CN111431427A - MMHC energy storage converter - Google Patents
MMHC energy storage converter Download PDFInfo
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- CN111431427A CN111431427A CN202010452061.7A CN202010452061A CN111431427A CN 111431427 A CN111431427 A CN 111431427A CN 202010452061 A CN202010452061 A CN 202010452061A CN 111431427 A CN111431427 A CN 111431427A
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- energy storage
- capacitor
- controllable switch
- bridge circuit
- bridge
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides an MMHC energy storage converter which comprises an H-bridge module, wherein the H-bridge module comprises an H-bridge circuit and a composite absorption circuit, and the H-bridge circuit and the composite absorption circuit are connected in parallel. In the MMHC energy storage converter, due to the influence of line inductance, higher peak voltage can be generated between two input ends of an H-bridge circuit, meanwhile, the input voltage of the H-bridge circuit is changed constantly, and the composite absorption circuit can effectively restrain different frequency components of the peak voltage and reduce the voltage stress of the H-bridge circuit.
Description
Technical Field
The invention relates to the field of power electronic energy storage, in particular to an MMHC energy storage converter.
Background
The Modular Multilevel Hybrid Converter (MMHC) is a novel energy storage Converter suitable for battery echelon utilization, and outputs Multilevel direct-current high voltage after independent low-voltage battery units are connected in series through energy storage units and then is converted into Multilevel alternating-current voltage through an H-bridge circuit. The number of the energy storage units connected in series is large, the stray inductance of a line is large, the voltage spike is large when the H-bridge circuit works, and the amplitude of the direct-current voltage borne by the H-bridge circuit is constantly changed, so that the design of an absorption circuit of the H-bridge circuit is difficult, and the traditional absorption circuit is difficult to meet the requirements.
Disclosure of Invention
In order to solve the technical problem, the MMHC energy storage converter with the composite absorption circuit is provided, so that high voltage spikes can be effectively suppressed, and the heating problem caused by high-frequency charging and discharging of an absorption capacitor is avoided.
An MMHC energy storage converter comprises an H-bridge module, wherein the H-bridge module comprises an H-bridge circuit and a composite absorption circuit, and the H-bridge circuit and the composite absorption circuit are connected in parallel.
Preferably, the H-bridge circuit comprises a first controllable switch S1, a second controllable switch S2, a third controllable switch S3 and a fourth controllable switch S4, the collector of the first controllable switch S1 and the collector of the third controllable switch S3 are connected as a positive input terminal X1, the emitter of the second controllable switch S2 and the emitter of the fourth controllable switch S4 are connected as a negative input terminal X2, the emitter of the first controllable switch S1 and the collector of the second controllable switch S2 are connected as a first ac output terminal X3, and the emitter of the third controllable switch S3 and the collector of the fourth controllable switch S4 are connected as a second ac output terminal X4.
Preferably, the composite absorption circuit comprises a capacitor C, a diode D and a resistor R, an anode of the diode D is connected with an anode input terminal X1 of the H-bridge circuit, a cathode of the diode D is connected in series with the capacitor C and then connected to a cathode input terminal X2 of the H-bridge circuit, and the resistor R is connected in parallel with two ends of the capacitor C.
Preferably, the composite absorption circuit further comprises a second capacitor, and two ends of the second capacitor are respectively connected with the positive input end X1 and the negative input end X2 of the H-bridge circuit.
Preferably, the composite absorption circuit comprises a capacitor C, a resistor R and a second capacitor C2, wherein one end of the resistor R is connected with an anode input end X1 of the H-bridge circuit, the other end of the resistor R is connected with one end of the capacitor C, the other end of the capacitor C is connected with a cathode input end X2 of the H-bridge circuit, and two ends of the second capacitor C2 are respectively connected with an anode input end X1 and a cathode input end X2 of the H-bridge circuit.
Preferably, the invention also comprises an energy storage module, the output end of the energy storage module is connected with the input end of the H-bridge circuit,
the energy storage module comprises at least two groups of batteries and energy storage units, the batteries are connected with the input ends of the energy storage units, the output ends of the energy storage units are mutually connected in series to form the energy storage module, and the energy storage module is provided with a positive output end and a negative output end.
Preferably, the MMHC energy storage converter includes three energy storage modules, the H-bridge module includes three H-bridge circuits, one output ends of the H-bridge circuits are connected without being led out as a common connection end, and the other output ends of the three H-bridge circuits are used as three-phase output ends.
Compared with the prior art, the invention has the beneficial effects that: 1. through compound absorption circuit, can effectively restrain the different frequency components of peak voltage, reduce the voltage stress of H bridge circuit, avoid the problem of generating heat that absorption capacitor high frequency charge-discharge brought simultaneously.
