CN105140966A - Modulation strategy for suppressing non-isolated photovoltaic system leakage current - Google Patents
Modulation strategy for suppressing non-isolated photovoltaic system leakage current Download PDFInfo
- Publication number
- CN105140966A CN105140966A CN201510656641.7A CN201510656641A CN105140966A CN 105140966 A CN105140966 A CN 105140966A CN 201510656641 A CN201510656641 A CN 201510656641A CN 105140966 A CN105140966 A CN 105140966A
- Authority
- CN
- China
- Prior art keywords
- switch
- bridge
- minded
- turn
- represent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention relates to a modulation strategy for suppressing non-isolated photovoltaic system leakage current. The technical characteristics are that the modulation strategy comprises the following steps that an H-bridge cascaded photovoltaic system is divided into a first-half period working mode and a second-half period working mode. Inverter output voltage is 0, -Vpv and -2Vpv under the first-half period working mode, the lower level switch state is maintained to be unchanged, a switch S21 and a switch S24 are turned off, and a switch S23 and a switch S22 are turned on. Inverter output voltage is 0, +Vpv and +2Vpv under the second-half period working mode, the upper level switch state is maintained to be unchanged, a switch S11 and a switch S14 are turned on, and a switch S13 and a switch S12 are turned off. An H-bridge cascaded multilevel inverter acts as the base, and half of the number of the required carriers is reduced in comparison with that of a conventional modulation strategy starting from the modulation strategy without changing the system structure or increasing system cost so that calculation amount is greatly reduced. Besides, common-mode voltage is controlled within a certain range so that an effect of suppressing leakage current is achieved.
Description
Technical field
The invention belongs to technical field of photovoltaic power generation, especially a kind of modulation strategy suppressing non-isolation type photovoltaic system leakage current.
Background technology
Photovoltaic generating system is due to the cost of its great number, and the energy resource making photovoltaic gross generation common relative to other is less.Reduce photovoltaic system cost, raise the efficiency and become crucial, wherein a kind of method reduced costs is exactly do not use transformer, because non-isolation type photovoltaic DC-to-AC converter and electrical network are without electrical isolation, can be formed and there is more low-impedance leakage current circulating path, the leakage current produced not only can cause the problems such as the distortion of electromagnetic interference, grid-connected current, also can work the mischief to equipment and personal safety simultaneously.The method of domestic and international solution non-isolation type inverter output common mode current problems mainly contains hardware approach and software approach two class.Hardware approach carrys out filtering common mode voltage by increasing filter at inverter output end, or adopt the topological structure improved, this class methods shortcoming is: add the volume and weight that hardware adds inverter, Control System Design is complicated, need to redesign the parameter of filter used or transformer simultaneously, reduce the reliability of system.Software approach is started with from control strategy, when not increasing other elements, adopts the pulse modulation technology be applicable to reduce common mode current.
H bridge cascaded multilevel inverter circuit is made up of multiple two level H-bridge inverter structure units in series, this inverter has flexible design, is easy to modularization, easily the DC power supply of expansion, DC side separate, be more suitable for high power, high voltage circuit, inverter output level number can be more flexible etc. plurality of advantages, based on These characteristics, HB-CMI is applied in relatively high power photovoltaic parallel in system has certain advantage.As adopted software to suppress non-isolation type photovoltaic system leakage current to be problem in the urgent need to address at present based on how H bridge cascaded multilevel inverter circuit.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of modulation strategy of reasonable in design, efficiency is high, cost is low suppression non-isolation type photovoltaic system leakage current is provided.
