CN109830959A - A kind of improvement control method of the high frequency compound filter based on silicon carbide - Google Patents
A kind of improvement control method of the high frequency compound filter based on silicon carbide Download PDFInfo
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Abstract
The improvement control method of the invention discloses a kind of high frequency compound filter based on silicon carbide, it is related to high-frequency harmonic shunt compensation technical field, by the way that the high frequency compound filter based on silicon carbide is connected between power grid and active filter, the rated capacity of active filter can be reduced by the partial pressure effect of the capacitor of high frequency compound filter, since phase offset occurs for the compensation electric current that the introducing of capacitor will lead to filter generation, by means of the present invention, specific harmonic component is extracted to current signal, and first differential is carried out to harmonic component, ratio, compensation, pass through dq rotating coordinate system inverse transformation again, by the harmonic current of hystersis controller control output and harmonic source with same frequency and reversed-phase.
Description
Technical field
The invention belongs to high-frequency harmonic shunt compensation technical fields more particularly to a kind of high frequency based on silicon carbide to mix filter
The improvement control method of wave device.
Background technique
With the rapid emergence of generation of electricity by new energy, acute variation is occurring for electric system, due to being widely applied in power grid
It is all based on PWM control technology in the power electronic equipment of generation of electricity by new energy, the extensive use of PWM control will lead to mains by harmonics and be in
Reveal the reduction of low-order harmonic content, the wideband characteristic of field that medium-high frequency harmonic content dramatically increases.High-frequency harmonic content it is continuous on
Grid power quality can not only be polluted by rising, and reduce the utilization rate of electric energy, can also reduce electric network reliability, interfere the electricity consumption on power grid
Equipment causes the malfunction of relay protection circuit, has seriously affected the normal operation of power grid.
Current existing harmonic compensation device is broadly divided into passive filter, active filter and three kinds of compound filter
Type.Wherein passive filter is at low cost, and structure is simple, but its filter effect is limited, and resonance easily occurs with power grid；Have
The real-time tracking compensation to harmonic component may be implemented in source filter, has preferable harmonic compensation performance, and dynamic characteristic is good, mends
Repay effect is not influenced by system parameter, but its performance is limited by the voltage class of electronic power switch device and system, it is difficult to be answered
Used in the harmonic compensation occasion of high frequency, large capacity；Compound filter is that passive filter is used in combination with active filter,
The feature that passive filter structure is simple, Yi Shixian and feature at low cost and active filter compensation performance are good is incorporated in one
It rises.
For above-mentioned application scenarios, a kind of high frequency compound filter based on silicon carbide can preferably be alleviated due to PWM
High-frequency harmonic deterioration problem caused by technology is universal.This compound filter by capacitor be connected on power grid and active filter it
Between, the rated capacity of active filter can be reduced by the partial pressure effect of capacitor, since the introducing of capacitor will lead to filter
Phase offset occurs for the compensation electric current of generation, so that introducing second order filter in control loop alleviates the phase due to caused by capacitor
Position offset problem, the filter construction can be applied to the serious high voltage network of harmonic pollution.But this control program can be to being
The stable operation of system affects, due to introducing second order filter, the Phase margin meeting of system in the controls
There is a degree of reduction, simultaneously because control system does not compensate the phase delay of controlled device, therefore with harmonic compensation
The increase of number, system Phase margin can be reduced rapidly and finally lose stabilization so as to cause compound filter.
Summary of the invention
The improvement control method of the purpose of the present invention is to provide a kind of high frequency compound filter based on silicon carbide, thus
It overcomes since the reduction of the system Phase margin of compound filter leads to compound filter unstability when compensating higher hamonic wave
Disadvantage.