Drawings
FIG. 1 is a single phase circuit configuration diagram of an MMHC converter;
FIG. 2 is a diagram of a single capacitor absorption circuit;
FIG. 3 is a diagram of a capacitor-resistor series absorption circuit;
FIG. 4 is a composite absorption circuit diagram of example 1;
FIG. 5 is a composite absorption circuit diagram of example 2;
fig. 6 is a composite absorption circuit diagram of example 3.
In the drawings, the reference numbers: 1-battery, 2-energy storage unit, 3-H bridge circuit, 4-composite absorption circuit.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
An MMHC energy storage converter comprises an H-bridge module, as shown in fig. 1 to 6, the H-bridge module comprises an H-bridge circuit 3 and a composite absorption circuit 4, and the H-bridge circuit and the composite absorption circuit are connected in parallel. In the MMHC energy storage converter, due to the influence of the line inductance, a high peak voltage is generated between the input terminals X1 and X2 of the H-bridge circuit 3, and meanwhile, the input voltage of the H-bridge circuit 3 changes constantly, so that the composite absorption circuit 4 can effectively suppress different frequency components of the peak voltage, reduce the voltage stress of the H-bridge circuit 3, and avoid the heating problem caused by high-frequency charging and discharging of the absorption capacitor.
The H-bridge circuit comprises a first controllable switch S1, a second controllable switch S2, a third controllable switch S3 and a fourth controllable switch S4, the collector of the first controllable switch S1 and the collector of the third controllable switch S3 are connected as a positive input terminal X1, the emitter of the second controllable switch S2 and the emitter of the fourth controllable switch S4 are connected as a negative input terminal X2, the emitter of the first controllable switch S1 and the collector of the second controllable switch S2 are connected as a first alternating current output terminal X3, and the emitter of the third controllable switch S3 and the collector of the fourth controllable switch S4 are connected as a second alternating current output terminal X4. The H-bridge circuit is used to convert an input dc voltage to an ac voltage. Wherein, the first controllable switch S1, the second controllable switch S2, the third controllable switch S3 and the fourth controllable switch S4 may be fully-controlled switches, such as IGBT or MOSFET switches.
Example 1
The composite absorption circuit comprises a capacitor C, a diode D and a resistor R, as shown in fig. 4, the anode of the diode D is connected with the anode input end X1 of the H-bridge circuit, the cathode of the diode D is connected with the capacitor C in series and then connected with the cathode input end X2 of the H-bridge circuit, and the resistor R is connected with the two ends of the capacitor C in parallel. The resistor R is used for consuming voltage peak energy absorbed by the absorption capacitor C, and due to the clamping effect of the diode D, the energy in the capacitor C is slowly released through the resistor R and cannot be quickly released into the H-bridge circuit, so that the voltage of the capacitor C is basically kept stable, the problems of loss and heating caused by frequent charging and discharging of the capacitor C are solved, and when the voltage peaks at two input ends of the H-bridge circuit exceed the voltage of the capacitor C, the diode D is switched on, so that the effect of absorbing the peak energy is achieved.
Example 2
Unlike embodiment 1, as shown in fig. 5, the composite absorption circuit further includes a second capacitor C2, and two ends of the second capacitor C2 are respectively connected to the positive input terminal X1 and the negative input terminal X2 of the H-bridge circuit. The diode D takes a certain time from turning off to turning on, the second capacitor C2 is used for absorbing the peak energy of the extremely high frequency, and the composite absorption circuit composed of the capacitor C, the diode D and the resistor R in the embodiment 1 is used for absorbing most of the rest peak energy.
Example 3
As shown in fig. 6, another structure of the composite absorption circuit: the high-voltage power supply comprises a capacitor C, a resistor R and a second capacitor C2, wherein one end of the resistor R is connected with an anode input end X1 of an H bridge circuit, the other end of the resistor R is connected with one end of the capacitor C, the other end of the capacitor C is connected with a cathode input end X2 of the H bridge circuit, and two ends of the second capacitor C2 are respectively connected with an anode input end X1 and a cathode input end X2 of the H bridge circuit. The method is favorable for reducing the cost and is suitable for occasions with smaller line inductance.
The single-phase circuit structure of the MMHC energy storage converter as shown in fig. 1 generates a high spike voltage between the dc input terminals X1 and X2 of the H-bridge circuit due to the influence of the line inductance. The single-capacitor absorption circuit is to connect a capacitor in parallel between the dc input terminals X1 and X2 of the H-bridge circuit to suppress the voltage spike, as shown in fig. 2. However, in the MMHC energy storage converter, the dc input voltage of the H-bridge circuit changes constantly, so that the capacitor is frequently charged and discharged, heat is generated seriously, and the capacitor is also easy to resonate with the line inductance to cause voltage and current oscillation. In order to suppress oscillation, a capacitor and a damping resistor can be connected in series and then connected in parallel to the input side of the H-bridge to form a capacitor-resistor series absorption circuit, as shown in fig. 3. However, not only does the resistance heat generation become serious, but also the absorption effect is deteriorated.
