CN104184357B - A kind of storage battery charge-discharge control system and method - Google Patents

Abstract

The present invention relates to a kind of storage battery charge-discharge control system and method, this includes commutator and load, load two ends are parallel with electric capacity C, commutator series inductance L and resistance Rs, AC DC changer is added between described commutator and load, AC DC changer is the full-bridge circuit that half-bridge is composed in parallel with diode VD by insulated gate bipolar transistor V, and the every quarter-phase circuit of full-bridge circuit includes by insulated gate bipolar transistor V, diode VD, diode VD and inductance L_sTwo boost choppers formed.The DC voltage of this system passes through insulated gate bipolar transistor V Duty ratio control.Adding DC DC changer, applied current feedback technique between control rectifier of the present invention and load, input current follows the tracks of input voltage, so that input current total harmonic content THD is less than 5%, and power factor can bring up to 0.99 or higher.This scheme becomes APFC because applying active device.

Description

A kind of storage battery charge-discharge control system and method

Technical field

The present invention relates to a kind of storage battery charge-discharge control system based on two-way inversion transformation technique, belong to production vehicles test Technical field.

Background technology

Current accumulator charging/discharging system uses industrial computer as controlling hinge, is a kind of centralized management mode, and one Denier industrial computer is out of joint, then the large quantities of accumulator controlled by it are the most all scrapped, and bring the biggest economic loss to producer.

Summary of the invention

In order to overcome the deficiencies in the prior art, the present invention provides a kind of accumulator cell charging and discharging control based on two-way inversion transformation technique System processed, by adding AC-DC converter between commutator and load, solves industrial computer centralized management mode and easily produces The problem that large quantities of accumulator are scrapped, applied current feedback technique, input current follows the tracks of input voltage, so that input electric current is total Harmonic content THD is less than 5%, and power factor can bring up to 0.99 or higher.

The technical scheme is that a kind of storage battery charge-discharge control system, this includes commutator and load, loads two End is parallel with electric capacity C, commutator series inductance L and resistance Rs, adds AC-DC converter, AC-between described commutator and load DC changer is the full-bridge circuit that half-bridge is composed in parallel with diode VD by insulated gate bipolar transistor V, full-bridge circuit every two Circuitry phase includes by insulated gate bipolar transistor V, diode VD, diode VD and inductance L_sTwo the boost chopper electricity formed Road.The DC voltage of this system passes through insulated gate bipolar transistor V Duty ratio control.In every quarter-phase circuit, work as u_s> 0 time, By insulated gate bipolar transistor V₂, diode VD₄, diode VD₁, inductance L_sWith insulated gate bipolar transistor V₃, diode VD₁, diode VD₄, inductance L_sForm two boost choppers；Work as u_s< when 0, by insulated gate bipolar transistor V₁, diode VD₃, diode VD₂, inductance L_sWith insulated gate bipolar transistor V₄, diode VD₂, diode VD₃, inductance L_sForm two to rise Pressure chopper circuit, as insulated gate bipolar transistor V₂During conducting, u_sPass through V₂,VD₄To L_sEnergy storage, works as V₂During shutoff, L_sStore Energy pass through VD₁, VD₄Charge to DC bus capacitor C, separate by two loops of chopper circuit.

A kind of accumulator charging and discharging control method, it is characterised in that the method comprises the following steps: step one, to reversible The voltage equation of three phase static coordinate system $\begin{array}{c}{e}_a=L\frac{{\mathrm{di}}_a}{\mathrm{dt}}+v_a\\ e_b=L\frac{{\mathrm{di}}_b}{\mathrm{dt}}+v_b\\ e_c=L\frac{{\mathrm{di}}_c}{\mathrm{dt}}+v_c\end{array}$ Carry out Clark conversion to obtain $\left[\begin{array}{c}{e}_x\\ e_y\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ \frac{\sqrt{3}}{2}& \sqrt{3}& 0\end{array}\right]\left[\begin{array}{c}{e}_a\\ e_b\\ e_c\end{array}\right],$ Wherein, i_aFor reversible convertor A phase input current, i_bFor reversible convertor B phase Input current, i_cFor reversible convertor C phase input current, v_aFor reversible convertor A phase input voltage, v_bFor reversible convertor B phase Input voltage, for reversible convertor C phase input voltage；Step 2, three-phase mains voltage $\begin{array}{c}{e}_a=E\cos \left(\mathrm{wt}\right)\\ e_b=E\cos (\mathrm{wt}-\frac{2}{3}\mathrm{\&pi;})\\ e_c=E\cos (\mathrm{wt}+\frac{2}{3}\mathrm{\&pi;})\end{array}$ Substitute into Clark conversion obtains input voltage expression formula under x-y static coordinate $\begin{array}{c}{e}_x=E\cos \left(\mathrm{wt}\right)\\ e_y=E\sin \left(\mathrm{wt}\right)\end{array},$ Wherein, e_aFor reversible convertor A Phase input voltage, e_bFor reversible convertor B phase input voltage, e_cFor reversible convertor C phase input voltage, E is power supply phase voltage Peak value, w is the angular frequency of supply voltage；

