CN107591789B - A kind of three phase variable frequency alternating current power-generating system over-voltage suppression device - Google Patents
A kind of three phase variable frequency alternating current power-generating system over-voltage suppression device Download PDFInfo
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Abstract
The present invention proposes a kind of three phase variable frequency alternating current power-generating system over-voltage suppression device, including generator three-phase voltage sample circuit, virtual value counting circuit, comparison circuit, excitation negative voltage regulator circuit, CPLD processing circuit, DSP processing circuit, IGBT drive circuit and energy absorption loop of power circuit.The present invention and generator voltage controller cooperate, after over-voltage generation, inhibit device to send voltage by transient overvoltage and adjusts disable signal, the secondary exciting current of generator voltage controller no longer supply generator, the electric energy in generator only carry out energy converting between mechanical by the dump energy in main generator excitation coil.Inhibit device to the controlled absorbed of electromechanical energy by transient overvoltage; on the one hand the transient overvoltage in power grid can be effectively suppressed; prevent power-supply system caused by over-voltage from protecting; on the other hand network voltage may be implemented by the smooth transition of transient high voltages to steady state voltage, improves safety, reliability and the robustness of power grid.
Description
Technical field
The invention belongs to aviation variable-frequency alternating current power generation system fields, are related to three-level formula frequency conversion generator transient overvoltage dynamic
Suppression technology, specially a kind of three phase variable frequency alternating current power-generating system over-voltage suppression device.
Background technique
High-power frequency conversion alternating current power-generating system is when carrying out big capacity load switching or breaking down, due to generator voltage
The protection control time-delay characteristics of adjuster and contactor intrinsic response time, therefore during generator contactor not yet disconnects,
Generator output voltage is seriously more than voltage threshold, and output end generates severe overvoltage, and rear class electrical equipment is caused to break down
Or system protection.
At present mainly using transient voltage suppressor (TVS) and varistor come transient suppression overvoltage in engineering.TVS is rung
Answer speed fast, it is small in size, but capacitor is larger (tens arrive several hundred pF), and resistance to electric current is smaller, and breakdown voltage only has several particular values,
Since aerogenerator load current is larger, easily leads to TVS and be burned, reliability is low.Varistor is because of its service life number and hits
Short circuit failure mode is worn, reliability is not high.The means of the above two transient suppression overvoltage mainly used at present, are being applied to
It is generally existing to be unsatisfactory for high reliability request, the limited problem of applicability when in the harsh working environment of aeronautical power generation.
For existing aerogenerator when facing transient overvoltage problem, the means mainly used are exactly to pass through generator voltage
Adjuster is adjusted, and voltage is adjusted to the voltage range for meeting military standard of China, if controller cannot achieve adjusting and want
It asks, then carries out system protection by modes such as disconnected excitation, disconnected main contactors, but these means all can not fundamentally quickly and effectively
Absorption transient suppression overvoltage.
Summary of the invention
In order to solve the problems existing in the prior art, the present invention proposes a kind of three phase variable frequency alternating current power-generating system over-voltage suppression dress
Set, the device can quickly and effectively over-voltage caused by the release of transient suppression energy, realize the inhibition of relevant to transient overvoltage dynamic and
To the smooth transition of steady state voltage, as far as possible guarantee power grid and safe and reliable, the steady operation of rear class electrical equipment, electricity is promoted
The robustness of source system.
Cardinal principle of the invention is cooperated with generator voltage controller, after over-voltage generation, by transient overvoltage
Inhibit device to send voltage and adjusts disable signal, the secondary exciting current of generator voltage controller no longer supply generator, power generation
Electric energy in machine only carries out energy converting between mechanical by the dump energy in main generator excitation coil.Inhibit to fill by transient overvoltage
The controlled absorbed to electromechanical energy is set, the transient overvoltage in power grid on the one hand can be effectively suppressed, prevents power supply caused by over-voltage
On the other hand system protection may be implemented network voltage by the smooth transition of transient high voltages to steady state voltage, improve power grid
Safety, reliability and robustness.