To achieve the above object, the present invention provides the improvement control method of the high frequency compound filter based on silicon carbide,
The following steps are included:
S1, the high frequency compound filter based on silicon carbide is connected between power grid and active filter；
S2, the high frequency compound filter based on silicon carbide use the Harmonic Detecting Algorithm converted based on dq to extract harmonic wave point
Amount；
S3, first differential is carried out to the harmonic component, it is super by that can be generated to harmonic component progress first differential
The phase delay of preceding phase angle compensation control system, alleviate the high frequency compound filter based on silicon carbide when compensating high-frequency harmonic by
The problem of leading to filter unstability is reduced rapidly in Phase margin；Harmonic component after first differential is passed through into second-order low-pass filter
Device is filtered, and can correct the phase as caused by the high frequency compound filter based on silicon carbide by second-order low-pass filter
Offset, makes it show impedance operator near specified frequency, avoids because the introducing of capacitor influences active filter
Compensation performance；
S4, make the harmonic component by proportional component, proportional component can accelerate the response speed of control loop, improve
The dynamic characteristic of high frequency compound filter based on silicon carbide；
S5, S3 is added with the harmonic component of the obtained corresponding axial direction of S4, so that the high frequency for obtaining silicon carbide is mixed
Close the designated value of filter output compensation electric current；
S6, the thermal compensation signal that S5 is obtained is adjusted to designated value by the way of adding outer voltage, using addition
The mode of outer voltage guarantees the constant of the DC voltage of the high frequency compound filter based on silicon carbide；
S7, it after the harmonic component that S6 is obtained is shifted to three phase static coordinate by dq rotating coordinate system contravariant, obtains based on carbon
The high frequency compound filter of SiClx exports compensation current, and compensation current is exported with the high frequency compound filter based on silicon carbide
The actual value of compensation electric current subtracts each other to obtain error, as the input of Hysteresis control, is sent into hystersis controller, hystersis controller according to
Gate leve needed for generating controls signal, controls signal by gate leve and controls high frequency compound filter and harmonic source based on silicon carbide
The harmonic current of with same frequency and reversed-phase.
Further, the S2 specifically includes the following steps:
The electricity that S21, the high frequency compound filter based on silicon carbide are generated by the collected harmonic source of Current Transmit
Net electric current, i.e. load current, load current are alternating current, and load current includes fundamental current component and harmonic current components；
S22, high frequency compound filter based on silicon carbide control system power network current is subjected to-two phase transformation of three-phase first
Get biphase current in return；Then biphase current is converted by dq rotating coordinate system, obtains the fundamental wave point in dq rotating coordinate system
The harmonic component with the fundametal compoment in dq rotating coordinate system is measured, the fundametal compoment under dq rotating coordinate system is direct current, dq rotation
The harmonic component of fundametal compoment in coordinate system is exchange；The direct current in dq rotating coordinate system is filtered out finally by high-pass filter
Harmonic component is obtained after amount.
Further, the transmission function of the first derivative element is as follows:
Gd(s)=sTd+Cd (1)
In formula (1), Td、CdTo adjust the dynamic characteristic of differentiation element, TdFor the time constant of differentiation element,s
It is corresponding with the t in real number field, it is specifically defined as differential operator.
Further, the transmission function of the proportional component is as follows:
Gp(s)=k (2)
In formula (2), k is the multiple of carry out ratio.
Further, the S6 is specifically included: the error signal of DC voltage designated value and actual value is adjusted through PI
Regulated voltage signal is obtained after device, is added in reactive current component (both harmonic components of q axis) as referenced reactive current value,
Allow in this way Active Power Filter-APF its DC side with exchange side positive energy exchange, by DC bus capacitor electricity
Pressure is adjusted to designated value, realizes the control to the DC voltage of the high frequency compound filter based on silicon carbide.
Further, the high frequency compound filter based on silicon carbide includes: active filter and harmonic source；
The harmonic source, it is online to be parallel to three-phase alternating current, generates harmonic wave for simulating nonlinear load；
The active filter is parallel between the harmonic source and three-phase AC grid, can be with institute for generating
State the harmonic compensation current that the harmonic current components in the load current of harmonic source generation are cancelled out each other；
Be equipped with capacitor in the active filter, the capacitance series the active filter and three-phase AC grid it
Between, for reducing the voltage rating of the active filter outlet side, while show the active filter to fundamental current
High impedance out, the switching tube of active filter are silicon carbide switches pipe.
