CN111865120B - Energy router alternating current side modulation method based on serial digital voltage stabilizer - Google Patents
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
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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
-
- 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
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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
- H02M7/501—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 sinusoidal output voltages being obtained by the combination of several pulse-voltages having different amplitude and width
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0012—Control circuits using digital or numerical techniques
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses an alternating current side modulation method of an energy router based on a serial digital voltage stabilizer. The invention is based on the energy router topology of the serial digital voltage stabilizer, and forms the ordered matching of the high-voltage module unit and the comprehensive output voltage of the serial digital voltage stabilizer by designing the modulation strategy scheme of the high-voltage module unit of the high-voltage alternating-current side cascade H-bridge structure and the auxiliary module in the serial digital voltage stabilizer, ensures that the energy absorption or release directions of all the units are the same, eliminates the power circulation problem between the high-voltage module unit and the auxiliary module of the serial digital voltage stabilizer, improves the system efficiency, simultaneously realizes that the alternating-current modulation voltage with multi-level quantity can still be output when the number of the high-voltage module unit and the switching frequency are reduced, and effectively reduces the filter inductance volume and the inductance loss of the network side.
Description
Technical Field
The invention relates to the field of energy routers, in particular to an alternating current side modulation method of an energy router based on a serial digital voltage stabilizer.
Background
With the continuous increase of global power demand and the rapid development of new energy technologies, large-area and high-permeability application becomes a trend, and energy fluctuation can be introduced by the mutually independent energy sources incorporated into a power grid, so that the stability and safety of the power grid can be influenced. How to realize the real-time balance of energy and the real-time control of energy in the power network becomes a key problem, the traditional power system and the power equipment cannot meet the requirements of power supply situation diversification and multi-directional energy flow, and the energy router serving as one of core equipment can well solve the problems, so that the energy router becomes a popular direction of current industry research. At present, the topology commonly used in the research of high-voltage alternating current side AC/DC conversion of an energy router mainly comprises an MMC type and a CHB type, most of modulation modes are based on a traditional carrier phase shift modulation method, and a plurality of high-voltage module units and a large network side filter inductance are often needed to meet high-voltage connection requirements and electric energy quality requirements, so that adverse effects are brought to system cost, volume and efficiency.
Disclosure of Invention
In order to solve the problems, the invention provides an energy router alternating current side modulation method based on a serial digital voltage stabilizer, which comprises the following steps:
the energy router alternating current side modulation method based on the serial digital voltage stabilizer comprises the following steps:
step 1: the high-voltage side AC/DC stage performs high-voltage side grid-connected current control and low-voltage direct current bus voltage control and generates three-phase modulation voltage V n (n=a, b, c), each phase high voltage module unit dc bus voltage U dc_m Auxiliary module DC bus voltage U n Initialized modulation voltage intermediate variable V res ＝|V n |，
Step 2: after being input into the modulation control module, the high voltage module units of each phase are sequenced periodically, the boundary conditions of the synthesis level of the high voltage module units are calculated by utilizing the DC bus voltages of the high voltage module units and the auxiliary module, the number of the high voltage module units and the corresponding units which participate in the voltage synthesis are selected by combining and sequencing results through judgment logic,
step 3: selecting an auxiliary module participating in voltage synthesis according to boundary conditions of the voltage calculation synthesis level of the DC bus of the auxiliary module and judgment logic,
step 4: and forming driving signals of each H-bridge power device according to the modulating voltage, and jointly synthesizing a multi-level alternating current modulating voltage by the high-voltage cascade module and the serial digital voltage stabilizer to realize active and reactive component control of grid-connected current at the alternating current side so as to realize the stability of a low-voltage direct current bus.
Wherein: each phase of the high-voltage alternating-current side of the energy router is formed by connecting N high-voltage module units of a cascade H-bridge structure with a serial digital voltage stabilizer consisting of auxiliary modules of M H-bridge structures in series, and three phases are connected into a star-shaped structure to realize AC/DC conversion;
the voltage of the direct current bus of the high-voltage module unit is U dc_m (m=1, 2,3 … N), auxiliary module dc bus voltage U n ＝U dc /2 n (n=1, 2,3 … M), each H bridge structure is connected with a series resonance type double-active H bridge isolation converter to realize DC/DC conversion and isolation, and 3N+3M DC/DC converter outputs are connected in parallel to form a low-voltage direct current port, and the low-voltage direct current port is connected with a DC/AC device for inversion to form a low-voltage alternating current port.