Step 3, by reversible convertor equation in static x-y coordinate system $\begin{array}{c}{e}_x=L\frac{{\mathrm{di}}_x}{\mathrm{dt}}+v_x\\ e_y=L\frac{{\mathrm{di}}_y}{\mathrm{dt}}+v_y\end{array}$ Static coordinate system In voltage equation be transformed into w angular frequency rotate the biphase synchronous coordinate system of d-q in, use PARK transformation matrix $\left[\begin{array}{c}{e}_d\\ e_q\end{array}\right]=\left[\begin{array}{cc}\cos \left(\mathrm{wt}\right)& \sin \left(\mathrm{wt}\right)\\ -\sin \left(\mathrm{wt}\right)& \cos \left(\mathrm{wt}\right)\end{array}\right]\left[\begin{array}{c}{e}_x\\ e_y\end{array}\right]$ Obtain $\left[\begin{array}{c}{e}_d\\ e_q\end{array}\right]=L\frac{d}{\mathrm{dt}}\left[\begin{array}{c}{i}_d\\ i_q\end{array}\right]+\mathrm{wL}\left[\begin{array}{c}-i_q\\ i_d\end{array}\right]+\left[\begin{array}{c}{v}_d\\ v_q\end{array}\right];$ Step 4, by input voltage expression formula under x-y static coordinate $\begin{array}{c}{e}_x=E\cos \left(\mathrm{wt}\right)\\ e_y=E\sin \left(\mathrm{wt}\right)\end{array}$ Substitute into PARK transformation matrix and obtain input electricity It is pressed in the expression formula synchronized in d-q coordinate system $\begin{array}{c}{e}_d=E\\ e_q=0\end{array};$ Step 5, from $\begin{array}{c}{e}_d=E\\ e_q=0\end{array}$ Can be seen that d axle is useful work amount, q Shaft type idle work amount, if unity power factor to be realized transmission, the reference current of q axleThe active power then inputted is $P=\frac{3}{2}(e_d{i}_d+e_q{i}_q)=\frac{3}{2}{\mathrm{Ei}}_d.$ Pass through $\begin{array}{c}[k_p(I_d^{*}-i_d)+k_i\&Integral;(I_d^{*}-i_d)\mathrm{dt}+L\frac{{\mathrm{di}}_d}{d_t}=0\\ [k_p(I_q^{*}-i_q)+k_i\&Integral;I_q^{*}-i_q)\mathrm{dt}+L\frac{{\mathrm{di}}_q}{d_t}=0\end{array}$ Realize the decoupling control of electric current System.

The present invention has following good effect: adding DC-DC converter between control rectifier of the present invention and load, applied current is anti- Feedback technology, input current tracking input voltage, so that input current total harmonic content THD is less than 5%, and power factor can To bring up to 0.99 or higher.This scheme becomes APFC (APFC) because applying active device.Can obtain To high power factor, THD is little；Can work under wider input voltage range；Volume, weight are little；Output voltage can be protected Hold constant, or be regulated to command value；The PWM rectifier using full-bridge and half-bridge structure can also realize the two-way flow of electric energy.