Further, the active filter includes Shunt Hybrid Active Power Filter and control loop；
The capacitor is arranged in the Shunt Hybrid Active Power Filter, sets in the Shunt Hybrid Active Power Filter
There is switching tube；The active filter is used to control Shunt Hybrid Active Power Filter output harmonic wave by the control loop and mend
Electric current is repaid, the harmonic current components in load current that harmonic compensation current can be generated with the harmonic source, which are cancelled out each other, to be reached
The purpose of harmonic compensation；
The control loop, the load current for generating the collected harmonic source are transformed to based on dq coordinate system
Signal, then the harmonic current of specific frequency in load current is sampled, by the electric current after sampling by first differential,
The harmonic compensation current reference value of active filter is obtained after second order filter and proportional component；Harmonic compensation current is referred to again
Value, which shifts to three-phase static coordinate system by dq rotating coordinate system contravariant, can extract grid current harmonic component；Finally by general
DC voltage compensation component and the harmonic compensation component based on d/q rotating coordinate system that control loop generates be superimposed make it is active
It include DC voltage control signal in the harmonic current compensation signal of filter, hystersis controller is according to grid current harmonic point
Amount, control Shunt Hybrid Active Power Filter generate corresponding harmonic compensation current.
Further, the control loop includes:
Harmonic wave sampling apparatus, input terminal are connect with the output end of the harmonic source, to by the collected harmonic wave
The load current that source generates transforms to the signal based on dq rotating coordinate system, extracts the harmonic wave of specific frequency in the load current
Current component, for as reference；Then the harmonic current components are passed through into first differential, second order filter and proportional component
The harmonic compensation current reference value of active filter is obtained afterwards；It is again that harmonic compensation current reference value is anti-by dq rotating coordinate system
Grid current harmonic component can be extracted by being converted into three phase coordinate systems, so that controlling active filter generates a constant amplitude with frequency
The compensation electric current of reverse phase, i.e. harmonic compensation component；
DC voltage control module is connected in parallel in dq rotating coordinate system module, for generating the control of DC voltage
Signal processed, and in the signal that the control Signal averaging of the DC voltage is exported to harmonic wave sampling apparatus；
The dq rotating coordinate system module, for carrying out the transformation of d/q rotating coordinate system to signal；And
The hystersis controller, input terminal are connect with the output end of the dq rotating coordinate system module, output end connection
To at the switching tube of Shunt Hybrid Active Power Filter, for generating gate leve letter according to the signal based on three phase coordinate systems
Number, and the Shunt Hybrid Active Power Filter is controlled by the gate leve signal and generates harmonic compensation current.
Compared with prior art, the invention has the following beneficial effects: the height provided by the present invention based on silicon carbide
The improvement control method of frequency compound filter, by the way that the high frequency compound filter based on silicon carbide is connected on power grid and active filter
Between wave device, the rated capacity of active filter can be reduced by the partial pressure effect of the capacitor of high frequency compound filter, due to
Phase offset occurs for the compensation electric current that the introducing of capacitor will lead to filter generation, by means of the present invention, to current signal
Specific harmonic component is extracted, and first differential, ratio, compensation are carried out to harmonic component, then pass through the contravariant of dq rotating coordinate system
It changes, by the harmonic current of hystersis controller control output and harmonic source with same frequency and reversed-phase.
By introducing first differential, the leading phase angle compensation control system that first differential can generate is carried out to harmonic component
Phase delay, alleviate the high frequency compound filter based on silicon carbide when compensating high-frequency harmonic since Phase margin is reduced rapidly
The problem of leading to filter unstability.By introducing proportional component, can correct due to the high frequency compound filter based on silicon carbide
Caused phase offset makes it show impedance operator near specified frequency, avoids because the introducing of capacitor influences
The compensation performance of active filter.To increase the Phase margin of system, while the response speed of system is improved, preferably
It alleviates since the reduction of the system Phase margin of the high frequency compound filter based on silicon carbide causes compound filter compensating
When higher hamonic wave the phenomenon that unstability.