The invention can also comprise an energy storage module, as shown in fig. 1, the output end of the energy storage module is connected with the input end of the H-bridge circuit, the energy storage module comprises n groups of batteries 1 and energy storage units 2, the batteries 1 are connected with the input end of the energy storage unit 2, wherein n is a natural number greater than 2, the output ends of the energy storage units 2 are mutually connected in series to form the energy storage module, the energy storage module is provided with a positive output end and a negative output end, the positive output end is connected with a positive input end X1 of the H-bridge circuit, and the negative output end is connected with a negative input end X2 of the H-bridge circuit.
In a specific embodiment, the H-bridge module comprises three H-bridge circuits 3, the MMHC energy storage converter comprises three energy storage modules, one output end of the H-bridge circuit is connected without being led out as a common connection end, and the other output end of the three H-bridge circuits is used as a three-phase output end. The H-bridge module is used for converting the direct-current voltages of the three energy storage modules into three-phase alternating-current voltages.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (7)
1. An MMHC energy storage converter is characterized by comprising an H-bridge module, wherein the H-bridge module comprises an H-bridge circuit and a composite absorption circuit, and the H-bridge circuit and the composite absorption circuit are connected in parallel.
2. An MMHC energy storage converter according to claim 1, wherein the H-bridge circuit comprises a first controllable switch S1, a second controllable switch S2, a third controllable switch S3 and a fourth controllable switch S4, wherein the collector of the first controllable switch S1 and the collector of the third controllable switch S3 are connected as a positive input X1, the emitter of the second controllable switch S2 and the emitter of the fourth controllable switch S4 are connected as a negative input X2,
the emitter of the first controllable switch S1 and the collector of the second controllable switch S2 are connected as a first ac output X3,
the emitter of the third controllable switch S3 and the collector of the fourth controllable switch S4 are connected as a second ac output X4.
3. An MMHC energy storage converter according to claim 1 or 2, wherein the composite absorption circuit comprises a capacitor C, a diode D and a resistor R,
the anode of the diode D is connected with the anode input end X1 of the H-bridge circuit, the cathode of the diode D is connected with the capacitor C in series and then is connected with the cathode input end X2 of the H-bridge circuit,
the resistor R is connected in parallel with two ends of the capacitor C.
4. An MMHC energy storage converter according to claim 3, wherein the composite absorption circuit further comprises a second capacitor, and two ends of the second capacitor are respectively connected with the positive input terminal X1 and the negative input terminal X2 of the H-bridge circuit.
5. An MMHC energy storage converter according to claim 1 or 2, wherein the composite absorption circuit comprises a capacitor C, a resistor R and a second capacitor C2,
one end of the resistor R is connected with the anode input end X1 of the H-bridge circuit, the other end of the resistor R is connected with one end of the capacitor C, the other end of the capacitor C is connected with the cathode input end X2 of the H-bridge circuit,
and two ends of the second capacitor C2 are respectively connected with the positive input end X1 and the negative input end X2 of the H-bridge circuit.
6. An MMHC energy storage converter according to claim 1, further comprising an energy storage module, an output of the energy storage module being connected to an input of the H-bridge circuit,
the energy storage module comprises at least two groups of batteries and energy storage units, the batteries are connected with the input ends of the energy storage units, the output ends of the energy storage units are mutually connected in series to form the energy storage module, and the energy storage module is provided with a positive output end and a negative output end.
7. An MMHC energy storage converter according to claim 6, wherein the MMHC energy storage converter comprises three energy storage modules, the H-bridge modules comprise three H-bridge circuits, one output ends of the H-bridge circuits are connected without leading out as a common connection end, and the other output ends of the three H-bridge circuits are used as three-phase output ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010452061.7A CN111431427A (en) | 2020-05-26 | 2020-05-26 | MMHC energy storage converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010452061.7A CN111431427A (en) | 2020-05-26 | 2020-05-26 | MMHC energy storage converter |
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| CN111431427A true CN111431427A (en) | 2020-07-17 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541227A (en) * | 2021-04-06 | 2021-10-22 | 国网浙江省电力有限公司电力科学研究院 | Heterogeneous compatible topological structure |
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2020
- 2020-05-26 CN CN202010452061.7A patent/CN111431427A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113541227A (en) * | 2021-04-06 | 2021-10-22 | 国网浙江省电力有限公司电力科学研究院 | Heterogeneous compatible topological structure |
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