The technical solution of the present invention is as follows:
A kind of three phase variable frequency alternating current power-generating system over-voltage suppression device, it is characterised in that: including generator three-phase electricity
Press sample circuit, virtual value counting circuit, comparison circuit, excitation negative voltage regulator circuit, CPLD processing circuit, DSP processing circuit,
IGBT drive circuit and energy absorption loop of power circuit；
The input of the generator three-phase voltage sample circuit is main generator three-phase voltage AC signal, and believes input
Number electric resistance partial pressure and capacitor frequency compensation are carried out, exported as three-phase low-voltage AC signal；
The input of the virtual value counting circuit is the three-phase low-voltage AC signal after partial pressure, and is had to input signal
Valid value calculates, and exports as the virtual value of three-phase low-voltage alternating voltage；
The input of the comparison circuit is the three-phase low-voltage AC signal after partial pressure, and the three-phase low-voltage of input is exchanged and is believed
Number with setting reference voltage be compared, export comparison result；
The input of the excitation negative voltage regulator circuit is the voltage signal at controller excitation negative, and is carried out to input signal steady
Pressure processing, output signal are sent to CPLD processing circuit；
The input of the CPLD processing circuit be comparison circuit output comparison result, CPLD processing circuit according to compare knot
Fruit judges whether to export the pressure regulation that pressure regulation disable signal controls generator regulator to controller, wherein when generator three-phase electricity
In pressure when any one phase output over-voltage, control generator regulator shutdown；It is steady that the CPLD processing circuit also inputs excitation negative
The output signal of volt circuit, and judge whether that exporting PWM enable signal send to DSP according to the output signal of excitation negative voltage regulator circuit
Processing circuit；
The input of the DSP processing circuit is the virtual value and PWM enable signal of three-phase low-voltage alternating voltage；At DSP
Circuit is managed according to the control method of setting, the pwm signal with corresponding driving capability is exported, is provided for late-class circuit IGBT on-off
Control signal；
The input of the IGBT drive circuit is the pwm signal of DSP processing circuit output, and IGBT drive circuit is through overmatching
Electric signal input is provided for IGBT grid, source electrode, drain electrode；
The energy absorption loop of power circuit is made of rectification module, IGBT and power absorption resistance；Rectification module is by main hair
Motor three-phase voltage AC signal is transformed to direct current；The pwm signal of DSP processing circuit output is opened or is closed by controlling IGBT
Investment or excision disconnected and then that power absorption resistance can be controlled.
Further preferred embodiment, a kind of three phase variable frequency alternating current power-generating system over-voltage suppression device, it is characterised in that:
DSP processing circuit samples the virtual value of the three-phase low-voltage alternating voltage of input and judges whether overvoltage；If crossing electricity
Pressure, then according to the PWM enable signal exported after overvoltage value and CPLD logical process, export the pwm control signal of variable duty cycle,
Keep the transient power for controlling power absorption resistance investment directly proportional to overvoltage value.
Beneficial effect
The present invention is by quickly and effectively detecting transient overvoltage, the PWM of the control algolithm output variable duty cycle according to setting
Wave controls the making time of power absorption resistance, realizes aviation variable-frequency alternating current power generation system since load switching or failure are drawn
The fast and effective inhibition of the transient overvoltage risen and high voltage transient guarantee rear class electrical equipment to the smooth transition of steady state voltage
Safety.The configuration frame of changeable existing power supply system simultaneously, increases new growth engines.
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 system function framework diagram；
Fig. 2: the simulation model established in embodiment；
Fig. 3: the simulation result in embodiment.
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.
The present invention is intended to provide a kind of quickly and effectively aviation variable-frequency alternating current power generation system transient overvoltage inhibits device, the dress
Set can quickly and effectively over-voltage caused by the release of transient suppression energy, realize that relevant to transient overvoltage dynamic inhibits and electric to stable state
The smooth transition of pressure, as far as possible guarantee power grid and safe and reliable, the steady operation of rear class electrical equipment, promote power-supply system
Robustness.
Hardware design of the present invention mainly includes that generator three-phase voltage sample circuit, virtual value counting circuit, comparison are electric
Road, excitation negative voltage regulator circuit, CPLD processing circuit, DSP processing circuit, IGBT drive circuit, energy absorption loop of power circuit etc..?
Control algolithm in DSP processing circuit comprehensively considers according to the characteristic of motor and the characteristic of pressure regulator, guarantee resistance can
Under use condition, realize that overvoltage dynamic is suppressed to the smooth transition of the stabilization of power grids by the absorption power curve of setting.
Three phase variable frequency alternating current power-generating system over-voltage suppression device in the present invention, including generator three-phase voltage sample circuit,
Virtual value counting circuit, comparison circuit, excitation negative voltage regulator circuit, CPLD processing circuit, DSP processing circuit, IGBT drive circuit
With energy absorption loop of power circuit.
The input of the generator three-phase voltage sample circuit is main generator three-phase voltage AC signal, and believes input
Number electric resistance partial pressure and capacitor frequency compensation are carried out, exports as three-phase low-voltage AC signal, provided for subsequent virtual value counting circuit
Input signal.
