CN102938566A - Control method for Z source type two-switch grid-connected inverter - Google Patents
Control method for Z source type two-switch grid-connected inverter Download PDFInfo
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Abstract
The invention relates to a control method for a Z source type two-switch grid-connected inverter, belonging to the field of conversion of electrical energy. The control method is used for the grid-connected power generation of the renewable energy sources, such as the photovoltaic power generation. The Z source type two-switch grid-connected inverter comprises a direct current-side input-side diode, an impedance network, a single-phase bridge arm, an output-side filter, a main controller, an alternating voltage detecting circuit, a biasing circuit, a direct voltage detecting circuit and an insolating driving circuit, wherein a direct current capacitor in the impedance network is replaced with two capacitors in series connection, and a connecting point of the two capacitors in series connection is taken as an output end of an alternating current side, so that one bridge arm is omitted, therefore, the constant control of the direct voltage and the sinusoidal waveform control of the alternating current-side grid-connected electric current can be simultaneously realized only by two switch devices of one bridge arm according to a double-closed loop control strategy based on the closed-loop control of the direct voltage and the instantaneous waveform control of the grid-connected current by virtue of the shoot-through state of the inverter. The control method has the advantages of compact structure, low cost, high efficiency, high reliability and the like.
Description
Technical field
The present invention relates to the control method of a kind of Z source type two switching grid-connected inverters, belong to the transformation of electrical energy field, for generating electricity by way of merging two or more grid systems of the regenerative resources such as photovoltaic generation.
Background technology
At present, the shortage of the energy and problem of environmental pollution are day by day serious, renewable energy power generation technology take wind power generation, photovoltaic generation as representative because of its do not consume earth fossil energy, to advantages such as environment zero discharges, become the approach of the most competitive solution energy and environmental problem, obtain extensive concern, become current study hotspot.
Because the electric energy form of renewable energy source output is more responsive to environmental change, it is larger to fluctuate, and needs to obtain in conjunction with corresponding transformation of electrical energy technology the DC voltage of the satisfied condition that is incorporated into the power networks for this reason.In present solution, for photovoltaic generating system, it is output as the direct current form, and a kind of scheme is to adopt the two-stage type structure of DC-to-DC-interchange to realize stably AC energy output.The switch converters that DC side increases in this structure causes system loss to increase, and efficient and reliability all descend to some extent.
Another kind of scheme is to adopt Z source type inverter, the intersection impedance network that serial connection is comprised of two inductance and electric capacity in the middle of DC generation source and conventional inverter, utilize the pass-through state of inverter that inductance is carried out energy storage, discharge in non-pass-through state, and then indirectly realize the boosting rectifier control of direct voltage.In existing scheme, for single phase system, adopt two brachium pontis, namely four power devices cause loss larger, and cost is higher, remains further to be carried out performance optimization.
Summary of the invention
The object of the present invention is to provide the control method of a kind of Z source type two switching grid-connected inverters, for generating electricity by way of merging two or more grid systems of the regenerative resources such as photovoltaic generation, solve low, the complex structure and other problems of efficient of the combining inverter in the existing regenerative resource grid-connected system.