Detailed description of the invention
It, below will be to attached drawing needed in embodiment description in order to illustrate more clearly of technical solution of the present invention
It is briefly described, it should be apparent that, the accompanying drawings in the following description is only one embodiment of the present of invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is the schematic illustration of the improvement control method of the high frequency compound filter the present invention is based on silicon carbide；
Fig. 2 is that the unused high frequency compound filter based on silicon carbide of the present invention emulates obtained power network current waveform before
Figure；
Fig. 3 is that the unused high frequency compound filter based on silicon carbide of the present invention emulates obtained power network current waveform before
Fast Fourier analysis result schematic diagram；
Fig. 4 is the power network current waveform diagram that the present invention is emulated using the high frequency compound filter based on silicon carbide；
Fig. 5 is the quick of the power network current waveform that the present invention uses the high frequency compound filter based on silicon carbide to emulate
Fourier analysis result schematic diagram；
Wherein: 1-LC series circuit, 2- active filter one, 3- harmonic current extraction module, 4- harmonic compensation current are raw
At module, 5-d/q rotating coordinate system, 6- DC voltage control module, 7- hystersis controller, 8- harmonic source, 9- is based on carbonization
The high frequency compound filter of silicon.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, the technical solution in the present invention is clearly and completely described,
Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention
Embodiment, those of ordinary skill in the art's every other embodiment obtained without creative labor,
It shall fall within the protection scope of the present invention.
As shown in Figure 1, the improvement control method of the high frequency compound filter provided by the present invention based on silicon carbide, including
Following steps:
S1, the high frequency compound filter 9 based on silicon carbide is connected between power grid and active filter；
S2, the high frequency compound filter 9 based on silicon carbide extract harmonic wave point using the Harmonic Detecting Algorithm converted based on dq
Amount；It is specific:
The electricity that S21, the high frequency compound filter 9 based on silicon carbide are generated by the collected harmonic source of Current Transmit
Net electric current, i.e. load current, load current (isa、isb、isc) it is alternating current, load current includes fundamental current component and harmonic wave
Current component；
S22, high frequency compound filter 9 based on silicon carbide control system power network current is subjected to three-phase-two-phase first
Transformation obtains biphase current；Then biphase current is converted by dq rotating coordinate system, obtains the fundamental wave in dq rotating coordinate system
The harmonic component of component and the fundametal compoment in dq rotating coordinate system, the fundametal compoment under dq rotating coordinate system are direct current, dq rotation
Turn the harmonic component of the fundametal compoment in coordinate system as exchange；It is filtered out in dq rotating coordinate system finally by high-pass filter HPF
DC quantity after obtain harmonic component, the harmonic component of d axis is isdh, the harmonic component of q axis is isqh；
S3, first differential is carried out to harmonic component, by carrying out the leading phase that first differential can generate to harmonic component
The phase delay of angle compensation control system, alleviate the high frequency compound filter 9 based on silicon carbide when compensating high-frequency harmonic due to
Phase margin is reduced rapidly the problem of leading to filter unstability；Harmonic component after first differential is passed through into second-order low-pass filter
It is filtered, can be corrected by second-order low-pass filter due to (the capacitor C of high frequency compound filter 9 based on silicon carbidedc) lead
The phase offset of cause makes it show impedance operator near specified frequency, avoids because the introducing of capacitor influences base
In the compensation performance of the high frequency compound filter 9 of silicon carbide；
The transmission function of first derivative element is as follows:
Gd(s)=sTd+Cd (1)
In formula (1), Td、CdTo adjust the dynamic characteristic of differentiation element, TdFor the time constant of differentiation element,s
It is corresponding with the t in real number field, it is specifically defined as differential operator；
S4, make harmonic component by proportional component, proportional component can accelerate the response speed of control loop, and improvement is based on
The dynamic characteristic of the high frequency compound filter 9 of silicon carbide；
The transmission function of proportional component is as follows:
Gp(s)=k (2)
In formula (2), k is the multiple of carry out ratio；
S5, S3 is added with the harmonic component of the obtained corresponding axial direction of S4, so that the high frequency for obtaining silicon carbide is mixed
Close the designated value of filter output compensation electric current；
S6, the thermal compensation signal that S5 is obtained is adjusted to designated value by the way of adding outer voltage, using addition
The mode of outer voltage guarantees the DC voltage u of the high frequency compound filter 9 based on silicon carbidedcIt is constant；
Specifically, by DC voltage designated value udcrefWith actual value udcError signal electricity is obtained after pi regulator
Adjustment signal is pressed, as referenced reactive current value Isqh' reactive current component that is added to (both harmonic component i of q axissqh) on, lead to
Cross such mode allow Active Power Filter-APF its DC side with exchange side positive energy exchange, by DC capacitor voltage
It is adjusted to designated value, realizes the control to the DC voltage of the high frequency compound filter 9 based on silicon carbide；
S7, it after the harmonic component that S6 is obtained is shifted to three phase static coordinate by dq rotating coordinate system contravariant, obtains based on carbon
The high frequency compound filter 9 of SiClx exports compensation current, and compensation current and the high frequency compound filter 9 based on silicon carbide are defeated
The actual value for compensating electric current out subtracts each other to obtain error, as the input of Hysteresis control, is sent into hystersis controller 7, hystersis controller 7
Gate leve needed for generating controls signal, by gate leve control signal high frequency compound filter 9 of the control based on silicon carbide with
The harmonic current of 8 with same frequency and reversed-phase of harmonic source.
