CN110957912B - Distributed energy storage device based on controllable direct current bus - 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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac 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
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
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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
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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
- H02M7/53875—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 with analogue control of three-phase output
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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
- H02M7/539—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 with automatic control of output wave form or frequency
- H02M7/5395—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 with automatic control of output wave form or frequency by pulse-width modulation
Abstract
The invention discloses a distributed energy storage device based on a controllable direct current bus, which comprises a controllable direct current bus part and an inverter part, wherein the controllable direct current bus part comprises a chain circuit formed by a plurality of half-bridge circuits and a buck/boost bidirectional voltage regulating circuit, and the inverter part comprises a three-phase bridge converter. The chain circuit is subjected to carrier stacking modulation by a voltage ring added with a voltage equalization algorithm to obtain a switching signal, the buck/boost bidirectional voltage regulating circuit is subjected to PWM modulation by dividing a voltage sampling value by a voltage given value to obtain a switching signal, and the inverter circuit is subjected to PWM modulation by a vector control-based grid-connected algorithm to obtain a switching signal. The direct current bus structure combines the voltage reduction advantage of the chain circuit with the voltage boosting advantage of the buck/boost circuit, has the advantages of being simple in control method, stable in direct current bus voltage, capable of reducing energy storage cost and internal resistance loss, capable of balancing output of each energy storage unit, high in universality, easy to expand and the like, and is suitable for the special operation environment of low-voltage high-power distributed energy storage.
Description
Technical Field
The invention relates to a distributed energy storage device, in particular to a distributed energy storage device based on a controllable direct current bus, and belongs to the field of distributed energy storage application.
Background
With the development of ultra-high voltage power transmission and energy internet technologies, a large amount of regional incoming calls are supplied in real time and a new energy generator set is continuously put into operation, so that huge power requirements caused by high-speed economic development in coastal areas of eastern China are relieved, and the pressure of atmospheric environmental protection treatment is relieved. However, the transmission capacity of the extra-high voltage line is huge, and once abnormal fluctuation or an emergency occurs, local power shortage is caused, and even a large-scale system oscillation or disconnection is generated, so that serious economic loss and bad social influence are brought. On the other hand, new energy power Generation represented by wind energy and solar energy has natural volatility and intermittence, output power of the new energy power Generation has large uncertainty during grid-connected operation, frequency oscillation and deviation events are more frequent, high-frequency components of Area Control Error signals (ACE) of an interconnection system are increased, and requirements of AGC instructions issued by Automatic Generation Control (AGC) on response delay and climbing rate of a frequency modulation unit are more strict.
Energy storage devices, as a fast and controllable power source, play an important role in energy buffering in increasingly complex source-grid-load systems. Different from the traditional large-capacity and centralized energy storage power station, the distributed energy storage concept is gradually developed, the energy storage device is arranged in a transformer substation and other places, the required capacity of the energy storage device can be greatly reduced, the frequency modulation capacity of a traditional unit is improved, additional revenue is created, the equivalent rotation reserve capacity of a power grid can be improved, the capacity of the large power grid for receiving new energy power generation and power electronic loads is improved, and the strong and stable operation of the power grid is promoted. However, this is a low-voltage and high-current operation environment, which may cause problems such as large internal resistance loss, uneven charging and discharging output, and more difficult series voltage equalization. In addition, a balance control strategy, such as an SOC balance algorithm, an auxiliary voltage-sharing loop and the like, is added into the energy storage device, so that the partial modules can be prevented from being overcharged and overdischarged. The balance control strategy is complex in structure and easy to generate interactive influence with carrier phase shift modulation, the phase shift relation between output voltages of the sub-modules is changed, the inherent advantages of the carrier phase shift modulation are weakened, and grid-connected current THD is increased.
