CN104007398B - A kind of inverter subelement full working scope closed loop control test method - Google Patents

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

A kind of inverter subelement full working scope closed loop control test method

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, i_LT () is that t connects inductive current, I_LmFor 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, I_LpAnd I_LqIt is respectively real component and the idle component connecting inductive current；

Convolution (1), (2) and (3) can obtain:

i_L(t)=I_Lpsinωt+I_Lqcosωt (4)

Formula (4) left and right, with being multiplied by cos ω t, can obtain:

$i_L\left(t\right)\cos \mathrm{\ωt}=I_{\mathrm{Lp}}\sin \mathrm{\ω}t\cos \mathrm{\ωt}+I_{\mathrm{Lq}}\cos \mathrm{\ω}t\cos \mathrm{\ωt}=\frac{1}{2}(I_{\mathrm{Lp}}\sin 2\mathrm{\ω}+I_{\mathrm{Lq}}\cos 2\mathrm{\ωt})+\frac{I_{\mathrm{Lq}}}{2}---\left(5\right)$

From formula (5), by i_LT () is multiplied by cos ω t, filter I through low pass filter_LpSin2 ω t and I_LqCos2 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:

$i_L\left(t\right)\sin \mathrm{\ωt}=I_{\mathrm{Lp}}\sin \mathrm{\ω}t\sin \mathrm{\ωt}+I_{\mathrm{Lq}}\cos \mathrm{\ω}t\sin \mathrm{\ωt}=\frac{1}{2}(-I_{\mathrm{Lp}}\cos 2\mathrm{\ωt}+I_{\mathrm{Lq}}\sin 2\mathrm{\ωt})+\frac{I_{\mathrm{Lp}}}{2}---\left(6\right)$

From formula (6), by i_LT () is multiplied by sin ω t, filter I through low pass filter_LpCos2 ω t and I_LqSin2 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:

$\left\{\begin{array}{c}{U}_{\mathrm{AB}}=U_N-U_L\\ U_L=L\frac{{\mathrm{di}}_L\left(t\right)}{\mathrm{dt}}\\ i_L\left(t\right)=I_{\mathrm{Lp}}\sin \mathrm{\ωt}+I_{\mathrm{Lq}}\cos \mathrm{\ωt}\end{array}\right.---\left(7\right)$

Wherein, U_LAnd U_ABThe voltage being respectively connection inductance exchanges terminal voltage, U with inverter subelement_NFor alternating current power supply Voltage, L is the inductance value connecting inductance；Can be obtained by formula (7):

U_L=ω L × (I_Lpcosωt-I_Lqsinωt) (8)

U_AB=U_N-ωL×(I_Lpcosωt-I_Lqsinωt) (9)。

In described step 4, the real component reference value and the idle component reference value that connect inductive current are expressed as:

I_Lpref=K_p1×(U_ref-U_dc)+K_i1×∫(U_ref-U_dc)dt (10)

I_Lqref=K_p2×(I_ref-I_Lq)+K_i2×∫(I_ref-I_Lq)dt (11)

Wherein, I_LprefAnd I_LqrefIt is respectively real component reference value and idle component reference value, the K connecting inductive current_p1And K_p2 It is the adjustment factor of described pi regulator, U_refAnd U_dcIt is respectively inverter subelement DC voltage desired value and measured value, I_ref For connecting the real component desired value of inductive current, K_i1And K_i2It 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, U_NFor supply voltage, U_ABFor inverter Unit exchange terminal voltage, for connecting inductive drop U_L, dead resistance, for convenience of analyzing, is ignored, is had U_N=U_L+U_AB。 By regulation inverter subelement both end voltage U_AB, voltage on inductance can be changed, thus change module input current I_L。

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 U_AB, 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, i_LT () is that t connects inductive current, I_LmFor 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, I_LpAnd I_LqIt is respectively real component and the idle component connecting inductive current；

Convolution (1), (2) and (3) can obtain:

i_L(t)=I_Lpsinωt+I_Lqcosωt (4)

Formula (4) left and right, with being multiplied by cos ω t, can obtain:

$i_L\left(t\right)\cos \mathrm{\ωt}=I_{\mathrm{Lp}}\sin \mathrm{\ω}t\cos \mathrm{\ωt}+I_{\mathrm{Lq}}\cos \mathrm{\ω}t\cos \mathrm{\ωt}=\frac{1}{2}(I_{\mathrm{Lp}}\sin 2\mathrm{\ω}+I_{\mathrm{Lq}}\cos 2\mathrm{\ωt})+\frac{I_{\mathrm{Lq}}}{2}---\left(5\right)$

From formula (5), by i_LT () is multiplied by cos ω t, filter I through low pass filter_LpSin2 ω t and I_LqCos2 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:

