CN208638266U - A kind of power assembly system based on modular multi-level converter - Google Patents

A kind of power assembly system based on modular multi-level converter Download PDF

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Publication number
CN208638266U
CN208638266U CN201821624240.9U CN201821624240U CN208638266U CN 208638266 U CN208638266 U CN 208638266U CN 201821624240 U CN201821624240 U CN 201821624240U CN 208638266 U CN208638266 U CN 208638266U
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bridge arm
power
port
circuit
switch
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唐瑭
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唐瑭
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Abstract

This application provides a kind of power assembly systems based on modular multi-level converter, it include: exchange first port, exchange second port, the circuitry phase of multiple parallel connections, direct current first port, direct current second port, pilot controller and master controller, wherein, every circuitry phase includes: upper bridge arm circuit and lower bridge arm circuit, wherein, the second end of upper bridge arm circuit and the first end of lower bridge arm circuit cascade;Upper bridge arm circuit and lower bridge arm circuit include multiple cascade bridge arm submodules and bridge arm inductance, and each bridge arm submodule includes: capacitor, battery pack and multiple switch pipe, and at full-bridge circuit, capacitor is in parallel with battery pack for multiple switch pipe and capacitance group;Pilot controller detects the status information of each battery in battery pack, and the status information of each battery according to detection realizes the remaining capacity Balance route of each battery in the battery pack by way of bypass resistance.The power equalization between bridge arm submodule can effectively be promoted.

Description

A kind of power assembly system based on modular multi-level converter
Technical field
Whether this application involves field of new energy technologies (needing to refer to New-energy electric vehicle), specifically, relating to And a kind of power assembly system for being based on modular multi-level converter (MMC, Modular Multilevel Converter).
Background technique
The existing power assembly system based on modular multi-level converter, using the three of multiple submodule cascade (series connection) Six bridge arm structure of phase, the upper and lower bridge arm circuit that every phase includes are made of multiple bridge arm sub-module cascades.In this way, power can be ensured Assembly system exports the waveform of better quality, meanwhile, modular structure is also relatively simple, manufactures and easy to assembly.
Currently, for the power assembly system based on modular multi-level converter, the output of power assembly system Power is the superposition of the output power of each bridge arm submodule.But since each bridge arm submodule is in power output, output voltage with And output electric current can have different difference, cause the dump power of each bridge arm submodule that may not match that, so that each bridge arm Power equalization between submodule is poor, and the lower bridge arm submodule of dump power will directly drag down every phase level unsteady flow The overall performance of device reduces the service life of battery in bridge arm submodule to form " short -board effect ".
Utility model content
In view of this, the application's is designed to provide a kind of power assembly system based on modular multi-level converter System is poor flat with battery in traditional power assembly system for solving the power equalization between prior art bridge arm submodule The poor problem of weighing apparatus ability.
In a first aspect, the embodiment of the present application provides a kind of power assembly system based on modular multi-level converter, The power assembly system includes:
Exchange first port, exchange second port, the circuitry phase of multiple parallel connections, direct current first port, direct current second port, Pilot controller and master controller, wherein every circuitry phase includes: upper bridge arm circuit and lower bridge arm circuit, wherein upper bridge arm The second end of circuit and the first end of lower bridge arm circuit cascade;
Exchange first port by first switch connect second end in upper bridge arm circuit and lower bridge arm circuit first end it Between, for external first alternating current equipment output power or from the first alternating current equipment input power;
Exchange second port connects second end and the lower bridge arm electricity in upper bridge arm circuit by inversion inductor and second switch Between the first end on road, for external second alternating current equipment output power or from the second alternating current equipment input power;
Direct current first port is switched by third and two-way DC/DC circuit connects first end and lower bridge in upper bridge arm circuit Between the second end of arm circuit, for external first DC equipment output power or from the first DC equipment input power;
Direct current second port by the 4th switch connect upper bridge arm circuit first end and lower bridge arm circuit second end it Between, for external second DC equipment output power or from the second DC equipment input power;
Upper bridge arm circuit and lower bridge arm circuit include multiple cascade bridge arm submodules and bridge arm inductance, Mei Yiqiao Arm submodule includes: capacitor, battery pack and multiple switch pipe, and multiple switch pipe and capacitance group are at full-bridge circuit, capacitor and electricity Pond Bao Binglian;
Pilot controller is connected with bridge arm submodule;
Master controller, respectively with exchange first port, exchange second port, direct current first port, direct current second port with And pilot controller is connected.