Preferably, the periodic ordering method of the high voltage module units of each phase is that each phase defines an array P [ N ] with a length of N, the sequence of the high voltage module unit numbers 1,2,3 … N is sequentially stored in the arrays P [0], P [1], P [2] … P [ N-1] for initialization, and the module numbers in the arrays are rotated every period T, namely, P [0] =p [ N-1], P [1] =p [0], P [2] =p [1] … P [ N-1] =p [ N-2].
Preferably, the boundary conditions of the high voltage module unit synthesis level are:
the boundary conditions of the auxiliary module synthesis level are as follows:
wherein n=1, 2,3 … M, k H Boundary conditions for judging whether high voltage module unit input is needed; k (k) n And k' n To determine whether the nth auxiliary module is to be put into boundary conditions, V res To modulate voltage V n And the difference between the combined voltages of the high voltage module unit and the auxiliary module for determining the state.
Preferably, the boundary condition judgment of the high voltage module unit inputLogic is if k H > 0, then according to array P [ N ]]In selecting the front-most array variable P [ i ] that has not been selected]The corresponding high-voltage module unit input and output is selected according to the medium unit number; the boundary condition judgment logic of the auxiliary module input is that if k' n Not less than 1 or
And the nth auxiliary module is put into operation, otherwise, the nth auxiliary module is not put into operation.
Preferably, the high voltage module unit and the serial digital voltage stabilizer jointly synthesize the maximum level quantity of the multi-level alternating current modulation voltage as follows: b= [ (n+1) ×2 M -1]×2+1。
Compared with the prior art, the invention has the beneficial effects that: the power circulation problem between the high-voltage module unit and the auxiliary module is eliminated, and the system efficiency is improved; and the voltage output of the high-voltage module unit and the auxiliary module is effectively cooperated to output more levels, the requirement on the filtering inductance of the network side is reduced, the cost and the loss are reduced, the switching frequency of the high-voltage module unit is reduced, and meanwhile, the synthesis quality of the modulation voltage is ensured.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute an undue limitation to the application.
FIG. 1 is a topology of an energy router based on a series digital voltage regulator;
FIG. 2 is a topology of a series digital voltage regulator;
FIG. 3 is a logic flow diagram of one phase modulation method;
FIG. 4 is a waveform of a single-phase modulation voltage according to the modulation method of the present invention;
FIG. 5 is a waveform of a conventional carrier phase-shifting cascaded H-bridge modulation voltage;
FIG. 6 is a high frequency spectral analysis of a single phase grid-tie current waveform of the modulation method of the present invention;
FIG. 7 is a high-frequency spectrum analysis of a conventional carrier phase shifting cascaded H-bridge single-phase grid-connected current waveform;
FIG. 8 is a waveform of the voltage at the ports of the high voltage module unit according to the modulation method of the present invention;
fig. 9 is a waveform of the port voltage of a conventional carrier phase-shifting cascaded H-bridge high-voltage module cell.
Detailed Description
Hereinafter, embodiments of the present invention will be further described with reference to the accompanying drawings.
The topology diagram of the energy router based on the serial digital voltage stabilizer applied by the invention is shown in figure 1, and the system AC side adopts N DC bus voltages as U dc The H bridge high voltage module unit cascade structure is directly connected with a series digital voltage stabilizer in series and then directly merged into a medium and high voltage alternating current power grid to realize AC/DC conversion, the topology of the series digital voltage stabilizer is shown as figure 2, the series digital voltage stabilizer is formed by connecting M H bridges in series, and the DC bus voltage U of the H bridges n ＝U dc /2 n Wherein n=1, 2,3 … M;
each H bridge structure is connected with a series resonance type double-active H bridge isolation converter to realize DC/DC conversion and isolation, and 3N+3M DC/DC converters are output in parallel to form a low-voltage direct-current bus, and the low-voltage direct-current bus passes through a DC/AC converter to generate a low-voltage alternating-current bus port;
the high-voltage alternating-current side modulation method provided by the invention is shown in fig. 3:
step one, high-voltage side AC/DC stage performs high-voltage side grid-connected current control and low-voltage DC bus voltage control and produces three-phase modulation voltage V n (n=a, b, c), each phase high voltage module unit dc bus voltage U dc_m DC bus voltage U of auxiliary module n And an initialized modulation voltage intermediate variable V res ＝|V n After I is input into the modulation control module, the serial numbers of the high-voltage modules are sequentially assigned to the sequencing array P [ N ] according to the sequence from small to large]Finishing the initialization of the ordered array, and using T to time, if t=T, the number of the modular unit in the array is rotated, namely P [ i-1 ]]＝P[i-2](i＝1,2,3...N-1)；