The present invention solves its technical problem and takes following technical scheme to realize:
Suppress a modulation strategy for non-isolation type photovoltaic system leakage current, H bridge tandem photovoltaic system be divided into first half cycle operating mode and later half cycle operating mode, and process in the steps below:
Step 1, first half cycle operating mode
Under first half cycle operating mode, inverter output voltage is 0 ,-Vpv and-2Vpv, and wherein, subordinate's on off state remains unchanged, switch S
21and switch S
24turn off, switch S
23and switch S
22open-minded, consider the on off state of higher level H bridge, the relation of carrier wave and modulating wave is divided into three kinds:
(1) V is worked as
1>V
ref<V
2time, switch S
11and switch S
14open-minded, switch S
13and switch S
12turn off, V
a1N1=V
pv, V
b1N1=0, V
a1b1=+V
pv, V
a2b2=-V
pv;
(2) V is worked as
1>V
ref>V
2time, switch S
14and switch S
12open-minded, switch S
11and switch S
13turn off, V
a1N1=0, V
b1N1=0, V
a1b1=0, V
a2b2=-V
pv;
(3) V is worked as
1<V
ref>V
2time, switch S
13and switch S
12open-minded, switch S
11and switch S
14turn off, V
a1N1=0, V
b1N1=+V
pv, V
a1b1=-V
pv, V
a2b2=-V
pv;
Step 2, later half cycle operating mode
Under later half cycle operating mode, inverter output voltage is 0 ,+Vpv and+2Vpv, and wherein higher level's on off state remains unchanged, switch S
11and switch S
14open-minded, switch S
13and switch S
12turn off, only consider the on off state of subordinate H bridge, the relation of carrier wave and modulating wave is divided into three kinds:
(1) V is worked as
1>V
ref<V
2time, switch S
23and switch S
22open-minded, switch S
21and switch S
24turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=+V
pv, V
a2b2=-V
pv;
(2) V is worked as
1>V
ref>V
2time, switch S
21and switch S
23open-minded, switch S
24and switch S
22turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=+V
pv, V
a2b2=0;
(3) V is worked as
1<V
ref>V
2time, switch S
21and switch S
24open-minded, switch S
23and switch S
22turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=0, V
a2b2=+V
pv;
Wherein, V
1and V
2represent the carrier voltage after modulation respectively, V
pvrepresent photovoltaic battery panel output voltage, V
refrepresent the modulation voltage after modulation, V
a1N1, V
b1N1represent higher level H bridge brachium pontis mid point a respectively
1, b
1to reference point N
1voltage, V
a2N2, V
b2N2represent subordinate H bridge brachium pontis mid point a respectively
2, b
2to reference point N
2voltage, V
a1b1, V
a2b2represent higher level's H bridge and subordinate H bridge brachium pontis mid point a
1, b
1and a
2, b
2between voltage, switch S
11, S
14, S
13, S
12represent each switch element of higher level H bridge, S
21, S
24, S
23,s
22represent each switch element of subordinate H bridge.
And described H bridge tandem photovoltaic system is two unit H bridge tandem photovoltaic systems.
Advantage of the present invention and good effect are:
1, the present invention is based on H bridge cascaded multilevel inverter, do not change system configuration, do not increase system cost prerequisite under, from modulation strategy, make wanted carrier number comparatively conventional modulated strategy decrease half, greatly reduce amount of calculation, and make common-mode voltage control in certain scope, reach the effect suppressing leakage current.
2, the present invention is based on inverter without transformer, and its system configuration is simple, efficiency is high, volume is little, cost is low.
3, the present invention selects H bridge cascaded multilevel inverter, and it has flexible design, is more suitable for high power, high voltage circuit, inverter output voltage flexibly, is conducive to filter volume and reduces.
Accompanying drawing explanation
Fig. 1 is H bridge cascaded multilevel inverter circuit diagram;
Fig. 2 is schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the embodiment of the present invention is further described:
Suppressing a modulation strategy for non-isolation type photovoltaic system leakage current, is there is leakage problem for non-isolation type photovoltaic system, under the prerequisite not changing system configuration, adopts software approach, proposes a kind of control method suppressing leakage current.Because traditional modulation strategy can not suppress leakage current preferably, and the carrier wave needed for conventional modulated strategy increases along with cascaded inverter unit and increases, and also can increase amount of calculation.The present invention with two unit H bridge tandem photovoltaic systems for research object, as shown in Figure 1, and carry out improving on the basis of conventional modulated strategy obtaining a kind of new modulation strategy, as shown in Figure 2, V1 and V2 represents the carrier wave improving rear modulation technique respectively, and carrier wave is all more than zero axle, the present invention propose modulation strategy under on off state and common-mode voltage as shown in table 1.