A kind of Z source type two switching grid-connected inverters, its composition comprises the diode of direct-flow positive pole input, inductance
L1, electric capacity
C1, electric capacity
C2, electric capacity
C3, inductance
L2, single-phase brachium pontis, filter;
The positive pole of described diode links to each other with the cathode output end of external dc power, as electrode input end, diode and the inductance of described Z source type two switching grid-connected inverters
L1 an end and electric capacity
CAn end of 1 links to each other, inductance
L1 the other end and electric capacity
CAn end of 2 and the electrode input end of single-phase brachium pontis link to each other, electric capacity
C1 the other end and the negative input of single-phase brachium pontis and inductance
LAn end of 2 links to each other, electric capacity
C2 the other end and electric capacity
CAn end of 3 links to each other, and links to each other electric capacity as an ac output end of described Z source type two switching grid-connected inverters with one of electrical network
C3 the other end and inductance
L2 the other end and the cathode output end of external dc power link to each other, direct current negative input as described Z source type two switching grid-connected inverters, the ac output end of single-phase brachium pontis links to each other with an end of filter, and another links to each other the other end of filter as another ac output end and electrical network of described Z source type two switching grid-connected inverters;
The input of power grid voltage detection circuit (9) links to each other with single-phase electrical network, for detection of line voltage, the output of power grid voltage detection circuit (9) links to each other with the input of circuit for generating synchronous signals (10), produce the square-wave signal with the line voltage identical polar, the output of circuit for generating synchronous signals (10) links to each other with the first input end of master controller (12), the input of grid-connected current testing circuit (11) is serially connected with between filter inductance (8) and the electrical network, for detection of grid-connected current, the output of grid-connected current testing circuit (11) links to each other with the second input of master controller (12), input and the electric capacity of direct voltage testing circuit (13)
CTwo ends 1(3) link to each other, for detection of electric capacity
CDirect voltage 1(3), the output of direct voltage testing circuit (13) links to each other with the 3rd input of master controller (12), the output of master controller (12) links to each other with the input of isolated drive circuit (14), the output of isolated drive circuit (14) links to each other with the signal input part of single-phase brachium pontis (7), is used for driving two power device work of single-phase brachium pontis (7);
The control method of described Z source type two switching grid-connected inverters adopts the direct voltage sampling module to gather the DC input voitage of single-phase brachium pontis, adopts the direct current voltage regulator control capacitance
C1 direct voltage, adopt the grid-connected current detection module to gather grid-connected current, adopt the network voltage detection module to gather line voltage, adopt phase-locked loop module to calculate electric network voltage phase, adopt the sine value computing module to calculate the sine value of electric network voltage phase, use the current closed-loop control module that grid-connected current is controlled, each switching tube that adopts the Sine Wave Pulse Width Modulation algorithm that adds pass-through state to produce in the pulse-width signal control inverter is worked;
The step of the control method of described Z source type two switching grid-connected inverters is,
Step 1, electric capacity is set
CThe set-point of 1 direct voltage is with the electric capacity of direct voltage sampling module collection
C1 d. c. voltage signal subtracts each other, and the difference of acquisition obtains the straight-through duty ratio of single-phase brachium pontis by direct current voltage regulator, to realize electric capacity
CThe constant control of 1 direct voltage;
Step 3, the set-point of grid-connected current amplitude is set, the sine value of the real-time phase of the line voltage that obtains with step 2 multiplies each other, and obtains the instantaneous set-point of grid-connected current;
Step 4, adopt the grid-connected current detection module to gather grid-connected current, the instantaneous set-point of the grid-connected current that collects and the grid-connected current of step 3 acquisition is input to the current closed-loop control module, obtain the set-point of the output voltage of single-phase brachium pontis;
The set-point of the output voltage of the inverter that step 5, the straight-through duty ratio that step 1 is obtained and step 4 obtain is input to the Sine Wave Pulse Width Modulation algorithm that adds pass-through state and produces pulse-width signal and control each switching tube work in the single-phase brachium pontis, thereby realizes the closed-loop control of grid-connected current.
The advantage that the present invention has: the present invention is by replacing with the dc capacitor of two series connection at a dc capacitor with the impedance network in the Z-source inverter, and connects some an output as AC, and then saved a brachium pontis.Because the present invention only adopts a brachium pontis, i.e. two device for power switching and just realized simultaneously the boosting of direct voltage, voltage stabilizing control and the generated energy of energy source is transported in the electrical network with unity power factor in conjunction with the closed loop control algorithm of direct voltage closed loop control algorithm and grid-connected current, therefore compare with existing scheme have compact conformation, efficient is high, high reliability.
Description of drawings
Fig. 1 is the schematic diagram of Z of the present invention source type two switching grid-connected inverters;
Fig. 2 is the schematic diagram of control method of the present invention;
Fig. 3 is the flow chart of control method of the present invention;
Fig. 4 is the schematic diagram of the SPWM of generation pass-through state of the present invention.
Embodiment
Specify present embodiment below in conjunction with Fig. 1 to Fig. 4.A kind of Z source type two switching grid-connected inverters, its composition comprises the diode of direct-flow positive pole input, inductance
L1, electric capacity
C1, electric capacity
C2, electric capacity
C3, inductance
L2, single-phase brachium pontis, filter;
The positive pole of described diode links to each other with the cathode output end of external dc power, as electrode input end, diode and the inductance of described Z source type two switching grid-connected inverters
L1 an end and electric capacity
CAn end of 1 links to each other, inductance
L1 the other end and electric capacity
CAn end of 2 and the electrode input end of single-phase brachium pontis link to each other, electric capacity
C1 the other end and the negative input of single-phase brachium pontis and inductance
LAn end of 2 links to each other, electric capacity
C2 the other end and electric capacity
CAn end of 3 links to each other, and links to each other electric capacity as an ac output end of described Z source type two switching grid-connected inverters with one of electrical network
C3 the other end and inductance
L2 the other end and the cathode output end of external dc power link to each other, direct current negative input as described Z source type two switching grid-connected inverters, the ac output end of single-phase brachium pontis links to each other with an end of filter, and another links to each other the other end of filter as another ac output end and electrical network of described Z source type two switching grid-connected inverters;
The input of power grid voltage detection circuit (9) links to each other with single-phase electrical network, for detection of line voltage, the output of power grid voltage detection circuit (9) links to each other with the input of circuit for generating synchronous signals (10), produce the square-wave signal with the line voltage identical polar, the output of circuit for generating synchronous signals (10) links to each other with the first input end of master controller (12), the input of grid-connected current testing circuit (11) is serially connected with between filter inductance (8) and the electrical network, for detection of grid-connected current, the output of grid-connected current testing circuit (11) links to each other with the second input of master controller (12), input and the electric capacity of direct voltage testing circuit (13)
CTwo ends 1(3) link to each other, for detection of electric capacity
CDirect voltage 1(3), the output of direct voltage testing circuit (13) links to each other with the 3rd input of master controller (12), the output of master controller (12) links to each other with the input of isolated drive circuit (14), the output of isolated drive circuit (14) links to each other with the signal input part of single-phase brachium pontis (7), is used for driving two power device work of single-phase brachium pontis (7).Its median filter can be filter inductance, also can be the combining form of inductance and electric capacity.
Fig. 1 is the schematic diagram of Z of the present invention source type two switching grid-connected inverters, below its operation principle of brief analysis.By the operation principle of Z source converter as can be known, when the bridge arm direct pass of inverter, stored energy is in inductance, when brachium pontis returns to normal condition, the energy of storage is on the one hand to capacitor charging, and on the other hand to the AC power supply, and then the boosting inverter of realizing electric capacity and direct current are to the conversion that exchanges.The ratio of dc capacitor voltage and DC input voitage, be DC boosting than with the ratio of the time of leading directly to and whole switch periods, be monotonic relationshi between the straight-through duty ratio namely, it is larger namely to lead directly to duty ratio, DC boosting therefore just can control capacitance voltage by the straight-through duty ratio of control than larger.
