CN113098307A - Series-parallel hybrid multilevel converter with energy storage function and dual phase-shifting PWM control method - Google Patents
Series-parallel hybrid multilevel converter with energy storage function and dual phase-shifting PWM control method Download PDFInfo
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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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1807—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators
- H02J3/1814—Arrangements for adjusting, eliminating or compensating reactive power in networks using series compensators wherein al least one reactive element is actively controlled by a bridge converter, e.g. unified power flow controllers [UPFC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02M7/493—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 the static converters being arranged for operation in parallel
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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a series-parallel hybrid multilevel converter with energy storage and a dual phase-shifting PWM control method. The power units are connected in parallel to form a parallel group, the parallel groups are sequentially connected in series to form a single-phase electric loop, one end of the single-phase electric loop is connected with the corresponding phase of the power grid, and the other end of the single-phase electric loop is connected with the public ends of other two phases as a public end. The invention adopts a hybrid connection mode of parallel connection and series connection of modular power units to realize the multiplication of the capacity of the converter, but the converter externally embodies the characteristic of a single voltage source converter, thereby avoiding the problem of high difficulty in dynamic balance control when a plurality of voltage source converters are connected in parallel.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a series-parallel hybrid multilevel converter with energy storage and a dual phase-shifting PWM control method.
Background
In the field of medium-high voltage high-power reactive compensation and energy storage, the cascaded H-bridge multi-level topology is widely applied due to the advantages of low harmonic content, low switching frequency, no need of directly connecting switching devices in series and the like. However, in the application occasion with the capacity exceeding 10MVA, on one hand, the limitation of the switching device is limited, a single cascaded H-bridge multilevel converter cannot meet the capacity requirement, and a plurality of converters are required to be connected in parallel to expand the capacity; on the other hand, corresponding to energy storage application, after the capacity of a single H-bridge power unit is enlarged, the parallel connection quantity of the configured energy storage batteries is correspondingly increased.
When multiple converters are applied in parallel, the problem of output balance of each converter needs to be solved, and particularly in the transient process of a power grid, the dynamic output of the parallel converters cannot achieve an ideal balance effect, so that the dynamic support capability is weak. When a novel power system taking new energy as main energy is constructed, large-capacity active and reactive dynamic support equipment needs to be configured to maintain the stability of system operation, so that a new topological scheme needs to be researched to improve the capacity of a single cascaded H-bridge multilevel converter.
For energy storage application, the more the number of the batteries connected in parallel directly is, the more the overall characteristics of the batteries are affected by the unit with poor characteristics in the parallel group, and the increase of the capacity of a single H bridge is bound to be accompanied by the increase of the number of the batteries connected in parallel directly, so that the overall performance of the energy storage system is affected.
At present, the technology of the hybrid cascade H bridge is in the hybrid series layer of the H bridges with different structures, and does not help to improve the whole capacity, but the structure of the traditional H bridge unit does not have the parallel capability and is difficult to be applied in parallel.
Disclosure of Invention
The technical purpose is as follows: aiming at the defects in the prior art, the invention discloses a series-parallel hybrid multilevel converter with energy storage and a dual phase-shifting PWM control method, wherein a hybrid connection mode of parallel connection and series connection of modular power units is adopted to realize the multiplication of the capacity of the converter, but the converter externally embodies the characteristic of a single voltage source type converter, and the problem of high difficulty in dynamic balance control when a plurality of voltage source type converters are connected in parallel is solved.
The technical scheme is as follows: in order to achieve the technical purpose, the invention adopts the following technical scheme.
A series-parallel hybrid multilevel converter with energy storage function is characterized in that three phases of the multilevel converter adopt the same topological structure, each phase of the topological structure mainly comprises a plurality of modular power units which are connected in parallel and then connected in series, wherein the plurality of power units are connected in parallel to form a parallel group, the plurality of parallel groups are sequentially connected in series to form a single-phase electric loop, one end of the single-phase electric loop is used as one of the three phases of the multilevel converter and is connected with the three phases corresponding to a power grid, and the other end of the single-phase electric loop is used as a public end and is connected with the public ends of the other two phases of the multilevel.
Preferably, the parallel group comprises at least two modular power units, and the number of the modular power units in the parallel group is determined by the actual capacity requirement of the multilevel converter.
Preferably, the plurality of parallel groups are sequentially connected in series to form a single-phase electric circuit, and the series connection number is determined by the voltage grade applied by the multi-level converter.