Table 1
Below the modulation strategy of this suppression non-isolation type photovoltaic system leakage current is described further:
Fig. 1 gives two unit H bridge tandem photovoltaic systems, is divided into upper and lower two H-bridge unit, L
1, L
2for filter inductance, each H-bridge unit is analyzed, can obtain according to Kirchhoff's law:
V
cm+V
a1N1-V
s-V
ac＝0(1)
V
cm+V
b1N1+V
s-V
a2b2＝0(2)
Because line voltage does not almost affect leakage current, therefore ignore V
ac, equation (1) and (2) are added:
2V
cm+V
a1N1+V
b1N1-V
a2b2＝0(3)
And then the equation obtaining common-mode voltage is:
The present invention propose modulation strategy as shown in Figure 2, under this modulation strategy, on off state and common-mode voltage as shown in table 1, be divided into two mode of operations: front half period and later half cycle.
1, the front half period (0-T/2)
In such a mode, inverter output voltage is 0 ,-Vpv ,-2Vpv, and wherein subordinate's on off state remains unchanged, S
21, S
24turn off, S
23, S
22open-minded, only consider the on off state of higher level H bridge, the relation of carrier wave and modulating wave is divided into three kinds:
(1) V is worked as
1>V
ref<V
2time, switch S
11and switch S
14open-minded, switch S
13and switch S
12turn off, V
a1N1=V
pv, V
b1N1=0, V
a1b1=+V
pv, V
a2b2=-V
pv;
(2) V is worked as
1>V
ref>V
2time, switch S
14and switch S
12open-minded, switch S
11and switch S
13turn off, V
a1N1=0, V
b1N1=0, V
a1b1=0, V
a2b2=-V
pv;
(3) V is worked as
1<V
ref>V
2time, switch S
13and switch S
12open-minded, switch S
11and switch S
14turn off, V
a1N1=0, V
b1N1=+V
pv, V
a1b1=-V
pv, V
a2b2=-V
pv.
2, the later half cycle (T/2-T)
In such a mode, inverter output voltage is 0 ,+Vpv ,+2Vpv, and wherein higher level's on off state remains unchanged, and switch S 11, S14 is open-minded, and S13, S12 turn off, and only consider the on off state of subordinate H bridge, the relation of carrier wave and modulating wave is divided into three kinds:
(1) V is worked as
1>V
ref<V
2time, switch S
23and switch S
22open-minded, switch S
21and switch S
24turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=+V
pv, V
a2b2=-V
pv;
(2) V is worked as
1>V
ref>V
2time, switch S
21and switch S
23open-minded, switch S
24and switch S
22turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=+V
pv, V
a2b2=0;
(3) V is worked as
1<V
ref>V
2time, switch S
21and switch S
24open-minded, switch S
23and switch S
22turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=0, V
a2b2=+V
pv.
V in above-mentioned formula
1and V
2represent the carrier voltage after modulation respectively, V
pvrepresent photovoltaic battery panel output voltage, V
refrepresent the modulation voltage after modulation, V
a1N1, V
b1N1represent higher level H bridge brachium pontis mid point a respectively
1, b
1to reference point N
1voltage, V
a2N2, V
b2N2represent subordinate H bridge brachium pontis mid point a respectively
2, b
2to reference point N
2voltage, V
a1b1, V
a2b2represent higher level's H bridge and subordinate H bridge brachium pontis mid point a
1, b
1and a
2, b
2between voltage, switch S
11, S
14, S
13, S
12represent each switch element of higher level H bridge, S
21, S
24, S
23,s
22represent each switch element of subordinate H bridge.
Can find out from the above analysis, the maximum changing value of common-mode voltage is V
pv/ 2, thus common mode variations is limited in certain scope, reach the effect suppressing leakage current.
In order to verify the correctness of above-mentioned modulation strategy, we are simulation model based on PSIM emulation platform building, and simulation parameter is as follows: unit photovoltaic panel capacity 1kW, the equal and V of unit direct voltage
dc=120V, parasitic capacitance C
pv=100nF, output inductor L=1.8mH, triangular carrier frequency is 3kHz, and the sinusoidal wave frequency of modulating wave is 50Hz, and line voltage is 240V/50Hz, and the system emulation time is 0.06s, and simulation step length is 100ns.Simulation result is as shown in table 2, PD (phasedisposition), APO (alternativephaseopposition), PO (phaseopposition) represents three kinds of traditional modulation strategies, be respectively homophase carrier modulation, adjacent carrier back-modulation, reverse carrier modulation.