The input of the virtual value counting circuit is the three-phase low-voltage AC signal after partial pressure, by being quickly and effectively worth calculating
Chip carries out virtual value calculating to input signal, exports as the virtual value of three-phase low-voltage alternating voltage, effectively eliminates by electric power electricity
Sub- device, nonlinear load bring harmonic signal.
The input of the comparison circuit is the three-phase low-voltage AC signal after generator three-phase high voltage AC signal partial pressure,
And be compared the three-phase low-voltage AC signal of input with the reference voltage of setting, comparison result is exported, when sensitive spot voltage
Comparison circuit exports high level when higher than setting overvoltage thresholding, high when sense voltage is lower than setting overvoltage thresholding mutually to limit
Export low level.
The input of the excitation negative voltage regulator circuit is the voltage signal at controller excitation negative, and is carried out to input signal steady
Pressure processing, output signal are sent to CPLD processing circuit.
The input of the CPLD processing circuit is the comparison result of comparison circuit output, and CPLD processing circuit is comprehensive by logic
After conjunction, judge whether to export the pressure regulation that pressure regulation disable signal controls to controller generator regulator according to comparison result,
In when phase output over-voltage any one in generator three-phase voltage, control generator regulator shutdown；The CPLD processing electricity
Road also inputs the output signal of excitation negative voltage regulator circuit, and judges whether to export according to the output signal of excitation negative voltage regulator circuit
PWM enable signal is sent to DSP processing circuit.
The DSP processing circuit uses the high-speed dsp chip of TI company production, constructs minimum system peripheral circuit, mainly
Include clock circuit, reset circuit, JTAG interface circuit, power circuit, PWM drive control circuit, RS422 interface circuit.DSP
The input of processing circuit is the virtual value and PWM enable signal of three-phase low-voltage alternating voltage；DSP processing circuit is according to setting
Control method exports the pwm signal with corresponding driving capability, provides control signal for late-class circuit IGBT on-off.
The input of the IGBT drive circuit is the pwm signal of DSP processing circuit output, and IGBT drive circuit is through overmatching
Electric signal input is provided for IGBT grid, source electrode, drain electrode.
The energy absorption loop of power circuit is made of rectification module, IGBT and power absorption resistance；Rectification module is by main hair
Motor three-phase voltage AC signal is transformed to direct current；The pwm signal of DSP processing circuit output is opened or is closed by controlling IGBT
Investment or excision disconnected and then that power absorption resistance can be controlled.In the presence of transient overvoltage, power absorption resistance investment is fast
Speed consumption transient overvoltage, up to voltage output to normal range (NR).
In DSP processing circuit, overvoltage value is segmented, different overvoltage values corresponds to different duty ratios
Pwm control signal.DSP processing circuit samples the virtual value of the three-phase low-voltage alternating voltage of input and judged whether electricity
Pressure；If overvoltage, the PWM enable signal exported after segmentation limit locating for foundation overvoltage value and CPLD logical process,
The pwm control signal for exporting variable duty cycle keeps the transient power for controlling power absorption resistance investment directly proportional to overvoltage value, mistake
Voltage is higher, and the transient power of power absorption resistance investment is bigger, and vice versa, and the dynamic control for absorbing power is realized with this.
For the fast and effective inhibition for realizing aviation variable-frequency alternating current power generation system transient overvoltage, in embodiment as shown in Figure 1
System function framework carries out transient overvoltage and inhibits device design.Apparatus of the present invention and generator voltage controller cooperate, and lead to
It crosses after quick RMS to DC technology detects that generator transient voltage reaches default overvoltage value, gives generator voltage controller
Pressure regulation disable signal is sent, generator voltage controller cutting generator pilot exciter exciting current is made to rapidly deplete secondary excitation wire
Energy is enclosed, the electric energy in generator only carries out energy converting between mechanical by the dump energy in main magnet exciting coil.Meanwhile according to setting
Control algolithm and strategy, the higher DSP of overvoltage export more high duty ratio PWM, the lower DSP output of overvoltage is compared with low duty ratio
PWM controls the making time of power absorption resistance in energy absorption circuit with this, consumes master using dynamic power absorption pattern
Send out excitation portion of energy.
Simulation model is built with ANSYS Simplorer software, simulation model and part of test results are respectively such as Fig. 2,3 institutes
Show.Motor unloads when 100ms, and break pilot exciter exciting current after 0.5ms, and main power generation pivot three-phase voltage moment is raised to from 120V
158.16V.Because main hair armature supply suddenly becomes 0 at this time, and main hair exciting current is unable to transition, still maintains constant excitation electricity
Stream, investment transient overvoltage inhibits device after 2ms, from simulation result: main power generation pivot three-phase voltage is from transient high voltages 139V
It drops to 112V and takes around 2ms (1.84ms).Illustrate that transient overvoltage of the present invention inhibits device by absorbing to electromechanical energy, can have
Effect inhibit power grid in transient overvoltage, prevent power-supply system caused by over-voltage protect, realize network voltage by transient high voltages to
The quick and smooth transition of steady state voltage improves the safety and robustness of power grid.