Optionally, the upper bridge arm circuit includes the multiple upper bridge arm submodules and upper bridge arm inductance being sequentially connected in series;Lower bridge Arm circuit includes the multiple lower bridge arm submodules and lower bridge arm inductance being sequentially connected in series;
Exchange first port is connect between upper bridge arm inductance and lower bridge arm inductance by first switch;
The first end of exchange second port is connected with inversion inductor, second end connect by second switch in upper bridge arm inductance and Between lower bridge arm inductance.
Optionally, the bridge arm submodule includes: first switch tube, second switch, third switching tube, the 4th switch Pipe, first capacitor, first diode, the second diode, third diode, the 4th diode and battery pack, wherein
The collector of first switch tube respectively with the collector of second switch, the cathode of first diode, first capacitor One end and battery pack anode be connected;
The emitter of first switch tube is connected with the anode of the collector of third switching tube and first diode respectively;
The emitter of third switching tube respectively with the emitter of the 4th switching tube, the anode of third diode, first capacitor The other end and battery pack cathode be connected;
The cathode of third diode is connected with the collector of third switching tube;
The emitter of second switch is connected with the anode of the collector of the 4th switching tube and the second diode respectively;
The cathode of second diode is connected with the collector of second switch;
The cathode of 4th diode is connected with the collector of the 4th switching tube, the emitter phase of anode and the 4th switching tube Even;
First switch tube, second switch, third switching tube, the 4th switching tube base stage incoming control signal;
First end of the emitter of first switch tube as cascade bridge arm submodule, the emitter conduct of second switch The second end of cascade bridge arm submodule, and be connected with the first end of next cascade bridge arm submodule.
Optionally, when the tie point of the first switch tube and third switching tube is directed toward in bridge arm current direction, described first Switching tube and the conducting of the 4th switching tube, charge to battery pack, the second switch and the conducting of third switching tube, to battery Packet discharge, first switch tube and second switch conducting or, third switching tube and the 4th switching tube conducting, be isolated bridge Arm submodule.
Optionally, the bridge arm submodule further include:
Bipolar diode, including the 5th diode and the 6th diode, the 5th diode and the 6th diode are reversed Series connection, wherein the anode of the 5th diode is connected with the first end of bridge arm submodule, the cathode of the 5th diode and the six or two pole The cathode of pipe is connected, and the anode of the 6th diode is connected with the second end of bridge arm submodule.
Optionally, the battery pack includes multiple cascade battery modules, and each battery module includes the electricity of multiple parallel connections Pond.
Optionally, further includes: the second capacitor and third capacitor, wherein
Second capacitor is connected with third capacitor, and one end of the second capacitor is connected with the first end of upper bridge arm circuit, the other end Be connected with one end of third capacitor, the other end of third capacitor is connected with the second end of lower bridge arm circuit, the second capacitor it is another End and one end of third capacitor are grounded.
Optionally, further includes:
Direct current third port, comprising: the 5th switch, unidirectional DC/DC circuit, backward dioded and photovoltaic array, wherein
The first end of 5th switch is connected with the first end of upper bridge arm circuit, the second end phase of second end and lower bridge arm circuit Even, third end is connected with the first output end of unidirectional DC/DC circuit, the second output terminal phase at the 4th end and unidirectional DC/DC circuit Even;
The first input end of unidirectional DC/DC circuit is connected with the cathode of backward dioded;
The anode of backward dioded is connected with the first output end of photovoltaic array;
The second output terminal of photovoltaic array is connected with the second input terminal of unidirectional DC/DC circuit.