Table 2 leakage current effective value, inverter output voltage THD and variable number
Result shows, wanted carrier number of the present invention decreases half.
It is emphasized that; embodiment of the present invention is illustrative; instead of it is determinate; therefore the present invention includes the embodiment be not limited to described in embodiment; every other execution modes drawn by those skilled in the art's technical scheme according to the present invention, belong to the scope of protection of the invention equally.
Claims (2)
1. suppress a modulation strategy for non-isolation type photovoltaic system leakage current, it is characterized in that: H bridge tandem photovoltaic system is divided into first half cycle operating mode and later half cycle operating mode, and process in the steps below:
Step 1, first half cycle operating mode
Under first half cycle operating mode, inverter output voltage is 0 ,-Vpv and-2Vpv, and wherein, subordinate's on off state remains unchanged, switch S
21and switch S
24turn off, switch S
23and switch S
22open-minded, consider the on off state of higher level H bridge, the relation of carrier wave and modulating wave is divided into three kinds:
(1) V is worked as
1>V
ref<V
2time, switch S
11and switch S
14open-minded, switch S
13and switch S
12turn off, V
a1N1=V
pv, V
b1N1=0, V
a1b1=+V
pv, V
a2b2=-V
pv;
(2) V is worked as
1>V
ref>V
2time, switch S
14and switch S
12open-minded, switch S
11and switch S
13turn off, V
a1N1=0, V
b1N1=0, V
a1b1=0, V
a2b2=-V
pv;
(3) V is worked as
1<V
ref>V
2time, switch S
13and switch S
12open-minded, switch S
11and switch S
14turn off, V
a1N1=0, V
b1N1=+V
pv, V
a1b1=-V
pv, V
a2b2=-V
pv;
Step 2, later half cycle operating mode
Under later half cycle operating mode, inverter output voltage is 0 ,+Vpv and+2Vpv, and wherein higher level's on off state remains unchanged, switch S
11and switch S
14open-minded, switch S
13and switch S
12turn off, only consider the on off state of subordinate H bridge, the relation of carrier wave and modulating wave is divided into three kinds:
(1) V is worked as
1>V
ref<V
2time, switch S
23and switch S
22open-minded, switch S
21and switch S
24turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=+V
pv, V
a2b2=-V
pv;
(2) V is worked as
1>V
ref>V
2time, switch S
21and switch S
23open-minded, switch S
24and switch S
22turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=+V
pv, V
a2b2=0;
(3) V is worked as
1<V
ref>V
2time, switch S
21and switch S
24open-minded, switch S
23and switch S
22turn off, V
a1N1=V
pv, V
b1N1=0, V
a2N2=+V
pv, V
b2N2=0, V
a2b2=+V
pv;
Wherein, V
1and V
2represent the carrier voltage after modulation respectively, V
pvrepresent photovoltaic battery panel output voltage, V
refrepresent the modulation voltage after modulation, V
a1N1, V
b1N1represent higher level H bridge brachium pontis mid point a respectively
1, b
1to reference point N
1voltage, V
a2N2, V
b2N2represent subordinate H bridge brachium pontis mid point a respectively
2, b
2to reference point N
2voltage, V
a1b1, V
a2b2represent higher level's H bridge and subordinate H bridge brachium pontis mid point a
1, b
1and a
2, b
2between voltage, switch S
11, S
14, S
13, S
12represent each switch element of higher level H bridge, S
21, S
24, S
23,s
22represent each switch element of subordinate H bridge.
