inhibiting because of high power load excision or other failures, it is before main contactor disconnects that the overvoltage is quick
Be smoothly transitted into steady state working voltage, realize uninterrupted power supply, as far as possible guarantee power-supply system and rear class electrical equipment safety, can
It leans on, steady operation, promotes the robustness of onboard electric systems.
The following further describes the present invention with reference to the drawings:
The present invention is according to Fig. 1, Fig. 2, Fig. 3, system function framework, software program flow chart and hardware circuit shown in Fig. 4
Transient overvoltage technical research is carried out, can be applied to the airborne frequency conversion in China, in constant frequency alternating current power-generating system, Overvoltage suppressing effect
Obviously.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, a kind of three-level synchronous generator Overvoltage suppressing method include hardware components and
Software section.
Wherein hardware circuit include generator three-phase voltage sample circuit, virtual value counting circuit, DSP processing circuit,
IGBT drive circuit, energy absorption circuit.It is defeated that generator three-phase voltage sample circuit for virtual value counting circuit provides low-voltage
Enter signal, provides AD sampled input signal after the resolving of virtual value counting circuit for DSP processing circuit, DSP processing circuit is main
It is included as associated peripheral circuits needed for the normal high-speed cruising of DSP and debugging, DSP processing circuit is according to set algorithm output voltage
Disable signal, demagnetization signal and variable duty cycle pwm signal are adjusted, IGBT drive circuit mainly carries out variable duty cycle pwm signal
Shaping and promotion driving capability, to control power absorption resistance investment or excision in energy absorption circuit.
The generator three-phase voltage sample circuit: input signal is main generator three-phase alternating current in three-level synchronous generator
High voltage, by electric resistance partial pressure and capacitor frequency compensation, output signal is three-phase alternating current low-voltage, calculates electricity for rear class virtual value
Road provides input signal.
The virtual value counting circuit: it inputs as the three-phase alternating current low voltage signal after partial pressure and frequency compensation, through too fast
Fast virtual value computing chip and periphery matching device are completed virtual value and are calculated, and export as the virtual value of three-phase alternating current low-voltage, have
Effect is eliminated by power electronic devices, nonlinear load bring harmonic pollution signal.
The DSP processing circuit: using high-speed dsp chip, constructs system peripherals circuit, mainly includes clock circuit, multiple
Position circuit, JTAG interface circuit, power circuit, watchdog circuit, AD sampling clamp protection circuits, RS422 interface circuit etc..
The IGBT drive circuit: carrying out shaping filter to pwm signal first, prevent High-frequency Interference, then utilizes amplification
Link improves the driving capability of power switch tube, is effectively reduced power switch tube fever phenomenon.
The energy absorption circuit: mainly including power absorption resistance, rectification module and IGBT, and the prime of rectification module is defeated
Enter the three-phase alternating current for main generator output, the direct current after rectified module rectification connects power absorption resistance, utilizes
The on/off of IGBT controls whether power absorption resistance puts into.
Software algorithm part uses assembler language and C language hybrid programming, compiles at the DSP Code Composer of TI
And debugging.Algorithm samples main generator output three-phase voltage virtual value first, is calibrated, is filtered in advance in a program,
By itself and setting threshold voltage U2Compare: voltage is higher than U2When, DSP output voltage adjust disable signal and demagnetization put into signal to
Voltage controller judges whether sampled voltage is higher than setting threshold voltage U after one section of delay1If being higher than, DSP output
Demagnetization cut-off signals, while DSP output adapts to the pwm control signal under current voltage operating condition until voltage is suppressed and steady mistake
It crosses to steady state working voltage, if being lower than U1, then demagnetization signal is closed, while release voltage adjusts disable signal；Voltage is lower than U2When,
DSP output demagnetization cut-off signals and voltage adjust disable signal and send to voltage controller, while DSP output adapts to current voltage work
Pwm control signal under condition is until voltage is suppressed simultaneously smooth transition to steady state working voltage.
So specific step is as follows for whole system software algorithm:
Step 1: system mode, peripheral hardware register and initialization of variable；
Step 2: it opens CPU and interrupts；
Step 3: entering main circulating program, with power supply system processor real-time communication, transmits current system state information.
After wherein entering CPU interruption service, using suppressing method proposed by the present invention:
Step 1: the AD sampling of main generator output three-phase alternating voltage virtual value first in progress three-level synchronous generator,
Sampled value is calibrated followed by the calibration algorithm formulated according to DSP internal reference source, further to eliminate interference, to adopting
Sample calibration after signal handled with Mean Filtering Algorithm, calculate current main generator output voltage virtual value U (Wherein Ud is sampling, calibration, filtered voltage value, and Du is that virtual voltage and sampled voltage are converted
Than)；
Step 2: by the threshold voltage U of current main generator output voltage virtual value U and setting2With threshold voltage U1It carries out
Following logic judgment, wherein U1< U2:
If U >=U2, then DSP output voltage adjusts disable signal and demagnetization puts into signal, and sets one section of delay time
Tdelay, (delay time of the setting should be ensured that after reaching delay time, voltage effective value U < U2), when reaching delay
Between after, judge more current main generator output voltage virtual value U and setting threshold voltage U1Size relation, if U >=U1, into
Enter step 3, ifEnter step five；
IfGo to step three；
IfGo to step five；
Step 3:DSP exports demagnetization cut-off signals, and it is constant that voltage adjusts disable signal, while DSP is according to currently acquiring
Voltage effective value U exports the pwm signal of variable duty cycle, duty ratio D=k × U of pwm signal2/ R, k are the proportionality coefficient of setting,
R is power absorption resistance；
Step 4: according to PWM output duty cycle, PWM register being set and carries out PWM output, subsequently into step 6；
Step 5:DSP exports demagnetization cut-off signals and complete low level pwm signal, i.e., does not put into demagnetization and energy absorption is returned
Road, while DSP exports pressure regulation signal, that is, only relies on voltage controller regulator generator output end voltage；
Step 6: interrupting out, repeat step 1~step 5 in next interruption.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.