Preferably, the modular power unit comprises a converter, a filter reactor and an energy storage battery pack; the direct current side of the converter is connected with an energy storage battery pack; one end of the alternating current side of the converter is connected with a filter reactor in series to form an output end-1 which is used as one of three phases of the multilevel converter and is connected with three phases corresponding to a power grid, and the other end of the alternating current side of the converter is used as an output end-2 which is used as a public end and is connected with the public ends of the other two phases of the multilevel converter.
Preferably, the output ends-1 and 2 of the modular power units in the same-stage parallel group are connected with each other; the modular power units are connected in series, and the output end-2 of the previous stage is connected with the output end-1 of the next stage.
Preferably, the converter is an H-bridge converter, a half-bridge converter or a hybrid H-bridge half-bridge converter, and the H-bridge converter adopts a two-level H-bridge converter or a three-level H-bridge converter.
Preferably, in the connection of the direct current side of the converter and the energy storage battery pack, the direct current side of the converter is directly connected with the energy storage battery pack or connected with the energy storage battery pack through a DC/DC converter.
Preferably, the other end of the alternating current side of the converter is used as an output end-2 and comprises: the other end of the alternating current side of the converter is directly used as an output end-2 or used as an output end-2 after passing through a series filter reactor.
A dual phase-shifting PWM control method of a series-parallel hybrid multilevel converter with energy storage is applied to any one of the series-parallel hybrid multilevel converters with energy storage, and is characterized in that: the three phases of the multilevel converter adopt the same topological structure, each phase of the topological structure mainly comprises a plurality of modular power units in a mixed mode of firstly connecting in parallel and then connecting in series, the phase of a triangular carrier wave is simultaneously shifted in the serial direction and the parallel direction, double phase shifting is realized, the triangular carrier wave is compared with a sine modulation wave to generate a plurality of PWM control signals, and the modular power units are respectively driven in a one-to-one correspondence mode.
Preferably, the angle of phase shift of the triangular carrier in the serial direction and the parallel direction is: the m modularized power units are connected in parallel to the power unit groups, the n power unit groups are connected in series to form a single-phase cascade topology, the triangular wave is sequentially shifted by 2 pi/n phase angles in the serial direction and sequentially shifted by 2 pi/m phase angles in the parallel direction, and double phase shifting is formed.
Has the advantages that:
1. the cascaded H-bridge multilevel converter provided by the invention adopts a hybrid connection mode of parallel connection and series connection of modular power units to realize the multiplication of the capacity of the converter, but the converter externally presents the characteristic of a single voltage source type converter, thereby avoiding the problem of high difficulty in dynamic balance control when a plurality of voltage source type converters are connected in parallel; the modular power unit is provided with a filtering reactor, and a high-voltage filtering reactor is not required to be configured outside; the direct current sides of the power units in the parallel group are independent of each other, and the charging and discharging of the energy storage batteries can be controlled respectively, so that the performance loss of the parallel use of a large number of batteries is reduced;
2. the invention adopts carrier double phase-shift PWM control, and makes the switching ripples of each module power unit mutually offset through phase shift, thereby obviously reducing the harmonic content of the total current and improving the electric energy quality of the equipment.
Drawings
FIG. 1 is a schematic diagram of a series-parallel hybrid cascaded H-bridge multilevel converter of the present invention;
FIG. 2 is a schematic diagram of a two-level modular power unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a 2-to-3 series hybrid cascaded H-bridge multilevel converter string according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a three-level modular power unit according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a DC/DC two-level modular power unit according to an embodiment of the present invention;
fig. 6 is a schematic diagram of PWM control using an H-bridge multi-level converter according to an embodiment of the present invention.
Detailed Description
The invention is further explained and explained with reference to the drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
A series-parallel hybrid multilevel converter with energy storage function is characterized in that three phases of the multilevel converter adopt the same topological structure, each phase of the topological structure mainly comprises a plurality of modular power units which are connected in parallel and then connected in series, wherein the plurality of power units are connected in parallel to form a parallel group, the plurality of parallel groups are sequentially connected in series to form a single-phase electric loop, one end of the single-phase electric loop is used as one of the three phases of the multilevel converter and is connected with three phases corresponding to a power grid, and the other end of the single-phase electric loop is used as a public end and is connected with the public ends of the other two phases of the multilevel.
The parallel group comprises at least two modular power units, the number of the modular power units in the parallel group is determined by the actual capacity requirement of the multi-level converter, and the parallel number is increased along with the increase of the capacity requirement of equipment. The series number of the series connection is determined by the voltage grade applied by the multilevel converter, specifically, the higher the voltage grade is, the higher the series connection grade is, which is the same as that of a common cascade multilevel converter, for example, about 8 grades in a 6kV system, about 12 grades in a 10kV system, and about 42 grades in a 35kV system.
