CN104065077B - Control method of series voltage compensation device - Google Patents
Control method of series voltage compensation device Download PDFInfo
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- CN104065077B CN104065077B CN201410241240.0A CN201410241240A CN104065077B CN 104065077 B CN104065077 B CN 104065077B CN 201410241240 A CN201410241240 A CN 201410241240A CN 104065077 B CN104065077 B CN 104065077B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a control method of a series voltage compensation device. The control method comprises the following steps: acquiring a reference rated voltage of a three-phase system, a load side three-phase voltage, and a filter inductive current at the AC side of an inverter unit through a data acquiring unit; calculating the difference between the three-phase voltage at the load side and the reference rated voltage of the three-phase system through a first error comparator, and treating the difference as the input of a proportion resonance regulator; calculating the difference between the output of the proportion resonance regulator set and the filter inductive current through a second error comparator, and treating the difference as the input of a proportion controller; accumulating the output of the proportion controller and the front feed of network voltage, and treating the product of the accumulated value and the DC voltage coefficient as IGBT (Insulated Gate Bipolar Translator) input of the inverter unit; accumulating the IGBT output of the inverter unit and the network voltage, and then controlling the load voltage. According to the control method of the series voltage compensation device, the design of combining the series compensation device and the DC voltage coefficient when a network suffers from a fault quickly and effectively ensures the stability of amplitude of the load port voltage.
Description
Technical field
The present invention relates to electric power neighborhood, more specifically, it is to be related to a kind of control method of series voltage compensation device.
Background technology
Series-type voltage compensation device, independent of electrical network and load, can be applicable to general energy-dissipating type load and energy feedback
Type loads, and when the low voltage crossing being applied to blower fan compensates, because it is independent of Wind turbines and access system, compensates performance and disobeys
The self-characteristic of bad blower fan, and gradually paid attention to by people.This device is series between load and electrical network, when system occurs voltage
When falling, it is ensured that load side voltage is stable, so that load is not fallen by system voltage affects device output offset voltage, when falling
After disappearance, can recover rapidly to send active energy and reactive energy to system.
The inverter control method of series-type voltage compensation device and the quality of control system, then be directly connected to its function
The quality realized and the safety and stability of device.For the control algolithm of inverter, adopt earliest controls for simulation pid, with
The popularization of digital processing unit, digital pid is gradually used, but the impact due to digital control middle sampling, computation delay, control
In a signal output delayed sampling period, lead to the stability of system poor, parameter testing simultaneously is complicated.Track with zero error is a kind of
Based on the control method of circuit model, the accuracy that it controls depends on the accuracy that system model is estimated, the therefore Shandong of system
Rod is poor.The dynamic property of repetitive controller is poor, and the dynamic responding speed of system is slow, needs the side such as bonding state feedback control
Method is improving its dynamic property.Additionally, also Sliding mode variable structure control, fuzzy control etc., but due to controlling the factors such as complexity, all
It is in the experimentation stage.
Being applied to the energy feedback types such as blower fan and loading another subject matter carrying out during voltage compensation is device itself
Integrity problem.Different from general dissipative load, when low-voltage occurs, its energy need to inject series compensation device to blower fan,
If it is not taken with certain control, the inherently safe of entail dangers to device.Grind currently for tandem type blower fan low voltage devices
Study carefully itself less, part document proposes this portion of energy feedback grid, but for rush of current larger in short-term, to control
Propose higher requirement, and device reliability is reduced.
Content of the invention
For defect present in prior art, it is an object of the invention to provide a kind of control of series voltage compensation device
Method, this control method has compensation precision height, fast response time, has the ability of harmonic compensation concurrently simultaneously；And calculate controlling
In method, fully ensure the safe and stable operation of device.Particularly, this control method employs based on ratio resonant regulator group
Double-loop control strategy；And for energy feedback type be supported on energy flowing backward device during fault problem it is also proposed that
A kind of method for designing of DC voltage control device is it is ensured that the safe and stable operation of series compensation device itself.Wherein, fundamental wave
The use of resonator ensure that precision and the steady-state behaviour of load port voltage, for the typical harmonic wave in electrical network and load, leads to
Cross addition harmonic resonator group, can effectively inhibit electrical network and load disturbance to the impact compensating performance.For DC side
The fluctuation of voltage, introduces DC voltage coefficient effectively to suppress this fluctuation.
