CN103618336A - Output digital modulation circuit and control system of rectifier type high-frequency chain grid-connected inverter - Google Patents
Output digital modulation circuit and control system of rectifier type high-frequency chain grid-connected inverter Download PDFInfo
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Abstract
The invention discloses an output digital modulation circuit and control system of a rectifier type high-frequency chain grid-connected inverter. The circuit comprises an input voltage U[in], a sinusoidal modulation high-frequency chain inverter, a high-frequency isolation transformer, a synchronous rectifier, a power frequency inverter and an LCL filter. The control system comprises a voltage sensor, a current sensor and a DSP digital controller. The sinusoidal modulation high-frequency chain inverter is composed of four power MOSFETs. The primary side and auxiliary side of the high-frequency isolation transformer are respectively of a single-winding structure. The synchronous rectifier is composed of four IGBTs and an anti-parallel diode. The power frequency inverter is also composed of four IGBTs and an anti-parallel diode. The LCL filter is composed of an inductor L1, an inductor L2 and a capacitor C. The output digital modulation circuit and control system of the rectifier type high-frequency chain grid-connected inverter achieve high-frequency electrical isolation of input and output, have the advantages of being small in size and light in weight and are very suitable for photovoltaic grid-connected generation systems.
Description
Technical field
The present invention relates to a kind of output Digital Modulation circuit and control system of rectifier type High Frequency Link combining inverter, belong to converters and control technology field thereof.
Background technology
The day by day exhausted of fossil energy needs us to find the suitable alternative energy, and solar energy is a kind of inexhaustible green energy resource, and photovoltaic cell capable of generating power is a kind of effective ways that utilize solar energy.And that photovoltaic cell output voltage is affected by Changes in weather is larger, its fluctuation range is to effectively utilizing solar electric power to cause certain difficulty.At present, by combining inverter, electric energy being delivered directly to electrical network is a kind of comparatively general method.
If adopt the electrical energy changer of non-electrical isolation, direct-to-ground capacitance effect due to photovoltaic cell, converter, for common mode current provides low-impedance circulation path, causes in grid-connected current and contains relatively large leakage current, makes grid-connected current quality can not meet the requirement of relevant criterion.At present, in order to overcome the problem of grid-connected leakage current, have two kinds of methods, one is the circuit structure that improves non-isolation type combining inverter, and another is the High Frequency Link combining inverter that adopts high-frequency isolation.The circuit structure that improves non-isolation type combining inverter by increasing switching tube reduces the size of common-mode voltage, thereby reduce the size of leakage current, although it is efficient, high-quality grid-connected that the method can realize, but due to the voltage matches problem of the safety problem existing and input, outlet side, its application is still subject to certain restrictions.High-frequency chain inverter has been realized the electrical isolation between photovoltaic cell and electrical network, cut off the circulation path of common mode current, high frequency transformer increases limited on volume and weight, but has solved the problem that input, output voltage match, therefore, high-frequency chain inverter is widely used.
Than the High Frequency Link combining inverter that adopts circuit of reversed excitation, forward converter to form, the high-frequency chain inverter that bridge circuit is basic structure can be processed larger power, and therefore application is also more extensive.
Bridge-type High Frequency Link combining inverter mainly contains three kinds of structures: one, with the DC/DC conversion device+bridge-type inverter of high-frequency isolation; Two, high-frequency inverter+high frequency transformer+frequency converter; Three, high-frequency inverter+high frequency transformer+synchronous rectifier+bridge-type inverter.
In foregoing circuit structure, the first control program is generated electricity unsettled photovoltaic cell to press and is obtained through high-frequency isolation the VD matching with output voltage, then obtains sinusoidal voltage through bridge-type inverter sinusoidal pulse width modulation.The method advantage is can optimal control, and the MPPT maximum power point tracking of photovoltaic cell can be realized by the DC/DC conversion device of the high-frequency isolation of prime, and grid-connected current waveform quality is realized by the bridge-type inverter of rear class; But also there is obvious shortcoming in this converter, be preceding stage high frequency isolation DC/DC conversion device need quality, volume all larger direct current LC filter just can obtain the good direct current of quality, and the life-span of DC filtering electrochemical capacitor also becomes a decisive factor in restriction converter life-span; In addition, in this kind of control program, all switching tubes are all operated in high frequency state, are relatively difficult to realize soft switch.All these characteristics have determined that the cost of this control program is higher, and converter volume, weight are larger, and conversion efficiency is also lower.
