CN107064698B - Voltage dip analogy method - Google Patents
Voltage dip analogy method Download PDFInfo
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- CN107064698B CN107064698B CN201710433378.4A CN201710433378A CN107064698B CN 107064698 B CN107064698 B CN 107064698B CN 201710433378 A CN201710433378 A CN 201710433378A CN 107064698 B CN107064698 B CN 107064698B
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Abstract
The present invention relates to voltage dip simulation system and methods, the system comprises main circuits and control circuit, the main circuit includes rectification unit, inversion unit and load, the input terminal of rectification unit connects power grid, the input terminal of the output end connection inversion unit of rectification unit, the output end of inversion unit connect load；The control circuit includes control unit, and the first alternating voltage and current transformer, the second alternating voltage and the current transformer and DC voltage transformer that connect with the control unit；First alternating voltage and current transformer detection enter the alternating voltage electric current of the alternating voltage electric current of rectification unit, the second alternating voltage and current transformer detection inversion unit output, and DC voltage transformer detects the DC voltage of rectification unit output；The on-off of power device in described control unit control rectification unit, inversion unit.The present invention can precision analog voltage process temporarily drops.
Description
Technical field
The present invention relates to power electronics control technology fields, more particularly to voltage dip analogy method.
Background technique
It is the most prominent with voltage dip in many power quality problems.When voltage dip occurs, it will usually make miniature
The work of the voltage sensitive equipments such as electronic computer, relay, frequency converter, embeded processor is not normal, especially when this
A little equipment applications will lead to huge economic loss in industries such as medical treatment, telecommunications, semiconductors.Voltage dip is studied to sensitivity
The Influencing Mechanism and control measures of equipment become one and are concerned problem.
Currently, the voltage dip simulator of mainstream is the voltage dip simulator based on inverter, but current electricity
Simulator temporarily drops in pressure, it is difficult to accurately simulate voltage dip process.
Summary of the invention
Based on this, the embodiment of the present invention provides voltage dip analogy method, can be improved the essence of voltage dip process simulation
Exactness.
A kind of voltage dip analogy method is suitable for a kind of voltage dip simulation system, the voltage dip simulation system
Including main circuit and control circuit；The main circuit includes rectification unit, inversion unit and load, and the input terminal of rectification unit connects
It gets access to grid, the input terminal of the output end connection inversion unit of rectification unit, the output end of inversion unit connects load；
The rectification unit includes sequentially connected exchange input reactance device, rectification side IPM and DC support capacitor；Institute
It states rectification unit and power grid is connected by the exchange input reactance device, pass through the DC support capacitance connection inversion unit；Institute
Stating inversion unit includes sequentially connected inverter side IPM and output filter circuit；The inversion unit is filtered by the output
Wave circuit connection load；
The control circuit includes control unit, and the first alternating voltage and Current Mutual Inductance that connect with the control unit
Device, the second alternating voltage and current transformer and DC voltage transformer；First alternating voltage and current transformer are also connected with whole
Unit is flowed, for detecting the alternating voltage electric current of input rectifying side IPM；Second alternating voltage and current transformer are also connected with inversion
Unit, for detecting the alternating voltage electric current of the inverter side IPM output；DC voltage transformer is also connected with rectification unit, uses
In the DC voltage of detection rectification unit output；
Described control unit is also connected with rectification side IPM and inverter side IPM, for controlling the rectification side IPM, inverter side
The on-off of power device in IPM；
The voltage dip analogy method comprising steps of
The first alternating voltage electric current that the first alternating voltage and current transformer detect is obtained, the second alternating voltage is obtained
And the second alternating voltage electric current that current transformer detects, obtain the DC voltage that DC voltage transformer detects；
It is generated and is corresponded to according to the first alternating voltage electric current, the second alternating voltage electric current and the DC voltage
The first modulated pulse signal, first modulated pulse signal is sent to rectification side IPM, to control function in rectification side IPM
The on-off of rate device；
Corresponding second modulated pulse signal is generated according to preset voltage dip characteristic quantity, the second alternating voltage electric current,
Second modulated pulse signal is sent to inverter side IPM, to control the on-off of power device in inverter side IPM.
Above-mentioned technical proposal is made up of the main circuit, control circuit and respective circuit, can accurate simulating grid
The generating process of middle voltage dip, and control flexibly, rapid dynamic response speed, it is sensitive active suitable for voltage dip or passive set
Standby immunity to interference testing research.