Optionally, the pilot controller includes: communication unit, processor, driving unit, sampling unit and balanced list Member, wherein
Communication unit is connected with processor, and processor is also connected with driving unit, sampling unit and balanced unit respectively, Sampling unit and balanced unit are also connected with each battery in battery pack respectively.
Sampling unit is sampled for the status information to each battery in battery pack, the battery that sampling is obtained Status information export to processor;
Processor receives the status information of each battery of sampling unit output, obtains and is higher than default electricity threshold in battery pack The electricity exception battery of value, notice balanced unit is in electricity exception battery the two poles of the earth and the mode of the bypass resistance of the United Nations General Assembly's resistance value, in fact The power equalization of each battery in existing battery pack;
The status information of each battery according to detection calculates the power information of bridge arm submodule, and should by what is be calculated The power information of bridge arm submodule reports to master controller by communication unit;
Receive the equal power information that master controller is issued by communication unit, output to driving unit;
Driving unit receives equal power information, raw according to the power information and equal power information of bridge arm submodule The dump power of pairs of bridge arm submodule carries out the control signal of Balance route, and using in control signal control bridge arm submodule Switching tube on-off duration so that the dump power of each bridge arm submodule is balanced.
Optionally, the quantity of the power assembly system is 2, and two power assembly systems pass through the direct current second Port is connected, and to realize, charging, two power assembly systems pass through the switching tube in respective bridge arm submodule respectively mutually Realize the charge and discharge of battery in corresponding bridge arm submodule.
A kind of power assembly system based on modular multi-level converter provided by the embodiments of the present application, it is total by being arranged Controller detects the power information of each port, the power for the battery pack that the power information and pilot controller according to detection upload Information, determines the equal power information of each bridge arm submodule respectively, and make pilot controller according to battery pack power information with And equal power information, the control signal that Balance route is carried out to the dump power of bridge arm submodule is generated, to utilize control Signal controls the on-off of the switching tube in corresponding bridge arm submodule, controls the dump power of the bridge arm submodule;Meanwhile Status information of the pilot controller according to each battery of detection, realizes each battery in the battery pack by way of bypass resistance Remaining capacity Balance route.In this way, each bridge arm submodule can be realized without being modified to the circuit structure of power assembly system The power equalization of battery between block and in bridge arm submodule promotes battery equilibrium ability in power assembly system, so that dynamic The output of power assembly system is stablized, and is improved the stability of power assembly system operation, is effectively improved power assembly system internally-powered The service life of element and service efficiency.
To enable the above objects, features, and advantages of the application to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate Appended attached drawing, is described in detail below.
Detailed description of the invention
Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached Figure is briefly described, it should be understood that the following drawings illustrates only some embodiments of the application, therefore is not construed as pair The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this A little attached drawings obtain other relevant attached drawings.
Fig. 1 is the power assembly system structural representation provided by the embodiments of the present application based on modular multi-level converter Figure;
Fig. 2 is bridge arm sub-modular structure schematic diagram provided by the embodiments of the present application;
Fig. 3 is battery pack structure schematic diagram provided by the embodiments of the present application;
Fig. 4 is the attachment structure schematic diagram of master controller provided by the embodiments of the present application and pilot controller;
Fig. 5 is pilot controller structural schematic diagram provided by the embodiments of the present application.
Specific embodiment
To keep the purposes, technical schemes and advantages of the embodiment of the present application clearer, below in conjunction with the embodiment of the present application Middle attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only It is some embodiments of the present application, instead of all the embodiments.The application being usually described and illustrated herein in the accompanying drawings is real The component for applying example can be arranged and be designed with a variety of different configurations.Therefore, below to the application's provided in the accompanying drawings The detailed description of embodiment is not intended to limit claimed scope of the present application, but is merely representative of the selected reality of the application Apply example.Based on embodiments herein, those skilled in the art institute obtained without making creative work There are other embodiments, shall fall in the protection scope of this application.