As the above analysis, can control VD by the straight-through duty ratio of control inverter brachium pontis, i.e. the input voltage of inverter.The present invention is on the basis of existing scheme, DC side is intersected a electric capacity in the impedance network (being comprised of with electric capacity inductance) be replaced by the electric capacity of the identical mutual series connection of two appearance values, the magnitude of voltage at the tie point place of the electric capacity of such two series connection is half of whole direct voltage, in addition, in the existing scheme, for single phase system, two brachium pontis have been adopted, four device for power switching, the present invention with the tie point of above-mentioned two series capacitances as an ac output end, save like this a brachium pontis, only needed a brachium pontis can realize the output of alternating voltage.Consider that this application of installation is in the regenerative resource grid-connected system, for example dc power supply is photovoltaic cell, because the fluctuation of the output voltage of photovoltaic cell is larger, if it is not controlled, on the one hand the grid-connected current waveform quality is impacted, when photovoltaic cell voltage is low, will not satisfy the voltage constraints that is incorporated into the power networks on the other hand, the power delivery that photovoltaic cell can't be sent is gone to public electric wire net.Therefore the present invention is in type two switching grid-connected inverters of Z source, adopt two closed loop control methods of direct voltage closed-loop control and grid-connected current closed-loop control, the control of the grid-connected current of combining inverter mainly realizes two functions, one is that grid-connected current is controlled to sine wave, to reduce the harmonic pollution to electrical network, another function is that grid-connected current is controlled to and the line voltage same-phase, so that do not comprise reactive current in the grid-connected current, improves the operational efficiency of system.Its control principle drawing as shown in Figure 2, control flow is analyzed as follows.
The control method of described Z source type two switching grid-connected inverters adopts the direct voltage sampling module to gather the DC input voitage of single-phase brachium pontis, adopts the direct current voltage regulator control capacitance
C1 direct voltage, adopt the grid-connected current detection module to gather grid-connected current, adopt the network voltage detection module to gather line voltage, adopt phase-locked loop module to calculate electric network voltage phase, adopt the sine value computing module to calculate the sine value of electric network voltage phase, use the current closed-loop control module that grid-connected current is controlled, each switching tube that adopts the Sine Wave Pulse Width Modulation algorithm that adds pass-through state to produce in the pulse-width signal control inverter is worked;
The step of the control method of described Z source type two switching grid-connected inverters is,
Step 1, electric capacity is set
CThe set-point of 1 direct voltage is with the electric capacity of direct voltage sampling module collection
C1 d. c. voltage signal subtracts each other, and the difference of acquisition obtains the straight-through duty ratio of single-phase brachium pontis by direct current voltage regulator, to realize electric capacity
CThe constant control of 1 direct voltage;
Step 3, the set-point of grid-connected current amplitude is set, the sine value of the real-time phase of the line voltage that obtains with step 2 multiplies each other, and obtains the instantaneous set-point of grid-connected current;
Step 4, adopt the grid-connected current detection module to gather grid-connected current, the instantaneous set-point of the grid-connected current that collects and the grid-connected current of step 3 acquisition is input to the current closed-loop control module, obtain the set-point of the output voltage of single-phase brachium pontis;
The set-point of the output voltage of the inverter that step 5, the straight-through duty ratio that step 1 is obtained and step 4 obtain is input to the Sine Wave Pulse Width Modulation algorithm that adds pass-through state and produces pulse-width signal and control each switching tube work in the single-phase brachium pontis, thereby realizes the closed-loop control of grid-connected current.
Wherein, direct current voltage regulator in the step 1 and the equal adoption rate of the current closed-loop control module in the step 4-integral control algorithm, phase-locked loop module adopts the software phase-lock-loop algorithm of existing scheme to get final product in the step 2, can obtain the phase place of line voltage by the instantaneous value that gathers line voltage, instantaneous reactive power theory for example, virtual rotating coordinate system method, structure orthogonal signalling algorithm etc.