Accompanying drawing explanation

Fig. 1 is specific embodiment of the invention single phase rectifier circuit schematic diagram；

Fig. 2 is specific embodiment of the invention rectified three-phase circuit schematic diagram；

Fig. 3 be specific embodiment of the invention system model in simulink AC DC part schematic diagram；

Fig. 4 is specific embodiment of the invention system model main control module schematic diagram in simulink；

Detailed description of the invention

Below against accompanying drawing, by the description to embodiment, each component that the detailed description of the invention of the present invention is the most involved Shape, structure, mutual alignment between each several part and annexation, the effect of each several part and operation principle, manufacturing process and Operate with method etc., be described in further detail, to help those skilled in the art to the inventive concept of the present invention, technology Scheme has more complete, accurate and deep understanding.

As it is shown in figure 1, work as u_s> 0 time, by V₂,VD₄,VD₁,L_sAnd V₃,VD₁,VD₄,L_sTwo boost choppers are separately constituted Circuit.To comprise V₂Boost chopper as a example by, work as V₂During conducting, u_sPass through V₂,VD₄To L_sEnergy storage, works as V₂During shutoff, L_sStorage The energy deposited passes through VD₁, VD₄Charge to DC bus capacitor C.By V₃The chopper circuit constituted also can be analyzed by same mode, and two Individual loop operating alone, can regard shunt circuit as.

Work as u_s< when 0, by V₁,VD₃,VD₂,L_sAnd V₄,VD₂,VD₃,L_sSeparately constitute two boost choppers, worked former Reason and u_s> 0 time similar.

Circuit presses boost chopper work from the above analysis, and the voltage of DC side is can be by IGBT dutycycle control System.

As in figure 2 it is shown, the operation principle of rectified three-phase circuit is similar with single-phase full bridge circuit, as long as we are every two suitable Becoming a loop line voltage analysis, such situation is just and single-phase just the same.So the voltage of DC side also can be by The Duty ratio control of IGBT.

The most at a time V₃Conducting is (with V₃Relevant has AB phase and BC phase), if at this moment the line voltage of AB phase is just Half cycle then alternating current power supply passes through V₃,VD₁To L_s(including A phase and the inductance of B phase) energy storage, V₃L during shutoff_sThe energy stored passes through VD₁, VD₆Charge to DC bus capacitor C, if at negative half period AB phase line current, depending on V₁And V₆Depending on break-make situation.The line of BC phase Voltage line current of BC phase when positive half cycle then regards V₅And V₄Depending on break-make situation, if the line voltage of BC phase is at negative half period, hand over Stream power supply passes through V₃,VD₅To L_s(including B phase and the inductance of C phase) energy storage, V₃L during shutoff_sThe energy stored passes through VD₅, VD₆To DC bus capacitor C charges.

If the three-phase mains voltage of input is

$\begin{array}{c}{e}_a=E\cos \left(\mathrm{wt}\right)\\ e_b=E\cos (\mathrm{wt}-\frac{2}{3}\mathrm{\&pi;})\\ e_c=E\cos (\mathrm{wt}+\frac{2}{3}\mathrm{\&pi;})\end{array}---\left(1\right)$

E in formula_a--reversible convertor A phase input voltage；e_b--reversible convertor B phase input voltage

e_c--reversible convertor C phase input voltage；The peak value of E power supply phase voltage

The angular frequency of w supply voltage；

The voltage equation of reversible three phase static coordinate system

$\begin{array}{c}{e}_a=L\frac{{\mathrm{di}}_a}{\mathrm{dt}}+v_a\\ e_b=L\frac{{\mathrm{di}}_b}{\mathrm{dt}}+v_b\\ e_c=L\frac{{\mathrm{di}}_c}{\mathrm{dt}}+v_c\end{array}---\left(2\right)$

I in formula_a---reversible convertor A phase input current；i_b---reversible convertor B phase input current

i_c---reversible convertor C phase input current；v_a---reversible convertor A phase input voltage

v_b---reversible convertor B phase input voltage；v_c---reversible convertor C phase input voltage

Three phase static voltage equation is converted through Clark

$\left[\begin{array}{c}{e}_x\\ e_y\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}1& -\frac{1}{2}& -\frac{1}{2}\\ \frac{\sqrt{3}}{2}& \sqrt{3}& 0\end{array}\right]\left[\begin{array}{c}{e}_a\\ e_b\\ e_c\end{array}\right]---\left(3\right)$