Fig. 1 is the power assembly system structural representation provided by the embodiments of the present application based on modular multi-level converter Figure.As shown in Figure 1, the power assembly system includes: exchange first port 11, exchange second port 12, the phase of multiple parallel connections electricity Road 13, direct current first port 14, direct current second port 15, pilot controller (not shown) and master controller are (in figure not Show), wherein every circuitry phase 13 includes: upper bridge arm circuit and lower bridge arm circuit, wherein the second end of upper bridge arm circuit with The first end of lower bridge arm circuit cascades;
Exchange first port 11 by first switch (S1) connect upper bridge arm circuit second end and lower bridge arm circuit the Between one end, for external first alternating current equipment output power or from the first alternating current equipment input power;
Exchange second port 12 connects the second end in upper bridge arm circuit by inversion inductor (Lac) and second switch (S2) Between the first end of lower bridge arm circuit, for external second alternating current equipment output power or from the second alternating current equipment input power;
Direct current first port 14 connects the first end in upper bridge arm circuit by third switch (S3) and two-way DC/DC circuit Between the second end of lower bridge arm circuit, for external first DC equipment output power or from the first DC equipment input power;
Direct current second port 15 by the 4th switch (S4) connect upper bridge arm circuit first end and lower bridge arm circuit the Between two ends, for external second DC equipment output power or from the second DC equipment input power;
Upper bridge arm circuit and lower bridge arm circuit include multiple cascade bridge arm submodules (SM) and bridge arm inductance (Lap, Lbp, Lcp, Lan, Lbn, Lcn), each bridge arm submodule include: capacitor, battery pack and multiple switch pipe, Duo Gekai For Guan Guanyu capacitance group at full-bridge circuit, capacitor is in parallel with battery pack;
Pilot controller is connected with bridge arm submodule;
Master controller, respectively with exchange first port, exchange second port, direct current first port, direct current second port with And pilot controller is connected.
In the embodiment of the present application, status information of the pilot controller to detect each battery in battery pack, according to detection The status information of each battery realizes the remaining capacity Balance route of each battery in the battery pack by way of bypass resistance, according to According to the status information of each battery, the power information of battery pack, output to master controller are obtained;
Master controller, for detecting exchange first port, exchange second port, direct current first port, direct current second port Power information each bridge arm is determined based on the power information that the obtained power information of detection and pilot controller upload respectively The equal power information of submodule, and export to corresponding pilot controller, so that the pilot controller is according to the battery obtained The power information and equal power information of packet generate the control letter of the on-off duration for controlling switching tube in bridge arm submodule Number, so that the dump power of each bridge arm submodule is balanced.
In the embodiment of the present application, every one-phase circuit forms a phase level current transformer.
In the embodiment of the present application, by the way that master controller is arranged, the power information of each port can detecte, the function according to detection The power information for the battery pack that rate information and pilot controller upload determines the equal power letter of each bridge arm submodule respectively Breath, and make power information and equal power information of the pilot controller according to battery pack, generate the residue to bridge arm submodule Power carries out the control signal of Balance route, to control the logical of the switching tube in corresponding bridge arm submodule using control signal It is disconnected, the dump power of the bridge arm submodule is controlled;Meanwhile the state using pilot controller according to each battery of detection Information realizes the remaining capacity Balance route of each battery in the battery pack by way of bypass resistance.In this way, without to power The circuit structure of assembly system is modified the function that the battery between each bridge arm submodule and in bridge arm submodule can be realized Rate is balanced, so that power assembly system output is stablized, improves the stability of power assembly system operation, it is total to effectively improve power Service life and service efficiency at system internally-powered element.Further, by configuring different exchange ends for power assembly system Mouth and DC port, the AC port and DC port of configuration can be realized the bi-directional matching of different capacity, so as to The operation demand for enough meeting distinct device, by the function and type of each port of flexible configuration, enable power assembly system is used In different type power drive and energy management scene;Moreover, the multiple switch pipe and capacitance group in bridge arm submodule are at full-bridge Circuit can be adjusted the output power size of bridge arm submodule by adjusting the on-off duration of full-bridge circuit, be formed more The power output of sample can satisfy the equipment operation of different capacity demand.