The converter based on the chain structure is used as a highly-modularized multi-port collection grid-connected converter, and provides a new solution for the problems. However, the current research work mainly focuses on improving the number of output levels of the converter, reducing the distortion degree of output waveforms, and paying less attention to the fields of auxiliary AGC frequency modulation and distributed energy storage. When the chain-type converter is applied to the design of the energy storage device, because the capacity of the single energy storage module is low, the number of the energy storage modules required by a high-power application occasion is large, namely the number of the cascade converters is large, the device has the capability of outputting a large number of levels, the requirements of further improving the number of the output levels and reducing the waveform THD are weak, and the number of switching devices and the circuit complexity can be greatly increased. How to apply the chain converter in the high-voltage high-power occasion to the low-voltage high-power occasion and combine with the super capacitor energy storage and AGC frequency modulation characteristics to form a key device in a novel distributed energy storage concept, still has more problems to be solved urgently.
Disclosure of Invention
The invention aims to solve the technical problems of overhigh internal resistance loss and difficult bidirectional voltage regulation of an energy storage device based on a chain converter under the distributed energy storage operating environment with low voltage and high power, and the problems of strong heat dissipation requirement, low device efficiency, higher total direct current voltage constraint, higher energy storage cost and the like caused by the problems.
The invention adopts the following technical scheme for solving the technical problems:
the invention provides a distributed energy storage device based on a controllable direct current bus, which comprises a plurality of energy storage modules, a plurality of half-bridge circuits, a buck/boost bidirectional voltage regulating circuit, a three-phase bridge converter and a filter inductor, wherein the energy storage modules are connected with the buck/boost bidirectional voltage regulating circuit; the energy storage module is in one-to-one correspondence with the half-bridge circuits, one energy storage module is connected to the input end of one half-bridge circuit, the output end of the controllable direct current bus is connected to the three-phase bridge converter, and the three-phase bridge converter is connected to an alternating current power grid through the filter inductor.
As a further technical scheme of the invention, the alternating current power grid is an alternating current power grid with a three-phase line voltage effective value of 380V.
As a further technical scheme of the invention, the buck/boost bidirectional voltage regulating circuit consists of a filter inductor, a first switch tube, a second switch tube and a filter capacitor, wherein an emitter of the first switch tube is electrically connected with a collector of the second switch tube, the filter inductor is electrically connected with the emitter of the first switch tube, the filter capacitor is electrically connected with the collector of the first switch tube and the emitter of the second switch tube, and an output voltage V of the buck/boost bidirectional voltage regulating circuit is sampleddAnd divided by the given value V of the DC bus voltagedcrefAnd obtaining trigger signals of the first and second switching tubes through PWM modulation, wherein the trigger signals of the first and second switching tubes are opposite.
As a further technical scheme of the invention, the kth half-bridge circuit is composed of two switching devices, and the output voltage V of the buck/boost bidirectional voltage regulating circuit is sampleddcUsing a given value V of DC bus voltagedcrefAnd VdcMaking difference, inputting the difference value into PI controller and adding amplitude limit, and adding V to the output resultdcrefAnd sending the carrier wave to be modulated in a laminated manner, and obtaining trigger signals of the two switches through a voltage equalization algorithm, wherein the trigger signals of the two switches are opposite.
As a further technical solution of the present invention, the voltage equalization algorithm specifically includes: sampling the voltage of each energy storage module in real time, dividing the voltage by the rated voltage of the corresponding energy storage module to obtain the voltage per unit value of each energy storage module, arranging the obtained voltage per unit values of each energy storage module in a descending order, and sequentially recording the number of a half-bridge circuit corresponding to the descending voltage per unit value to obtain a number sequence of the half-bridge circuit; when the energy storage device receives a discharge instruction, all trigger signals obtained by carrier lamination modulation are sequentially sent to all half-bridge circuits corresponding to the half-bridge circuit serial number sequence from the bottom layer to the top layer; when the energy storage device receives a charging instruction, all trigger signals obtained by carrier lamination modulation are sequentially sent into all half-bridge circuits corresponding to the half-bridge circuit number sequence from the top layer to the bottom layer.
