CN105281365A - Diesel-storage type military alternating current mobile power station and power quality control method therefor - Google Patents

Abstract

The invention discloses a diesel-storage type military alternating current mobile power station and a power quality control method therefor. The novel power station comprises the main parts of a diesel generating set, a lithium battery, a superconductor, a three-phase controllable rectifier, a bidirectional DC-DC convertor, a three-phase controllable inverter and the like, and the main parts are integrated into a military standard square compartment. By improving and controlling the three-phase controllable rectifier and the bidirectional DC-DC convertor, the power station allows a fluctuation of the direct current bus voltage to be within a certain range; according to the design, the high-power density characteristic of the superconductive is given full play, meanwhile, the charging and discharging frequency of the lithium battery is reduced, and the service life of the equipment is prolonged; and in addition, through the optimized design for the control policy of the three-phase controllable inverter, the effective treatment on the power grid harmonic pollution is realized, and the power output quality of the military alternating current mobile power station is improved.

Description

A kind of military interchange mobile power station of bavin storage type and electric energy quality control method thereof

Technical field

The present invention relates to a kind of mobile power station, particularly relate to a kind of military interchange mobile power station higher to power supply quality requirement and electric energy quality control method thereof.

Background technology

Military interchange mobile power station has extensive use in military field, mainly in order to the electric power safeguard task of the arm of the services equipments such as the radar operator that carries out, signal corps, artilleryman.According to the relevant requirements of national standard GJB235A-97 " military interchange mobile power station system specification ", rated power is that the aberration rate when unloaded rated voltage of the military interchange mobile power station of 3 ~ 250kW should be not more than 10% or 5%.In recent years, along with coming into operation of the large-scale army electrical installations such as pulse radar, traditional diesel generating set is the high-quality need for electricity that main automobile power station can not meet communication, measuring and controlling equipment, is mainly reflected in the following aspects:

First, dynamic load capacity is not strong.See in essence, military interchange mobile power station based on oil machine is typical micronetwork, comparatively obvious by bearing power influence of fluctuations, and impact, prominent the unloading of large power-consuming equipment easily cause power network fluctuation, involve the security of operation of other loads in system, even cause system unstability to be paralysed.

Secondly, the problem of " low load with strong power " is more outstanding.My army's observing and controlling at present, the load of communication equipment multidigit pulse power, its instantaneous power is often average power more than 2 times.Owing to not possessing buffering link, existing military interchange mobile power station, usually using instantaneous power as design considerations, causes the volume weight of oil machine significantly to increase.

Again, electric power quality is exported poor.The military interchange mobile power station of tradition can only be revised the amplitude of output voltage, phase place by adjustment exciting current, but the typical fault such as Voltage unbalance, harmonic distortion caused for load is then helpless.Above-mentioned typical electric network fault, if do not administered, will cause severe jamming to the normal work of sensitive equipment in system, even cause device damage.

Therefore, develop a kind of New Type Military interchange mobile power station with Power quality management function and just seem particularly important and urgent.

Summary of the invention

The object of the invention is for the deficiencies in the prior art, the military interchange mobile power station of a kind of bavin storage type and electric energy quality control method thereof are provided, meet military communications equipment, measuring and controlling equipment to the high-quality power demands exchanging mobile power station.

The object of the invention is to be achieved through the following technical solutions: a kind of bavin storage type military interchange mobile power station mainly comprises following building block: the controlled inverter of diesel generating set, lithium battery, super capacitor, three-phase controlled rectifier, bidirectional DC-DC converter and three-phase; Above-mentioned each building block is integrated within a military standard shelter, and between each parts, there is following electric connecting relation: the three-phase alternating current output of diesel generating set, be connected to the input of three-phase controlled rectifier, the output of three-phase controlled rectifier is parallel on DC bus; The output of lithium battery, is connected to the input (low-pressure end) of bidirectional DC-DC converter, and the output (high-pressure side) of bidirectional DC-DC converter is parallel on DC bus; Super capacitor is directly parallel on DC bus; The input of the controlled inverter of three-phase is connected on DC bus, and the output of the controlled inverter of three-phase is connected to power consumption equipment (load).The electric energy quality control method of the military interchange mobile power station of a kind of bavin storage type of the present invention mainly comprises the following steps:

1. utilize transducer to gather following signal: the pusher side three-phase alternating voltage U that diesel generating set exports _gabcwith pusher side three-phase alternating current I _gabc, output current (or discharging current of the lithium battery) I of lithium battery _dc, DC bus-bar voltage U _dc, the net side three-phase alternating voltage u that the controlled inverter of three-phase exports _nabc, DC side load current I _load;

2. the effect of bidirectional DC-DC converter is the electric energy charge and discharge controlling lithium battery, maintains the stable of busbar voltage; According to the state-of-charge Soc of lithium battery, the control model of bidirectional DC-DC converter is divided into Boost, Buck two kinds, is specially:

The 2.1 state-of-charge Soc working as lithium battery are greater than setting threshold Soc _mintime, bidirectional DC-DC converter switches to Boost pattern; Otherwise, when Soc is less than or equal to setting threshold Soc _mintime, bidirectional DC-DC converter switches to Buck pattern;

Under 2.2Boost pattern, as DC bus-bar voltage U _dcamplitude lower than set threshold voltage U _dcmintime, DC bus-bar voltage instruction with DC bus-bar voltage U _dcdifference DELTA U _dcsend into Voltage loop proportional integral (PI) controller, obtain lower power tube modulation voltage U _d, by U _dsend into PWM module, the lower power tube T of bidirectional DC-DC converter can be produced ₂triggering signal S _d; Otherwise DC bus-bar voltage U _dcamplitude higher than equaling set threshold voltage U _dcmintime, lower power tube T ₂triggering signal S _dbe set to zero; Under Boost pattern, the upper power tube T of bidirectional DC-DC converter ₁triggering signal be set to zero all the time, namely go up power tube T ₁be in blocking;