The modularized power unit comprises a converter, a filter reactor and an energy storage battery pack; the direct current side of the converter is connected with an energy storage battery pack; one end of the alternating current side of the converter is connected with the filter reactor in series to form an output end-1, the output end-1 serves as one of three phases of the multi-level converter and is connected with three phases corresponding to a power grid, the other end of the alternating current side of the converter directly serves as an output end-2 or serves as an output end-2 after passing through the filter reactor in series, and the output end-2 serves as a public end and is connected with public ends of the other two phases of the multi-level converter. The output ends-1 and 2 of the modular power units in the same-stage parallel group are connected with each other; the modular power units are connected in series, and the output end-2 of the previous stage is connected with the output end-1 of the next stage. The invention adopts a series-parallel hybrid mode, improves the capacity level of the existing cascade converter, simultaneously limits the capacity of the energy storage battery unit and improves the utilization rate of the battery. In addition, the inductance of the filter reactor is determined according to the ripple current requirement, the smaller the ripple current index requirement is, the larger the inductance is, and the specific numerical value can be determined through simulation.
The modular power units have parallel capacity by adding the filter reactor, the alternating current output side of the power unit of the traditional cascaded multilevel converter is the port of the IGBT, when two power units are connected in parallel, if the driving signals of the two power units are inconsistent, the problem of short circuit between the direct current sides of the two power units can occur, so that equipment can not run, even the IGBT is damaged by overcurrent, the filter reactor in the power unit plays a role in inhibiting current, the problem of short circuit between the direct current sides is avoided, and meanwhile, the effect of balancing current among the parallel units can be played because the size of the filter reactor of each power unit is the same.
The converter is an H-bridge converter, a half-bridge converter or a hybrid H-bridge half-bridge converter, and the H-bridge converter adopts a two-level H-bridge converter or a three-level H-bridge converter.
The double phase-shifting PWM control method of the series-parallel hybrid multilevel converter with the energy storage is applied to any one of the series-parallel hybrid multilevel converters with the energy storage, the three phases of the multilevel converter adopt the same topological structure, each phase of the topological structure mainly comprises a plurality of modular power units which are connected in parallel and then connected in series, the phase of a triangular carrier wave is shifted in the series direction and the parallel direction simultaneously, the double phase shifting is realized, and the angle of the triangular carrier wave for shifting the phase in the series direction and the parallel direction simultaneously is as follows: the m modularized power units are connected in parallel to the power unit groups, the n power unit groups are connected in series to form a single-phase cascade topology, the triangular wave is sequentially shifted by 2 pi/n phase angles in the serial direction and sequentially shifted by 2 pi/m phase angles in the parallel direction, and double phase shifting is formed. The triangular carrier wave is compared with the sine modulation wave to generate a plurality of PWM control signals, and the PWM control signals respectively drive the modular power units in a one-to-one correspondence mode.
The invention adopts carrier double phase-shift PWM control, and makes the switching ripples of each module power unit mutually offset through phase shift, thereby obviously reducing the harmonic content of the total current and improving the electric energy quality of the equipment.
The cascaded H-bridge multilevel converter provided by the invention adopts a hybrid connection mode of parallel connection and series connection of modular power units to realize the multiplication of the capacity of the converter, but the converter externally presents the characteristic of a single voltage source type converter, thereby avoiding the problem of high difficulty in dynamic balance control when a plurality of voltage source type converters are connected in parallel; the modular power unit is provided with a filtering reactor, a high-voltage filtering reactor does not need to be configured outside, the cost of the system is reduced, and the configuration of the modular unit is facilitated; the direct current sides of the power units in the parallel group are independent of each other, so that the charging and discharging of the energy storage batteries can be controlled respectively, and the performance loss of the parallel use of a large number of batteries is reduced.
Example one
The embodiment of the invention provides a series-parallel hybrid multilevel converter with energy storage, wherein three phases of the multilevel converter adopt the same topological structure and are formed by modular power units which are firstly connected in parallel and then connected in series, as shown in figure 1. Taking the phase A as an example, m modular power units are connected in parallel to form a power unit group, namely modular power units A _ x _1, A _ x _2, a.. and A _ x _ m, wherein m (m is more than or equal to 2) modular power units are connected in parallel to form an x-level power unit group (x is more than or equal to 1 and less than or equal to n), and the 1 st-level parallel group and the 2 nd-level parallel group are connected in parallel; the n power unit groups are connected in series to form an A-phase electric loop, one end of the A-phase electric loop is connected with a power grid A, and the other end of the A-phase electric loop is used as a public end and connected with public ends of the B-phase and the C-phase. The composition of the B phase and the C phase is the same as that of the A phase.