As a further technical solution of the present invention, the control algorithm of the three-phase bridge converter adopts a vector conversion-based grid-connected algorithm, and a switching tube trigger signal is obtained through PWM modulation: sampling AC network voltage ugabcD-axis voltage V is calculated through phase-locked loop PLL and rotation conversiondQ-axis voltage VqAnd phase-locked angle thetain(ii) a Sampling AC network current igabcBy thetainD-axis current I calculated by rotation conversiondAnd q-axis current Iq(ii) a Will give the active power PgrefDivided by 1.5VdObtaining a given d-axis current I through amplitude limitingd *Subtract IdThe obtained difference is added with V after PI linkdSubtract IqωLgTo obtain d-axis output voltage, where ω and LgThe voltage angular velocity and the line inductance of the power grid are respectively; will give the active power QgrefDivided by-1.5VdObtaining a given q-axis current I through amplitude limitingq *Subtract IqThe obtained difference is added with V after PI linkdPlus IdωLgObtaining q-axis output voltage, and carrying out reverse rotation transformation on the d-axis output voltage and the q-axis output voltage to obtain a modulated wave umThe switch of the three-phase bridge circuit is obtained by PWM modulationA trigger signal.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
(1) the provided controllable direct current bus combines the voltage reduction advantage of the chain circuit with the voltage boosting advantage of the buck/boost circuit, so that the voltage of the direct current bus can be flexibly adjusted, the total direct current voltage constraint is reduced, the energy storage cost is reduced, the dynamic performance is good, and the voltage stability of the direct current bus can be maintained in real time;
(2) the provided direct current bus can effectively reduce the output current of the energy storage module, reduce the internal resistance loss and greatly improve the efficiency of the device;
(3) the control algorithm of the direct current bus is simple, and the practical debugging is convenient. In addition, the voltage-sharing algorithm based on carrier stack modulation only changes the serial number of the output channel of the internal trigger pulse of the chain structure, does not influence the electrical relationship at the output port of the chain structure, and does not generate additional negative influence;
(4) compared with the traditional energy storage device based on the chain-link converter, the direct current side of the device has no power fluctuation, so that the effect of the voltage-sharing algorithm is better.
Drawings
FIG. 1 is a block diagram of the main circuit structure of the present invention;
FIG. 2 is a DC bus control block diagram of the present invention;
FIG. 3 is a voltage sharing algorithm control block diagram of the present invention;
fig. 4 is a control block diagram of a three-phase bridge converter of the present invention.
Detailed Description
The technical scheme of the invention is further explained in detail by combining the attached drawings:
example 1
A topology structure of a distributed energy storage device based on a controllable direct current bus is provided. The system provided in the present embodiment will be described in detail with reference to fig. 1.
Referring to fig. 1, a topology of a distributed energy storage device based on a controllable dc bus, the topology comprising: the power supply comprises a plurality of energy storage modules, a plurality of half-bridge circuits, a buck/boost bidirectional voltage regulating circuit, a three-phase bridge converter and a power grid side filter inductor.
The energy storage module with the half-bridge module one-to-one electricity is connected, the half-bridge module cascades in proper order and constitutes chain circuit, and chain circuit is connected with buck/boost two-way voltage regulation circuit electricity, buck/boost two-way voltage regulation circuit is connected with three-phase bridge converter, electric wire netting side filter inductance, alternating current electric network electricity in proper order.
The half-bridge module is composed of a switching device S1kAnd a switching device S2kComposition S1kEmitter and S2kWherein k is the submodule number.
The half-bridge modules are sequentially cascaded, namely S of the kth half-bridge circuit2kAnd S of the (k + 1) th half-bridge circuit1(k+1)Is electrically connected.
The buck/boost bidirectional voltage regulating circuit consists of a filter inductor LfSwitch tube T1And T2Filter capacitor CfComposition, switch tube T1Emitter and T2Is electrically connected with the collector, a filter inductor LfAnd a switching tube T1Is electrically connected with the emitter, and a filter capacitor CfAnd a switching tube T1Collector electrode and T2Is electrically connected.
Example 2
And a control algorithm of the distributed energy storage device based on the controllable direct current bus. The system provided in the present embodiment will be described in detail with reference to fig. 2 to 4.
Referring to fig. 2 to 4, a control algorithm of a distributed energy storage device based on a controllable dc bus, the algorithm includes: a chain structure control algorithm, a buck/boost bidirectional voltage regulating circuit control algorithm and a three-phase bridge converter control algorithm.