Under 2.3Buck pattern, the current-order of lithium battery with the output current I of lithium battery _dcdifference DELTA I _dcsend into electric current loop proportional integral (PI) controller, obtain power tube modulation voltage U ' _d; By U ' _dsend into the PWM module identical with step 2.2, power tube T can be produced ₁triggering signal S ' _d; Under Buck pattern, lower power tube T ₂triggering signal be always zero, namely descend power tube T ₂be in blocking;

3. the effect of three-phase controlled rectifier converts the output voltage of diesel generating set to direct current by interchange, and it controls to adopt the direct Power Control method based on space vector modulation, is specially:

The pusher side three-phase alternating voltage U that 3.1 diesel generating sets export _gabcfirst sending into traditional digital phase-locked loop PLL carries out phase-locked, obtains the angular position theta of pusher side three-phase alternating voltage _g, angular frequency _gwith amplitude U _g;

The pusher side three-phase alternating voltage U that 3.2 diesel generating sets export _gabc, pusher side three-phase alternating current I _gabcsend into power computation module, obtain the active power of output P of diesel generating set _g, output reactive power Q _g;

The active power instruction of 3.3 diesel generating sets reactive power instruction active power of output P corresponding with it respectively _g, output reactive power Q _gdiffer from, its difference DELTA P _g, Δ Q _gsend into power ring proportional integral (PI) controller respectively, obtain the active voltage instruction V of three-phase controlled rectifier _gdwith reactive voltage instruction V _gq; Wherein, the active power instruction of diesel generating set reactive power instruction accounting equation is:

$\left\{\begin{array}{c}{P}_g^{*}=U_{dc}\·I_{load}\\ Q_g^{*}=0\end{array}\right.;$

The active voltage instruction V of the three-phase controlled rectifier that 3.4 steps 3.3 obtain _gd, reactive voltage instruction V _gqadd respective compensation term respectively, obtain the real power control voltage U of three-phase controlled rectifier _cd, idle control voltage U _cq; Concrete accounting equation is:

$\left\{\begin{array}{c}{U}_{cd}=-V_{gd}+(U_g-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{Q}_g)\\ U_{cq}=V_{gq}-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{P}_g\end{array}\right.;$

In formula: L _gfor the filter inductance of three-phase controlled rectifier;

The angular position theta of the 3.5 pusher side three-phase alternating voltages utilizing step 3.1 to obtain _gto the real power control voltage U that step 3.4 obtains _cd, idle control voltage U _cqcarry out Park inverse transformation, obtain the meritorious regulation voltage U under rest frame _{c α}, Reactive-power control voltage U _{c β};

Park inverse transformation process can be expressed as:

$\left[\begin{array}{c}{U}_{c\mathrm{\α}}\\ U_{c\mathrm{\β}}\end{array}\right]=\left[\begin{array}{cc}{\mathrm{cos\θ}}_g& {\mathrm{sin\θ}}_g\\ -{\mathrm{sin\θ}}_g& {\mathrm{cos\θ}}_g\end{array}\right]\left[\begin{array}{c}{U}_{cd}\\ U_{cq}\end{array}\right];$

Meritorious regulation voltage U under 3.6 rest frames that step 3.5 is obtained _{c α}, Reactive-power control voltage U _{c β}carry out space vector modulation (SVM), the switching signal s of three-phase controlled rectifier can be obtained _a, s _b, s _c, realize the effective control to three-phase controlled rectifier;

4. the effect of the controlled inverter of three-phase is the three-phase alternating current be converted to by direct current needed for load, and administers harmonic pollution in electric power net, and its control method is:

The three-phase voltage instruction of the controlled inverter of 4.1 generation three-phase be specially:

$\left\{\begin{array}{c}{u}_{na}^{*}=M\·sin({\mathrm{\ω}}_g\×t+{\mathrm{\ω}}_0)\\ u_{nb}^{*}=M\·sin({\mathrm{\ω}}_g\×t+{\mathrm{\ω}}_0-2\mathrm{\π}/3)\\ u_{nc}^{*}=M\·sin({\mathrm{\ω}}_g\×t+{\mathrm{\ω}}_0+2\mathrm{\π}/3)\end{array}\right.;$

In formula: M is the amplitude of phase voltage, and has ω ₀for the starting phase angle of three-phase voltage, generally can zero be set to, i.e. ω ₀=0; be respectively a phase, B phase, C phase component;

4.2 with reference to step 3.1, three-phase voltage instruction step 4.1 generated send into traditional digital phase-locked loop PLL, obtain the output voltage angular position theta of the controlled inverter of three-phase _n;

The 4.3 output voltage angular position thetas utilizing step 4.2 to obtain _nrespectively to three-phase voltage instruction with net side three-phase alternating voltage u _nabccarry out Park conversion, obtain the voltage on line side instruction of the controlled inverter of three-phase with voltage on line side vector u _ndq;

With to three-phase voltage instruction park be transformed to example, its matrix equation can be expressed as:

$\left[\begin{array}{c}{u}_{nd}^{*}\\ u_{nq}^{*}\end{array}\right]=\frac{2}{3}\left[\begin{array}{ccc}{\mathrm{cos\θ}}_n& cos({\mathrm{\θ}}_n-\frac{2\mathrm{\π}}{3})& cos({\mathrm{\θ}}_n+\frac{2\mathrm{\π}}{3})\\ -{\mathrm{sin\θ}}_n& -\sin ({\mathrm{\θ}}_n-\frac{2\mathrm{\π}}{3})& -sin({\mathrm{\θ}}_n+\frac{2\mathrm{\π}}{3})\end{array}\right]\left[\begin{array}{c}{u}_{na}^{*}\\ u_{nb}^{*}\\ u_{nc}^{*}\end{array}\right];$

In formula: be respectively d axle, q axle component.