Compare with the first control program, the second control program has been saved direct voltage link, adopt frequency converter directly high-frequency alternating current to be transformed to industrial-frequency alternating current, also saved thus volume, direct current LC filter that weight is larger, conversion efficiency is improved; But what frequency converter adopted is bidirectional switch, the quantity of switching device does not reduce, and all switching tubes all must operate at high-frequency work, are difficult to further raising efficiency.
The third control program is directly removed the direct current LC filter in the first scheme, in addition, for convenience of AC energy feedback, changes the diode rectifier circuit in the DC/DC conversion device of high-frequency isolation into circuit of synchronous rectification that full control device forms.If Sine Modulated is carried out in the inverter of rear class, this control program obtains high-frequency direct-current square-wave voltage jaggy at synchronous rectifier output, the impact that this breach voltage can be larger on the mass formation of inverter output voltage waveform so, and, the same with the second control program, all switching devices all work in high frequency, and efficiency is difficult to improve.
Therefore, find the performance that suitable circuit structure and corresponding modulation strategy improve high-frequency chain inverter, raise the efficiency to realize being necessary, this programme produces thus.
Summary of the invention
Goal of the invention: for problems of the prior art and deficiency, the invention provides a kind of output Digital Modulation circuit and control system of rectifier type High Frequency Link combining inverter, improve the conversion efficiency of high-frequency chain inverter, reduce the heat radiation requirement of inverter, guarantee high-quality output characteristic.
Technical scheme: a kind of output Digital Modulation circuit of rectifier type High Frequency Link combining inverter, comprises input voltage U
in, Sine Modulated high-frequency chain inverter, high-frequency isolation transformer, synchronous rectifier, LCL filter.
Sine Modulated high-frequency chain inverter comprises band anti-also the first switching tube, second switch pipe, the 3rd switching tube and the 4th switching tube of diode, the source electrode of the first switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of second switch pipe is connected with the drain electrode of the 4th switching tube, and the drain electrode of the first switching tube connects the drain electrode of second switch pipe, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube; The positive pole of input power is connected between the drain electrode of the first switching tube and the drain electrode of second switch pipe; The negative pole of input power is connected between the source electrode of the 3rd switching tube and the source electrode of the 4th switching tube.
Synchronous rectifier comprises band anti-also the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube of diode, the emitter of the 5th switching tube is connected with the collector electrode of the 7th switching tube, the emitter of the 6th switching tube is connected with the collector electrode of the 8th switching tube, and the collector electrode of the 5th switching tube connects the collector electrode of the 6th switching tube, the emitter of the 7th switching tube connects the emitter of the 8th switching tube.
High-frequency isolation transformer comprises former limit winding and secondary winding, wherein transformer primary side winding is two terminals, be respectively the first terminal, the second terminal, transformer secondary winding also has two terminals, be respectively the 3rd terminal, the 4th terminal, wherein transformer the first terminal is connected between the source electrode of the first switching tube and the drain electrode of the 3rd switching tube, and transformer the second connecting terminals is connected between the source electrode of second switch pipe and the drain electrode of the 4th switching tube; Transformer the 3rd connecting terminals is connected between the emitter of the 5th switching tube and the collector electrode of the 7th switching tube, and transformer the 4th connecting terminals is connected between the emitter of the 6th switching tube and the collector electrode of the 8th switching tube.
Power frequency inverter comprises the 9th switching tube, the tenth switching tube, the 11 switching tube and the twelvemo pass pipe of the anti-also diode of band, the emitter of the 9th switching tube is connected with the collector electrode of the 11 switching tube, the emitter of the tenth switching tube is connected with the collector electrode that twelvemo is closed pipe, and the collector electrode of the 9th switching tube connects the collector electrode of the tenth switching tube, the emitter of the 11 switching tube connects the emitter that twelvemo is closed pipe.In addition,, in synchronous rectifier and power frequency inverter, the collector electrode of the collector electrode of the collector electrode of the 5th switching tube, the 6th switching tube, the collector electrode of the 9th switching tube, the tenth switching tube interconnects; The emitter that the emitter of the 7th switching tube, the 8th emitter of switching tube, the emitter of the 11 switching tube, twelvemo are closed pipe interconnects.
One end of the first inductance and the 9th emitter of switching tube in LCL filter are, the collector electrode of the 11 switching tube links together, and the other end of the first inductance is connected with one end of one end of filter capacitor and the second inductance; The other end of the second inductance is connected with the live wire of electrical network; The collector electrode that the emitter of the other end of filter capacitor and electrical network zero line, the tenth switching tube and twelvemo are closed pipe links together.