The chain structure control algorithm adopts a voltage ring, and a switching tube trigger signal is obtained through a PI controller, carrier wave laminated modulation and a voltage equalization algorithm: sampling buck/boost bidirectional voltage regulating circuit output voltage VdcSetting V by DC bus voltagedcrefMaking difference with sampling value, inputting the difference value into PI controller and adding amplitude limit, adding DC bus voltage and output result, and sending into carrier laminated modulationAnd then obtaining S through a voltage equalization algorithm1kTrigger signal, will S1kObtaining S after negation of the trigger signal2kA trigger signal.
The voltage equalization algorithm is composed of a duty ratio recording module, a voltage per unit value sequencing module and a duty ratio exchange module. As described in detail below with reference to fig. 3. The method comprises the steps of sampling the voltage at the end of each energy storage module in real time, obtaining the voltage per unit value at the end of each energy storage module according to the rated voltage of the corresponding energy storage module, arranging the voltage per unit values at the end of each energy storage module in a descending order, sequentially recording the number of a half-bridge circuit corresponding to the voltage per unit value in the descending order to obtain a sequence of the number of the half-bridge circuit, when the energy storage device receives a discharge instruction, sequentially sending each trigger signal obtained by carrier stacking modulation into each half-bridge circuit corresponding to the sequence of the number of the half-bridge circuit from the bottom layer to the top layer, and when the energy storage device receives a charge instruction, sequentially sending each trigger signal obtained by carrier stacking modulation into each half-bridge circuit corresponding to the sequence of the number of the half-bridge circuit from the top layer to the bottom layer.
After the voltage equalization algorithm is added, if the voltage per unit value of the kth energy storage module is smaller than that of the (k + 1) th energy storage module, the priority level of the voltage per unit value sequence (descending sequence) of the kth energy storage module is reduced, the number of correspondingly used carrier layers (ascending sequence) is increased, namely the duty ratio of the kth half-bridge module is reduced, the discharge depth of the energy storage module of the sub-module is reduced, and the voltage recovery is promoted. Similarly, when the energy storage modules are charged, if the voltage per unit value of the kth energy storage module is smaller than the voltage per unit value of the (k + 1) th energy storage module, the priority in the voltage per unit value sequencing of the kth energy storage module is reduced, the number of correspondingly used carrier layers is reduced, namely the duty ratio of the kth half-bridge module is increased, the charging depth of the energy storage modules of the sub-module is increased, and the voltage recovery is promoted.
Defining switch tube T in buck/boost bidirectional voltage regulating circuit1Duty ratio of dv. Because of L in each switching periodfIs 0, the equation can be set forth
Vd＝dvVdc (1)
Wherein, VdFor buck/boost bi-directional modulationThe input voltage of the circuit is pressed.
To ensure that the control algorithm is effective in dividing VdcIs stabilized at VdcrefModify equation (1) to
Equation (2) is the duty cycle generation method of the buck/boost bi-directional voltage regulator circuit of fig. 2.
This is explained in detail with reference to fig. 2. Sampling buck/boost bidirectional voltage regulating circuit input voltage VdAnd divided by the given value V of the DC bus voltagedcrefThe switching tube T is obtained through PWM modulation1Trigger signal of, T1Is negated to obtain T2The trigger signal of (1).