Claims (6)
1. a kind of three-level synchronous generator transient overvoltage suppression circuit, it is characterised in that: sampled including generator three-phase voltage
Circuit, virtual value counting circuit, DSP processing circuit, IGBT drive circuit, energy absorption circuit；
Generator three-phase voltage sample circuit input signal is main generator three-phase alternating current high voltage in three-level synchronous generator, is
Virtual value counting circuit provides low-voltage input signal；Virtual value counting circuit obtains three-phase alternating current low-voltage after resolving
Virtual value provides AD sampled input signal for DSP processing circuit；DSP processing circuit includes dsp chip and is the normal high speed of DSP
Peripheral circuit needed for operation and debugging, DSP processing circuit adjust disable signal, demagnetization signal according to set algorithm output voltage
And variable duty cycle pwm signal；IGBT drive circuit carries out shaping to variable duty cycle pwm signal and promotes driving capability, to control
The investment or excision of power absorption resistance in energy absorption circuit processed.
2. a kind of three-level synchronous generator transient overvoltage suppression circuit according to claim 1, it is characterised in that: the energy
Measuring absorbing circuit includes power absorption resistance, full-bridge rectification module and IGBT；It generates electricity based on the prime input of full-bridge rectification module
The three-phase alternating current of machine output, the direct current after the rectification of full-bridge rectification module is electrically connected power absorption resistance, and utilizes IGBT's
On-off controls whether power absorption resistance puts into.
3. a kind of three-level synchronous generator transient overvoltage suppression circuit according to claim 2, it is characterised in that: described
IGBT drive circuit carries out shaping filter to the pwm signal that DSP processing circuit exports, and then improves driving energy using amplifying element
Power.
4. according to claim 1 or a kind of 3 three-level synchronous generator transient overvoltage suppression circuits, it is characterised in that: institute
It states generator three-phase voltage sample circuit and electricity is carried out to main generator three-phase alternating current high voltage in the three-level synchronous generator of input
Resistance partial pressure and capacitor frequency compensation, export three-phase alternating current low-voltage.
5. realizing the method that three-level synchronous generator transient overvoltage inhibits using circuit described in claim 1, it is characterised in that:
The following steps are included:
Step 1: AD sampling being carried out to main generator output three-phase alternating voltage virtual value in three-level synchronous generator, is obtained current
Main generator output voltage virtual value U；
Step 2: by the threshold voltage U of current main generator output voltage virtual value U and setting2With threshold voltage U1It carries out as follows
Logic judgment, wherein U1< U2:
If U >=U2, then DSP output voltage adjusts disable signal and demagnetization puts into signal, and sets one section of delay time Tdelay, when
After reaching delay time, then judge main generator current output voltage virtual value U and setting threshold voltage U1Size relation, such as
U≥U1, three are entered step, such as U < U1, enter step five；Wherein delay time TdelaySetting should be ensured that reaching delay
After time, voltage effective value U < U2；
If U1≤ U < U2, go to step three；
If U < U1, go to step five；
Step 3:DSP exports demagnetization cut-off signals, and it is constant that voltage adjusts disable signal, while DSP is according to the voltage currently acquired
Virtual value U exports the pwm signal of variable duty cycle, duty ratio D=k × U of pwm signal2/ R, k are the proportionality coefficient of setting, and R is
Power absorption resistance；
Step 4: the pwm signal duty ratio obtained according to step 3, setting PWM register carries out PWM output, subsequently into step
6；
Step 5:DSP exports demagnetization cut-off signals and complete low level pwm signal, does not put into energy absorption circuit, while DSP is defeated
Pressure regulation signal out only relies on voltage controller regulator generator output end voltage；
Step 6: repeating step 1 to step 5.
6. a kind of method that three-level synchronous generator transient overvoltage inhibits according to claim 5, it is characterised in that: step
The AD of main generator output three-phase alternating voltage virtual value in three-level synchronous generator is sampled in 1, is then utilized according in DSP
The calibration algorithm that portion's a reference source is formulated calibrates sampled value, at the signal Mean Filtering Algorithm after sampling calibration
Reason, calculates current main generator output voltage virtual value U
Wherein Ud is sampling, calibration, filtered voltage value, and Du is that virtual voltage and sampled voltage convert ratio.
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| CN201811386980.8A CN109194214B (en) | 2018-11-20 | 2018-11-20 | Transient overvoltage suppression circuit of three-stage synchronous generator and implementation method thereof |
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Cited By (2)
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| CN110798108A (en) * | 2019-11-07 | 2020-02-14 | 陕西航空电气有限责任公司 | Grading unloading method for overvoltage suppression device of three-phase variable-frequency alternating-current power generation system |
| CN112350522A (en) * | 2020-09-25 | 2021-02-09 | 华为技术有限公司 | Protection device and brushless motor |
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| CN112350522B (en) * | 2020-09-25 | 2022-08-09 | 华为技术有限公司 | Protection device and brushless motor |
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| Publication number | Publication date |
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| CN109194214B (en) | 2021-10-22 |
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