A numerical control system for rectifier type High Frequency Link combining inverter, comprises voltage sensor, current sensor and DSP digitial controller; Wherein DSP digitial controller comprises that phase-locked loop, subtracter, duty-cycle loss calculating, grid-connected current adjuster, adder and signal conditioner form;
The input of voltage sensor is connected to the two ends of above-mentioned electrical network, and current sensor input and above-mentioned the first inductance are in series;
The input of the output termination phase-locked loop of voltage sensor, the positive input terminal of the output termination subtracter of phase-locked loop, the output of current sensor is connected to the negative input end of subtracter and the input of duty-cycle loss computing module, the input of the output termination grid-connected current adjuster of subtracter, two inputs of adder connect respectively the output of duty-cycle loss computing module and the output of grid-connected current adjuster, the first terminal of the output termination signal conditioner of adder, the second terminal of signal conditioner is exported the first switching tube, second switch pipe, the driving signal of the 3rd switching tube and the 4th switching tube, the 3rd terminal output the 5th switching tube of signal conditioner, the 6th switching tube, the driving signal of the 7th switching tube and the 8th switching tube, the 4th terminal output the 9th switching tube of signal conditioner, the tenth switching tube, the 11 switching tube and twelvemo are closed the driving signal of pipe.
In the numerical control system of rectifier type High Frequency Link combining inverter, first adopt the feedback signal of voltage sensor senses line voltage, utilize digital phase-locked loop to obtain the fiducial value of the grid-connected current of synchronizeing with line voltage, the amplitude of this fiducial value obtains according to the maximal power tracing point of generation of electricity by new energy device; Adopt current sensor to detect the first filter inductance current feedback signal, by phase-locked loop gained reference signal and the first inductor current feedback signal subtraction, obtain grid-connected current error signal, the input signal using grid-connected current error signal as grid-connected current adjuster; Owing to there being the loss of duty ratio in main circuit, for obtaining high-quality output waveform, according to the size of inverter output current estimation duty-cycle loss, be then added with grid-connected current regulator output signal, so can greatly improve the output quality of grid-connected current.
Beneficial effect: Sine Modulated of the present invention is carried out in transformer primary side side inverter, by synchronous rectifier, obtain thering is the DC pulse voltage that sinusoidal rule changes, through power frequency inverter, by pulse direct current inversion, be industrial-frequency alternating current again, use in the rectifier type high-frequency chain inverter of this modulating circuit modulates, switching device power frequency switch in power frequency inverter, synchronous rectifier, in power frequency inverter, all switching devices have been realized zero voltage switch, in high-frequency inverter, switching device also can be realized zero voltage switch the most of operating time in a power frequency period, can greatly improve the efficiency of high-frequency chain inverter, reduce heat radiation requirement, in addition, the phenomenon that has the output voltage waveforms distortion that duty-cycle loss causes according to synchronous rectifier output voltage, according to the size of the size prediction duty-cycle loss of inverter output current, then compensate in sinusoidal modulation wave, can greatly improve the quality of inverter output waveforms.
Accompanying drawing explanation
Fig. 1 is rectifier type High Frequency Link combining inverter and the Digital Modulation circuit block diagram thereof of the embodiment of the present invention;
Fig. 2 is the schematic diagram of the modulation of the signal conditioner signal in DSP digitial controller in the embodiment of the present invention;
Fig. 3 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than main oscillogram in 0 o'clock switch periods;
Fig. 4 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than the fundamental diagram of 0 o'clock mode 0;
Fig. 5 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than the fundamental diagram of 0 o'clock mode 1;
Fig. 6 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than the fundamental diagram of 0 o'clock mode 2;
Fig. 7 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than the fundamental diagram of 0 o'clock mode 3;
Fig. 8 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than the fundamental diagram of 0 o'clock mode 4;
Fig. 9 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than the fundamental diagram of 0 o'clock mode 5;
Figure 10 is that the embodiment of the present invention is greater than 0 at output voltage, and inductive current is greater than the fundamental diagram of 0 o'clock mode 6;
Designation in figure: U
in---input voltage; S1-S12---the first switching tube to the twelvemo is closed pipe; W
1---the former limit of high-frequency isolation transformer winding; W
2---high-frequency isolation transformer secondary winding; i
w1---the former limit of high-frequency isolation transformer input current; u
w1---high-frequency isolation transformer original edge voltage; i
w2---high-frequency isolation transformer secondary output current; u
w2---high-frequency isolation transformer secondary voltage; u
r---synchronous rectifier output voltage; u
t---power frequency inverter output voltage; i
l1---power frequency inverter output current; u
o---output voltage after high-frequency chain inverter filtering; u
g---line voltage; L
1, L
2, C---LCL filter inductance, capacitance; u
gf---line voltage value of feedback; i
ref---grid-connected current reference value; i
lf---high-frequency chain inverter output current value of feedback; i
e---grid-connected current feedback error signal; i
r1---duty-cycle loss compensating signal; i
r2---grid-connected current closed-loop adjustment output signal; i
r---high-frequency chain inverter sinusoidal modulation signal; u
s1～u
s12---the driving signal of switching tube S1～S12; | i
r|---the absolute value signal of conditioned signal is controlled in high-frequency chain inverter output; T1CTR～T3CTR---the clocking value of timer T1～T3 in DSP; T3PR---the periodic quantity of timer T3 in DSP; CMP1R～CMP2R---timer T1 in DSP～T2 increases the comparison value of timing; CMP1D～CMP2D---in DSP, timer T1～T2 subtracts the comparison value of timing.