Then reversible convertor equation in static x-y coordinate system is:

$\begin{array}{c}{e}_x=L\frac{{\mathrm{di}}_x}{\mathrm{dt}}+v_x\\ e_y=L\frac{{\mathrm{di}}_y}{\mathrm{dt}}+v_y\end{array}---\left(4\right)$

Voltage equation in static coordinate system in (4) formula is now transformed into d-q two synchronised rotated with w angular frequency sit In mark system, employing PARK transformation matrix:

$\left[\begin{array}{c}{e}_d\\ e_q\end{array}\right]=\left[\begin{array}{cc}\cos \left(\mathrm{wt}\right)& \sin \left(\mathrm{wt}\right)\\ -\sin \left(\mathrm{wt}\right)& \cos \left(\mathrm{wt}\right)\end{array}\right]\left[\begin{array}{c}{e}_x\\ e_y\end{array}\right]---\left(5\right)$

(4) formula is substituted into (5) Shi Ke get

$\left[\begin{array}{c}{e}_d\\ e_q\end{array}\right]=L\frac{d}{\mathrm{dt}}\left[\begin{array}{c}{i}_d\\ i_q\end{array}\right]+\mathrm{wL}\left[\begin{array}{c}-i_q\\ i_d\end{array}\right]+\left[\begin{array}{c}{v}_d\\ v_q\end{array}\right]---\left(6\right)$

(1) formula substitution (3) formula can be obtained input voltage expression formula under x-y static coordinate

$\begin{array}{c}{e}_x=E\cos \left(\mathrm{wt}\right)\\ e_y=E\sin \left(\mathrm{wt}\right)\end{array}---\left(7\right)$

Formula (7) is substituted into formula (5) input voltage expression formula in synchronizing d-q coordinate system can be obtained

$\begin{array}{c}{e}_d=E\\ e_q=0\end{array}---\left(8\right)$

It is updated to formula (8) in formula (6) to obtain

$\begin{array}{c}E=L\frac{{\mathrm{di}}_d}{\mathrm{dt}}-w{\mathrm{Li}}_q+v_d\\ 0=L\frac{{\mathrm{di}}_q}{\mathrm{dt}}+w{\mathrm{Li}}_d+v_q\end{array}---\left(9\right)$

Can be seen that from (8) formula d axle is useful work amount, q shaft type idle work amount, so unity power factor to be realized passes Pass, it is desirable to the reference current of q axleThe active power then inputted is

$P=\frac{3}{2}(e_d{i}_d+e_q{i}_q)=\frac{3}{2}{\mathrm{Ei}}_d---\left(10\right)$

Visible input active power is directly proportional to d shaft current.The reference current of d axleIt is can be by the electricity of DC side Pressure actuator output obtains.

From (9) formula it is also seen that this is a coupled system, i.e. the electric current of d axle is had an impact by the curent change of q axle, with Q axle is also had an impact by the change of the electric current of sample d axle, so wanting reality to need to realize uneoupled control to the control of electric current.

In order to realize the uneoupled control of electric current, using following control program, voltage gives instruction and is

$\begin{array}{c}{V}_d^{*}=E_d+\mathrm{wL}{I}_q-[k_p(I_d^{*}-i_d)+k_i\&Integral;(I_d^{*}-i_d)\mathrm{dt}\\ V_q^{*}=E_q-\mathrm{wL}{I}_d-[k_p(I_q^{*}-i_q)+k_i\&Integral;I_q^{*}-i_q)\mathrm{dt}\end{array}---\left(11\right)$

(11) formula is substituted in (6) formula and can obtain

$\begin{array}{c}[k_p(I_d^{*}-i_d)+k_i\&Integral;(I_d^{*}-i_d)\mathrm{dt}+L\frac{{\mathrm{di}}_d}{d_t}=0\\ [k_p(I_q^{*}-i_q)+k_i\&Integral;I_q^{*}-i_q)\mathrm{dt}+L\frac{{\mathrm{di}}_q}{d_t}=0\end{array}---\left(12\right)$

The decoupling of electric current is achieved seen from above formula.