For reaching above-mentioned purpose, the present invention adopts the following technical scheme that:
A kind of control method of series voltage compensation device, the concretely comprising the following steps of this control method:
A. reference rated voltage, load-side three-phase voltage and the inversion list of three-phase system is obtained by data acquisition unit
The filter inductance electric current of first AC；
B. pass through between the first error comparator computational load side three-phase voltage and the reference rated voltage of three-phase system
After difference, as the input of ratio resonant regulator group；
Wherein, ratio resonant regulator group is mainly made up of proportional component, fundamental-wave resonator and harmonic resonator group,
The mathematical model of described ratio resonant regulator group is as follows,
Wherein, kpFor proportional component gain, its span is between 1～10；kiFor the gain of resonator, value is 10
Between～100, its value is bigger, and precision is also higher, but the stability of system can decrease；
ωcutFor the shearing frequency of resonator, ωcutSpan is 5～20；
ω0Resonant frequency for system fundamental wave；
The waveform of the h time in h expression system, wherein, during h=1, corresponding for fundamental-wave resonator, this resonator is controlling
It is necessary in system, purpose is the following feature that increase system instructs to reference voltage, suppress in electrical network and load simultaneously
Disturbance in real time；H=3, when 5 ..., is harmonic resonator group, its number should be added according to the general characteristic of electrical network with number of times, mesh
Be suppress electrical network and load in harmonic voltage or harmonic current disturbance；
C. pass through the second error comparator and calculate the difference between the output of ratio resonant regulator group and filter inductance electric current
After value, as the input of proportional controller；
D. the output of proportional controller and voltage feed-forward control add up rear and DC voltage coefficient product as inversion
Igbt input in unit, the igbt output in inversion unit and line voltage cumulative after control load voltage；
Wherein, the introducing of voltage feed-forward control, is the response in order to increase system to voltage pulsation, the value of feed-forward coefficients
, between 0.5～2, value is bigger for scope, and control system is also faster to the response speed of voltage pulsation, but can reduce system
Stability；
And DC voltage control link is by introducing the design of DC voltage coefficient realizing in order to effectively
The impact to inverter for the suppression DC voltage fluctuation, improves the compensation precision compensating waveform.
By introducing DC voltage coefficient kdc, DC voltage is followed the tracks of with real-time monitoring and is sent to control system.Will
Its result with step c makees product calculation, to control the port voltage of load, so that inverter output voltage will not be by straight
The influence of fluctuations of stream side voltage.Wherein, kdcDesign as follows: by the DC voltage value under electrical network declared working condition, it is corresponding straight
Stream voltage coefficient kdcIt is taken as 1, when DC voltage raises a times, kdcIt is reduced to original 1/a；When DC voltage is reduced to
During original 1/a, kdcRise a height of original a times.kdcPurpose of design be: because DC voltage fluctuation can directly influence
The output waveform of igbt, therefore, by introducing DC voltage coefficient kdc, due to DC voltage and this DC voltage coefficient
Product be 1, and keep constant, therefore, from the point of view of whole control system, just imperceptible DC voltage is fluctuating, from
And it is effectively increased the robustness that control system fluctuates to DC voltage.
Described control method is further comprising the steps of:
When walking direction load characteristic according to load current is energy feedback type, straight by data acquisition unit real-time detection
Stream side voltage, and Hysteresis control is carried out to it by hystersis controller.
The concretely comprising the following steps of described hystersis controller Hysteresis control:
DC voltage value according to required for inverter offset voltage setting DC voltage reference value, on this basis
Set stagnant ring higher limit and stagnant ring lower limit；
When DC voltage exceedes the stagnant ring higher limit of its setting, DC side discharge loop switch closure, discharge resistance
Work, DC voltage starts to reduce；
When DC voltage is reduced to the stagnant ring lower limit of setting, DC side discharge loop switches off, now direct current
Voltage begins to ramp up.