Among the present invention, need to realize simultaneously the normal inversion control of each device for power switching of inverter and produce pass-through state, the Sine Wave Pulse Width Modulation strategy (SPWM) of present embodiment in the existing scheme is for basic, because two device for power switching of the brachium pontis in the SPWM method are in complementary conduction mode, in each carrier cycle, all can switch twice on off state, therefore when the state of two device for power switching of brachium pontis switches, pressure allows the simultaneously conductings of two device for power switching, and its ON time equals the product of straight-through duty ratio and carrier cycle.Its specific works principle is, a triangular wave is set, given and the triangle wave with inverter voltage, if inverter voltage is given greater than triangular wave, output " 1 ", if sine wave is less than or equal to triangular wave, then output " 0 ", form first via square-wave signal, described first via square-wave signal is carried out the logic negate, obtain the second road square-wave signal, the first via square-wave signal that obtains is judged, if jump to " 0 " by " 1 ", or jump to " 1 " by " 0 ", then take the level trip point of the first via square-wave signal that obtained as starting point, in the two-way square-wave signal that obtains, add simultaneously the full one state of a period of time, the time of the full one state of this section equals the product in straight-through duty ratio and the triangular wave cycle that sets, thus obtained two-way square-wave signal, the first via are used for the upper pipe of first brachium pontis of control and the lower pipe of second brachium pontis, and the second the tunnel is used for the lower pipe of first brachium pontis of control and the upper pipe of second brachium pontis.Fig. 3 has provided the schematic diagram of the control signal of control procedure generation, and wherein the full one state of two paths of signals can make two equal conductings of switching tube of same brachium pontis, namely produces pass-through state.
Above-mentioned all algorithms, comprise the closed-loop control of VD, the control of grid-connected current and all realizations in master controller (12) of SPWM algorithm that comprise pass-through state, each electric quantity signal is input in the master controller (12), by the control signal of corresponding algorithm generation inverter, pass through again each switching device that isolated drive circuit (14) is used for control inverter.Master controller (12) need to be chosen as with analog to digital converter, the single-chip microcomputer of the peripheral hardwares such as pulse width modulation module, the controllers such as digital signal processor.
Claims (1)
1. Z source type two switching grid-connected inverters, its composition comprises the diode of direct-flow positive pole input, inductance
L1, electric capacity
C1, electric capacity
C2, electric capacity
C3, inductance
L2, single-phase brachium pontis, filter;
The positive pole of described diode links to each other with the cathode output end of external dc power, as electrode input end, diode and the inductance of described Z source type two switching grid-connected inverters
L1 an end and electric capacity
CAn end of 1 links to each other, inductance
L1 the other end and electric capacity
CAn end of 2 and the electrode input end of single-phase brachium pontis link to each other, electric capacity
C1 the other end and the negative input of single-phase brachium pontis and inductance
LAn end of 2 links to each other, electric capacity
C2 the other end and electric capacity
CAn end of 3 links to each other, and links to each other electric capacity as an ac output end of described Z source type two switching grid-connected inverters with one of electrical network
C3 the other end and inductance
L2 the other end and the cathode output end of external dc power link to each other, direct current negative input as described Z source type two switching grid-connected inverters, the ac output end of single-phase brachium pontis links to each other with an end of filter, and another links to each other the other end of filter as another ac output end and electrical network of described Z source type two switching grid-connected inverters;
The input of power grid voltage detection circuit (9) links to each other with single-phase electrical network, for detection of line voltage, the output of power grid voltage detection circuit (9) links to each other with the input of circuit for generating synchronous signals (10), produce the square-wave signal with the line voltage identical polar, the output of circuit for generating synchronous signals (10) links to each other with the first input end of master controller (12), the input of grid-connected current testing circuit (11) is serially connected with between filter inductance (8) and the electrical network, for detection of grid-connected current, the output of grid-connected current testing circuit (11) links to each other with the second input of master controller (12), input and the electric capacity of direct voltage testing circuit (13)
CTwo ends 1(3) link to each other, for detection of electric capacity