Fig. 3 middle controller has been sampled DC voltage, the voltage x current of three-phase alternating current side.

Direct current gives voltage Udc^*=650V, the supply voltage of DC side is zero, by net side ABC phase voltage current simulations Waveform can be seen that voltage is finally stable at given 650V.DC side gives voltage Udc^*=650V, the supply voltage of DC side For 800V, by net side A phase voltage current simulations waveform, circuit works in inverter mode, and DC voltage still maintains 650V.

PWM rectifier net side presents the characteristic of current source, thus this characteristic makes PWM rectifier and control technology thereof obtain Further develop and widen, and achieve and be more widely applied, such as static reactive (SVG), active power filtering (APF), Unified Power Flow controls (UPFC), superconducting energy storage (SMES), D.C. high voltage transmission (HVDC), electrical equipment transmission (ED), novel Generating electricity by way of merging two or more grid systems of UPS and the regenerative resource such as solar energy, wind energy.

Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements not by aforesaid way Restriction, as long as have employed the method design of the present invention and the improvement of various unsubstantialities that technical scheme is carried out, or without changing Enter and design and the technical scheme of the present invention are directly applied to other occasion, all within protection scope of the present invention.

Claims (2)

1. an accumulator charging and discharging control method, the method is based on a kind of storage battery charge-discharge control system, and this system includes Commutator and load, load two ends are parallel with electric capacity C, commutator series inductance L and resistance Rs, between described commutator and load Adding AC-DC converter, AC-DC converter is that half-bridge is complete with what diode VD composed in parallel by insulated gate bipolar transistor V Bridge circuit, the every quarter-phase circuit of full-bridge circuit includes by insulated gate bipolar transistor V, diode VD, diode VD and inductance L_s Two boost choppers formed；The DC voltage of this system passes through insulated gate bipolar transistor V Duty ratio control；Often In quarter-phase circuit, work as u_s> 0 time, by insulated gate bipolar transistor V₂, diode VD₄, diode VD₁, inductance L_sDouble with insulated gate Bipolar transistor V₃, diode VD₁, diode VD₄, inductance L_sForm two boost choppers；Work as u_s< when 0, double by insulated gate Bipolar transistor V₁, diode VD₃, diode VD₂, inductance L_sWith insulated gate bipolar transistor V₄, diode VD₂, diode VD₃, inductance L_sForm two boost choppers, as insulated gate bipolar transistor V₂During conducting, u_sPass through V₂,VD₄To L_sStorage Can, work as V₂During shutoff, L_sThe energy stored passes through VD₁, VD₄Charge to DC bus capacitor C, mutual by two loops of chopper circuit Independent；It is characterized in that, the method comprises the following steps:

Step one, voltage equation to reversible three phase static coordinate systemCarry out Clark conversion to obtainWherein, i_aFor reversible convertor A phase input current, i_bFor reversible convertor B phase Input current, i_cFor reversible convertor C phase input current, v_aFor reversible convertor A phase input voltage, v_bFor reversible convertor B phase Input voltage, v_cFor reversible convertor C phase input voltage, L is commutator series inductance constant；

Step 2, three-phase mains voltageSubstitute into Clark conversion and obtain input voltage in x-y static state Expression formula under coordinateWherein, e_aFor reversible convertor A phase input voltage, e_bDefeated for reversible convertor B phase Enter voltage, e_cFor reversible convertor C phase input voltage, E is the peak value of power supply phase voltage, and w is the angular frequency of supply voltage；

Step 3, by reversible convertor equation in static x-y coordinate systemStatic coordinate system in electricity Pressure equation is transformed in the biphase synchronous coordinate system of d-q with the rotation of w angular frequency, uses PARK transformation matrixObtain

Step 4, by input voltage expression formula under x-y static coordinateSubstitute into PARK transformation matrix to be inputted Voltage expression formula in synchronizing d-q coordinate system

Step 5, fromCan be seen that d axle is useful work amount, q shaft type idle work amount, if unit power to be realized because of Number transmission, the reference current of q axleThe active power then inputted is

Accumulator charging and discharging control method the most according to claim 1, it is characterised in that: pass throughRealize the uneoupled control of electric current.