Compared with prior art, following having is had using a kind of control method of series voltage compensation device of the present invention
Beneficial effect:
1) data acquisition unit detection line voltage, through phaselocked loop pll, obtains three-phase a, the amplitude of b, c system voltage
And phase information, phase information by with set-point phase calculate, obtain the reference rated voltage of three-phase system.Meanwhile, gather and bear
Carry side three-phase voltage, current information, using the input quantity as control module unit；
2) control unit to be realized designed control algolithm by digital processing chip, and control algolithm mainly includes a ratio
Example resonant regulator group, a DC side hystersis controller, wherein, ratio resonant regulator group is defined as: proportional controller+many
Individual resonant regulator group is constituted.Wherein, depending on the number of resonant regulator and number of times are according to the line voltage operating mode at device, example
As contained 3,5,7 subharmonic voltages or harmonic current in electrical network, then this resonator group is by fundamental-wave resonator and 3,5,7 harmonic wave
Resonator is constituted.As the outer ring controller of double-loop control strategy, it inputs is with reference to specified to this ratio resonant regulator group
The difference of voltage and load virtual voltage, the acting as of ratio resonant regulator group follows the tracks of given ginseng as far as possible so that exporting
Examine, to improve the compensation precision of system.Meanwhile, by adding harmonic resonator group, effectively to suppress in electrical network or load
Typical subharmonic disturbance.The output of resonator is as the instruction of interior ring controller, the difference of its current signal being gathered with internal ring
As the input of internal ring, output directly acts on inverter.Meanwhile, the addition of mains voltage feedforward, can effectively increase system
The response speed of system.The collective effect of this control strategy, control instruction is input in controlled device the most at last.
3rd, for the model of inversion unit, by document " Xu Dehong. power electronic system modeling and control [m]. Beijing: machine
Tool industry publishing house .2007:187-200. " understands, as the switching frequency f of inversion unitsIt is far longer than the fundamental wave of modulated signal
Frequency f0, and when occurring without ovennodulation, in fundamental signal in signal wave and low-order harmonic and inverter output voltage
There is fixed proportion relation in respective components, i.e. kpwm=udc/ut, wherein, udcFor DC voltage, utAmplitude for triangular wave.Real
On border, operationally, DC voltage is to fluctuate always to inversion unit, related to DC voltage by introducing in literary composition
Coefficient kdc, thus effectively inhibiting the impact that the disturbance of DC voltage exports to inverter.
4th, it is directed to the problem of the energy injection compensation device of energy feedback type load, DC side hystersis controller master is set
It act as controlling the voltage of DC side, the safe operation of protection device.Specific practice is: is examined in real time by data acquisition unit
Survey DC voltage, load current, and be sent in DC side hystersis controller.Walking direction according to load current is born
Carry whether property is energy feedback type.If so, then enter hystersis controller to be controlled.DC voltage is made to exceed its setting
Upper limit threshold when, DC side discharge loop switch closure, discharge resistance work, DC voltage start reduce；Work as DC side
When voltage is reduced to the lower threshold of setting, DC side discharge loop switches off, and now DC voltage begins to ramp up.So past
Multiple, by with the DC side upper limit, lower threshold compares, it is achieved thereby that the effective control of DC voltage.
In a word, the control method of the series voltage compensation device of the present invention, compensates dress for tandem type during electric network fault
Put it is proposed that a kind of control method adding feedforward controller based on the two close cycles of ratio resonant regulator group, in conjunction with DC voltage
The design of coefficient is such that it is able to fast and effectively the stablizing of the amplitude of proof load port voltage；Meanwhile, for energy feedback type
The excess energy of load injection series compensation device, using adding electrical switch to control discharge resistance hardware in a device, passes through
Detection load current steering wheel DC voltage amplitude size the break-make of electrical switch is controlled.This control system
In series connection low voltage crossing compensating apparatus, both maintained stablizing of load terminal voltage, in turn ensure that the steady peace of compensation device
Row for the national games.
Brief description
Fig. 1 is the application block diagram of the series voltage compensation device that embodiments of the invention are directed to；
Fig. 2 is the principle schematic of the control method of series voltage compensation device of the present invention；
Fig. 3 is the transmission function block diagram of the closed loop control in Fig. 2；
Fig. 4 is the flow chart of the Hysteresis control in Fig. 2；
Fig. 5 is the bode figure of the frequency characteristic of control method of the present embodiment, wherein,
Fig. 5 a is gvrefThe frequency characteristic of (s), i.e. the bode figure of the tracking characteristics to instruction for the closed loop output；
Fig. 5 b is gvsThe frequency characteristic of (s), i.e. the bode figure of the rejection characteristic to supply voltage disturbance for the closed loop output；
Fig. 5 c is gil(s), i.e. the bode figure of the rejection characteristic to load disturbance for the closed loop output；
Fig. 6 is the nyquist figure of open-loop transfer function when control system is unloaded；
Fig. 7 is that the control method of the present embodiment is applied to the compensation waveform of blower fan low-voltage problem.