The modular power unit is shown in fig. 2 and comprises an H-bridge converter, a filter reactor and an energy storage battery pack. The H-bridge converter adopts a two-level structure, the direct current side is directly connected with the energy storage battery pack, one end of the alternating current side is connected with the filter reactor L in series to form an output end-1, and the other end of the alternating current side is used as an output end-2. The ends-1 of the power units in the parallel group of the same level are connected together, and the ends-2 of the power units are connected together; the power units are cascaded, and the 2 ends of the upper-stage power unit are connected with the 1 ends of the lower-stage power unit.
At present, carrier phase shift PWM control is generally adopted in cascaded multilevel, and the control mode is described as follows: for n modular power units connected in series, the triangular carriers of the modular power units are sequentially shifted by a phase angle of 2 pi/n, and then the triangular carriers are compared with sinusoidal modulation waves to generate n groups of PWM control signals to respectively drive n basic power units. Due to the serial connection, the output voltages of the modular power units are superposed to obtain the PWM output voltage waveform of the multi-level converter.
The invention provides a dual phase-shifting PWM control method of a series-parallel hybrid multilevel converter with energy storage, which is suitable for series-parallel hybrid cascade multilevel power unit H-bridge control, and the core implementation mode is described as follows:
the m modularized power units are connected in parallel to the power unit group, the n power unit groups are connected in series to form a single-phase cascade topology, and phase shifting is performed on the triangular carriers in the series direction and the parallel direction simultaneously, namely the triangular carriers in the series direction are sequentially shifted by 2 pi/n phase angles, and the triangular carriers in the parallel direction are sequentially shifted by 2 pi/m phase angles, so that double phase shifting is formed. The triangular carrier wave is compared with the sine modulation wave to generate n multiplied by m groups of PWM control signals to respectively drive the H bridges of the n multiplied by m modular power units. The m power units are connected in parallel after passing through respective internal filter reactors to form the output voltage of the current stage, and the output voltages of all stages are superposed to obtain the output voltage waveform of the multi-level converter.
Taking the power unit of phase A in FIG. 1 as an example, the initial phase angle of the triangular carrier of unit A _1_1 is 0, the initial phase angle of the triangular carrier of unit A _3_2 is (3-1) × 2 π/n + (2-1) × 2 π/m, and the initial phase angle of the triangular carrier of unit A _ n _ m is (n-1) × 2 π/n + (m-1) × 2 π/m.
Taking the modulation of the H-bridge converter as an example, as shown in fig. 6, the PWM pulse generation of the H-bridge part in each power unit may adopt bipolar control, which is generated by comparing a pair of sinusoidal modulation waves with equal amplitude and opposite phase (with a 180 ° difference) with the above triangular carrier corresponding to the unit, and the positive sinusoidal modulation wave + Ur is compared with the triangular carrier Ut to generate the control signal of the left arm of the power unit, when + Ur > Ut, the control signal L1 of the upper switch tube of the left arm is at high level, otherwise, L1 is at low level, and the control signal of the lower switch tube is inverted by L1; and comparing the negative sine modulation wave-Ur with the carrier Ut to generate a control signal of a right bridge arm of the power unit, wherein when-Ur is larger than Ut, the control signal R1 of the switching tube on the right bridge arm is at a high level, otherwise, R1 is at a low level, and the control signal of the lower switching tube is obtained by inverting R1. And finally, the PWM control signal output by the power unit is shown as Uo.
For more concrete image of the embodiment, a multilevel inverter is formed by taking m =2 and n =3 as an example, as shown in fig. 3. As can be seen from the figure, the alternating current sides of the H bridges of the power units connected in parallel are connected in parallel through respective filter reactors, so that the problem of short circuit and overcurrent caused by direct parallel connection of the H bridges is avoided; the direct current sides of the parallel power units are mutually independent, and energy storage batteries can be managed respectively, so that the overall utilization rate of the batteries is improved; after the power grid is connected, the characteristic of a single converter is still embodied, and the problem of multi-machine parallel coordination control is solved.
Example two
In this embodiment, the series-parallel hybrid cascade mode is the same as that of the first embodiment, but the modular power unit has a different structure, as shown in fig. 4, and includes an H-bridge converter, a filter reactor, and an energy storage battery pack. The H-bridge converter adopts a three-level structure, the positive electrode and the negative electrode of the direct current side are directly connected with the positive electrode and the negative electrode of the energy storage battery pack respectively, one end of the alternating current side is connected with the filter reactor L in series to form an output end-1, and the other end of the alternating current side is used as an output end-2.