$i_L\left(t\right)\sin \mathrm{\ωt}=I_{\mathrm{Lp}}\sin \mathrm{\ω}t\sin \mathrm{\ωt}+I_{\mathrm{Lq}}\cos \mathrm{\ω}t\sin \mathrm{\ωt}=\frac{1}{2}(-I_{\mathrm{Lp}}\cos 2\mathrm{\ωt}+I_{\mathrm{Lq}}\sin 2\mathrm{\ωt})+\frac{I_{\mathrm{Lp}}}{2}---\left(6\right)$

From formula (6), by i_LT () is multiplied by sin ω t, filter I through low pass filter_LpCos2 ω t and I_LqSin2 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:

$\left\{\begin{array}{c}{U}_{\mathrm{AB}}=U_N-U_L\\ U_L=L\frac{{\mathrm{di}}_L\left(t\right)}{\mathrm{dt}}\\ i_L\left(t\right)=I_{\mathrm{Lp}}\sin \mathrm{\ωt}+I_{\mathrm{Lq}}\cos \mathrm{\ωt}\end{array}\right.---\left(7\right)$

Wherein, U_LAnd U_ABThe voltage being respectively connection inductance exchanges terminal voltage, U with inverter subelement_NFor alternating current power supply Voltage, L is the inductance value connecting inductance；Can be obtained by formula (7):

U_L=ω L × (I_Lpcosωt-I_Lqsinωt) (8)

U_AB=U_N-ωL×(I_Lpcosωt-I_Lqsinωt) (9)。

In described step 4, the real component reference value and the idle component reference value that connect inductive current are expressed as:

I_Lpref=K_p1×(U_ref-U_dc)+K_i1×∫(U_ref-U_dc)dt (10)

I_Lqref=K_p2×(I_ref-I_Lq)+K_i2×∫(I_ref-I_Lq)dt (11)

Wherein, I_LprefAnd I_LqrefIt is respectively real component reference value and idle component reference value, the K connecting inductive current_p1And K_p2 It is the adjustment factor of described pi regulator, U_refAnd U_dcIt is respectively inverter subelement DC voltage desired value and measured value, I_ref For connecting the real component desired value of inductive current, K_i1And K_i2It 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, i_LT () is that t connects inductive current, I_LmFor 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, I_LpAnd I_LqIt is respectively real component and the idle component connecting inductive current；

Convolution (1), (2) and (3) can obtain:

i_L(t)=I_Lp sinωt+I_Lq cosωt (4)

Formula (4) left and right, with being multiplied by cos ω t, can obtain:

$i_L\left(t\right)cos\mathrm{\ω}t=I_{Lp}sin\mathrm{\ω}tcos\mathrm{\ω}t+I_{Lq}cos\mathrm{\ω}tcos\mathrm{\ω}t=\frac{1}{2}(I_{Lp}sin2\mathrm{\ω}t+I_{Lq}cos2\mathrm{\ω}t)+\frac{I_{Lq}}{2}---\left(5\right)$

From formula (5), by i_LT () is multiplied by cos ω t, filter I through low pass filter_LpSin2 ω t and I_LqCos2 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:

$i_L\left(t\right)sin\mathrm{\ω}t=I_{Lp}sin\mathrm{\ω}tsin\mathrm{\ω}t+I_{Lq}cos\mathrm{\ω}tsin\mathrm{\ω}t=\frac{1}{2}(-I_{Lp}cos2\mathrm{\ω}t+I_{Lq}sin2\mathrm{\ω}t)+\frac{I_{Lp}}{2}---\left(6\right)$

From formula (6), by i_LT () is multiplied by sin ω t, filter I through low pass filter_LpCos2 ω t and I_LqSin2 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:

$\left\{\begin{array}{c}{U}_{AB}=U_N-U_L\\ U_L=L\frac{{\mathrm{di}}_L\left(t\right)}{dt}\\ i_L\left(t\right)=I_{Lp}sin\mathrm{\ω}t+I_{Lq}cos\mathrm{\ω}t\end{array}\right.---\left(7\right)$

Wherein, U_LAnd U_ABThe voltage being respectively connection inductance exchanges terminal voltage, U with inverter subelement_NFor alternating current power supply Voltage, L is the inductance value connecting inductance；Can be obtained by formula (7):

U_L=ω L × (I_Lp cosωt-I_Lq sinωt) (8)

U_AB=U_N-ωL×(I_Lp cosωt-I_Lq sinωt) (9)

In described step 4, the real component reference value and the idle component reference value that connect inductive current are expressed as:

I_Lpref=K_p1×(U_ref-U_dc)+K_i1×∫(U_ref-U_dc)dt (10)

I_Lqref=K_p2×(I_ref-I_Lq)+K_i2×∫(I_ref-I_Lq)dt (11)

Wherein, I_LprefAnd I_LqrefIt is respectively real component reference value and idle component reference value, the K connecting inductive current_p1And K_p2 It is the adjustment factor of described pi regulator, U_refAnd U_dcIt is respectively inverter subelement DC voltage desired value and measured value, I_ref For connecting the real component desired value of inductive current, K_i1And K_i2It 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.