Specific embodiment
Further illustrate technical scheme with reference to the accompanying drawings and examples.
Embodiment
Refer to shown in Fig. 1, wherein, in the case of line voltage is normal, load current is opened by the bypass of tandem arrangement
Pass flows in or out electrical network, and when low-voltage problem in electrical network, by-pass switch disconnects, and compensation device series connection accesses load and electricity
Between net.Control system designed by herein is mainly for the inversion unit of in figure and direct current discharge unit.Wherein, inversion unit
The offset voltage of main output inverter, direct current discharge unit is made up of electrical switch s and discharge resistance, during s closed loop, electric discharge electricity
Resistance forms loop with DC side, starts to discharge, and when s disconnects, resistance is disconnected with DC side, is not discharged.Wherein, isFor system
Electric current, ilFor load current, iinExport filter reactance electric current for inverter.
Fig. 2 show the control block diagram of whole control system.Wherein, by voltage transformer, current transformer, Hall etc.
Element, by the line voltage of three-phase system, the analog signalses such as load voltage, load current, and DC side voltage of converter
Send into signal gathering unit, after conditioned, filtering and ad sampling, obtain corresponding digital information.
This digital information is divided into two parts, is respectively fed to designed closed loop controller and hystersis controller.Wherein, close
The input of ring controller is the analog quantitys such as the voltage x current of system, the voltage x current of load, and DC voltage, and its output is straight
Pick the igbt in inverter, thus effectively controlling load port voltage to keep stable.The input of hystersis controller is straight
Stream side voltage, the direct current discharge unit in Fig. 1 is sent in its output, by controlling the break-make of dc switch s, thus effective control is straight
The magnitude of voltage of stream side.
Fig. 3 is the unfolding circuits of closed loop control part shown in Fig. 2, that is, proposed by the invention based on ratio resonant regulator
The double-loop control strategy of group.Wherein, reference voltage is the rated value by the three-phase system voltage obtained by phaselocked loop, should
The outer shroud of double closed-loop control system is load voltage ring, and controller is ratio resonant regulator；Internal ring is the inductance electricity of inverter
Stream ring, controller is proportional controller, and meanwhile, controlling unit has also combined voltage feed-forward control control, and unidirectional current is voltage-controlled
Link processed.
The purpose designing this controller includes: because control targe is load voltage, therefore for outer shroud control particularly
Important, therefore this place detailed design outer ring controller so as to after can effectively ensure that compensation voltage precision.The drawing of internal ring
Entering is response speed in order to increase system, increases stability margin, therefore only meets this control enough by additional proportion controller
System requires, and between the span generally 2～10 of this proportional controller, within this scope, it is bigger that this value takes, system
Response speed is faster, but unfavorable to the stability of system；Value is less, then effect is contrary.The introducing of voltage feed-forward control, be
In order to increase the response to voltage pulsation for the system, typically between 0.5～2, value is bigger for the span of feed-forward coefficients, controls
System is also faster to the response speed of voltage pulsation, but can reduce the stability of system.And DC voltage control link is logical
Cross the design introducing DC voltage coefficient realizing in order to effectively suppress the shadow to inverter for the DC voltage fluctuation
Ring, improve the compensation precision compensating waveform.
The mathematical model of designed ratio resonant regulator group is as follows, and this model is by proportional component+fundamental-wave resonator+humorous
Wave resonator group is constituted:
kpFor proportional component gain, its span is within 1～10；kiFor the gain of resonator, general value is tens
Extremely hundreds of, its value is bigger, and precision is also higher, but the stability of system can decrease；ωcutShearing for resonator
Frequency, ωcutTypically it is taken as the number between 5～20；ω0For the resonant frequency of system fundamental wave, the ripple of the h time in h expression system
Shape, in practical application, should add, for example, the exemplary voltages contained by electrical network or current harmonics according to the general characteristic of electrical network
For 3,5,7 times harmonics, then only need to increase the resonator of corresponding 3,5,7 grade number of times.