In the embodiment of the present application, as an alternative embodiment, the quantity of circuitry phase is three, the corresponding phase of every one-phase circuit Level current transformer, comprising: the first phase level current transformer, the second phase level current transformer and third phase level current transformer.
In the embodiment of the present application, as an alternative embodiment, upper bridge arm circuit includes multiple upper bridge arm being sequentially connected in series Module and upper bridge arm inductance;Lower bridge arm circuit includes the multiple lower bridge arm submodules and lower bridge arm inductance being sequentially connected in series;
Exchange first port is connect between upper bridge arm inductance and lower bridge arm inductance by first switch;
The first end of exchange second port is connected with inversion inductor, second end connect by second switch in upper bridge arm inductance and Between lower bridge arm inductance.
In the embodiment of the present application, as an alternative embodiment, upper bridge arm submodule is identical as lower bridge arm sub-modular structure, the The structure of one phase level current transformer, the second phase level current transformer and third phase level current transformer is also identical.
By taking the first phase level current transformer as an example, including bridge arm circuit on first and be connected with bridge arm circuit on first first Lower bridge arm circuit, bridge arm circuit may include 16 upper bridge arm submodules and one upper bridge arm inductance (Lap) on first, under first Bridge arm circuit includes 16 lower bridge arm submodules and a lower bridge arm inductance (Lan).Wherein, 16 upper bridge arm submodules are labeled as SM1-SM16,16 lower bridge arm submodules are labeled as SM17-SM32.Wherein, SM1 to SM16 is successively cascaded, SM1 (anode output End, i.e., the first end of upper bridge arm circuit: Udc+) be connected with the anode of direct current first port, SM16 also with upper bridge arm inductance one End is connected, and the other end of upper bridge arm inductance is connected with one end of lower bridge arm inductance, and the other end of lower bridge arm inductance is connected with SM17, SM17-SM32 is successively cascaded, SM32 (cathode output end, the i.e. second end of lower bridge arm circuit: Udc-) also with direct current first port Cathode be connected.
Fig. 2 is bridge arm sub-modular structure schematic diagram provided by the embodiments of the present application.As shown in Fig. 2, bridge arm submodule includes: First switch tube (T1), second switch (T2), third switching tube (T3), the 4th switching tube (T4), first capacitor (C), first Diode (D1), the second diode (D2), third diode (D3), the 4th diode (D4) and battery pack (B), wherein
The collector of first switch tube respectively with the collector of second switch, the cathode of first diode, first capacitor One end and battery pack anode be connected;
The emitter of first switch tube is connected with the anode of the collector of third switching tube and first diode respectively;
The emitter of third switching tube respectively with the emitter of the 4th switching tube, the anode of third diode, first capacitor The other end and battery pack cathode be connected;
The cathode of third diode is connected with the collector of third switching tube;
The emitter of second switch is connected with the anode of the collector of the 4th switching tube and the second diode respectively;
The cathode of second diode is connected with the collector of second switch;
The cathode of 4th diode is connected with the collector of the 4th switching tube, the emitter phase of anode and the 4th switching tube Even;
First switch tube, second switch, third switching tube, the 4th switching tube base stage incoming control signal;
First end of the emitter of first switch tube as cascade bridge arm submodule, the emitter conduct of second switch The second end of cascade bridge arm submodule, and be connected with the first end of next cascade bridge arm submodule.
In the embodiment of the present application, first switch tube, second switch, third switching tube, the 4th switching tube and first capacitor H-bridge circuit is formed, bridge arm submodule is constituted after battery pack is in parallel with the first capacitor of H-bridge circuit.In this way, by battery pack two First capacitor extremely in parallel, it is possible to prevente effectively from (internal resistance of battery is typically small, if voltage for the voltage fluctuation on bridge arm submodule Fluctuation is big, and it is larger to will lead to the electric current in internal resistance) it may cause the generation that battery burns phenomenon.