The voltage on line side instruction of the controlled inverter of 4.4 three-phase that step 4.3 is obtained with voltage on line side vector u _ndqdifference DELTA u _ndqsend into Voltage loop proportional integral-resonance (PI-R) controller, obtain the control voltage v of the controlled inverter of three-phase _cdq; Wherein, the transfer function of proportional integral-resonance (PI-R) controller under s territory is:

$G_R\left(s\right)=K_p+\frac{K_i}{s}+\frac{K_{r}s}{s^2+2{\mathrm{\ω}}_{c}s+{\left(6{\mathrm{\ω}}_g\right)}^2};$

In formula: K _p, K _i, K _rbe respectively the proportionality coefficient of PI-R controller, integral coefficient and resonance coefficient; ω _cfor the cut-off frequency of resonant controller, in order to increase the responsive bandwidth of resonant controller, reduce its sensitivity to resonance point frequency fluctuation;

4.5 with reference to step 3.5, the output voltage angular position theta utilizing step 4.2 to obtain _nthe control voltage v of the controlled inverter of the three-phase that step 4.4 is obtained _cdqmake Park inverse transformation, the modulation voltage u of the controlled inverter of three-phase under acquisition rest frame _{c α β};

4.6 with reference to step 3.6, the modulation voltage u of the controlled inverter of three-phase step 4.5 obtained _{c α β}send into space vector modulation (SVM) module, the switching signal s of the controlled inverter of three-phase can be produced ₁, s ₂, s ₃, realize controlling the expection of the controlled inverter of three-phase.

Above-mentioned steps 1 ~ 4 together constitutes the electric energy quality control method of the military interchange mobile power station of bavin storage type of the present invention.

Compared with prior art, the beneficial effect that the present invention has is:

1) composite energy storing device of lithium battery, super capacitor and bidirectional DC-DC converter composition is adopted, effectively can cushion pulse or step power load to the impact of electrical network, and can realize, to the accurate control of charging and discharging lithium battery electric current, extending the useful life of equipment;

2) under Boost pattern, the control of bidirectional DC-DC converter adds a DC bus-bar voltage amplitude and judges link (or Hysteresis control), busbar voltage is allowed to fluctuate within the specific limits, this design had both played the high power density characteristic of super capacitor, again reduced the frequency of charging and discharging lithium battery;

3) by the improvement to the controlled inverter control method of three-phase, achieve and the active of harmonic pollution in electric power net is administered, improve the electric energy output quality of military interchange mobile power station.

Accompanying drawing explanation

Fig. 1 is topological structure and the signals collecting figure of the military interchange mobile power station of bavin storage type of the present invention;

Fig. 2 is the bidirectional DC-DC converter circuit structure diagram of the military interchange mobile power station of bavin storage type of the present invention;

Fig. 3 is the bidirectional DC-DC converter control principle drawing of the military interchange mobile power station of bavin storage type of the present invention;

Fig. 4 is the three-phase controlled rectifier control principle drawing of the military interchange mobile power station of bavin storage type of the present invention;

Fig. 5 is the controlled inverter control schematic diagram of three-phase of bavin storage type of the present invention military interchange mobile power station;

Simulation run result when Fig. 6 is bavin storage type of the present invention military interchange mobile power station access pulse power load;

Simulation run result when Fig. 7 is bavin storage type of the present invention military interchange mobile power station access nonlinear load;

In figure, the controlled inverter 6 of diesel generating set 1, lithium battery 2, super capacitor 3, three-phase controlled rectifier 4, bidirectional DC-DC converter 5 and three-phase.

Embodiment

Below in conjunction with accompanying drawing and case study on implementation, the invention will be further described.

Fig. 1 is bavin storage type military interchange mobile power station topological structure of the present invention and signals collecting figure.A kind of bavin storage type military interchange mobile power station described in the invention mainly comprises following building block: the controlled inverter 6 of diesel generating set 1, lithium battery 2, super capacitor 3, three-phase controlled rectifier 4, bidirectional DC-DC converter 5 and three-phase; Wherein, lithium battery 2, super capacitor 3 and bidirectional DC-DC converter 5 form composite energy storing device of the present invention jointly.Above-mentioned each building block is integrated within a military standard shelter, and has following electric connecting relation between each parts:

The three-phase alternating current output of diesel generating set 1, is connected to the input of three-phase controlled rectifier 4, and the output of three-phase controlled rectifier 4 is parallel on DC bus; The output of lithium battery 2, is connected to the input (low-pressure end) of bidirectional DC-DC converter 5, and the output (high-pressure side) of bidirectional DC-DC converter 5 is parallel on DC bus; Super capacitor 3 is directly parallel on DC bus; The input of the controlled inverter 6 of three-phase is connected on DC bus, and the output of the controlled inverter 6 of three-phase is connected to power consumption equipment (load).

As shown in Figure 1, the military interchange mobile power station of a kind of bavin storage type described in the invention and electric energy quality control method thereof, need utilize the signal of transducer collection to have: the pusher side three-phase alternating voltage U that diesel generating set exports _gabcwith pusher side three-phase alternating current I _gabc, output current (or discharging current of the lithium battery) I of lithium battery _dc, DC bus-bar voltage U _dc, the net side three-phase alternating voltage u that the controlled inverter of three-phase exports _nabc, DC side load current I _load.