Detailed description of the invention
Fig. 1 is the schematic diagram of the voltage dip simulation system of an embodiment；
Fig. 2 is the schematic diagram of the voltage dip simulation system of another embodiment；
Fig. 3 is the schematic flow chart of the voltage dip analogy method of an embodiment；
Fig. 4 is the schematic illustration of rectification side current loop control in the voltage dip simulation process of an embodiment；
Fig. 5 be an application scenarios under voltage dip simulation process in inverter side control schematic flow chart.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Fig. 1 is the schematic flow chart of the voltage dip simulation system of an embodiment；In this embodiment, the voltage is temporary
Dropping simulation system includes main circuit and control circuit；The main circuit includes rectification unit, inversion unit and load, rectification unit
Input terminal connect power grid, the input terminal of the output end connection inversion unit of rectification unit, the output end connection of inversion unit is negative
It carries.
Wherein, the rectification unit includes sequentially connected exchange input reactance device, rectification side IPM (Intelligent
Power Module, i.e. intelligent power module) and DC support capacitor；The rectification unit passes through the exchange input reactance
Device connects power grid, passes through the DC support capacitance connection inversion unit；The inversion unit includes sequentially connected inverter side
IPM and output filter circuit；The inversion unit passes through output filter circuit connection load.It should be understood that described
The power grid that rectification unit is connected can be utility grid, i.e., the input of the described rectification unit is alternating current, export after over commutation
Direct current.
Wherein, the control circuit includes control unit, and the first alternating voltage and electricity that connect with the control unit
Current transformer, the second alternating voltage and current transformer and DC voltage transformer；First alternating voltage and current transformer are also
Rectification unit is connected, for detecting the alternating voltage electric current of input rectifying side IPM；Second alternating voltage and current transformer also connect
Inversion unit is connect, for detecting the alternating voltage electric current of inverter side IPM output；DC voltage transformer is also connected with rectification unit,
For detecting the DC voltage of rectification unit output.It should be understood that the first alternating voltage and current transformer, the second alternating current
Pressure and current transformer can be the device for having both voltage transformer and current transformer, or be individual voltage transformer and electricity
Current transformer.When being independent voltage transformer, current transformer, the control circuit includes two groups of AC voltage transformers
With two groups of AC current transformers.
Wherein, described control unit is also connected with rectification side IPM and inverter side IPM, for control the rectification side IPM,
The on-off of power device in inverter side IPM.It should be understood that being opened comprising several in the rectification side IPM, inverter side IPM
Close device, such as IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) and/or two
Pole pipe etc.；And the switching device in the rectification side IPM, inverter side IPM can be connected under the action of modulated pulse signal or
Person's truncation.
Voltage dip simulation system based on the above embodiment passes through the main circuit, control circuit and respective electricity
Road is constituted, can in accurate simulation power grid voltage dip generating process, and control flexibly, rapid dynamic response speed, be suitable for electricity
Sensitive active or inactive component immunity to interference testing research temporarily drops in pressure.
In a preferred embodiment, defeated by this as shown in Fig. 2, the rectification unit further includes input isolating transformer
Enter isolating transformer and can reduce and harmonic pollution is brought to power grid；Accordingly, the inversion unit further includes output isolation transformer.
The rectification unit connects power grid by the input isolating transformer, and the output end for inputting isolating transformer passes through exchange input
The ac input end of reactor connection rectification side IPM.The output end of the output filter circuit is connected by output isolation transformer
Connect load.
In a preferred embodiment, the input isolating transformer access is three-phase alternating current, accordingly, the input
Isolating transformer is three-phase isolation transformer；The exchange input reactance device is three-phase input reactor；The rectification side IPM,
Inverter side IPM is respectively three-phase bridge rectifier circuit, three-phase inverter bridge circuit；The output isolation transformer is isolated for three
Transformer.
Optionally, the input isolating transformer is traction transformer of cross connection with threephase YN-Y type isolating transformer；The output isolation transformer is
Three-phase Δ-YN type isolating transformer；The output filter circuit is LC filter.Accordingly, the connection of each section is closed in system
System are as follows: three-phase input isolating transformer is directly connected to three phase network, and input reactance is passed through in the exchange side of three-phase bridge rectifier circuit
Device is connected to three-phase input isolating transformer；The DC side of three-phase bridge rectifier circuit passes through DC support capacitor and three-phase bridge
The DC side of inverter circuit connects；The exchange side of three-phase inverter bridge circuit passes through output LC filter, output isolation transformer
Connection load.
In an alternative embodiment, described control unit is DSP control core, and for example, TMS320F28335 chip can
Realize the control of rectification unit and inversion unit.