In the embodiment of the present application, as an alternative embodiment, the first switch tube and third are directed toward in bridge arm current direction When the tie point of switching tube, first switch tube and the 4th switching tube are connected, the charging to battery pack may be implemented, correspondingly, When second switch and third switching tube are connected, the electric discharge to battery pack may be implemented.In first switch tube and second switch Pipe conducting or, when third switching tube and the 4th switching tube are connected, the isolation to bridge arm submodule may be implemented.
When the tie point of second switch and the 4th switching tube, second switch and third switch are directed toward in bridge arm current direction Pipe conducting, charges to battery pack, and first switch tube and the conducting of the 4th switching tube discharge to battery pack.
In the embodiment of the present application, if switching tube is in electroless state, as an alternative embodiment, go out in bridge arm submodule Now after exception or failure, in order to be effectively isolated the bridge arm submodule, which can also include:
Bipolar diode (not shown), including the 5th diode and the 6th diode, the 5th diode and Six diodes in reverse series, wherein the anode of the 5th diode is connected with the first end of bridge arm submodule, and the 5th diode is born Pole is connected with the cathode of the 6th diode, and the anode of the 6th diode is connected with the second end of bridge arm submodule.In this way, ambipolar In parallel bridge arm submodule carries out overvoltage protection to diode pair therewith, when bridge arm submodule exception or failure and not can be effectively controlled When the on-off of switching tube, by the way that bipolar diode is connected, removes this and be abnormal or the bridge arm submodule of failure.
In the embodiment of the present application, all bridge arm submodules in each phase level current transformer are sequentially connected in series sub- Xiang Mo The sub- phase module of block, each phase level current transformer composes in parallel submodule port.
In the embodiment of the present application, as an alternative embodiment, controlling signal is that pulse width modulates (PWM, Pulse Width Modulation) signal, master controller by obtain exchange first port, exchange second port, direct current first port, The power information for the battery pack that the power information and pilot controller of direct current second port upload, determines each bridge arm submodule Equal power information, and export to corresponding pilot controller, so that the pilot controller generates the PWM letter of duty ratio corresponding Number, the on-off duration that can control the switching tube in bridge arm submodule realizes battery pack to control the voltage at capacitor both ends Charge or discharge.For example, according to exchange first port, the exchange second port, direct current first port, direct current second end obtained The status information for each battery that the power information and pilot controller of mouth upload, determines the battery pack needed in bridge arm submodule When outside output power, by the equal power information of each bridge arm submodule of determination, so that pilot controller controls capacitor both ends Voltage be lower than battery pack voltage so that battery pack discharge.And according to obtain exchange first port, exchange second port, The power information for the battery pack that direct current first port, the power information of direct current second port and pilot controller upload determines When needing to charge to the battery pack in bridge arm submodule, by the equal power information of each bridge arm submodule of determination, so that The voltage that pilot controller controls capacitor both ends is higher than battery pack voltage, charges to battery pack, to realize bridge arm submodule Power equalization between block.
Fig. 3 is battery pack structure schematic diagram provided by the embodiments of the present application.As shown in figure 3, in the embodiment of the present application, it is multiple Cascade battery module constitutes battery pack, and each battery module includes the battery of multiple parallel connections.The quantity and electricity of battery parallel connection The quantity of pond block coupled in series can determine jointly according to series of factors such as spatial volume, heat dissipation and economic costs.The application is implemented In example, pilot controller can use battery management system (BMS, Battery Management System) technology, pass through inspection The status information of each battery in battery pack is surveyed, for example, information of voltage, current information etc., determine the electricity of the remaining battery, is led to Current integration method, open circuit voltage method, Kalman filtering method or neural network algorithm etc. are crossed, is preset to obtain and be higher than in battery pack The electricity exception battery of power threshold is realized by way of the bypass resistance at electricity exception battery the two poles of the earth and the United Nations General Assembly's resistance value The power (remaining capacity) of each battery is balanced in battery pack.