High-frequency harmonic paralleling compensating device 9 based on silicon carbide includes: that the high frequency compound filter 9 based on silicon carbide is harmonious
Wave source 8；The input terminal of high frequency compound filter 9 based on silicon carbide is connected in parallel on three-phase AC grid；Capacitor C setting is being based on carbon
In the high frequency compound filter 9 of SiClx, capacitor C is serially connected in high frequency compound filter 9 and three-phase AC grid based on silicon carbide
Between, for reducing the voltage rating of 9 outlet side of high frequency compound filter based on silicon carbide, keep the high frequency based on silicon carbide mixed
It closes filter 9 and high impedance is shown to fundamental current；Harmonic source 8 is connected in parallel on the high frequency compound filter 9 and three based on silicon carbide
Between the connection of phase AC network, this characteristic of harmonic wave is generated for simulating nonlinear load.The i that harmonic source 8 exportssa、isb、isc
For load current, fundamental current component and the harmonic current components to be filtered out are included in load current.
It continues to refer to figure 1, the high frequency compound filter 9 based on silicon carbide includes Shunt Hybrid Active Power Filter and control
Circuit.Wherein, Shunt Hybrid Active Power Filter includes three groups and is connected to the online LC series circuit 1 of three-phase alternating current,
LC series circuit 1 is connected to active filter 1 again；LC series circuit 1 include be sequentially connected in series it is online in three-phase alternating current
Capacitor C and inductance L, capacitor C therein for reducing 9 outlet side of high frequency compound filter based on silicon carbide voltage rating,
Inductance L is used to filter out the switch harmonic of the high frequency compound filter 9 based on silicon carbide itself；Active filter 1 includes capacitor
CdcIt is connected in parallel on the switching tube group at capacitor both ends respectively with three groups, each switching group includes two concatenated switching tubes, switching tube
G1~g6 is silicon carbide switches pipe, and silicon carbide switches pipe can be applied to high-frequency and high-voltage occasion.Institute is controlled by control loop
There is switching tube, the i exported using LC series circuit 1Afa、iAfb、iAfcFor harmonic compensation current, harmonic compensation current can be with
The harmonic component in load current that harmonic source 8 generates is cancelled out each other, and achievees the purpose that harmonic compensation.
Capacitor C=15 the μ F, inductance L=0.001H that the present embodiment uses.
With further reference to Fig. 1, the input terminal of control loop connect with the output end of harmonic source 8 (loading), output end and
Switching tube connection, the load current for generating the harmonic source sampled 8 transforms to the signal based on dq coordinate system, then right
The harmonic current of specific frequency is sampled and (is filtered by high-pass filter) in load current, and the electric current after sampling is led to
The harmonic compensation electricity of the high frequency compound filter 9 based on silicon carbide is obtained after crossing first differential, second order filter and proportional component
Flow reference value；Harmonic compensation current reference value, which is shifted to three-phase coordinate system by dq rotating coordinate system contravariant, again can extract electricity
Net current harmonics component；Finally by the DC voltage compensation component for generating control loop and based on d/q rotating coordinate system
The superimposed harmonic current compensation signal for making the high frequency compound filter 9 based on silicon carbide of harmonic compensation component in include direct current
Side voltage control signal, hystersis controller 7 control Shunt Hybrid Active Power Filter and generate phase according to grid current harmonic component
The harmonic compensation current answered.
Control loop includes: harmonic wave sampling apparatus, d/q rotating coordinate system 5, harmonic compensation current generation module 4, DC side
Voltage control module 6 and hystersis controller 7.