Step two, calculating boundary condition k of high-voltage module unit synthesis level H ：
Calculating boundary condition k of auxiliary module synthesis level n And k' n ，
Wherein n=1, 2,3 … M, k H Boundary conditions for judging whether high voltage module unit input is needed; k (k) n And k' n To determine whether the nth auxiliary module is to be put into boundary conditions, V res To modulate voltage V n And determining the difference between the combined voltages of the high-voltage module unit and the auxiliary module;
step three, if k H > 0, slave array P [ N ]]Selecting the front-end array variable pi not selected]The medium-high voltage unit number k is set to be in the input state corresponding to the high voltage module, and the modulation voltage intermediate variable V is updated res ＝V res -U dc_m Then go to step four; if k is H If not more than 0, judging whether k' n Not less than 1 or
If the condition is satisfied, setting the nth auxiliary module to be in an on state, and updating the modulation voltage intermediate variable V res ＝V res -U n Wherein n=1, 2,3 … M, if the condition is not satisfied, proceeding to step four;
step four, if V res If not less than 0, returning to the second step, if V res < 0 and enter step five, a step of performing a step of;
step five, if V n Setting the module output voltage in the put-in state to positive bus voltage and the module output voltage in the non-put-in state to 0, otherwise setting the module output voltage in the put-in state to negative bus voltage and the module output voltage in the non-put-in state to 0.
FIG. 4 is a waveform of a single-phase modulation voltage according to the modulation method of the present invention; FIG. 5 is a waveform of a conventional carrier phase-shifting cascaded H-bridge modulation voltage; fig. 4 shows a serial digital voltage stabilizer-based energy router topology, wherein the modulation voltage waveform of one phase of high-voltage ac port is compared with the modulation voltage waveform of a cascade H-bridge topology structure under the traditional carrier phase shifting method, the number of high-voltage units n=9 in fig. 4, the number of auxiliary modules m=4, the number of cascade H-bridge high-voltage unit modules n=12 in fig. 5, and compared with the prior art, the number of high-voltage module units in the scheme is less, the sine degree of the modulation voltage waveform is better, and the maximum level number which can be generated on the ac side in the scheme is as follows:
B＝[(N+1)×2 M -1]×2+1
the maximum number of levels that can be generated by a traditional carrier phase-shifting cascade H-bridge topology is:
B＝2N+1
FIG. 6 is a high frequency spectral analysis of a single phase grid-tie current waveform of the modulation method of the present invention; FIG. 7 is a high-frequency spectrum analysis of a conventional carrier phase shifting cascaded H-bridge single-phase grid-connected current waveform; FIG. 6 shows the grid-connected current spectrum analysis of one phase of high-voltage alternating current port under the modulation method provided by the invention and the grid-connected current spectrum analysis of the alternating current port of the cascade H-bridge topological structure under the traditional carrier phase shifting method based on the energy router topology of the serial digital voltage stabilizer, wherein the frequency range is 5kHz to 15kHz, and compared with the known scheme, the high-frequency current harmonic component is lower, and the size requirement on the filter inductance at the network side is smaller;
FIG. 8 is a waveform of the voltage at the ports of the high voltage module unit according to the modulation method of the present invention; fig. 9 is a waveform of a port voltage of a conventional carrier phase-shifting cascaded H-bridge high-voltage module unit, fig. 8 shows that a port modulation voltage of one of the high-voltage module units based on an energy router topology of a serial digital voltage stabilizer in the modulation method according to the present invention is compared with a port modulation voltage of a cascaded H-bridge topology structure in the conventional carrier phase-shifting method, fig. 8 takes 100ms for an array rotation period T, fig. 9 has a carrier frequency of 500Hz, and compared with the high-voltage module unit with the known scheme, the port voltage variation frequency is lower, namely the switching frequency is lower;
in summary, according to the energy router ac side modulation method based on the serial digital voltage stabilizer, based on the energy router topology of the serial digital voltage stabilizer, by designing the modulation method scheme of the high voltage module unit of the high voltage ac side cascade H-bridge structure and the auxiliary module in the serial digital voltage stabilizer, the ordered coordination of the comprehensive output voltage of the high voltage module unit and the serial digital voltage stabilizer is formed, the energy absorption or release direction of each unit is ensured to be the same, the power circulation problem between the high voltage module and the auxiliary module of the serial digital voltage stabilizer is eliminated, the system efficiency is improved, meanwhile, the ac modulation voltage with multiple levels can still be output when the number of the high voltage module unit and the switching frequency are reduced, and the filter inductance volume and the inductance loss of the network side are effectively reduced.