EXAMPLE III
In this embodiment, the series-parallel hybrid cascade mode is the same as that of the first embodiment, but the modular power unit has a different structure, as shown in fig. 5, and includes an H-bridge converter, a filter reactor, a DC/DC converter, and an energy storage battery pack. The H-bridge converter adopts a two-level structure, the direct current side is connected with the energy storage battery pack after being subjected to voltage reduction through the DC/DC converter, the H-bridge converter is suitable for the battery pack with a wider voltage range, one end of the alternating current side is connected with the filter reactor L in series to form an output end-1, and the other end of the alternating current side is used as an output end-2.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a take series-parallel connection of energy storage to mix many level converter which characterized in that: the three phases of the multilevel converter adopt the same topological structure, each phase of the topological structure mainly comprises a plurality of modular power units which are connected in parallel and then connected in series, wherein the plurality of power units are connected in parallel to form parallel groups, the plurality of parallel groups are sequentially connected in series to form a single-phase electric loop, one end of the single-phase electric loop is used as one of the three phases of the multilevel converter and is connected with the three phases corresponding to a power grid, and the other end of the single-phase electric loop is used as a public end and is connected with the public ends of the other two phases of the multilevel converter.
2. The series-parallel hybrid multilevel converter with energy storage of claim 1, wherein: the parallel group comprises at least two modular power units, and the number of the modular power units in the parallel group is determined by the actual capacity requirement of the multi-level converter.
3. The series-parallel hybrid multilevel converter with energy storage of claim 1, wherein: the plurality of parallel groups are sequentially connected in series to form a single-phase electric loop, and the series number is determined by the voltage grade applied by the multi-level converter.
4. The series-parallel hybrid multilevel converter with energy storage of claim 1, wherein: the modularized power unit comprises a converter, a filter reactor and an energy storage battery pack; the direct current side of the converter is connected with an energy storage battery pack; one end of the alternating current side of the converter is connected with a filter reactor in series to form an output end-1 which is used as one of three phases of the multilevel converter and is connected with three phases corresponding to a power grid, and the other end of the alternating current side of the converter is used as an output end-2 which is used as a public end and is connected with the public ends of the other two phases of the multilevel converter.
5. The series-parallel hybrid multilevel converter with energy storage of claim 4, wherein: the output ends-1 and 2 of the modular power units in the same-stage parallel group are connected with each other; the modular power units are connected in series, and the output end-2 of the previous stage is connected with the output end-1 of the next stage.
6. The series-parallel hybrid multilevel converter with energy storage of claim 4, wherein: the converter is an H-bridge converter, a half-bridge converter or a hybrid H-bridge half-bridge converter, and the H-bridge converter adopts a two-level H-bridge converter or a three-level H-bridge converter.
7. The series-parallel hybrid multilevel converter with energy storage of claim 4, wherein: and in the process of connecting the direct current side of the converter with the energy storage battery pack, the direct current side of the converter is directly connected with the energy storage battery pack or is connected with the energy storage battery pack through a DC/DC converter.
8. The series-parallel hybrid multilevel converter with energy storage of claim 4, wherein: the other end of the alternating current side of the converter is used as an output end-2 and comprises: the other end of the alternating current side of the converter is directly used as an output end-2 or used as an output end-2 after passing through a series filter reactor.
9. A dual phase-shifting PWM control method of a series-parallel hybrid multilevel converter with energy storage is applied to the series-parallel hybrid multilevel converter with energy storage of any one of claims 1 to 8, and is characterized in that: the three phases of the multilevel converter adopt the same topological structure, each phase of the topological structure mainly comprises a plurality of modular power units in a mixed mode of firstly connecting in parallel and then connecting in series, the phase of a triangular carrier wave is simultaneously shifted in the serial direction and the parallel direction, double phase shifting is realized, the triangular carrier wave is compared with a sine modulation wave to generate a plurality of PWM control signals, and the modular power units are respectively driven in a one-to-one correspondence mode.
10. The dual phase-shifting PWM control method for the energy-storing serial-parallel hybrid multilevel converter according to claim 9, wherein the angle of the phase-shifting of the triangular carrier in the serial direction and the parallel direction is: the m modularized power units are connected in parallel to the power unit groups, the n power unit groups are connected in series to form a single-phase cascade topology, the triangular wave is sequentially shifted by 2 pi/n phase angles in the serial direction and sequentially shifted by 2 pi/m phase angles in the parallel direction, and double phase shifting is formed.
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