Wherein, during h=1, corresponding this resonator is necessary in the controls for fundamental-wave resonator, and purpose is to increase
The following feature that adding system instructs to reference voltage, suppresses the real-time disturbance in electrical network and load simultaneously；H=3, when 5 ..., be
Harmonic resonator group, its number and number of times should add according to the general characteristic of electrical network it is therefore intended that suppressing in electrical network and load
Harmonic voltage or harmonic current disturbance.
In the present invention, DC voltage is processed as disturbance quantity, by devising DC voltage coefficient kdc, real-time monitoring
Follow the tracks of DC voltage and be sent to control system.Concrete steps: by the DC voltage value under electrical network declared working condition, its correspondence
DC voltage coefficient kdcIt is taken as 1, when DC voltage raises a times, kdcIt is reduced to original 1/a；When DC voltage fall
During as little as original 1/a, kdcRise a height of original a times.kdcPurpose of design be: due to DC voltage fluctuates can direct shadow
Ring the output waveform to igbt, therefore, by introducing DC voltage coefficient kdc, due to DC voltage and this DC voltage
The product of coefficient is 1, and keeps constant, and therefore, from the point of view of whole control system, it controls output effect would not feel
The fluctuation of DC side, thus inverter output voltage will not be subject to the influence of fluctuations of DC voltage, increased the Shandong of control system
Rod.
Fig. 4 is the detailed description of Hysteresis control in Fig. 2, using flowchart representation, by data acquisition unit real-time detection
DC voltage, and be sent in DC side hystersis controller.Load current i defined in control systemlDirection: electric current
The direction flowing into load from electrical network is positive direction.Controller, according to the direction of load current, to judge that load characteristic is energy-dissipating type
(direction is just) or energy feedback type (direction is negative)；If load current direction is negative, enters hystersis controller and carry out directly
Stream voltage controls.DC voltage value according to required for inverter offset voltage is setting DC voltage benchmark udc0, Ran Hou
Stagnant ring higher limit u is set on this basisdc_upperWith lower limit udc_lower.As DC voltage udcExceed the upper limit of its setting
Threshold value udc_upperWhen, DC side discharge loop switch s closure, discharge resistance works, and DC voltage starts to reduce；Work as DC side
Voltage udcIt is reduced to the lower threshold u of settingdc_lowerWhen, DC side discharge loop switch s disconnects, and now DC voltage starts
Rise.During electric network fault, by actual DC voltage and the DC side upper limit, lower threshold recycle ratio relatively, it is achieved thereby that
The control of DC voltage is it is ensured that the stability of compensation device.
The frequency characteristic of the carried control system of the present invention as shown in figure 5, wherein, schemes a, b, c represent load voltage v respectivelyl
To reference voltage vref, load voltage vlTo source voltage vsAnd load voltage vlTo load current ilFrequency corresponding to transmission function
Rate characteristic.Can be seen that output voltage from frequency characteristic shown in figure a to can be very good to follow the tracks of given instruction (50hz), in fundamental wave
The steady-state error at place is less (stable state accuracy is 0.99), and that is, now the steady-state error of system is 1%, by increasing resonator gain
Ki, can reduce the steady-state error of system further.The precision controlling is higher；Can be seen that system from the frequency characteristic of figure b
Can be good at suppressing each harmonic (3,5,7) in line voltage；Can be seen that this controller from the frequency characteristic of figure c can
With each harmonic (3,5,7) in good suppression load current.Thus having reached design effect.
In literary composition, the stability of designed control system is determined by system open loop transmission function, Fig. 6 is system during zero load
Open loop Nyquist (nyquist) figure, as can be seen from the figure nyquist curve do not surround (- 1,0j) point, and system is no opened
The right limit of ring, thus prove that in literary composition, designed control system is stable.
Fig. 7 is the control method being carried using the present invention, for the compensation effect of tandem type blower fan low voltage ride through device,
Wherein, passage 1 is line voltage, and passage 2 is the blower fan port voltage after compensating, the offset voltage that passage 3 exports for inverter,
Passage 4 is the DC voltage of Hysteresis control.From compensation result as can be seen that this control strategy can effectively control blower fan
So as to not affected by grid voltage sags, meanwhile, hystersis controller can effectively restrain DC side electricity to port voltage
Pressure is it is ensured that the stable operation of compensation device.Control method and the effectiveness of control system that the results show is proposed.