The foregoing detailed description has set forth the objects, aspects and advantages of the invention in further detail, it should be understood that the foregoing description is only illustrative of the invention and is not intended to limit the scope of the invention, but is to be accorded the full scope of the invention as defined by the appended claims.
Claims (5)
1. An energy router alternating current side modulation method based on a serial digital voltage stabilizer is characterized by comprising the following steps:
step 1: the high-voltage side AC/DC stage performs high-voltage side grid-connected current control and low-voltage direct current bus voltage control and generates three-phase modulation voltage V n (n=a, b, c), each phase high voltage module unit dc bus voltage U dc_m Auxiliary module DC bus voltage U n Initialized modulation voltage intermediate variable V res ＝|V n |；
Step 2: after the high-voltage module unit is input into the modulation control module, the high-voltage module units of each phase are periodically sequenced, the boundary conditions of the synthesis level of the high-voltage module units are calculated by utilizing the direct-current bus voltages of the high-voltage module units and the auxiliary module, and the number of the high-voltage module units and the corresponding units which participate in the voltage synthesis are selected through a first judgment logic according to the combination and sequencing result;
step 3: selecting an auxiliary module participating in voltage synthesis according to boundary conditions of the voltage calculation synthesis level of the direct current bus of the auxiliary module and a second judgment logic;
step 4: forming driving signals of each H-bridge power device according to the modulating voltage, and jointly synthesizing a multi-level alternating current modulating voltage by a high-voltage cascading module and a serial digital voltage stabilizer, wherein the multi-level alternating current modulating voltage is used for realizing active and reactive component control of grid-connected current at an alternating current side, so that the stability of a low-voltage direct current bus is realized;
wherein: each phase of the high-voltage alternating-current side of the energy router is formed by connecting N high-voltage module units of a cascade H-bridge structure with a serial digital voltage stabilizer consisting of auxiliary modules of M H-bridge structures in series, and three phases are connected into a star-shaped structure to realize AC/DC conversion;
the voltage of the direct current bus of the high-voltage module unit is U dc_m (m=1, 2,3 … N), auxiliary module dc bus voltage U n ＝U dc /2 n (n=1, 2,3 … M), each H bridge structure is connected with a series resonance type double-active H bridge isolation converter to realize DC/DC conversion and isolation, and 3N+3M DC/DC converter outputs are connected in parallel to form a low-voltage direct current port, and the low-voltage direct current port is connected with a DC/AC device for inversion to form a low-voltage alternating current port.
2. The ac side modulation method of energy router based on serial digital voltage stabilizer according to claim 1, wherein each phase of the periodic ordering method of high voltage module units defines an array P [ N ] with length of N, sequentially stores the sequences of high voltage module unit numbers 1,2,3 … N into the array P [0], P [1], P [2] … P [ N-1] to initialize, and rotates the module numbers in the array every period T, i.e., P [0] =p [ N-1], P [1] =p [0], P [2] =p [1] … P [ N-1] =p [ N-2].
3. The energy router ac side modulation method based on series digital voltage stabilizer according to claim 1, wherein the boundary conditions of the high voltage module unit synthesis level are:
the boundary conditions of the auxiliary module synthesis level are as follows:
wherein n=1, 2,3 … M, k H Boundary conditions for judging whether high voltage module unit input is needed; k (k) n And k' n To determine whether the nth auxiliary module is to be put into boundary conditions, V res To modulate voltage V n And the difference between the combined voltages of the high voltage module unit and the auxiliary module for determining the state.
4. The method of claim 3, wherein the boundary condition first decision logic of the high voltage module unit input is if k H > 0, then according to array P [ N ]]In selecting the front-most array variable P [ i ] that has not been selected]The corresponding high-voltage module unit input and output is selected according to the medium unit number; the second judgment logic of the boundary condition input by the auxiliary module is that if k' n Not less than 1 or
And the nth auxiliary module is put into operation, otherwise, the nth auxiliary module is not put into operation.
5. The energy router alternating current side modulation method based on the series digital voltage stabilizer according to claim 1, wherein the maximum level number of the multi-level alternating current modulation voltage synthesized by the high voltage module unit and the series digital voltage stabilizer is as follows:
B＝[(N+1)×2 M -1]×2+1。
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