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 (1)
1. a kind of three phase variable frequency alternating current power-generating system over-voltage suppression device, it is characterised in that: sampled including generator three-phase voltage
Circuit, virtual value counting circuit, comparison circuit, excitation negative voltage regulator circuit, CPLD processing circuit, DSP processing circuit, IGBT driving
Circuit and energy absorption loop of power circuit；
The input of the generator three-phase voltage sample circuit be main generator three-phase voltage AC signal, and to input signal into
Row electric resistance partial pressure and capacitor frequency compensation export as three-phase low-voltage AC signal；
The input of the virtual value counting circuit is the three-phase low-voltage AC signal after partial pressure, and carries out virtual value to input signal
It calculates, exports as the virtual value of three-phase low-voltage alternating voltage；
The input of the comparison circuit is the three-phase low-voltage AC signal after partial pressure, and by the three-phase low-voltage AC signal after partial pressure
It is compared with the reference voltage of setting, exports comparison result；
The input of the excitation negative voltage regulator circuit is the voltage signal at controller excitation negative, and carries out at pressure stabilizing to input signal
Reason, output signal are sent to CPLD processing circuit；
The input of the CPLD processing circuit is the comparison result of comparison circuit output, and CPLD processing circuit is sentenced according to comparison result
It is disconnected whether to export the pressure regulation that pressure regulation disable signal controls generator regulator to controller, wherein when in generator three-phase voltage
When any one phase output over-voltage, control generator regulator shutdown；The CPLD processing circuit also inputs excitation negative pressure stabilizing electricity
The output signal on road, and judge whether that exporting PWM enable signal send to DSP processing according to the output signal of excitation negative voltage regulator circuit
Circuit；
The input of the DSP processing circuit is the virtual value and PWM enable signal of three-phase low-voltage alternating voltage；DSP processing electricity
Road samples the virtual value of the three-phase low-voltage alternating voltage of input and judges whether overvoltage；If overvoltage, basis
The PWM enable signal exported after overvoltage value and CPLD logical process, exports the pwm control signal of variable duty cycle, makes to control function
The transient power of rate absorption resistance investment is directly proportional to overvoltage value；
The input of the IGBT drive circuit is the pwm control signal of DSP processing circuit output, and IGBT drive circuit is through overmatching
Electric signal input is provided for IGBT grid, source electrode, drain electrode；
The energy absorption loop of power circuit is made of rectification module, IGBT and power absorption resistance；Rectification module is by main generator
Three-phase voltage AC signal is transformed to direct current；The pwm control signal of DSP processing circuit output is opened or is closed by controlling IGBT
Investment or excision disconnected and then that power absorption resistance can be controlled.
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| CN109193604A (en) * | 2018-10-24 | 2019-01-11 | 陕西航空电气有限责任公司 | Aircraft AC electrical electricity generation system transient overvoltage protector |
| CN109256993A (en) * | 2018-11-20 | 2019-01-22 | 东莞市德克韦尔能源技术有限公司 | A kind of underground digital power system |
| CN109194214B (en) * | 2018-11-20 | 2021-10-22 | 陕西航空电气有限责任公司 | Transient overvoltage suppression circuit of three-stage synchronous generator and implementation method thereof |
| CN110620369B (en) * | 2019-08-18 | 2021-09-17 | 陕西航空电气有限责任公司 | Overvoltage fault diagnosis and isolation method for aviation power generation system |
| CN110798108B (en) * | 2019-11-07 | 2021-07-06 | 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 |
| CN111142021B (en) * | 2019-12-31 | 2022-01-04 | 南京航空航天大学 | Asynchronous sampling method for three-stage brushless synchronous variable frequency alternating current power generation system |
| CN112398107B (en) * | 2020-11-13 | 2023-06-09 | 陕西航空电气有限责任公司 | Voltage sampling circuit in overvoltage suppression device of three-phase variable-frequency alternating-current power generation system |
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| CN202435016U (en) * | 2011-12-22 | 2012-09-12 | 华锐风电科技(集团)股份有限公司 | Quick protection circuit device for double-fed wind power generation system |
| CN105140959A (en) * | 2015-08-31 | 2015-12-09 | 国家电网公司 | Adjustable-resistance crowbar circuit and regulation and control method therefor |
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