Embodiment
Below in conjunction with specific embodiment, further illustrate the present invention, should understand these embodiment is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
As shown in Figure 1, rectifier type high-frequency chain inverter comprises input voltage U
in, Sine Modulated high-frequency inverter, high-frequency isolation transformer T, synchronous rectifier, power frequency inverter and LCL filter, below put up with its interconnected relationship and building block and be elaborated.
Sine Modulated high-frequency chain inverter adopts phase-shift control mode, phase shift angle is sinusoidal rule and changes, comprise the anti-also power MOSFET of diode of band, label is respectively S1-S4, the source electrode of S1 is connected with the drain electrode of S3, the source electrode of S2 is connected with the drain electrode of S4, and the drain electrode of S1 connects the drain electrode of S2, the source electrode of the source electrode connection S4 of S3; The positive pole of input power is connected between the drain electrode of S1 and the drain electrode of S2; The negative pole of input power is connected between the source electrode of S3 and the source electrode of S4.
Synchronous rectifier adopts band insulated gate bipolar transistor anti-and diode to form, label is respectively S5-S8, and the emitter of S5 is connected with the collector electrode of S7, and the emitter of S6 is connected with the collector electrode of S8, and the collector electrode of S5 connects the collector electrode of S6, the emitter of S7 connects the emitter of S8.
High-frequency isolation transformer T comprises former limit winding and secondary winding, wherein transformer primary side winding is two terminals, be respectively the 1st terminal, the 2nd terminal, transformer secondary winding also has two terminals, be respectively the 3rd terminal, the 4th terminal, wherein transformer the 1st connecting terminals is connected between the source electrode of S1 and the drain electrode of S3, and transformer the 2nd connecting terminals is connected between the source electrode of S2 and the drain electrode of S4; Transformer the 3rd connecting terminals is connected between the emitter of S5 and the collector electrode of S7, and transformer the 4th connecting terminals is connected between the emitter of S6 and the collector electrode of S8.
Power frequency inverter adopts band insulated gate bipolar transistor anti-and diode to form, label is respectively S9-S12, the emitter of S9 is connected with the collector electrode of S11, the emitter of S10 is connected with the collector electrode of S12, and the collector electrode of S9 connects the collector electrode of S10, the emitter of S11 connects the emitter of S12.In addition,, in synchronous rectifier and power frequency inverter T, the collector electrode of S5, the collector electrode of S6, the collector electrode of S9, the collector electrode of S10 interconnect; The emitter of S7, the emitter of S8, the emitter of S11, the emitter of S12 interconnect.
Inductance L in LCL filter
1one end and the emitter of S9, the collector electrode of S11 link together, inductance L
1the other end and one end and the inductance L of filter capacitor C
2one end connect; Inductance L
2the other end be connected with the live wire of electrical network; The other end of filter capacitor C and electrical network zero line, the emitter of S10 and the collector electrode of S12 link together.
The numerical control system of rectifier type High Frequency Link combining inverter, comprises voltage sensor, current sensor and DSP digitial controller; Wherein DSP digitial controller comprises that phase-locked loop, subtracter, duty-cycle loss calculating, grid-connected current adjuster, adder and signal conditioner form;
The input of voltage sensor is connected to the two ends of above-mentioned electrical network, and current sensor input and above-mentioned the first inductance are in series;
The output voltage u of voltage sensor
gfconnect the input of phase-locked loop, the output voltage i of phase-locked loop
refconnect the positive input terminal of subtracter, be used as the fiducial value of grid-connected current; The output voltage i of current sensor
lfbe connected to the negative input end of subtracter as the value of feedback of grid-connected current closed loop, voltage i
refdeduct voltage i
lfobtain the error voltage i of grid-connected current closed loop
e, i
eas the input voltage of grid-connected current closed-loop regulator, the output voltage i of grid-connected current closed-loop regulator
r2; The output voltage i of current sensor
lfas the input signal of duty-cycle loss computing module, be used for computed duty cycle and lose big or small respective signal i
r1; By i
r1with i
r2summation obtains the sinusoidal modulation signal i of high-frequency chain inverter
r; By signal i
ras switching tube, drive the input signal of signal conditioner, and switching tube drives the driving signal u of signal conditioner output switch pipe S1-S12
s1～u
s12.