Fig. 2 is the bidirectional DC-DC converter circuit structure diagram of the military interchange mobile power station of bavin storage type of the present invention, in figure: T ₁and T ₂for power tube (definition of T here ₁for upper power tube, T ₂for lower power tube); L ₁for energy storage inductor, play and store stream effect; C ₁and C ₂for Support Capacitor (defines C here ₁for high-pressure side Support Capacitor, C ₂for low-pressure end Support Capacitor), play the effect of burning voltage.During bidirectional DC-DC converter work, upper and lower two power tube T ₁and T ₂can not be simultaneously open-minded, under lithium battery discharge mode (Boost pattern), lower power tube T ₂action, upper power tube T ₁drive singal locking, lithium battery utilizes upper power tube T ₁anti-paralleled diode D ₁afterflow to bus transferring energy, energy storage inductor L ₁existence ensure that the continuous output of electric current, and can control T be passed through ₂open duty ratio, to L ₁on the electric current that flows through control; Under lithium cell charging pattern (Buck pattern), upper power tube T ₁action, lower power tube T ₂reliable blockade, utilizes lower power tube T ₂anti-paralleled diode D ₂afterflow to lithium battery feedback energy (charging), and can pass through control T equally ₁open duty ratio, to L ₁on the electric current that flows through control.

Fig. 3 is the bidirectional DC-DC converter control principle drawing of the military interchange mobile power station of bavin storage type of the present invention; The effect of bidirectional DC-DC converter is the electric energy charge and discharge controlling lithium battery, maintains the stable of busbar voltage.As shown in Figure 3, the control method of bidirectional DC-DC converter is:

1. the switching of lithium battery Boost pattern, Buck pattern is controlled by mode selection switch ST ₁input item, i.e. the state-of-charge Soc of lithium battery, is specially: when Soc is greater than setting threshold Soc _mintime, bidirectional DC-DC converter switches to Boost pattern; Otherwise, when Soc is less than or equal to setting threshold Soc _mintime, bidirectional DC-DC converter switches to Buck pattern;

For general ferric phosphate lithium cell, Soc _mincan 40% be set as.

Under 2.Boost pattern, as DC bus-bar voltage U _dcamplitude lower than set threshold voltage U _dcmintime, DC bus-bar voltage instruction with DC bus-bar voltage U _dcdifference DELTA U _dcsend into Voltage loop proportional integral (PI) controller, obtain lower power tube modulation voltage U _d, by lower power tube modulation voltage U _dsend into PWM module, lower power tube T can be produced ₂triggering signal S _d; Otherwise DC bus-bar voltage U _dcamplitude higher than equaling set threshold voltage U _dcmintime, lower power tube T ₂triggering signal S _dbe set to zero; Under this pattern, upper power tube T ₁triggering signal be set to zero all the time, namely go up power tube T ₁be in blocking;

Under this pattern, lower power tube T ₂triggering signal arrange and need synchronous to consider that the reason of DC bus-bar voltage amplitude is: the instantaneous power output characteristic giving full play to super capacitor, allow busbar voltage to have the fluctuation of certain limit, and only have as low to a certain extent (the threshold voltage U of DC bus-bar voltage _dcmin) time, lithium battery just starts electric discharge, and maintain busbar voltage fast and stablize, this setting can reduce the number of times of lithium battery electric discharge to a certain extent, thus extends the useful life of lithium battery.

Under 3.Buck pattern, the current-order of lithium battery with the output current Δ I of lithium battery _dcdifference send into electric current loop proportional integral (PI) controller, obtain power tube modulation voltage U ' _d; By upper power tube modulation voltage U ' _dsend into the PWM module identical with step 2, power tube T can be produced ₁triggering signal S ' _d; Under this pattern, lower power tube T ₂triggering signal be always zero, namely descend power tube T ₂be in blocking;

Fig. 4 is the control principle drawing of bavin storage type of the present invention military interchange mobile power station three-phase controlled rectifier; The effect of three-phase controlled rectifier converts the output voltage of diesel generating set to direct current by interchange, and it controls to adopt the direct Power Control method based on space vector modulation.As shown in Figure 4, the control method of three-phase controlled rectifier is specially:

4. the pusher side three-phase alternating voltage U of diesel generating set output _gabcfirst sending into traditional digital phase-locked loop PLL carries out phase-locked, obtains the angular position theta of pusher side three-phase alternating voltage _g, angular frequency _gwith amplitude U _g;

5. the pusher side three-phase alternating voltage U of diesel generating set output _gabc, pusher side three-phase alternating current I _gabcsend into power computation module, obtain the active power of output P of diesel generating set _g, output reactive power Q _g;

Power calculation equation is:

$\left\{\begin{array}{c}{P}_g=U_{ga}\·I_{ga}+U_{gb}\·I_{gb}+U_{gc}\·I_{gc}\\ Q_g=1/\sqrt{3}\left(\right(U_{gb}-U_{gc})\·I_{ga})+\left(U_{gc}-U_{ga}\right)\·I_{gb}+\left(U_{ga}-U_{gb}\right)\·I_{gc})\end{array}\right.---\left(1\right)$

In formula: U _ga, U _gb, U _gcbe respectively U _gabca phase, B phase, C phase component; I _ga, I _gb, I _gcbe respectively I _gabca phase, B phase, C phase component.

6. the active power instruction of diesel generating set reactive power instruction active power of output P corresponding with it respectively _g, output reactive power Q _gdiffer from, its difference DELTA P _g, Δ Q _gsend into power ring proportional integral (PI) controller respectively, obtain the active voltage instruction V of three-phase controlled rectifier _gdwith reactive voltage instruction V _gq; Wherein, the active power instruction of diesel generating set reactive power instruction accounting equation is:

$\left\{\begin{array}{c}{P}_g^{*}=U_{dc}\·I_{load}\\ Q_g^{*}=0\end{array}\right.---\left(2\right)$

The adjustment process of PI controller in this step, can be expressed as:

$\left\{\begin{array}{c}{V}_{gd}=(k_{gp}+\frac{k_{gi}}{s})(P_g^{*}-P_g)\\ V_{gq}=(k_{gp}+\frac{k_{gi}}{s})(Q_g^{*}-Q_g)\end{array}\right.---\left(3\right)$

In formula: k _gp, k _gibe respectively proportionality coefficient and the integral coefficient of power ring PI controller.