Refering to what is shown in Fig. 2, the inversion unit further includes switch K, the load points of common connection as inversion unit.Control
Circuit obtains voltage and current information from main circuit by mutual inductor, handles and calculates by DSP control core, generates modulation pulse,
The power device on-off in main circuit is triggered, to realize that the simulation of voltage dip occurs.Also, it is born when loading for passive electricity consumption
When lotus, rectification side obtains electric energy from power grid by input isolating transformer, maintains DC voltage constant；When load is active equipment
When, rectification side can be by extra energy back to power grid while maintaining dc-voltage balance.Thus it can realize that energy is two-way
Flowing is suitable for the test of the active equipments voltage dip such as dynamic electric voltage recovery device (DVR), renewable energy grid-connecting apparatus and uses,
And not to power grid harmonic and reactive power.
Voltage dip simulation system based on the above embodiment, Fig. 3 are a kind of schematic stream of voltage dip analogy method
Cheng Tu, comprising steps of
S11 obtains the first alternating voltage electric current that the first alternating voltage and current transformer detect, obtains the second exchange
The second alternating voltage electric current that voltage and current mutual inductor detects obtains the DC voltage that DC voltage transformer detects.
With reference to described in the above system embodiment, first alternating voltage and current transformer detection be input rectifying side
The alternating voltage electric current of IPM；What second alternating voltage and current transformer detected is the alternating voltage of inverter side IPM output
Electric current；What the DC voltage transformer detected is the DC voltage of rectification unit output.
S12, according to the first alternating voltage electric current, the second alternating voltage electric current and the DC voltage and current
Corresponding first modulated pulse signal is generated, first modulated pulse signal is sent to rectification side IPM, to control rectification side
The on-off of power device in IPM.
S13 generates corresponding second modulation pulse letter according to preset voltage dip characteristic quantity, the second alternating voltage electric current
Number, second modulated pulse signal is sent to inverter side IPM, to control the on-off of power device in inverter side IPM.
It should be understood that the executing subject of above-mentioned steps can be control unit, and above-mentioned steps S12, S13 can be held simultaneously
Row, to control rectification side IPM and inverter side IPM simultaneously.
In the present embodiment, described control unit pass through modulated pulse signal control rectification side, in inverter side device on-off.
It is understood that also can be used other signals control rectification side except modulated pulse signal, in inverter side device on-off.
Voltage dip analogy method through the foregoing embodiment improves the current loop control of rectification side in rectification side, can
It realizes rectification side and inverter side power decoupled, inhibits the fluctuation of DC voltage in voltage dip generating process；It is controlled in inverter side
Without feedback loop, reduce hardware computing resource expense, rapid dynamic response speed, and amplitude between phase and phase can be met automatically
Generating process temporarily drops in phase relation, effective analog voltage.
In an alternative embodiment, in above-mentioned steps S12, according to the first alternating voltage electric current, second exchange
Voltage and current and the DC voltage generate corresponding first modulated pulse signal, comprising:
The d axis active current of output filter circuit output is calculated according to the second alternating voltage electric current；According to described straight
Galvanic electricity pressure calculates the direct current pressure ring output valve of rectification unit；The d axis active current that the output filter circuit is exported
It as feed-forward signal, is overlapped with the direct current pressure ring output valve of rectification unit, obtains the d axis watt current ginseng of rectification unit
Examine value；According to the first alternating voltage electric current, the d axis watt current reference value and preset q shaft current reference value, to rectification
Unit carries out electric current loop PI control, obtains corresponding modulating wave by dq feed forward decoupling control, generates the according to the modulating wave
One modulated pulse signal.
In an alternative embodiment, the active electricity of d axis of output filter circuit output is calculated according to the second alternating voltage electric current
Flow component are as follows:
id_inv=(v'αi'α+v'βi'β)/ed
Wherein, id_invFor the d axis watt current of output filter circuit output, v'α、v'βAnd i'α、i'βRespectively load electricity
Pressure, α axis component of the electric current under two-phase stationary coordinate system, beta -axis component, edFor the d axis component of network voltage.
It is right according to the first alternating voltage electric current, the d axis watt current reference value and preset q shaft current reference value
Rectification unit carries out electric current loop PI control, obtains corresponding modulating wave by dq feed forward decoupling control, comprising:
Establish the rectification unit state space equation under dq coordinate system are as follows:
Wherein, L, R are respectively the equivalent inductance and equivalent resistance for exchanging input reactance device；ed、eqThe respectively d axis of power grid
Component of voltage, q shaft voltage component, id、iqD shaft current component, the q shaft current component of inductance in input reactance device are respectively exchanged,
sd、sqRespectively d axis modulated signal component, q axis modulated signal component, PrecFor the active power of rectification side IPM output, PinvFor
The active power of inverter side IPM output, ω are power grid pulsation, vdcFor the DC voltage of rectification unit output, C is
DC support capacitor.