Signal corresponding to signal conditioner in Fig. 1 modulated schematic diagram as shown in Figure 2, by conditioned signal i
rtake absolute value and obtain signal | i
r|, and will | i
r| as Sine Modulated high-frequency chain inverter switching tube, drive the modulation signal data of signal.In DSP digitial controller, signal modulation adopts 3 timer T1-T3 altogether, and these 3 timers synchronously increase, subtract timing, and the cycle is identical, i.e. T1PR=T2PR=T3PR, and T1, T2 are in the situation that increasing timing, and the value of corresponding comparand register is
CMP1R=0.5×i
r （1）
CMP2R=T2PR-0.5×i
r （2）
T1, T2 are in the situation that subtracting timing, and the value of corresponding comparand register is
CMP1D=T2PR-0.5×i
r （3）
CMP2D=0.5×i
r （4）
As shown in Figure 2, according to the modulator approach of (1)-(4) formula, obtain the driving signal of switching tube S1-S4, the output voltage u of the Sine Modulated high-frequency inverter obtaining
w1the high-frequency alternating current with the characteristic of sinusoidal wave rule variation.The value of the comparand register of timer T3 is half of its cycle, obtains the driving signal of switching tube S5-S8, for guaranteeing synchronous rectifier normal operation, must guarantee at u
w1voltage is timing, and the driving signal of switching tube S5 and S8 is high level, at u
w1when voltage is negative, the driving signal of switching tube S6 and S7 is high level; In the power frequency inverter of synchronous rectifier rear class, switching tube S9-S12 is operated in power frequency synchronous regime, and its power frequency change of current is by conditioned signal i
rpolarity determine, i
rpolarity is timing, and the driving signal of switching tube S9 and S12 remains high level, i
rwhen polarity is negative, the driving signal of switching tube S10 and S11 remains high level; Must note, according to the modulation of signal shown in Fig. 2 schematic diagram, the count value that time from switching tube S9, S12 to switching tube S10 and S11 occurs in timer T1-T3 is that periodic quantity obtains half, and now, transformer prime Sine Modulated high-frequency inverter output voltage is zero.
In the present invention, rectifier type high-frequency chain inverter is applied to grid-connected, realizes unity power factor during normal operation, i.e. inverter output voltage u
owith filter inductance current i
l1polarity only have two kinds of situations, respectively: 1. i
l>0, u
o>0; 2. i
l<0, u
o<0.Under both of these case, energy is all to flow to grid side from the DC side of input, and the unique difference of the mode of both of these case circuit working is the operating state of power frequency inverter, i
l>0, u
oduring >0, switching tube S9 and S12 are open-minded, i
l<0, u
oduring <0, switching tube S10 and S11 are open-minded.For the synchronous rectifier of prime and the operating state of Sine Modulated high-frequency inverter, both of these case is consistent.In view of the foregoing, below, only will the first working condition corresponding to the present invention be carried out to labor.
I
l>0, u
oduring >0, the waveform in a switch periods as shown in Figure 3, when analysis circuit specific works mode, need to be considered the leakage inductance L of transformer primary avris
rand the junction capacitance of switching tube S1-S4, therefore in corresponding mode figure, increased the leakage inductance L of transformer primary side winding
rjunction capacitance with switching tube S1-S4:
Switch mode 0[corresponding diagram 4]:
Switching tube S1 and switching tube S4 conducting, transformer primary side electric current is through S1, transformer leakage inductance L
r, transformer primary side winding and S4; Transformer secondary voltage is being for just, and secondary current is through the anti-and diode of switching tube S5, S8 in synchronous rectifier, and switching tube S9 and S12 in power frequency inverter.
Switch mode 1[corresponding diagram 5]:
T
0constantly, switching tube S1 turn-offs, the leakage inductance L of transformer
r, filter inductance L
1with the junction capacitance resonance of switching tube S1, S3, due to filter inductance L
1be worth very greatly, so switching tube S1 both end voltage is linear, rise, switching tube S3 both end voltage is linear to decline, so S1 is that no-voltage is turn-offed; The current path of transformer secondary is consistent with switch mode 0.
Switch mode 2[corresponding diagram 6]:
T
1constantly, the terminal voltage of switching tube S3 drops to 0, its anti-and diode no-voltage conducting, and transformer primary side voltage drop is 0, the variation of its current following transformer secondary current and changing; The current flowing path of transformer secondary is the same with switch mode 1.Attention: in this mode, t
2constantly, open S3, S3 is that no-voltage is open-minded; t
3constantly, the time that rectifier bridge switching tube S5, the S8 of transformer secondary circuit and switching tube S6, S7 have one section of overlapping conducting, but i
l>0, on the not impact of the switch mode of circuit.
Switch mode 3[corresponding diagram 7]:
T
4constantly, S4 turn-offs, the junction capacitance generation resonance of transformer primary side leakage inductance and switching tube S2 and S4, and the terminal voltage of S4 rises gradually, so S4 is that no-voltage is turn-offed.Once S4 turn-offs, it is negative that transformer voltage becomes, the anti-and diode current flow of the S6 of secondary, S7, and the anti-and diode of switching tube S5, S8 continues conducting, transformer secondary voltage u
w2again by clamper, be 0, the voltage of S4 junction capacitance acts on the leakage inductance L of transformer
rupper, the electric current of transformer primary side declines, and cause electric current in the anti-and diode of switching tube S5, S8 to decline, and in the anti-and diode of S6, S7, electric current rises gradually.In this stage, transformer primary polygonal voltage is less than zero, and transformer secondary voltage equals zero, and has caused the loss of duty ratio.
Switch mode 4[corresponding diagram 8]:
T
5constantly, the terminal voltage of S2 and S4 become respectively 0 with input voltage U
in, the anti-and diode current flow of S2.T
6constantly, transformer primary side electric current drops to 0.In this period of time, S2 is open-minded, so S2 no-voltage is open-minded.During this period of time, transformer secondary duty ratio continues to lose.
Switch mode 5[corresponding diagram 9]:
T
6constantly, transformer primary side electric current drops to 0, and two branch currents of transformer secondary side rectification circuit equate.After this primary current oppositely increases, but is not enough to provide completely load current, and in secondary circuit, the anti-and diode current of S6, S7 starts to be greater than the anti-also electric current of diode of S5, S8 of flowing through.During this period of time, transformer secondary duty ratio continues to lose.
The corresponding Figure 10 of switch mode 6[]:
T
7constantly, in secondary circuit, S5 is anti-and diode, and electric current becomes 0, filter inductance current i
lcomplete the conversion of and diode anti-to S6 from the anti-also diode of S5.From t
7constantly start, it is negative that transformer secondary voltage becomes, and duty-cycle loss stops.
T
8constantly, converter starts the work in second cycle, and analytic process is similar.
From above-mentioned mode figure, can find out, from moment t
2to moment t
7with respect to former limit winding voltage, there is duty-cycle loss phenomenon in transformer secondary output voltage, as the Δ d in Fig. 3, in high-frequency chain inverter of the present invention, in the inverter of Sine Modulated in transformer primary side circuit, realize, therefore, this duty-cycle loss will have influence on the quality of high-frequency chain inverter output waveform, makes to contain in output voltage a large amount of harmonic waves.For improving the output voltage quality of high-frequency chain inverter of the present invention, the special duty-cycle loss computing module that increases in DSP, calculated value is added in the output signal of power network current adjuster and is gone, the voltage distortion causing to compensate duty-cycle loss, thus cause the decline of grid-connected current quality.The size of duty-cycle loss computing module output signal is:
In formula, K is that transformer primary side umber of turn is than upper secondary umber of turn, T
sfor the switch periods of high-frequency chain inverter, T1PR is the digit period of timer T1.After the output signal stack of the offset shown in formula (5) and grid-connected current closed-loop regulator, as the reference signal of Sine Modulated, can effectively reduce the harmonic wave of inverter output voltage, greatly improve the quality of grid-connected current.
In sum, the present invention adopts three bridge circuits to realize the conversion to alternating current by direct current, compares with traditional high-frequency chain inverter, has saved all larger DC filter of volume and weight; In the inverter of Sine Modulated in transformer primary side circuit, carry out, can realize synchronous rectifier rear class inverter and only adopt power frequency switch motion, reduced switching loss; In addition, in synchronous rectifier and power frequency inverter, all switching tubes have all been realized zero voltage switch, have further reduced the loss of high-frequency chain inverter; Utilize duty-cycle loss computing module, do not increasing on the basis of hardware cost, improved the quality of high-frequency chain inverter output voltage waveforms.Therefore the present invention has volume, weight is little, and efficiency is high, and heat radiation requires low, the advantage that grid-connected current quality is high.