7. step 6 obtains the active voltage instruction V of three-phase controlled rectifier _gd, reactive voltage instruction V _gqadd respective compensation term respectively, obtain the real power control voltage U of three-phase controlled rectifier _cd, idle control voltage U _cq; Concrete accounting equation is:

$\left\{\begin{array}{c}{U}_{cd}=-V_{gd}+(U_g-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{Q}_g)\\ U_{cq}=V_{gq}-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{P}_g\end{array}\right.---\left(4\right)$

In formula: L _gfor the filter inductance of three-phase controlled rectifier;

Formula (4) is control voltage expression formula during three-phase controlled rectifier employing direct Power Control, and its derivation is described below:

Under rotating forward synchronous speed rotating coordinate system, the instantaneous power of three-phase controlled rectifier can be expressed as:

$\begin{array}{c}{P}_g+{\mathrm{jQ}}_g=\frac{3}{2}{U}_{gdq}\·{\hat{I}}_{gdq}\\ =\frac{3}{2}\frac{U_g}{L_g}({\widehat{\mathrm{\ψ}}}_{gdq}-{\widehat{\mathrm{\ψ}}}_{cdq})\end{array}---\left(5\right)$

In formula: U _gdqfor the input voltage vector of three-phase controlled rectifier under rotating forward synchronous speed rotating coordinate system, that is the output voltage vector of diesel generating set; for the input current vector I of three-phase controlled rectifier under rotating forward synchronous speed rotating coordinate system _gdqthe conjugate vector of (that is output current vector of diesel generating set); for the input flux linkage vector ψ of three-phase controlled rectifier _gdqconjugate vector; for the control flux linkage vector ψ of three-phase controlled rectifier _cdqconjugate vector.

When adopting d axle grid voltage orientation, have:

$\left\{\begin{array}{c}{U}_{gd}=-{\mathrm{\ω}}_g{\mathrm{\ψ}}_{gq}=U_g\\ U_{gq}={\mathrm{\ω}}_g{\mathrm{\ψ}}_{gd}=0\end{array}\right.---\left(6\right)$

In formula: U _gd, U _gqbe respectively U _gdqd axle, q axle component; ψ _gd, ψ _gqbe respectively ψ _gdqd axle, q axle component.

Bring formula (6) into formula (5), and write as scalar form, can obtain:

$\left\{\begin{array}{c}{P}_g=-\frac{3}{2}\frac{U_g}{L_g}{\mathrm{\ψ}}_{cd}\\ Q_g=\frac{3}{2}\frac{U_g}{L_g}({\mathrm{\ψ}}_{cq}+\frac{U_g}{{\mathrm{\ω}}_g})\end{array}\right.---\left(7\right)$

In formula: ψ _cd, ψ _cqbe respectively ψ _cdqd axle, q axle component.

Formula (7) equal sign both sides are got respectively and differentiate, can obtain:

$\left\{\begin{array}{c}\frac{{\mathrm{d\ψ}}_{cd}}{dt}=-\frac{2}{3}\frac{L_g}{U_g}\frac{{\mathrm{dP}}_g}{dt}=-\frac{2}{3}\frac{L_g}{U_g}\frac{P_g^{*}-P_g}{T_s}\\ \frac{{\mathrm{d\ψ}}_{cq}}{dt}=\frac{2}{3}\frac{L_g}{U_g}\frac{{\mathrm{dQ}}_g}{dt}=\frac{2}{3}\frac{L_g}{U_g}\frac{Q_g^{*}-Q_g}{T_s}\end{array}\right.---\left(8\right)$

In formula: T _sfor system communication cycle.Under rotating forward synchronous speed rotating coordinate system, the voltage equation of three-phase controlled rectifier can be expressed as:

U _cdq＝dψ _cdq/dt+jω _gψ _cdq(9)

In formula: U _cdqfor the control voltage vector of three-phase controlled rectifier.

Bring formula (7), (8) into formula (9), can obtain:

$\left\{\begin{array}{c}{U}_{cd}=-\frac{2}{3}\frac{L_g}{U_g{T}_s}(P_g^{*}-P_g)-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{Q}_g+U_g\\ U_{cq}=\frac{2}{3}\frac{L_g}{U_g{T}_s}(Q_g^{*}-Q_g)-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{P}_g\end{array}\right.---\left(10\right)$

Like this, when adoption rate integration (PI) controller regulates meritorious, reactive power, formula (10) can be re-expressed as:

$\begin{array}{c}\left\{\begin{array}{c}{U}_{cd}=-(k_{gp}+\frac{k_{gi}}{s})(P_g^{*}-P_g)-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{Q}_g+U_g\\ U_{cq}=(k_{gp}+\frac{k_{gi}}{s})(Q_g^{*}-Q_g)-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{P}_g\end{array}\right.---\left(11\right)\\ \left\{\begin{array}{c}{U}_{cd}=-\frac{2}{3}\frac{L_g}{U_g{T}_s}(P_g^{*}-P_g)-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{Q}_g+U_g\\ U_{cq}=\frac{2}{3}\frac{L_g}{U_g{T}_s}(Q_g^{*}-Q_g)-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{P}_g\end{array}\right.---\left(10\right)\end{array}$

Further, (3) are brought into formula (11), formula (4).Card is finished.