Rectification unit electric current loop PI governing equation is established with d axis orientation according to rectification unit state space equation are as follows:
The alternating voltage of rectification side IPM is obtained according to electric current loop PI governing equation are as follows:
Wherein,Respectively d shaft voltage and q shaft voltage, id_ref、iq_refFor preset q shaft current instruction value and d
Shaft current instruction value；KiP、KiIRespectively the proportionality coefficient and integral coefficient of electric current loop PI controller, s are Laplace operator；
It willBe converted to the α axis component under two-phase stationary coordinate systemBeta -axis componentAccording toIt obtains
The corresponding modulating wave of rectification unit.
In an alternative embodiment, refering to what is shown in Fig. 4, wherein, the direct current of rectification unit is calculated according to the DC voltage
The specific implementation of Voltage loop output valve can include:
The DC voltage of rectification unit output is subjected to digital filter, and is carried out compared with preset DC voltage instruction value
PI is adjusted, and obtains the direct current pressure ring output valve of rectification unit；The d axis active current that the output filter circuit is exported
It as feed-forward signal, is overlapped with the direct current pressure ring output valve of rectification unit, obtains the d axis watt current ginseng of rectification unit
Examine value are as follows:
Wherein, id_refIndicate the d axis watt current reference value of rectification unit, KvP、KvIRespectively indicate Voltage loop PI controller
Proportionality coefficient and integral coefficient, s is Laplace operator, vdcFor the DC voltage of rectification unit output, vdc_refIt is preset
DC voltage instruction value.
In an alternative embodiment, in above-mentioned steps S13, according to preset voltage dip characteristic quantity, the second alternating voltage
Electric current generates corresponding second modulated pulse signal, comprising:
Preset voltage dip characteristic quantity is obtained, the voltage dip characteristic quantity includes voltage dip type, amplitude, continues
Time and/or starting point temporarily drops；Output filtered electrical is calculated according to the voltage dip characteristic quantity and the second alternating voltage electric current
The positive and negative zero-sequence component of road output voltage；Obtain positive and negative zero sequence modulated signal according to the positive and negative zero-sequence component, according to it is described just
Negative zero sequence modulated signal generates the second modulated pulse signal.
In an alternative embodiment, further comprise the steps of: precalculate inverter side IPM dead zone be averaged fundamental voltage loss,
It is averaged the voltage equation of fundamental voltage costing bio disturbance inverter side IPM dead time effect according to dead zone, and the voltage equation is converted
At positive and negative zero sequence equation, the positive and negative zero sequence equation is used to calculate the positive and negative zero-sequence component of inverter side IPM output voltage.
Such as: calculate inverter side IPM dead zone be averaged fundamental voltage lose are as follows:
Wherein, VeFor dead zone be averaged fundamental voltage loss, uT、uDBe respectively inverter side IPM the pressure drop of IGBT saturation conduction and
Diode conduction voltage drop, td、ton、toffThe respectively dead time of inverter side IPM, turn-on time, turn-off time, TcIt is default
The modulated pulse signal period, vdcFor the DC voltage of rectification unit output；
The voltage equation of meter and inverter side IPM dead time effect are as follows:
Wherein,For inverter side IPM output alternating voltage,For the inductive current of output filter circuit,For
The voltage of output filter circuit output,It is lost for dead zone voltage,For the equivalent impedance of output filter circuit；For the pulsation of inverter side IPM output；
By symmetrical component method, positive and negative zero sequence equation is converted by the voltage equation are as follows:
Wherein,For inverter side IPM output positive and negative residual voltage,For in output filter circuit inductance it is positive and negative
Zero-sequence current,For output filter circuit output positive and negative residual voltage,For the positive and negative zero-sequence component of dead zone voltage, vdc
For rectification unit output DC voltage,For the positive and negative zero-sequence component of modulating wave.
In conjunction with shown in Fig. 2, Fig. 4 and Fig. 5, the voltage dip analogy method of the above embodiment of the present invention is made into one below
The explanation of step.
As shown in Fig. 2, related voltage dip simulation system includes YNY type isolating transformer, input reactance device, rectification
It is IPM, DC support capacitor, inversion IPM, output LC filter, Δ-YN type isolating transformer, alternating voltage current transformer, straight
It flows voltage transformer and using DSP28335 as the control system of core, K is switch, and load points of common connection.Pass through mutual inductance
Device obtains voltage and current information from main circuit, handles and calculates by DSP control system, generates modulation pulse, triggers main circuit function
On-off during rate, to realize that the simulation of voltage dip occurs.
Assuming that the parameter of three-phase alternating current input reactance device is identical, equivalent inductance and equivalent resistance are respectively L and R, then obtain
It can to the rectification side state space equation under dq coordinate system are as follows:
Wherein, L, R are respectively the equivalent inductance and equivalent resistance for exchanging input reactance device；ed、eqThe respectively d axis of power grid
Component of voltage, q shaft voltage component, id、iqD shaft current component, the q shaft current component of inductance in input reactance device are respectively exchanged,
sd、sqRespectively d, q axis component of modulated signal, PrecFor the active power of rectification side IPM output, PinvFor inverter side IPM output
Active power, ω be power grid pulsation, vdcFor the DC voltage of rectification unit output, C is DC support capacitor.
With d axis orientation, then d, q shaft current respectively represent the active and reactive component of alternating current, and the two exists certain
Coupled relation in the present embodiment, passes through the independent control that feed forward decoupling control realizes rectification side watt current and reactive current.It examines
Considering three-phase symmetric voltage electric current is all DC quantity after Park Transformation, zero steady state error control can be realized using PI control, i.e.,
With d axis orientation, the electric current loop PI governing equation of rectification unit is established are as follows:
The alternating voltage that rectification side IPM can be obtained is
Wherein,Respectively d shaft voltage and q shaft voltage, id_ref、iq_refFor preset q shaft current instruction value and d
Shaft current instruction value (being respectively referenced reactive current value and active current command value)；KiP、KiIRespectively electric current loop PI control
The proportionality coefficient and integral coefficient of device, s are Laplace operator.It is idle to avoid injecting to power grid, it is preferable that setting iq_ref=
0。
Formula (3) is rectification side current loop control equation, realizes the active and idle decoupling control of rectification side.While by
There is also power to couple as it can be seen that rectification side is with inverter side for formula (1), and during analog voltage will temporarily occur, load voltage occurs
Mutation will lead to the active mutation of inverter side, thus the DC voltage fluctuation for exporting rectification unit.In one embodiment, by direct current
Voltage loop generates active command value, and in order to inhibit DC voltage fluctuation, the wattful power of inverter side is calculated by instantaneous power theory
Rate, and the active power of superposition inverter side is corresponding active when the d axis meritorious reference current of rectification side current loop control generates
Electric current, i.e.,
Wherein, KvP、KvIThe respectively proportionality coefficient and integral coefficient of Voltage loop PI controller, id_invFor the d axis of inverter side
Watt current, expression formula are
id_inv=(v'αi'α+v'βi'β)/ed (5)
Wherein, v'α、v'β、i'α、i'βThe voltage and current of respectively inverter side IPM output is under two-phase stationary coordinate system
α, beta -axis component.Finally, it is as shown in Figure 4 to obtain rectification side control structure figure.
Fig. 5 is the control algolithm flow chart that inverter side generates voltage dip.(i.e. pulse width modulation) process is controlled in PWM
In, since the conducting and shutdown of the power device of inverter side IPM require the regular hour, upper and lower bridge arm is led simultaneously in order to prevent
It is logical, it joined one section of dead time.Inverter side generate voltage dip control algolithm process include:
Obtain voltage dip type, amplitude, duration, the temporarily characteristic quantities such as drop starting point；According to dead time, power device
Part turn-on time and turn-off time, tube voltage drop etc. calculate inverter side IPM dead zone voltage.The average fundamental voltage damage as caused by dead zone
Losing can be indicated with formula (6):
Wherein, VeAmplitude, u are lost for average fundamental voltageT、uDBe respectively inverter side IPM the pressure drop of IGBT saturation conduction and
Diode conduction voltage drop, td、ton、toffRespectively dead time, turn-on time, turn-off time, TcFor preset PWM cycle.It answers
Considerable to be, the dead zone voltage phase of each phase is opposite with the phase current.
Column write the inverter side voltage equation for considering dead time effect, and are converted to positive and negative zero sequence equation.