The three-phase bridge converter control algorithm adopts a vector conversion-based grid-connected algorithm, and a switching tube trigger signal is obtained through PWM modulation. This is explained in detail in conjunction with fig. 4. Sampling grid voltage ugabcD-axis voltage V is calculated through phase-locked loop PLL and rotation conversiondQ-axis voltage VqAnd phase-locked angle thetain. Sampling grid current igabcBy thetainD-axis current I calculated by rotation conversiondAnd q-axis current Iq. Will give the active power PgrefDivided by 1.5VdObtaining a given d-axis current I through amplitude limitingd *Subtract IdThe obtained difference is added with V after PI linkdSubtract IqωLgObtaining d-axis output voltage and giving active power QgrefDivided by-1.5VdObtaining a given q-axis current I through amplitude limitingq *Subtract IqThe obtained difference is added with V after PI linkdPlus IdωLgObtaining q-axis output voltage, and carrying out reverse rotation transformation on the d-axis output voltage and the q-axis output voltage to obtain a modulated wave umAnd obtaining a switch trigger signal of the three-phase bridge circuit through PWM modulation. Wherein, ω and LgRespectively, grid voltage angular velocity and line inductance.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (3)
1. A distributed energy storage device based on a controllable direct current bus is characterized by comprisingnAn energy storage module,nThe bridge-type inverter comprises half-bridge circuits, buck/boost bidirectional voltage regulating circuits, a three-phase bridge converter and a first filter inductor; each half-bridge circuit consists of an upper switching tube and a lower switching tube, wherein an emitting electrode of the upper switching tube is connected with a collector electrode of the lower switching tube; the energy storage modules correspond to the half-bridge circuits one by one, and each energy storage module is connected with the corresponding half-bridge circuit through a collector of an upper switch tube and an emitter of a lower switch tube in the corresponding half-bridge circuit; first, thekEmitter and second emitter of switch tube under half-bridge circuitk+The emitting electrodes of the switching tubes on 1 half-bridge circuit are connected to form a chain circuit, the chain circuit is connected in series with the buck/boost bidirectional voltage regulating circuit through the emitting electrode of the switching tube on the first half-bridge circuit and the emitting electrode of the switching tube on the last half-bridge circuit on the chain circuit to form a controllable direct current bus, the output end of the controllable direct current bus is connected to a three-phase bridge converter, the three-phase bridge converter is connected to an alternating current power grid through a first filter inductor,k=1,2,…, n-1，nis a positive integer greater than 2;
the buck/boost bidirectional voltage regulating circuit comprises a second filter inductor, a first switch tube, a second switch tube and a filter capacitor, wherein an emitting electrode of the first switch tube is electrically connected with a collecting electrode of the second switch tube, one end of the second filter inductor is electrically connected with the emitting electrode of the first switch tube, the other end of the second filter inductor is connected with an emitting electrode of a switch tube on a first half-bridge circuit on the chain circuit, one end of the filter capacitor is connected with the collecting electrode of the first switch tube, the other end of the filter capacitor is connected with the emitting electrode of the second switch tube, the emitting electrode of the second switch tube is connected with an emitting electrode of a switch tube under the last half-bridge circuit on the chain circuit, and two ends of the filter capacitor are output ends of the controllable direct current bus; sampling buck/boost bidirectional voltage regulating circuit input voltageV dAnd divided by the given value of the DC bus voltageV dcrefObtaining trigger signals of a first switching tube and a second switching tube through PWM modulation, wherein the trigger signals of the first switching tube and the second switching tube are opposite;
sampling buck/boost bidirectional voltage regulating circuit output voltageV dcUsing DC bus voltage set valueV dcrefAndV dcmaking difference, inputting the difference value into PI controller, adding amplitude limit to the output of PI controller and addingV dcrefAnd sending the signals to a carrier laminated modulation module, and obtaining trigger signals of each switching tube in each half-bridge circuit by the output of the carrier laminated modulation module through a voltage equalization algorithm.
2. The distributed energy storage device based on the controllable direct current bus of claim 1, wherein an effective value of a three-phase line voltage of the alternating current power grid is 380V.
3. The distributed energy storage device based on the controllable direct-current bus according to claim 1, wherein the voltage equalization algorithm is specifically: sampling the voltage of each energy storage module in real time, dividing the voltage by the rated voltage of the corresponding energy storage module to obtain the voltage per unit value of each energy storage module, arranging the obtained voltage per unit values of each energy storage module in a descending order, and sequentially recording the number of a half-bridge circuit corresponding to the descending voltage per unit value to obtain a number sequence of the half-bridge circuit; a plurality of carriers are sequentially stacked from bottom to top, wherein the lowest layer is a bottom layer, and the uppermost layer is a top layer; when the energy storage device receives a discharge instruction, all trigger signals obtained by carrier lamination modulation are sequentially sent to all half-bridge circuits corresponding to the half-bridge circuit serial number sequence from the bottom layer to the top layer; when the energy storage device receives a charging instruction, all trigger signals obtained by carrier lamination modulation are sequentially sent into all half-bridge circuits corresponding to the half-bridge circuit number sequence from the top layer to the bottom layer.
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