2. a kind of modulation strategy suppressing non-isolation type photovoltaic system leakage current according to claim 1, is characterized in that: described H bridge tandem photovoltaic system is two unit H bridge tandem photovoltaic systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510656641.7A CN105140966B (en) | 2015-10-12 | 2015-10-12 | A kind of modulation strategy for suppressing non-isolation type photovoltaic system leakage current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510656641.7A CN105140966B (en) | 2015-10-12 | 2015-10-12 | A kind of modulation strategy for suppressing non-isolation type photovoltaic system leakage current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105140966A true CN105140966A (en) | 2015-12-09 |
| CN105140966B CN105140966B (en) | 2017-06-06 |
Family
ID=54726223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510656641.7A Active CN105140966B (en) | 2015-10-12 | 2015-10-12 | A kind of modulation strategy for suppressing non-isolation type photovoltaic system leakage current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105140966B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450059A (en) * | 2015-12-22 | 2016-03-30 | 合肥工业大学 | Modulation method for suppressing leakage current of two-H-bridge cascaded inverter |
| CN105610343A (en) * | 2016-03-07 | 2016-05-25 | 合肥工业大学 | Modulation method for inhibiting leakage current of H-bridge cascade inverters |
| CN106100413A (en) * | 2016-08-22 | 2016-11-09 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges five-electrical level inverter |
| CN106130333A (en) * | 2016-08-03 | 2016-11-16 | 西安电子科技大学 | Drain current suppressing method based on cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106208782A (en) * | 2016-07-20 | 2016-12-07 | 合肥工业大学 | Cascaded H-bridges photovoltaic inverter leakage current suppressing method based on Model Predictive Control |
| CN106208643A (en) * | 2016-08-03 | 2016-12-07 | 西安电子科技大学 | Based on the common mode current suppressing method under the non-equal illumination of photovoltaic combining inverter |
| CN106208654A (en) * | 2016-08-22 | 2016-12-07 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106253733A (en) * | 2016-08-26 | 2016-12-21 | 合肥工业大学 | Two H bridge photovoltaic inverter leakage current suppressing method based on modified model carrier wave stacking |
| CN106301054A (en) * | 2016-08-31 | 2017-01-04 | 西安电子科技大学 | A kind of modified model POD modulation strategy of cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106921175A (en) * | 2017-03-24 | 2017-07-04 | 燕山大学 | A kind of single-phase non-isolated current source photovoltaic combining inverter and control method |
| CN110445442A (en) * | 2019-07-02 | 2019-11-12 | 华夏天信智能物联股份有限公司 | A kind of three-phase cascade connection type three-level inverter control method |
| CN115622376A (en) * | 2022-11-16 | 2023-01-17 | 西安奇点能源股份有限公司 | Cascade type energy storage converter system with function of inhibiting leakage current and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010028975A (en) * | 2008-07-18 | 2010-02-04 | Toshiba Carrier Corp | Power supply unit |
| CN102097966A (en) * | 2011-02-14 | 2011-06-15 | 东南大学 | Cascade megawatt photovoltaic grid-connected inverter |
| CN103828217A (en) * | 2011-08-31 | 2014-05-28 | 奥普蒂斯丁技术公司 | DC-AC inverter for photovoltaic systems |
| US20150103575A1 (en) * | 2013-10-11 | 2015-04-16 | Delta Electronics, Inc. | Solar photovoltaic power conversion system and method of operating the same |
-
2015
- 2015-10-12 CN CN201510656641.7A patent/CN105140966B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010028975A (en) * | 2008-07-18 | 2010-02-04 | Toshiba Carrier Corp | Power supply unit |
| CN102097966A (en) * | 2011-02-14 | 2011-06-15 | 东南大学 | Cascade megawatt photovoltaic grid-connected inverter |
| CN103828217A (en) * | 2011-08-31 | 2014-05-28 | 奥普蒂斯丁技术公司 | DC-AC inverter for photovoltaic systems |
| US20150103575A1 (en) * | 2013-10-11 | 2015-04-16 | Delta Electronics, Inc. | Solar photovoltaic power conversion system and method of operating the same |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105450059A (en) * | 2015-12-22 | 2016-03-30 | 合肥工业大学 | Modulation method for suppressing leakage current of two-H-bridge cascaded inverter |
| CN105610343A (en) * | 2016-03-07 | 2016-05-25 | 合肥工业大学 | Modulation method for inhibiting leakage current of H-bridge cascade inverters |
| CN105610343B (en) * | 2016-03-07 | 2018-04-03 | 合肥工业大学 | Suppress the modulator approach of H bridge cascaded inverter leakage currents |