Assuming that loading the three-phase voltage at points of common connection K is during voltage dipThree pole reactor electric current isThree-phase bridge type converter ac output voltage isFor the equivalent impedance of output filter circuit；For
The pulsation of inverter side IPM output, dead zone voltage loss areThen
By symmetrical component method, it is as follows to be converted into positive and negative zero sequence equation:
Wherein,For the positive and negative residual voltage at points of common connection K,For the positive and negative zero-sequence current of three pole reactor,The positive and negative residual voltage of output is exchanged for three-phase bridge type converter,The positive and negative zero-sequence component of dead zone voltage,To adjust
The positive and negative zero-sequence component of wave processed.
Each phase temporary decline, the phase relation of three-phase bridge type converter exchange output are extracted, with above-mentioned positive and negative zero sequence equation
Positive and negative zero sequence modulation ratio is calculated separately, three-phase modulations ratio is then converted into, obtains the amplitude and phase of each phase modulated signal.
For three-phase without neutral conductor system, zero-sequence current cannot circulate, therefore haveThen:
The corresponding three-phase modulations wave of three-phase bridge type converter can be obtained by formula (8) are as follows:
Wherein, T is spin matrix, a=ej120°For twiddle factor.
At the time of judging that current control period is that temporary drop starting point corresponds to? if so, voltage dip algorithm is executed, according to
Formula (9) gives Modulated Signal；Otherwise, at the time of continuing to judge whether current control period is that temporary drop starting point corresponds to.
When receiving voltage dip instruction, the corresponding modulating wave of three-phase bridge type converter is calculated using formula (9), passes through
SPWM modulation technique controls the power device on-off of three-phase bridge type converter, and process temporarily drops in analog voltage.Judge whether to reach simultaneously
To the temporary drop duration of setting? if so, otherwise the control for terminating three-phase bridge type converter continues to execute voltage dip algorithm,
Modulated Signal is given according to formula (9).
Optionally, for the processing of voltage dip starting point and voltage dip duration are as follows: it is corresponding to set temporarily drop starting point
Angle beDuration is t, and the control period is Ts, then the control periodicity n of voltage dip starting point1It is held with voltage dip
The control periodicity n of continuous time2It is respectively as follows:
Voltage dip analogy method based on the above embodiment, has the advantage that
By improving rectification side current regulator, realizes rectification side and inverter side power decoupled, inhibit voltage dip
The fluctuation of DC voltage in the process；
The control mode in line computation modulation ratio that inverter side control is influenced using meter and dead zone, is not necessarily to feedback loop, reduces
Hardware computing resource expense, rapid dynamic response speed, and amplitude phase relationship between phase and phase can be met automatically；
Energy in bidirectional flow can be achieved, it is active to be suitable for dynamic electric voltage recovery device (DVR), renewable energy grid-connecting apparatus etc.
The test of equipment voltage dip uses, and not to power grid harmonic and reactive power；
Comprehensively considering voltage dip multi-characteristicquantity quantity includes temporarily dropping type, amplitude, duration, temporarily drop starting point etc., accurately
Generating process temporarily drops in analog voltage.
It should be noted that for the various method embodiments described above, describing for simplicity, it is all expressed as a series of
Combination of actions, but those skilled in the art should understand that, the present invention is not limited by the sequence of acts described, because according to
According to the present invention, certain steps can use other sequences or carry out simultaneously.
In the above-described embodiments, it all emphasizes particularly on different fields to the description of each embodiment, there is no the portion being described in detail in some embodiment
Point, it may refer to the associated description of other embodiments.It is appreciated that term " first ", " second " used in wherein etc. is at this
For distinguishing object in text, but these objects should not be limited by these terms.
The embodiments described above only express several embodiments of the present invention, should not be understood as to the invention patent range
Limitation.It should be pointed out that for those of ordinary skill in the art, without departing from the inventive concept of the premise,
Various modifications and improvements can be made, and these are all within the scope of protection of the present invention.Therefore, the scope of protection of the patent of the present invention
It should be determined by the appended claims.