8. the angular position theta of the pusher side three-phase alternating voltage utilizing step 7 to obtain _gto the real power control voltage U that step 7 obtains _cd, idle control voltage U _cqcarry out Park inverse transformation, obtain the meritorious regulation voltage U under rest frame _{c α}, Reactive-power control voltage U _{c β};

Park inverse transformation process can be expressed as:

$\left[\begin{array}{c}{U}_{c\mathrm{\α}}\\ U_{c\mathrm{\β}}\end{array}\right]=\left[\begin{array}{cc}{\mathrm{cos\θ}}_g& {\mathrm{sin\θ}}_g\\ -{\mathrm{sin\θ}}_g& {\mathrm{cos\θ}}_g\end{array}\right]\left[\begin{array}{c}{U}_{cd}\\ U_{cq}\end{array}\right]---\left(12\right)$

9. the meritorious regulation voltage U under rest frame step 8 obtained _{c α}, Reactive-power control voltage U _{c β}carry out space vector modulation (SVM), the switching signal s of three-phase controlled rectifier can be obtained _a, s _b, s _c, realize the effective control to three-phase controlled rectifier.

Fig. 4 is the control principle drawing of the controlled inverter of bavin storage type of the present invention military interchange mobile power station three-phase; The effect of the controlled inverter of three-phase is the three-phase alternating current be converted to by direct current needed for load, and administers harmonic pollution in electric power net.With reference to Fig. 4, the control method of the controlled inverter of three-phase is:

10. generate the three-phase voltage instruction of the controlled inverter of three-phase be specially:

$\left\{\begin{array}{c}{u}_{na}^{*}=M\·sin({\mathrm{\ω}}_g\·t+{\mathrm{\ω}}_0)\\ u_{nb}^{*}=M\·sin({\mathrm{\ω}}_g\·t+{\mathrm{\ω}}_0-2\mathrm{\π}/3)\\ u_{nc}^{*}=M\·sin({\mathrm{\ω}}_g\·t+{\mathrm{\ω}}_0+2\mathrm{\π}/3)\end{array}\right.---\left(13\right)$

In formula: M is the amplitude of phase voltage, and has ω ₀for the starting phase angle of three-phase voltage, generally can zero be set to, i.e. ω ₀=0; be respectively a phase, B phase, C phase component;

11. with reference to step 4, three-phase voltage instruction step 10 generated send into traditional digital phase-locked loop PLL, obtain the output voltage angular position theta of the controlled inverter of three-phase _n;

The 12. output voltage angular position thetas utilizing step 11 to obtain _nrespectively to three-phase voltage instruction with net side three-phase alternating voltage u _nabccarry out Park conversion, obtain the voltage on line side instruction of the controlled inverter of three-phase with voltage on line side vector u _ndq;

With to three-phase voltage instruction park be transformed to example, its matrix equation can be expressed as:

$\left[\begin{array}{c}{u}_{nd}^{*}\\ u_{nq}^{*}\end{array}\right]=\left[\begin{array}{ccc}{\mathrm{cos\θ}}_n& \cos ({\mathrm{\θ}}_n-\frac{2\mathrm{\π}}{3})& \cos ({\mathrm{\θ}}_n+\frac{2\mathrm{\π}}{3})\\ -{\mathrm{sin\θ}}_n& -\sin ({\mathrm{\θ}}_n-\frac{2\mathrm{\π}}{3})& -\sin ({\mathrm{\θ}}_n+\frac{2\mathrm{\π}}{3})\end{array}\right]\left[\begin{array}{c}{u}_{na}^{*}\\ u_{nb}^{*}\\ u_{nc}^{*}\end{array}\right]---\left(14\right)$

In formula: be respectively d axle, q axle component.

The voltage on line side instruction of the controlled inverter of 13. three-phase that step 12 is obtained with voltage on line side vector u _ndqdifference DELTA u _ndqsend into Voltage loop proportional integral-resonance (PI-R) controller, obtain the control voltage v of the controlled inverter of three-phase _cdq; Wherein, the transfer function of proportional integral-resonance (PI-R) controller under s territory is:

$G_R\left(s\right)=K_p+\frac{K_i}{s}+\frac{K_{r}s}{s^2+2{\mathrm{\ω}}_{c}s+{\left(6{\mathrm{\ω}}_g\right)}^2}---\left(15\right)$

In formula: K _p, K _i, K _rbe respectively the proportionality coefficient of PI-R controller, integral coefficient and resonance coefficient; ω _cfor the cut-off frequency of resonant controller, be mainly used in increasing the responsive bandwidth of resonant controller, reduce its sensitivity to resonance point frequency fluctuation.

Here, the reason adopting PI-R to replace traditional PI controller is: many containing a large amount of 5 times, 7 subharmonic in military load equipment, if do not administered, the distortion of the controlled inverter output voltage of three-phase will be caused, and then affect the security of operation of other responsive power consumption equipments.It is worth noting, for 5 times, 7 subharmonic show as 6 times of mains frequency (6 ω under rotating forward synchronous speed rotating coordinate system _g) negative phase-sequence, positive sequence alternating current component.And traditional PI controller can only realize regulating the floating of DC component, be 6 ω to frequency _galternating current component then helpless.Resonant controller then has good positive and negative sequence two-way resonance characteristic, can be specifically designed to adjustment high-frequency AC components.So PI-R controller selected by voltage controller in the present invention, make up the amplitude attenuation defect of PI controller at HFS with this, and then realization is to the unification of voltage fundamental component, harmonic component and quick adjustment.