CDirect voltage 1(3), the output of direct voltage testing circuit (13) links to each other with the 3rd input of master controller (12), the output of master controller (12) links to each other with the input of isolated drive circuit (14), the output of isolated drive circuit (14) links to each other with the signal input part of single-phase brachium pontis (7), is used for driving two power device work of single-phase brachium pontis (7);
The control method of described Z source type two switching grid-connected inverters is characterized in that, adopts the direct voltage sampling module to gather the DC input voitage of single-phase brachium pontis, adopts the direct current voltage regulator control capacitance
C1 direct voltage, adopt the grid-connected current detection module to gather grid-connected current, adopt the network voltage detection module to gather line voltage, adopt phase-locked loop module to calculate electric network voltage phase, adopt the sine value computing module to calculate the sine value of electric network voltage phase, use the current closed-loop control module that grid-connected current is controlled, each switching tube that adopts the Sine Wave Pulse Width Modulation algorithm that adds pass-through state to produce in the pulse-width signal control inverter is worked;
The step of the control method of described Z source type two switching grid-connected inverters is,
Step 1, electric capacity is set
CThe set-point of 1 direct voltage is with the electric capacity of direct voltage sampling module collection
C1 d. c. voltage signal subtracts each other, and the difference of acquisition obtains the straight-through duty ratio of single-phase brachium pontis by direct current voltage regulator, to realize electric capacity
CThe constant control of 1 direct voltage;
Step 2, employing network voltage detection module gather line voltage, higher line voltage is converted to lower voltage signal, the mains voltage signal that gathers is input to phase-locked loop module, obtain the real-time phase of line voltage, with the real-time phase input sine value computing module of described line voltage, obtain the sine value of the real-time phase of line voltage again;
Step 3, the set-point of grid-connected current amplitude is set, the sine value of the real-time phase of the line voltage that obtains with step 2 multiplies each other, and obtains the instantaneous set-point of grid-connected current;
Step 4, adopt the grid-connected current detection module to gather grid-connected current, the instantaneous set-point of the grid-connected current that collects and the grid-connected current of step 3 acquisition is input to the current closed-loop control module, obtain the set-point of the output voltage of single-phase brachium pontis;
The set-point of the output voltage of the inverter that step 5, the straight-through duty ratio that step 1 is obtained and step 4 obtain is input to the Sine Wave Pulse Width Modulation algorithm that adds pass-through state and produces pulse-width signal and control each switching tube work in the single-phase brachium pontis, thereby realizes the closed-loop control of grid-connected current.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104158224A (en) * | 2014-09-02 | 2014-11-19 | 哈尔滨工业大学（威海） | Control algorithm for grid-connected/off-grid switch of Z source inverter |
| CN104518659A (en) * | 2015-01-26 | 2015-04-15 | 中国人民解放军国防科学技术大学 | Control method for bidirectional DC-DC converter based on Z source |
| CN104953615A (en) * | 2015-06-12 | 2015-09-30 | 国家电网公司 | Unified controller and control method of single-stage Z-source photovoltaic grid-connected inverter |
| CN107070273A (en) * | 2017-06-19 | 2017-08-18 | 广东工业大学 | A kind of multiport converter and new energy resources system based on five terminal impedance networks |
| CN108667076A (en) * | 2018-07-25 | 2018-10-16 | 河南城建学院 | The Z-source inverter grid-connection control device controlled based on active disturbance rejection and ratio resonance |
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- 2012-12-13 CN CN2012104069505A patent/CN102938566A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158224A (en) * | 2014-09-02 | 2014-11-19 | 哈尔滨工业大学（威海） | Control algorithm for grid-connected/off-grid switch of Z source inverter |
| CN104518659A (en) * | 2015-01-26 | 2015-04-15 | 中国人民解放军国防科学技术大学 | Control method for bidirectional DC-DC converter based on Z source |
| CN104518659B (en) * | 2015-01-26 | 2015-11-18 | 中国人民解放军国防科学技术大学 | Based on the control method of the bidirectional DC-DC converter in Z source |
| CN104953615A (en) * | 2015-06-12 | 2015-09-30 | 国家电网公司 | Unified controller and control method of single-stage Z-source photovoltaic grid-connected inverter |
| CN107070273A (en) * | 2017-06-19 | 2017-08-18 | 广东工业大学 | A kind of multiport converter and new energy resources system based on five terminal impedance networks |
| CN107070273B (en) * | 2017-06-19 | 2020-02-21 | 广东工业大学 | Multiport converter based on five-terminal impedance network and new energy system |
| CN108667076A (en) * | 2018-07-25 | 2018-10-16 | 河南城建学院 | The Z-source inverter grid-connection control device controlled based on active disturbance rejection and ratio resonance |
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Application publication date: 20130220 |