Claims (10)
1. a kind of voltage dip analogy method, which is characterized in that be suitable for a kind of voltage dip simulation system, the voltage dip
Simulation system includes main circuit and control circuit；The main circuit includes rectification unit, inversion unit and load, rectification unit
Input terminal connects power grid, the input terminal of the output end connection inversion unit of rectification unit, and the output end of inversion unit connects load；
The rectification unit includes sequentially connected exchange input reactance device, rectification side IPM and DC support capacitor；It is described whole
It flows unit and power grid is connected by the exchange input reactance device, pass through the DC support capacitance connection inversion unit；It is described inverse
Becoming unit includes sequentially connected inverter side IPM and output filter circuit；The inversion unit passes through the output filtered electrical
Road connection load；
The control circuit includes control unit, and connect with the control unit the first alternating voltage and current transformer,
Second alternating voltage and current transformer and DC voltage transformer；It is single that first alternating voltage and current transformer are also connected with rectification
Member, for detecting the alternating voltage electric current of input rectifying side IPM；Second alternating voltage and current transformer are also connected with inversion list
Member, for detecting the alternating voltage electric current of the inverter side IPM output；DC voltage transformer is also connected with rectification unit, is used for
Detect the DC voltage of rectification unit output；
Described control unit is also connected with rectification side IPM and inverter side IPM, for controlling the rectification side IPM, inverter side IPM
The on-off of middle power device；
The voltage dip analogy method comprising steps of
The first alternating voltage electric current that the first alternating voltage and current transformer detect is obtained, the second alternating voltage and electricity are obtained
The second alternating voltage electric current that current transformer detects obtains the DC voltage that DC voltage transformer detects；
Corresponding the is generated according to the first alternating voltage electric current, the second alternating voltage electric current and the DC voltage
First modulated pulse signal is sent to rectification side IPM, to control power device in rectification side IPM by one modulated pulse signal
The on-off of part；
Corresponding second modulated pulse signal is generated according to preset voltage dip characteristic quantity, the second alternating voltage electric current, by institute
It states the second modulated pulse signal and is sent to inverter side IPM, to control the on-off of power device in inverter side IPM.
2. voltage dip analogy method according to claim 1, which is characterized in that in the voltage dip simulation system,
The rectification unit further includes input isolating transformer, and the rectification unit connects power grid by the input isolating transformer,
The output end for inputting isolating transformer connects the ac input end of rectification side IPM by exchange input reactance device.
3. voltage dip analogy method according to claim 1 or 2, which is characterized in that the inversion unit further includes defeated
Isolating transformer out, the output end of the output filter circuit is connected by output isolation transformer to be loaded；
And/or described control unit is DSP control core.
4. voltage dip analogy method according to claim 1, which is characterized in that according to the first alternating current piezoelectricity
Stream, the second alternating voltage electric current and the DC voltage generate corresponding first modulated pulse signal, comprising:
The d axis active current of output filter circuit output is calculated according to the second alternating voltage electric current；
The direct current pressure ring output valve of rectification unit is calculated according to the DC voltage；
DC voltage of the d axis active current that the output filter circuit is exported as feed-forward signal, with rectification unit
Ring output valve is overlapped, and obtains the d axis watt current reference value of rectification unit；
According to the first alternating voltage electric current, the d axis watt current reference value and preset q shaft current reference value, to rectification
Unit carries out electric current loop PI control, and obtains corresponding modulating wave by dq feed forward decoupling control, is generated according to the modulating wave
First modulated pulse signal.
5. voltage dip analogy method according to claim 4, which is characterized in that calculated according to the second alternating voltage electric current
The d axis active current of output filter circuit output are as follows:
id_inv=(v'αi'α+v'βi'β)/ed
Wherein, id_invFor the d axis watt current of output filter circuit output, v'α、v'βAnd i'α、i'βRespectively load voltage, electricity
Flow α axis component under two-phase stationary coordinate system, beta -axis component, edFor the d axis component of network voltage.
6. voltage dip analogy method according to claim 4, which is characterized in that according to the first alternating voltage electric current, institute
D axis watt current reference value and preset q shaft current reference value are stated, electric current loop PI control is carried out to rectification unit, passes through dq
Feed forward decoupling control obtains corresponding modulating wave, comprising:
Establish the rectification unit state space equation under dq coordinate system are as follows:
Wherein, L, R are respectively the equivalent inductance and equivalent resistance for exchanging input reactance device；ed、eqThe respectively d shaft voltage of power grid
Component, q shaft voltage component, id、iqRespectively exchange d shaft current component, the q shaft current component of inductance in input reactance device, sd、
sqRespectively d axis modulated signal component, q axis modulated signal component, PrecFor the active power of rectification side IPM output, PinvIt is inverse
Become the active power of side IPM output, ω is power grid pulsation, vdcFor the DC voltage of rectification unit output, C is straight
Flow Support Capacitor；
Rectification unit electric current loop PI governing equation is established with d axis orientation according to rectification unit state space equation are as follows:
The alternating voltage of rectification side IPM is obtained according to electric current loop PI governing equation are as follows:
Respectively d shaft voltage and q shaft voltage, iq_ref、id_refIt is instructed for preset q shaft current instruction value and d shaft current
Value；KiP、KiIRespectively the proportionality coefficient and integral coefficient of electric current loop PI controller, s are Laplace operator；
It willBe converted to the α axis component under two-phase stationary coordinate systemBeta -axis componentAccording toObtain rectification
The corresponding modulating wave of unit.