14. with reference to step 8, the output voltage angular position theta utilizing step 11 to obtain _nto the control voltage v of the controlled inverter of three-phase that step 13 obtains _cdqmake Park inverse transformation, the modulation voltage u of the controlled inverter of three-phase under acquisition rest frame _{c α β};

15. with reference to step 9, the modulation voltage u of the controlled inverter of three-phase step 14 obtained _{c α β}send into space vector modulation (SVM) module, the switching signal s of the controlled inverter of three-phase can be produced ₁, s ₂, s ₃, realize controlling the expection of the controlled inverter of three-phase.

Above-mentioned steps 1 ~ 15 together constitutes the electric energy quality control method of the military interchange mobile power station of bavin storage type of the present invention.

Simulation run result when Fig. 6 is bavin storage type of the present invention military interchange mobile power station access pulse power load; I in figure _nabcfor the net side three-phase alternating current that inverter/converter exports, the same Fig. 1 of other symbol implications.As can be seen from Figure 6, bavin storage type of the present invention military interchange mobile power station has stronger dynamic load capacity, is embodied in: the 1) switching of the pulsating load net side three-phase alternating voltage u that do not cause inverter/converter to export _nabcthe vibration of waveform or distortion; 2), when pulse load drops into, first composite energy storing device exports instantaneous electric energy (see I _dcwaveform, a similar spike form), guarantee the stable (see U of busbar voltage _dcwaveform, fluctuate about 2V up and down), the average power afterwards needed for diesel generating set output loading is (see I _gabcwaveform), this structural design enhances the ability that military AC power station resists external pulse load disturbance.

Simulation run result when Fig. 7 is bavin storage type of the present invention military interchange mobile power station access nonlinear load.In order to show the superiority of the electric energy quality control method of the military interchange mobile power station of bavin storage type of the present invention, emulation point two stages carry out: 1) stage I (0.1 ~ 0.2s), the voltage controller of inverter/converter adopts traditional PI controller, administers control without electric network pollution; 2) stage II (0.2 ~ 0.3s), the voltage controller of inverter/converter adopts PI-R controller of the present invention, has electric network pollution to administer and controls.The net side three-phase alternating voltage u that in comparison diagram 7, inverter/converter exports _nabcwith net side three-phase alternating current i _nabcwaveform known, under conventional PI control, containing abundant 5 times, 7 subharmonic in voltage, current waveform, the security of operation of other responsive power consumption equipments in parallel in serious threat electrical network; After adopting control strategy of the present invention, harmonic pollution in electric power net obtains effective improvement, calculates through Fourier analysis, and the total harmonic distortion rate (THD) of net side three-phase alternating voltage drops to 3.6% of stage II by 9.36% of stage I.

To sum up, the military interchange mobile power station of a kind of bavin storage type of the present invention and electric energy quality control method thereof, effectively can stabilize the DC bus-bar voltage fluctuation that pulse power load causes, and the voltage harmonic that can effectively suppress load end to be introduced, improve and export the quality of power supply, thus guarantee the safe and reliable operation of sensitivity electric loading.The existence of composite energy storing device makes the capacity of diesel generating set significantly reduce on the one hand, on the other hand owing to combining the advantage of lithium battery high-energy-density, super capacitor high power density, the discharge and recharge number of times and the external electromagnetic that effectively control lithium battery are impacted, and extend the useful life of equipment.

Claims (2)

1. the military interchange mobile power station of bavin storage type, it is characterized in that, described bavin storage type military interchange mobile power station mainly comprises following building block: the controlled inverter of diesel generating set, lithium battery, super capacitor, three-phase controlled rectifier, bidirectional DC-DC converter and three-phase; Above-mentioned each component integration is within a military standard shelter, and between each parts, there is following electric connecting relation: the three-phase alternating current output of diesel generating set is connected to the input of three-phase controlled rectifier, and the output of three-phase controlled rectifier is parallel on DC bus; The output of lithium battery is connected to the low-pressure end of bidirectional DC-DC converter, and the high-pressure side of bidirectional DC-DC converter is parallel on DC bus; Super capacitor is directly parallel on DC bus; The input of the controlled inverter of three-phase is connected on DC bus, and the output of the controlled inverter of three-phase is connected to power consumption equipment.

2. an electric energy quality control method for the military interchange mobile power station of bavin storage type according to claim 1, is characterized in that, mainly comprise the following steps:

A1. transducer is utilized to gather following signal: the pusher side three-phase alternating voltage U that diesel generating set exports _gabcwith pusher side three-phase alternating current I _gabc, output current (or discharging current) I of lithium battery _dc, DC bus-bar voltage U _dc, the net side three-phase alternating voltage u that the controlled inverter of three-phase exports _nabc, DC side load current I _load;

A2. according to the state-of-charge Soc of lithium battery, the control model of bidirectional DC-DC converter is divided into Boost pattern and Buck pattern, is specially:

A2.1. when the state-of-charge Soc of lithium battery is greater than setting threshold Soc _mintime, bidirectional DC-DC converter switches to Boost pattern; Otherwise, when Soc is less than or equal to setting threshold Soc _mintime, bidirectional DC-DC converter switches to Buck pattern;

A2.2. under Boost pattern, as DC bus-bar voltage U _dcamplitude lower than set threshold voltage U _dcmintime, by DC bus-bar voltage instruction with DC bus-bar voltage U _dcdifference DELTA U _dcsend into Voltage loop pi controller, obtain lower power tube modulation voltage U _d; By lower power tube modulation voltage U _dsend into PWM module, the lower power tube T of bidirectional DC-DC converter can be produced ₂triggering signal S _d; Otherwise DC bus-bar voltage U _dcamplitude be more than or equal to set threshold voltage U _dcmintime, lower power tube T ₂triggering signal S _dbe set to zero; Under Boost pattern, the upper power tube T of bidirectional DC-DC converter ₁triggering signal be set to zero all the time, namely go up power tube T ₁be in blocking;