The input terminal of harmonic wave sampling apparatus is adopted with the output end connection of harmonic source 8 (loading) by Current Transmit
Collected load current progress-two phase inversion of three-phase is obtained biphase current by the load current that the harmonic source 8 collected generates；
Secondly biphase current is converted by dq rotating coordinate system, obtains the fundametal compoment and dq rotating coordinate system in dq rotating coordinate system
In fundametal compoment harmonic component, the fundametal compoment under dq rotating coordinate system is direct current, the harmonic wave point in dq rotating coordinate system
Amount is exchange；Then harmonic component, d axis are obtained after filtering out the DC component in dq rotating coordinate system by high-pass filter HPF
Harmonic component be isdh, the harmonic component of q axis is isqh；Finally, being obtained by first differential, second order filter and proportional component
Harmonic compensation current reference value；
DC voltage control module 6 is connected in parallel on d/q rotating coordinate system 5, and DC voltage control module 6 is for generating
The control signal of DC voltage, and in the signal that the control Signal averaging of DC voltage is exported to harmonic wave sampling apparatus；
D/q rotating coordinate system 5 is connect with harmonic wave sampling apparatus, for carrying out the transformation of d/q rotating coordinate system to signal；
The input terminal of hystersis controller 7 is connect with the output end of dq rotating coordinate system module 5, and output end is connected to based on carbon
At the switching tube of the high frequency compound filter 9 of SiClx, hystersis controller 7 is used to generate door according to the signal based on three phase coordinate systems
Grade signal, and controlled by gate leve signal switch tube 9 to make the mixing in parallel of the high frequency compound filter 9 based on silicon carbide
Type active filter generates the harmonic compensation current of a constant amplitude with same frequency and reversed-phase.
Fig. 1 is further referred to, harmonic wave sampling apparatus includes that harmonic current extraction module 3 and harmonic compensation current generate mould
The input terminal of block 4, harmonic current extraction module 3 is connect with the output end of harmonic source 8 (loading)；Harmonic compensation current generates mould
The input terminal of block 4 is connect with the output end of harmonic current extraction module 3.Harmonic current extraction module 3 is used for humorous to what is sampled
The load current that wave source 8 generates carries out-two phase inversion of three-phase and obtains biphase current；Then biphase current is passed through into dq rotational coordinates
System's transformation, obtains the harmonic component in the fundametal compoment and dq rotating coordinate system in dq rotating coordinate system；It is filtered finally by high pass
Wave device HPF obtains harmonic component after filtering out the DC quantity in dq rotating coordinate system, and the harmonic component of d axis is isdh, the harmonic wave of q axis
Component is isqh；The Matrix C of-two phase inversion of three-phase in harmonic current extraction module 33/2Are as follows:
Dq rotating coordinate system becomes Matrix CdqAre as follows:
In formula (3), θ is the phase angle of a phase fundamental current.
It is micro- that the harmonic component that harmonic compensation current generation module 4 is used to extract harmonic current extraction module 3 carries out single order
Divide, second order filter and proportional component obtain harmonic compensation current reference value, the second order filter in harmonic compensation current generation module 4
The effect of wave device here is correcting current phase, the transmission function G of second order filter are as follows:
In formula (4), wherein choose suitable ωnIt is used to configure the pole of second order filter with ξ, adjusts second order filter
Dynamic characteristic；
The signal transformation matrix C of d/q rotating coordinate system 52S/2RAre as follows:
DC voltage control module 6 uses PI controller, inputs the error amount for reference voltage and virtual voltage, exports
For required control signal, the transmission function of PI controller are as follows:
In formula (5), kpFor scale parameter, kiFor integral parameter, value is not fixed, and needs to be adjusted according to concrete application scene.
Hystersis controller 7 is by compensation current and the output compensation electric current of high frequency compound filter 9 based on silicon carbide
Actual value subtracts each other to obtain error, as the input of Hysteresis control, is sent into hystersis controller 7, hystersis controller 7 is according to needed for generation
Gate leve control signal, it is anti-with frequency to control signal high frequency compound filter 9 of the control based on silicon carbide and harmonic source 8 by gate leve
The harmonic current of phase.