Those of ordinary skill in the art is it should be appreciated that above embodiment is intended merely to illustrate the present invention's
Purpose, and it is not used as limitation of the invention, the change as long as in the essential scope of the present invention, to embodiment described above
Change, modification all will fall in the range of the claim of the present invention.
Claims (3)
1. a kind of control method of series voltage compensation device it is characterised in that:
The concretely comprising the following steps of this control method:
A. handed over by reference rated voltage, load-side three-phase voltage and inversion unit that data acquisition unit obtains three-phase system
The filter inductance electric current of stream side；
B. pass through the difference between the first error comparator computational load side three-phase voltage and the reference rated voltage of three-phase system
Afterwards, as the input of ratio resonant regulator group；
Wherein, ratio resonant regulator group is mainly made up of proportional component, fundamental-wave resonator and harmonic resonator group,
The mathematical model of described ratio resonant regulator group is as follows,
Wherein, kpFor proportional component gain, its span is between 1～10；kiFor the gain of resonator, value is 10～100
Between, its value is bigger, and precision is also higher, but the stability of system can decrease；
ωcutFor the shearing frequency of resonator, ωcutSpan is 5～20；
ω0Resonant frequency for system fundamental wave；
The waveform of the h time in h expression system, wherein, during h=1, corresponding for fundamental-wave resonator；H=3, when 5 ..., is harmonic wave
Resonator group, its number and number of times should add according to the general characteristic of electrical network it is therefore intended that suppressing humorous in electrical network and load
Wave voltage or the disturbance of harmonic current；
C. after the difference being calculated between the output of ratio resonant regulator group and filter inductance electric current by the second error comparator,
Input as proportional controller；
D. with DC voltage coefficient product as inverse after the output of proportional controller is added up with voltage feed-forward control coefficient
Become the igbt input in unit, the igbt output in inversion unit and line voltage cumulative after control load voltage；
Wherein, the span of feed-forward coefficients is between 0.5～2；
Described s is the complex variable in Laplace transform.
2. control method according to claim 1 it is characterised in that:
Described control method is further comprising the steps of:
When walking direction load characteristic according to load current is energy feedback type, by data acquisition unit real-time detection DC side
Voltage, and Hysteresis control is carried out to it by hystersis controller.
3. control method according to claim 2 it is characterised in that:
The concretely comprising the following steps of described hystersis controller Hysteresis control:
DC voltage according to required for inverter offset voltage, to set DC voltage reference value, sets on this basis
Stagnant ring higher limit and stagnant ring lower limit；
When DC voltage exceedes the stagnant ring higher limit of its setting, DC side discharge loop switch closure, discharge resistance works,
DC voltage starts to reduce；
When DC voltage is reduced to the stagnant ring lower limit of setting, DC side discharge loop switches off, now DC side electricity
Pressure begins to ramp up.
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| CN104836257A (en) * | 2015-06-02 | 2015-08-12 | 中国农业大学 | Integrated low-voltage ride through regulation and control device of wind power generation |
| CN106505620A (en) * | 2016-11-25 | 2017-03-15 | 国家电网公司 | A kind of transient state reconfiguration system for improving double-fed fan trouble ride-through capability and control method |
| CN109599878B (en) * | 2018-12-07 | 2020-06-02 | 南京工程学院 | Energy storage converter control method for power quality optimization demand |
| CN110752603B (en) * | 2019-09-23 | 2021-03-19 | 中国科学院电工研究所 | Compound control method of series inverter, storage medium and equipment |
| CN111416370B (en) * | 2020-03-18 | 2021-11-19 | 中国电建集团华东勘测设计研究院有限公司 | Converter device of battery energy storage power station and control method |
| CN114156897A (en) * | 2021-11-29 | 2022-03-08 | 广东电网有限责任公司 | Electric energy quality comprehensive regulation control system and control method |
| CN117096938B (en) * | 2023-10-19 | 2024-03-12 | 国网浙江省电力有限公司象山县供电公司 | Inverter output power quality adaptive control method and device and computer equipment |
| CN117559460A (en) * | 2023-11-17 | 2024-02-13 | 国网吉林省电力有限公司长春供电公司 | Middle-low voltage cloud edge cooperative voltage control method based on fusion terminal |
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| 基于等效基波及奇次谐波谐振器组的单相动态电压恢复器控制;胡磊磊等;《中国电机工程学报》;20120805;第32卷(第22期);第104-112、S14页 * |
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