Claims (4)
1. an output Digital Modulation circuit for rectifier type High Frequency Link combining inverter, is characterized in that: comprise input voltage U
in, Sine Modulated high-frequency chain inverter, high-frequency isolation transformer, synchronous rectifier, LCL filter.
2. the output Digital Modulation circuit of rectifier type High Frequency Link combining inverter as claimed in claim 1, is characterized in that:
Described Sine Modulated high-frequency chain inverter comprises band anti-also the first switching tube, second switch pipe, the 3rd switching tube and the 4th switching tube of diode, the source electrode of the first switching tube is connected with the drain electrode of the 3rd switching tube, the source electrode of second switch pipe is connected with the drain electrode of the 4th switching tube, and the drain electrode of the first switching tube connects the drain electrode of second switch pipe, the source electrode of the 3rd switching tube connects the source electrode of the 4th switching tube; The positive pole of input power is connected between the drain electrode of the first switching tube and the drain electrode of second switch pipe; The negative pole of input power is connected between the source electrode of the 3rd switching tube and the source electrode of the 4th switching tube;
Synchronous rectifier comprises band anti-also the 5th switching tube, the 6th switching tube, the 7th switching tube and the 8th switching tube of diode, the emitter of the 5th switching tube is connected with the collector electrode of the 7th switching tube, the emitter of the 6th switching tube is connected with the collector electrode of the 8th switching tube, and the collector electrode of the 5th switching tube connects the collector electrode of the 6th switching tube, the emitter of the 7th switching tube connects the emitter of the 8th switching tube;
High-frequency isolation transformer comprises former limit winding and secondary winding, wherein transformer primary side winding is two terminals, be respectively the first terminal, the second terminal, transformer secondary winding also has two terminals, be respectively the 3rd terminal, the 4th terminal, wherein transformer the first terminal is connected between the source electrode of the first switching tube and the drain electrode of the 3rd switching tube, and transformer the second connecting terminals is connected between the source electrode of second switch pipe and the drain electrode of the 4th switching tube; Transformer the 3rd connecting terminals is connected between the emitter of the 5th switching tube and the collector electrode of the 7th switching tube, and transformer the 4th connecting terminals is connected between the emitter of the 6th switching tube and the collector electrode of the 8th switching tube;
Power frequency inverter comprises the 9th switching tube, the tenth switching tube, the 11 switching tube and the twelvemo pass pipe of the anti-also diode of band, the emitter of the 9th switching tube is connected with the collector electrode of the 11 switching tube, the emitter of the tenth switching tube is connected with the collector electrode that twelvemo is closed pipe, and the collector electrode of the 9th switching tube connects the collector electrode of the tenth switching tube, the emitter of the 11 switching tube connects the emitter that twelvemo is closed pipe.In addition,, in synchronous rectifier and power frequency inverter, the collector electrode of the collector electrode of the collector electrode of the 5th switching tube, the 6th switching tube, the collector electrode of the 9th switching tube, the tenth switching tube interconnects; The emitter that the emitter of the 7th switching tube, the 8th emitter of switching tube, the emitter of the 11 switching tube, twelvemo are closed pipe interconnects;
One end of the first inductance and the 9th emitter of switching tube in LCL filter are, the collector electrode of the 11 switching tube links together, and the other end of the first inductance is connected with one end of one end of filter capacitor and the second inductance; The other end of the second inductance is connected with the live wire of electrical network; The collector electrode that the emitter of the other end of filter capacitor and electrical network zero line, the tenth switching tube and twelvemo are closed pipe links together.
3. a numerical control system for rectifier type High Frequency Link combining inverter, is characterized in that: comprise voltage sensor, current sensor and DSP digitial controller; Wherein DSP digitial controller comprises that phase-locked loop, subtracter, duty-cycle loss calculating, grid-connected current adjuster, adder and signal conditioner form;
The input of voltage sensor is connected to the two ends of above-mentioned electrical network, and current sensor input and described the first inductance are in series;
The input of the output termination phase-locked loop of voltage sensor, the positive input terminal of the output termination subtracter of phase-locked loop, the output of current sensor is connected to the negative input end of subtracter and the input of duty-cycle loss computing module, the input of the output termination grid-connected current adjuster of subtracter, two inputs of adder connect respectively the output of duty-cycle loss computing module and the output of grid-connected current adjuster, the first terminal of the output termination signal conditioner of adder, the second terminal of signal conditioner is exported the first switching tube, second switch pipe, the driving signal of the 3rd switching tube and the 4th switching tube, the 3rd terminal output the 5th switching tube of signal conditioner, the 6th switching tube, the driving signal of the 7th switching tube and the 8th switching tube, the 4th terminal output the 9th switching tube of signal conditioner, the tenth switching tube, the 11 switching tube and twelvemo are closed the driving signal of pipe.