A2.3. under Buck pattern, by the current-order of lithium battery with the output current I of lithium battery _dcdifference DELTA I _dcsend into electric current loop pi controller, obtain power tube modulation voltage U ' _d; By upper power tube modulation voltage U ' _dsend into the PWM module identical with steps A 2.2, power tube T can be produced ₁triggering signal S ' _d; Under Buck pattern, lower power tube T ₂triggering signal be always zero, namely descend power tube T ₂be in blocking;

A3. three-phase controlled rectifier adopts the improvement direct Power Control method based on space vector modulation, is specially:

A3.1. the pusher side three-phase alternating voltage U of diesel generating set output _gabcfirst sending into traditional digital phase-locked loop PLL carries out phase-locked, obtains the angular position theta of pusher side three-phase alternating voltage _g, angular frequency _gwith amplitude U _g;

A3.2. the pusher side three-phase alternating voltage U of diesel generating set output _gabc, pusher side three-phase alternating current I _gabcsend into power computation module, obtain the active power of output P of diesel generating set _g, output reactive power Q _g;

A3.3. the active power instruction of diesel generating set reactive power instruction active power of output P corresponding with it respectively _g, output reactive power Q _gdiffer from, its difference DELTA P _g, Δ Q _gsend into power ring pi controller respectively, obtain the active voltage instruction V of three-phase controlled rectifier _gdwith reactive voltage instruction V _gq; Wherein, the active power instruction of diesel generating set reactive power instruction accounting equation is:

$\left\{\begin{array}{c}{P}_g^{*}=U_{dc}\·I_{load}\\ Q_g^{*}=0\end{array}\right.;$

The active voltage instruction V of the three-phase controlled rectifier A3.4. steps A 3.3 obtained _gd, reactive voltage instruction V _gqadd respective compensation term respectively, obtain the real power control voltage U of three-phase controlled rectifier _cd, idle control voltage U _cq; Concrete accounting equation is:

$\left\{\begin{array}{c}{U}_{cd}=-V_{gd}+(U_g-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{Q}_g)\\ U_{cq}=V_{gq}-\frac{2}{3}\frac{{\mathrm{\ω}}_g{L}_g}{U_g}{P}_g\end{array}\right.;$

In formula: L _gfor the filter inductance of three-phase controlled rectifier;

The angular position theta of the pusher side three-phase alternating voltage A3.5. utilizing steps A 3.1 to obtain _gto the real power control voltage U that steps A 3.4 obtains _cd, idle control voltage U _cqcarry out Park inverse transformation, obtain the meritorious regulation voltage U under rest frame _{c α}, Reactive-power control voltage U _{c β};

A3.6. the meritorious regulation voltage U under rest frame steps A 3.5 obtained _{c α}, Reactive-power control voltage U _{c β}carry out space vector modulation, the switching signal s of three-phase controlled rectifier can be obtained _a, s _b, s _c, realize the effective control to three-phase controlled rectifier;

A4. direct current is converted to the three-phase alternating current needed for load by the controlled inverter of three-phase, and administers harmonic pollution in electric power net, and its control method is:

A4.1. the three-phase voltage instruction of the controlled inverter of three-phase is generated be specially:

$\left\{\begin{array}{c}{u}_{na}^{*}=M\·sin({\mathrm{\ω}}_g\×t+{\mathrm{\ω}}_0)\\ u_{nb}^{*}=M\·sin({\mathrm{\ω}}_g\×t+{\mathrm{\ω}}_0-2\mathrm{\π}/3)\\ u_{nc}^{*}=M\·sin({\mathrm{\ω}}_g\×t+{\mathrm{\ω}}_0+2\mathrm{\π}/3)\end{array}\right.;$

In formula: M is the amplitude of phase voltage, and has ω ₀for the starting phase angle of three-phase voltage, be set to zero; be respectively three-phase voltage instruction a phase, B phase, C phase component;

A4.2. with reference to steps A 3.1, the three-phase voltage instruction that steps A 4.1 is generated send into traditional digital phase-locked loop PLL, obtain the output voltage angular position theta of the controlled inverter of three-phase _n;

A4.3. the output voltage angular position theta that steps A 4.2 obtains is utilized _n, respectively to three-phase voltage instruction with net side three-phase alternating voltage u _nabccarry out Park conversion, obtain the voltage on line side instruction of the controlled inverter of three-phase with voltage on line side vector u _ndq;

The voltage on line side instruction of the controlled inverter of three-phase A4.4. steps A 4.3 obtained with voltage on line side vector u _ndqdifference DELTA u _ndqsend into Voltage loop proportional integral-resonant controller, obtain the control voltage v of the controlled inverter of three-phase _cdq; Wherein, the transfer function of proportional integral-resonance (PI-R) controller under s territory is:

$G_R\left(s\right)=K_p+\frac{K_i}{s}+\frac{K_{r}s}{s^2+2{\mathrm{\ω}}_{c}s+{\left(6{\mathrm{\ω}}_g\right)}^2};$

In formula: K _p, K _i, K _rbe respectively the proportionality coefficient of proportional integral-resonant controller, integral coefficient and resonance coefficient; ω _cfor the cut-off frequency of resonant controller;

A4.5. with reference to steps A 3.5, the output voltage angular position theta that steps A 4.2 obtains is utilized _nthe control voltage v of the controlled inverter of three-phase that steps A 4.4 is obtained _cdqmake Park inverse transformation, the modulation voltage u of the controlled inverter of three-phase under acquisition rest frame _{c α β};

A4.6. with reference to steps A 3.6, the modulation voltage u of the controlled inverter of three-phase that steps A 4.5 is obtained _{c α β}send into space vector modulation module, the switching signal s of the controlled inverter of three-phase can be produced ₁, s ₂, s ₃, realize controlling the expection of the controlled inverter of three-phase.