Embodiment:
Simultaneously using the improvement control method of the high frequency compound filter based on silicon carbide and the high-frequency harmonic based on silicon carbide
Join compensation device, the simulation parameter of table 1 is emulated, loads 21-27 subharmonic of injection into power grid.
Table 1
| KR | ω1(rad/s) | ωn(rad/s) | ξ | p1 | Td | Cd | k |
| 10 | 100π | 80ω1 | 0.707 | 1 | 1 | 1000 | 0.5 |
The power network current waveform diagram such as Fig. 2 emulated before the high frequency compound filter 9 based on silicon carbide is not used
It is shown, by fast Fourier analysis Fig. 2 as a result, percent harmonic distortion at this time is 11.51% (as shown in Figure 3)；Using being based on
The high frequency compound filter 9 of silicon carbide emulates obtained power network current waveform diagram as shown in figure 4, by fast Fourier analysis figure
4 as a result, percent harmonic distortion at this time is 2.55% (as shown in Figure 5).As it can be seen that the high frequency provided by the present invention based on silicon carbide
The improvement control method of compound filter increases by introducing first derivative element and proportional component in control loop and is
The Phase margin of system, while the response speed of system is improved, it preferably alleviates since the reduction of system Phase margin causes
Compound filter is when compensating higher hamonic wave the phenomenon that unstability.
Above disclosed is only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, can readily occur in variation or modification,
It is covered by the protection scope of the present invention.
Claims (8)
1. a kind of improvement control method of the high frequency compound filter based on silicon carbide, it is characterised in that: the following steps are included:
S1, the high frequency compound filter based on silicon carbide is connected between power grid and active filter；
S2, the high frequency compound filter based on silicon carbide use the Harmonic Detecting Algorithm converted based on dq to extract harmonic component；
S3, first differential is carried out to the harmonic component；By the harmonic component after first differential by second-order low-pass filter into
Row filtering；
S4, make the harmonic component by proportional component, proportional component can accelerate the response speed of control loop, and improvement is based on
The dynamic characteristic of the high frequency compound filter of silicon carbide；
S5, S3 is added with the harmonic component of the obtained corresponding axial direction of S4, to obtain the high frequency mixing filter of silicon carbide
The designated value of wave device output compensation electric current；
S6, the thermal compensation signal that S5 is obtained is adjusted to designated value by the way of adding outer voltage；
S7, it after the harmonic component that S6 is obtained is shifted to three phase static coordinate by dq rotating coordinate system contravariant, obtains based on silicon carbide
High frequency compound filter export compensation current, compensation current with based on silicon carbide high frequency compound filter export compensate
The actual value of electric current subtracts each other to obtain error, as the input of Hysteresis control, is sent into hystersis controller, hystersis controller is according to generation
Required gate leve controls signal, controls high frequency compound filter and harmonic source of the signal control based on silicon carbide with frequency by gate leve
The harmonic current of reverse phase.
2. the improvement control method of the high frequency compound filter according to claim 1 based on silicon carbide, it is characterised in that:
The S2 specifically includes the following steps:
The power grid electricity that S21, the high frequency compound filter based on silicon carbide are generated by the collected harmonic source of Current Transmit
Stream, i.e. load current；
S22, high frequency compound filter based on silicon carbide control system power network current progress-two phase inversion of three-phase is obtained first
To biphase current；Then biphase current is converted by dq rotating coordinate system, obtain fundametal compoment in dq rotating coordinate system and
The harmonic component of fundametal compoment in dq rotating coordinate system；The direct current in dq rotating coordinate system is filtered out finally by high-pass filter
Harmonic component is obtained after amount.
3. the improvement control method of the high frequency compound filter according to claim 1 based on silicon carbide, it is characterised in that:
The transmission function of the first derivative element is as follows:
Gd(s)=sTd+Cd (1)
In formula (1), Td、CdTo adjust the dynamic characteristic of differentiation element, TdFor the time constant of differentiation element,S and reality
T in number field is corresponding, is specifically defined as differential operator.
4. the improvement control method of the high frequency compound filter according to claim 1 based on silicon carbide, it is characterised in that:
The transmission function of the proportional component is as follows:
Gp(s)=k (2)
In formula (2), k is the multiple of carry out ratio.