4. the numerical control system of rectifier type High Frequency Link combining inverter as claimed in claim 2, is characterized in that:
First adopt the feedback signal of voltage sensor senses line voltage, utilize digital phase-locked loop to obtain the fiducial value of the grid-connected current of synchronizeing with line voltage, the amplitude of this fiducial value obtains according to the maximal power tracing point of generation of electricity by new energy device; Adopt current sensor to detect the first filter inductance current feedback signal, by phase-locked loop gained reference signal and the first inductor current feedback signal subtraction, obtain grid-connected current error signal, the input signal using grid-connected current error signal as grid-connected current adjuster; Owing to there being the loss of duty ratio in main circuit, for obtaining high-quality output waveform, according to the size of inverter output current estimation duty-cycle loss, be then added with grid-connected current regulator output signal, so can greatly improve the output quality of grid-connected current.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986317A (en) * | 2014-05-29 | 2014-08-13 | 深圳市英可瑞科技开发有限公司 | Filter circuit with power frequency output |
| CN105610290A (en) * | 2016-01-19 | 2016-05-25 | 南京航空航天大学 | Marine low-noise asynchronous motor system, control system and control method |
| CN106981995A (en) * | 2017-04-24 | 2017-07-25 | 华北电力大学 | The minute design method of high frequency transformer voltage, current transfer ratio |
| CN108448898A (en) * | 2018-03-29 | 2018-08-24 | 合肥工业大学 | LLC based on phase shifting angle feedforward is without sensor synchronous rectification control method |
| WO2023155044A1 (en) * | 2022-02-15 | 2023-08-24 | 华为技术有限公司 | Near-field-communication system and control method therefor, and electronic device |
| CN116683774A (en) * | 2023-06-08 | 2023-09-01 | 苏州恩易浦科技有限公司 | Micro inverter, control method thereof and photovoltaic system comprising micro inverter |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071948A (en) * | 2007-03-29 | 2007-11-14 | 上海大学 | High-efficiency single-phase and three-phase grid-connected generating system |
| CN101820230A (en) * | 2010-02-26 | 2010-09-01 | 韩新建 | High-frequency isolation type grid-connected inverter |
| US20130170266A1 (en) * | 2011-12-30 | 2013-07-04 | National Tsing Hua University | Two-stage isolated dc/ac conversion circuit structure |
-
2013
- 2013-12-09 CN CN201310664249.8A patent/CN103618336B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101071948A (en) * | 2007-03-29 | 2007-11-14 | 上海大学 | High-efficiency single-phase and three-phase grid-connected generating system |
| CN101820230A (en) * | 2010-02-26 | 2010-09-01 | 韩新建 | High-frequency isolation type grid-connected inverter |
| US20130170266A1 (en) * | 2011-12-30 | 2013-07-04 | National Tsing Hua University | Two-stage isolated dc/ac conversion circuit structure |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986317A (en) * | 2014-05-29 | 2014-08-13 | 深圳市英可瑞科技开发有限公司 | Filter circuit with power frequency output |
| CN105610290A (en) * | 2016-01-19 | 2016-05-25 | 南京航空航天大学 | Marine low-noise asynchronous motor system, control system and control method |
| CN105610290B (en) * | 2016-01-19 | 2018-01-12 | 南京航空航天大学 | A kind of low noise Induction Motor System, control system and control method peculiar to vessel |
| CN106981995A (en) * | 2017-04-24 | 2017-07-25 | 华北电力大学 | The minute design method of high frequency transformer voltage, current transfer ratio |
| CN108448898A (en) * | 2018-03-29 | 2018-08-24 | 合肥工业大学 | LLC based on phase shifting angle feedforward is without sensor synchronous rectification control method |
| WO2023155044A1 (en) * | 2022-02-15 | 2023-08-24 | 华为技术有限公司 | Near-field-communication system and control method therefor, and electronic device |
| CN116683774A (en) * | 2023-06-08 | 2023-09-01 | 苏州恩易浦科技有限公司 | Micro inverter, control method thereof and photovoltaic system comprising micro inverter |
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