| CN106208782A (en) * | 2016-07-20 | 2016-12-07 | 合肥工业大学 | Cascaded H-bridges photovoltaic inverter leakage current suppressing method based on Model Predictive Control |
| CN106130333A (en) * | 2016-08-03 | 2016-11-16 | 西安电子科技大学 | Drain current suppressing method based on cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106208643A (en) * | 2016-08-03 | 2016-12-07 | 西安电子科技大学 | Based on the common mode current suppressing method under the non-equal illumination of photovoltaic combining inverter |
| CN106208654A (en) * | 2016-08-22 | 2016-12-07 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106100413A (en) * | 2016-08-22 | 2016-11-09 | 西安电子科技大学 | A kind of drain current suppressing method being applied to cascaded H-bridges five-electrical level inverter |
| CN106253733A (en) * | 2016-08-26 | 2016-12-21 | 合肥工业大学 | Two H bridge photovoltaic inverter leakage current suppressing method based on modified model carrier wave stacking |
| CN106301054A (en) * | 2016-08-31 | 2017-01-04 | 西安电子科技大学 | A kind of modified model POD modulation strategy of cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106301054B (en) * | 2016-08-31 | 2019-07-05 | 西安电子科技大学 | A kind of modified POD modulation strategy of cascaded H-bridges photovoltaic DC-to-AC converter |
| CN106921175A (en) * | 2017-03-24 | 2017-07-04 | 燕山大学 | A kind of single-phase non-isolated current source photovoltaic combining inverter and control method |
| CN106921175B (en) * | 2017-03-24 | 2020-01-07 | 燕山大学 | Single-phase non-isolated current source photovoltaic grid-connected inverter and control method |
| CN110445442A (en) * | 2019-07-02 | 2019-11-12 | 华夏天信智能物联股份有限公司 | A kind of three-phase cascade connection type three-level inverter control method |
| CN115622376A (en) * | 2022-11-16 | 2023-01-17 | 西安奇点能源股份有限公司 | Cascade type energy storage converter system with function of inhibiting leakage current and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105140966B (en) | 2017-06-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105140966A (en) | Modulation strategy for suppressing non-isolated photovoltaic system leakage current | |
| CN106787707B (en) | Embedded energy storage type multi-module tandem photovoltaic direct current boost converter and application method | |
| CN201918915U (en) | DC (direct current)-AC (alternating current) convertor | |
| CN103001511B (en) | Voltage converter and operating method thereof | |
| CN103532420B (en) | Dual-three-level online-topology switchable inverter | |
| CN102709941A (en) | Control method of quasi-Z source cascade multi-level single-phase photovoltaic grid generation system | |
| CN102629836B (en) | Novel two-stage alternating-current photovoltaic module | |
| CN104753377A (en) | Multilevel inverter based on bridge modular switched capacitor | |
| CN205195587U (en) | Grid -connected PV converter, photovoltaic power supply system and electrical apparatus | |
| CN104410310A (en) | Neutral point clamped H-bridge photovoltaic inverter and method for inhibiting common mode leakage current | |
| CN108205595B (en) | PSCAD double-fed wind turbine simulation model system suitable for harmonic analysis | |
| CN201947196U (en) | Photovoltaic grid-connected inverter based on maximum power point tracking | |
| CN105337520A (en) | Photovoltaic grid-connected converter, photovoltaic power supply system and electric appliance | |
| CN103178734A (en) | Photovoltaic inverter | |
| CN103312210A (en) | Three-phase four-wire type three-level photovoltaic grid-connected inverter | |
| CN105958855A (en) | New-type high-gain quasi-Z-source inverter | |
| CN110071652B (en) | Low-leakage-current five-switch non-isolated single-phase photovoltaic grid-connected inverter and grid-connected system | |
| CN107196548A (en) | Three-phase high-gain Buck Boost integrated form boosting inverters | |
| CN104201717A (en) | Permanent magnet direct-driven wind power system | |
| CN104158427A (en) | Single-phase non-transformer isolation-type Z-source photovoltaic grid-connected inverter and modulation method | |
| CN201898331U (en) | Step up/down DC AFC | |
| CN105471300A (en) | H5-D type non-isolated photovoltaic grid-connected inverter and modulation method therefor | |
| CN203251237U (en) | Three-phase four-wire type three-level photovoltaic grid-connected inverter | |
| CN102916447A (en) | Photovoltaic grid-connected power generation and supply device | |
| CN203504448U (en) | Photovoltaic micro inverter based on staggered cycle PWM modulation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |