CN104007398B - A kind of inverter subelement full working scope closed loop control test method - Google Patents
A kind of inverter subelement full working scope closed loop control test method Download PDFInfo
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Abstract
The present invention provides a kind of inverter subelement full working scope closed loop control test method, comprises the following steps: calculates and connects inductive current;Calculate real component and the idle component connecting inductive current;The voltage calculating connection inductance exchanges terminal voltage with inverter subelement;Calculate real component reference value and the idle component reference value connecting inductive current;Use pi regulator regulation inverter subelement both end voltage.The inverter subelement full working scope closed loop control test method that the present invention provides, achieve the test simulation of chain-type inverter subelement actual condition, single test can meet the test of inverter subelement main circuit, take the Multitests such as energy loop test, sampling circuit test and cell controller function test, short form test flow process, and electric energy loss can be saved, reduce bulge test cost.
Description
Technical field
The invention belongs to electric and electronic technical field, be specifically related to a kind of inverter subelement full working scope closed loop control test method.
Background technology
It is widely used in the chain-type inverter of high power electronic equipment by the cascade of some identical inverter subelements
Become.Wherein, cascade subelement uses without differences configuration, and each subelement uses H bridge topology.In chain topology, change
In stream unit, power electronic devices running voltage is effectively clamped on DC capacitor voltage, it is to avoid power electronic devices tandeming problems,
Meanwhile, the voltage levvl of a whole set of power electronic equipment can be improved by increasing the number of concatenation unit, enormously simplify height
Pressure inverter design.Its test method, as the core of reactive power compensator main circuit, is deeply ground by chain-type inverter
Study carefully significant and engineer applied value.
At present, the experimental technique that the test of single inverter generally uses is to connect diode rectifier circuit at Converter DC-side to be measured,
Thering is provided galvanic current pressure for inverter, now inverter works in inverter mode;The inductive loads such as load side joint motor, but
It is to absorb network re-active power using motor as load, causes the waste of electric energy.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the present invention provides a kind of inverter subelement full working scope closed loop control test method,
Achieve the test simulation of chain-type inverter subelement actual condition, single test can meet inverter subelement main circuit test,
Take the Multitests such as energy loop test, sampling circuit test and cell controller function test, short form test flow process.
In order to realize foregoing invention purpose, the present invention adopts the following technical scheme that:
A kind of inverter subelement full working scope closed loop control test method, described inverter subelement is provided to connect with alternating current power supply, master
Tentaculum, bypass contactor, soft start resistance and connection inductance collectively constitute test main circuit;Described alternating current power supply, main contactor,
Bypass contactor, connection inductance and inverter subelement are sequentially connected with, and described soft start resistance is in parallel with bypass contactor;Described
Method comprises the following steps:
Step 1: calculate and connect inductive current;
Step 2: calculate real component and the idle component connecting inductive current;
Step 3: the voltage calculating connection inductance exchanges terminal voltage with inverter subelement;
Step 4: calculate real component reference value and the idle component reference value connecting inductive current;
Step 5: use pi regulator regulation inverter subelement both end voltage.
In described step 1, if the phase angle connecting inductive current and AC supply voltage isSpecifically have:
Wherein, iLT () is that t connects inductive current, ILmFor connecting the current peak of inductance;ω is angular velocity.
In described step 2, connect real component and AC supply voltage homophase, its idle component and the alternating voltage of inductive current
Differ 90 degree, then have:
Wherein, ILpAnd ILqIt is respectively real component and the idle component connecting inductive current;
Convolution (1), (2) and (3) can obtain:
iL(t)=ILpsinωt+ILqcosωt (4)
Formula (4) left and right, with being multiplied by cos ω t, can obtain:
From formula (5), by iLT () is multiplied by cos ω t, filter I through low pass filterLpSin2 ω t and ILqCos2 ω t, then take advantage of
With 2, the real component of inductance just can be connected;
In like manner, the idle component of inductance can be connected, specifically have:
Formula (4) left and right, with being multiplied by sin ω t, can obtain:
From formula (6), by iLT () is multiplied by sin ω t, filter I through low pass filterLpCos2 ω t and ILqSin2 ω t, then take advantage of
With 2, the idle component of inductance just can be connected.
In described step 3, it is assumed that it is just that electric current flows through connection inductance direction from bypass contactor to inverter subelement, can obtain:
Wherein, ULAnd UABThe voltage being respectively connection inductance exchanges terminal voltage, U with inverter subelementNFor alternating current power supply
Voltage, L is the inductance value connecting inductance;Can be obtained by formula (7):
UL=ω L × (ILpcosωt-ILqsinωt) (8)
UAB=UN-ωL×(ILpcosωt-ILqsinωt) (9)。
In described step 4, the real component reference value and the idle component reference value that connect inductive current are expressed as:
ILpref=Kp1×(Uref-Udc)+Ki1×∫(Uref-Udc)dt (10)
ILqref=Kp2×(Iref-ILq)+Ki2×∫(Iref-ILq)dt (11)
Wherein, ILprefAnd ILqrefIt is respectively real component reference value and idle component reference value, the K connecting inductive currentp1And Kp2
It is the adjustment factor of described pi regulator, UrefAnd UdcIt is respectively inverter subelement DC voltage desired value and measured value, Iref
For connecting the real component desired value of inductive current, Ki1And Ki2It is the integral coefficient of pi regulator.
In described step 5, according to the real component reference value connecting inductive current calculated and idle component reference value, use
Pi regulator regulation inverter subelement both end voltage, thus change the input current of inverter subelement.
Compared with prior art, the beneficial effects of the present invention is:
1. achieving the test simulation of chain-type inverter subelement actual condition, single test can meet the main electricity of inverter subelement
Road is tested, is taken the Multitests such as energy loop test, sampling circuit test and cell controller function test, short form test flow process.
2. topological structure is simple, only comprises experiment power supply, linked reactor, tested inverter subelement, reduces testing equipment
Cost;
3., during test, linked reactor is only by reactive current, and pilot system can be saved electric energy loss, be reduced bulge test
Cost;
4. possess perfect closed loop control and Preservation tactics, it is achieved that auto-control, decrease artificial participation, improve and produce effect
Rate.
Accompanying drawing explanation
Fig. 1 is inverter subelement topology diagram in the embodiment of the present invention;
Fig. 2 is test main circuit structure figure in the embodiment of the present invention;
Fig. 3 is inverter subelement full working scope closed loop control test equivalent circuit diagram in the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawings the present invention is described in further detail.
Chain-type inverter is to be formed by the cascade of some identical inverter subelements, and wherein, cascade subelement uses zero difference
Changing configuration, each inverter subelement uses H bridge topology, is followed by direct current capacitors and equalizing resistance, and its main wiring diagram is by Fig. 1
Shown in.Each cell location intelligent cell controller one piece, the sampling of functional packet enclosed tool cell data, logic control and subelement level
Protection.In chain topology, in inverter subelement, power electronic devices running voltage is effectively clamped on DC capacitor voltage,
Avoid power electronic devices tandeming problems, meanwhile, a whole set of power electronics can be improved by increasing the number of concatenation unit
The voltage levvl of device, enormously simplify high voltage current changer design.
The invention provides a kind of inverter subelement full working scope closed loop control test method, such as Fig. 2, inverter subelement and friendship
Stream power supply, main contactor, bypass contactor, soft start resistance and connection inductance collectively constitute test main circuit;Described alternating current
Source, main contactor, bypass contactor, connection inductance and inverter subelement are sequentially connected with, and described soft start resistance connects with bypass
Tentaculum is in parallel.
Wherein, inverter subelement works in closed loop control mode, exports reactive current by reactor, it is ensured that target inverter
It is operated under rated voltage and rated current.During for avoiding controlled rectification, there is overshoot voltage in change of current module, needs before connecting inductance
Access soft start resistance, after capacitance voltage is stable, excise soft start resistance.Soft start resistance change of current module complete test time,
Discharge time can be shortened, meanwhile, also can increase system damping when change of current module normally works, strengthen control system stable
Property.Due to linked reactor only by reactive current, subelement pilot system can be saved electric energy, be reduced bulge test cost.
Use closed loop feedback control principle as follows:
Full working scope test equivalent circuit is as it is shown on figure 3, wherein L is for connecting inductance, UNFor supply voltage, UABFor inverter
Unit exchange terminal voltage, for connecting inductive drop UL, dead resistance, for convenience of analyzing, is ignored, is had UN=UL+UAB。
By regulation inverter subelement both end voltage UAB, voltage on inductance can be changed, thus change module input current IL。
For realizing the output of test platform full capacity reactive current, inverter subelement electric current need to be detected and extract real component, idle
Component.Stablizing of DC voltage is controlled by the size of the regulation active component of current;Idle instruction current as required calculates
Go out module output voltage UAB, the idle output electric current of device is changed by regulating this voltage.
Said method comprising the steps of:
Step 1: calculate and connect inductive current;
Step 2: calculate real component and the idle component connecting inductive current;
Step 3: the voltage calculating connection inductance exchanges terminal voltage with inverter subelement;
Step 4: calculate real component reference value and the idle component reference value connecting inductive current;
Step 5: use pi regulator regulation inverter subelement both end voltage.
In described step 1, if the phase angle connecting inductive current and AC supply voltage isSpecifically have:
Wherein, iLT () is that t connects inductive current, ILmFor connecting the current peak of inductance;ω is angular velocity.
In described step 2, connect real component and AC supply voltage homophase, its idle component and the alternating voltage of inductive current
Differ 90 degree, then have:
Wherein, ILpAnd ILqIt is respectively real component and the idle component connecting inductive current;
Convolution (1), (2) and (3) can obtain:
iL(t)=ILpsinωt+ILqcosωt (4)
Formula (4) left and right, with being multiplied by cos ω t, can obtain:
From formula (5), by iLT () is multiplied by cos ω t, filter I through low pass filterLpSin2 ω t and ILqCos2 ω t, then take advantage of
With 2, the real component of inductance just can be connected;
In like manner, the idle component of inductance can be connected, specifically have:
Formula (4) left and right, with being multiplied by sin ω t, can obtain:
From formula (6), by iLT () is multiplied by sin ω t, filter I through low pass filterLpCos2 ω t and ILqSin2 ω t, then take advantage of
With 2, the idle component of inductance just can be connected.
In described step 3, it is assumed that it is just that electric current flows through connection inductance direction from bypass contactor to inverter subelement, can obtain:
Wherein, ULAnd UABThe voltage being respectively connection inductance exchanges terminal voltage, U with inverter subelementNFor alternating current power supply
Voltage, L is the inductance value connecting inductance;Can be obtained by formula (7):
UL=ω L × (ILpcosωt-ILqsinωt) (8)
UAB=UN-ωL×(ILpcosωt-ILqsinωt) (9)。
In described step 4, the real component reference value and the idle component reference value that connect inductive current are expressed as:
ILpref=Kp1×(Uref-Udc)+Ki1×∫(Uref-Udc)dt (10)
ILqref=Kp2×(Iref-ILq)+Ki2×∫(Iref-ILq)dt (11)
Wherein, ILprefAnd ILqrefIt is respectively real component reference value and idle component reference value, the K connecting inductive currentp1And Kp2
It is the adjustment factor of described pi regulator, UrefAnd UdcIt is respectively inverter subelement DC voltage desired value and measured value, Iref
For connecting the real component desired value of inductive current, Ki1And Ki2It is the integral coefficient of pi regulator.
In described step 5, according to the real component reference value connecting inductive current calculated and idle component reference value, use
Pi regulator regulation inverter subelement both end voltage, thus change the input current of inverter subelement.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although reference
The present invention has been described in detail by above-described embodiment, those of ordinary skill in the field it is understood that still can to this
Invention detailed description of the invention modify or equivalent, and without departing from spirit and scope of the invention any amendment or etc.
With replacing, it all should be contained in the middle of scope of the presently claimed invention.
Claims (1)
1. an inverter subelement full working scope closed loop control test method, it is characterised in that: described inverter subelement with exchange
Power supply, main contactor, bypass contactor, soft start resistance and connection inductance collectively constitute test main circuit;Described alternating current power supply,
Main contactor, bypass contactor, connection inductance and inverter subelement are sequentially connected with, described soft start resistance and bypass contactor
In parallel;Said method comprising the steps of:
Step 1: calculate and connect inductive current;
Step 2: calculate real component and the idle component connecting inductive current;
Step 3: the voltage calculating connection inductance exchanges terminal voltage with inverter subelement;
Step 4: calculate real component reference value and the idle component reference value connecting inductive current;
Step 5: use pi regulator regulation inverter subelement both end voltage;
In described step 1, if the phase angle connecting inductive current and AC supply voltage isSpecifically have:
Wherein, iLT () is that t connects inductive current, ILmFor connecting the current peak of inductance;ω is angular velocity;
In described step 2, connect real component and AC supply voltage homophase, its idle component and the alternating voltage of inductive current
Differ 90 degree, then have:
Wherein, ILpAnd ILqIt is respectively real component and the idle component connecting inductive current;
Convolution (1), (2) and (3) can obtain:
iL(t)=ILp sinωt+ILq cosωt (4)
Formula (4) left and right, with being multiplied by cos ω t, can obtain:
From formula (5), by iLT () is multiplied by cos ω t, filter I through low pass filterLpSin2 ω t and ILqCos2 ω t, then take advantage of
With 2, the real component of inductance just can be connected;
In like manner, the idle component of inductance can be connected, specifically have:
Formula (4) left and right, with being multiplied by sin ω t, can obtain:
From formula (6), by iLT () is multiplied by sin ω t, filter I through low pass filterLpCos2 ω t and ILqSin2 ω t, then take advantage of
With 2, the idle component of inductance just can be connected;
In described step 3, it is assumed that it is just that electric current flows through connection inductance direction from bypass contactor to inverter subelement, can obtain:
Wherein, ULAnd UABThe voltage being respectively connection inductance exchanges terminal voltage, U with inverter subelementNFor alternating current power supply
Voltage, L is the inductance value connecting inductance;Can be obtained by formula (7):
UL=ω L × (ILp cosωt-ILq sinωt) (8)
UAB=UN-ωL×(ILp cosωt-ILq sinωt) (9)
In described step 4, the real component reference value and the idle component reference value that connect inductive current are expressed as:
ILpref=Kp1×(Uref-Udc)+Ki1×∫(Uref-Udc)dt (10)
ILqref=Kp2×(Iref-ILq)+Ki2×∫(Iref-ILq)dt (11)
Wherein, ILprefAnd ILqrefIt is respectively real component reference value and idle component reference value, the K connecting inductive currentp1And Kp2
It is the adjustment factor of described pi regulator, UrefAnd UdcIt is respectively inverter subelement DC voltage desired value and measured value, Iref
For connecting the real component desired value of inductive current, Ki1And Ki2It is the integral coefficient of pi regulator;
In described step 5, according to the real component reference value connecting inductive current calculated and idle component reference value, use
Pi regulator regulation inverter subelement both end voltage, thus change the input current of inverter subelement.
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