7. voltage dip analogy method according to claim 4, which is characterized in that calculated and rectified according to the DC voltage
The direct current pressure ring output valve of unit, comprising:
The DC voltage of rectification unit output is subjected to digital filter, and carries out PI tune compared with preset DC voltage instruction value
Section, obtains the direct current pressure ring output valve of rectification unit；
DC voltage of the d axis active current that the output filter circuit is exported as feed-forward signal, with rectification unit
Ring output valve is overlapped, and obtains the d axis watt current reference value of rectification unit are as follows:
Wherein, id_refIndicate the d axis watt current reference value of rectification unit, KvP、KvIRespectively indicate the ratio of Voltage loop PI controller
Example coefficient and integral coefficient, s are Laplace operator, vdcFor the DC voltage of rectification unit output, vdc_refFor preset direct current
Voltage instruction value, id_invFor the d axis watt current of output filter circuit output.
8. voltage dip analogy method according to claim 1, which is characterized in that according to preset voltage dip feature
Amount, the second alternating voltage electric current generate corresponding second modulated pulse signal, comprising:
Preset voltage dip characteristic quantity is obtained, the voltage dip characteristic quantity includes voltage dip type, amplitude, duration
And/or starting point temporarily drops；
The positive and negative of output filter circuit output voltage is calculated according to the voltage dip characteristic quantity and the second alternating voltage electric current
Zero-sequence component；
Positive and negative zero sequence modulated signal is obtained according to the positive and negative zero-sequence component, generates second according to the positive and negative zero sequence modulated signal
Modulated pulse signal.
9. voltage dip analogy method according to claim 8, which is characterized in that further comprise the steps of:
The dead zone fundamental voltage that be averaged for calculating inverter side IPM loses, and is averaged fundamental voltage costing bio disturbance inverter side IPM according to dead zone
The voltage equation of dead time effect, and the voltage equation is converted to positive and negative zero sequence equation, the positive and negative zero sequence equation is based on
Calculate the positive and negative zero-sequence component of inverter side IPM output voltage.
10. voltage dip analogy method according to claim 9, which is characterized in that the dead zone for calculating inverter side IPM is average
Fundamental voltage loss are as follows:
Wherein, VeFor dead zone be averaged fundamental voltage loss, uT、uDIt is the pressure drop of IGBT saturation conduction and two poles of inverter side IPM respectively
Pipe conduction voltage drop, td、ton、toffThe respectively dead time of inverter side IPM, turn-on time, turn-off time, TcFor preset tune
Pulse signal cycle processed, vdcFor the DC voltage of rectification unit output；
The voltage equation of the dead time effect of meter and inverter side IPM are as follows:
Wherein,For inverter side IPM output alternating voltage,For the inductive current of output filter circuit,For output
The voltage of filter circuit output,It is lost for dead zone voltage,For the equivalent impedance of output filter circuit；For
The pulsation of inverter side IPM output；
By symmetrical component method, positive and negative zero sequence equation is converted by the voltage equation are as follows:
Wherein,For inverter side IPM output positive and negative residual voltage,For the positive and negative zero sequence of inductance in output filter circuit
Electric current,For output filter circuit output positive and negative residual voltage,For the positive and negative zero-sequence component of dead zone voltage, vdcIt is whole
The DC voltage of unit output is flowed,For the positive and negative zero-sequence component of modulating wave.
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| CN209592991U (en) * | 2019-03-28 | 2019-11-05 | 南京国臣信息自动化技术有限公司 | A kind of voltage dip abatement equipment based on alternating current-direct current hybrid power supply technology |
| CN110011305A (en) * | 2019-04-23 | 2019-07-12 | 安徽大学 | A kind of controlling device that rail traffic low-voltage system voltage temporarily drops |
| CN112710892A (en) * | 2019-10-25 | 2021-04-27 | 中国石油化工股份有限公司 | Voltage sag simulation method and device |
| CN111865102A (en) * | 2020-07-29 | 2020-10-30 | 保定桑谷电气科技有限公司 | Electronic type analog load system |
| CN115549140B (en) * | 2022-10-18 | 2024-04-02 | 国网湖北省电力有限公司电力科学研究院 | Supporting capacity detection device of net-structured energy storage system and operation method thereof |
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