5. the improvement control method of the high frequency compound filter according to claim 1 based on silicon carbide, it is characterised in that:
The S6 is specifically included: the error signal of DC voltage designated value and actual value being obtained to voltage after pi regulator and adjusts letter
Number, it is added in reactive current component as referenced reactive current value.
6. the improvement control method of the high frequency compound filter according to claim 1 based on silicon carbide, it is characterised in that:
The high frequency compound filter based on silicon carbide includes: active filter and harmonic source；
The harmonic source, it is online to be parallel to three-phase alternating current, generates harmonic wave for simulating nonlinear load；
The active filter is parallel between the harmonic source and three-phase AC grid, for generate can with it is described humorous
The harmonic compensation current that the harmonic current components in load current that wave source generates are cancelled out each other；
Capacitor is equipped in the active filter, the capacitance series between the active filter and three-phase AC grid,
For reducing the voltage rating of the active filter outlet side, while the active filter being made to show height to fundamental current
Impedance, the switching tube of active filter are silicon carbide switches pipe.
7. the improvement control method of the high frequency compound filter according to claim 6 based on silicon carbide, it is characterised in that:
The active filter includes Shunt Hybrid Active Power Filter and control loop；
The capacitor is arranged in the Shunt Hybrid Active Power Filter, is equipped with and opens in the Shunt Hybrid Active Power Filter
Guan Guan；The active filter is used to control Shunt Hybrid Active Power Filter output harmonic wave compensation electricity by the control loop
Stream, the harmonic current components in load current that harmonic compensation current can be generated with the harmonic source, which are cancelled out each other, reaches harmonic wave
The purpose of compensation；
The control loop, the load current for generating the collected harmonic source transform to the letter based on dq coordinate system
Number, then the harmonic current of specific frequency in load current is sampled, the electric current after sampling is passed through into first differential, second order
The harmonic compensation current reference value of active filter is obtained after filter and proportional component；Harmonic compensation current reference value is led to again
Grid current harmonic component can be extracted by crossing dq rotating coordinate system contravariant and shifting to three-phase static coordinate system；Finally by will control
The DC voltage compensation component that circuit generates with the harmonic compensation component based on d/q rotating coordinate system is superimposed makes active power filtering
Include DC voltage control signal in the harmonic current compensation signal of device, hystersis controller according to grid current harmonic component,
It controls Shunt Hybrid Active Power Filter and generates corresponding harmonic compensation current.
8. the improvement control method of the high frequency compound filter according to claim 7 based on silicon carbide, it is characterised in that:
The control loop includes:
Harmonic wave sampling apparatus, input terminal are connect with the output end of the harmonic source, to produce the collected harmonic source
Raw load current transforms to the signal based on dq rotating coordinate system, extracts the harmonic current of specific frequency in the load current
Component, for as reference；Then by the harmonic current components by being obtained after first differential, second order filter and proportional component
To the harmonic compensation current reference value of active filter；Harmonic compensation current reference value is passed through into dq rotating coordinate system inverse transformation again
Grid current harmonic component can be extracted to three phase coordinate systems, so that controlling active filter generates a constant amplitude with same frequency and reversed-phase
Compensation electric current, i.e. harmonic compensation component；
DC voltage control module is connected in parallel in dq rotating coordinate system module, and the control for generating DC voltage is believed
Number, and in the signal that the control Signal averaging of the DC voltage is exported to harmonic wave sampling apparatus；
The dq rotating coordinate system module, for carrying out the transformation of d/q rotating coordinate system to signal；And
The hystersis controller, input terminal are connect with the output end of the dq rotating coordinate system module, and output end is connected to simultaneously
At the switching tube for joining hybrid active filter, for generating gate leve signal according to the signal based on three phase coordinate systems, and
The Shunt Hybrid Active Power Filter, which is controlled, by the gate leve signal generates harmonic compensation current.
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| CN101953228A (en) * | 2008-04-30 | 2011-01-19 | Lsi工业公司 | Power factor correction and driver circuits |
| CN103036236A (en) * | 2012-12-04 | 2013-04-10 | 湖南大学 | Control method of wide frequency range multi-type harmonic comprehensive governance system |
| CN104969466A (en) * | 2013-02-06 | 2015-10-07 | 三菱电机株式会社 | Filter device and electric rolling stock drive controller |
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