In the embodiment of the present application, as an alternative embodiment, driving to motor can be realized and should by exchanging first port Motor power feedback, i.e., by the on-off duration of switching tube in control bridge arm submodule come control bridge armlet stream and ac-side current Size, exchange first port formed pressure drop, generate charging and discharging currents, achieve the purpose that Power Exchange.
In the embodiment of the present application, as an alternative embodiment, exchanging second port can be with external alternating-current charging pile or electricity Net is connected, and by the exchange second port, can carry out AC charging for power assembly system.Wherein, Lac is grid-connected inverters institute The inductance needed, it is assumed that exchange side network voltage is u1, and current transformer output voltage is adjustable u2 in power assembly system.This implementation In example, by controlling the size of u2, u1 and u2 is set to generate voltage difference, so that generating pressure drop on Lac, pressure drop generates electric current.Thus, By controlling the size of u2, the size and Orientation of electric current on Lac can control, so as to control bridge in the lateral current transformer of exchange Arm circuit charging, alternatively, bridge arm circuit is discharged to exchange side in current transformer.
In the embodiment of the present application, the difference of the output voltage of the output voltage and lower bridge arm submodule of upper bridge arm submodule is The alternating voltage of AC port.In practical application, the other AC ports of setting can also be extended.
In the embodiment of the present application, as an alternative embodiment, direct current first port is with the side of DC voltage and DC current Formula provides electric power to interior air-conditioning and ancillary equipment, can also realize the energy feedback of ancillary equipment.Wherein, two-way DC/DC electricity Road carries out DC voltage conversion, to meet the power demands of ancillary equipment.
In the embodiment of the present application, as another alternative embodiment, the two-way DC/DC circuit of direct current first port may be Power assembly system charging.
In the embodiment of the present application, as an alternative embodiment, direct current second port is connected with direct-current charging post, straight by this Second port is flowed, DC charging can be carried out for power assembly system.
In the embodiment of the present application, the output voltage of the output voltage and lower bridge arm submodule of upper bridge arm submodule and, be The DC voltage of DC port.By the way that different DC ports are arranged, the operation demand of distinct device can satisfy.For example, can be with Different DC ports is set and corresponds to different power consumptions, for example, the two-way DC/DC circuit in the first DC port may incite somebody to action The 600V decompression of bridge arm circuit output is at 12V, while the electric current exported is also little;Second DC port can be bridge arm circuit The 750V decompression of output is 600V, and the electric current of super charging may be 300A.
In the embodiment of the present application, as another alternative embodiment, can also to the direct current that power assembly system exports or The direct current for being input to power assembly system is filtered, to reduce the ripple disturbance of direct current, thus, the power assembly system Further include:
Second capacitor 16 and third capacitor 17, the second capacitor 16 are connected with third capacitor 17, one end of the second capacitor 16 It is connected with the first end of upper bridge arm circuit, the other end is connected with one end of third capacitor 17, and the other end of third capacitor 17 is under The second end of bridge arm circuit is connected, and the other end of the second capacitor 16 and one end of third capacitor 17 are grounded.
In the embodiment of the present application, as yet another alternative embodiment, external photovoltaic power generation can also be accessed, to battery Packet charges, thus, the power assembly system further include:
Direct current third port (not shown), comprising: the 5th switch (S5), unidirectional DC/DC circuit, backward dioded with Photovoltaic (PV, Photovoltaics) array, wherein
The first end of 5th switch is connected with the first end of upper bridge arm circuit, the second end phase of second end and lower bridge arm circuit Even, third end is connected with the first output end of unidirectional DC/DC circuit, the second output terminal phase at the 4th end and unidirectional DC/DC circuit Even;
The first input end of unidirectional DC/DC circuit is connected with the cathode of backward dioded;
The anode of backward dioded is connected with the first output end of photovoltaic array;
The second output terminal of photovoltaic array is connected with the second input terminal of unidirectional DC/DC circuit.
In the embodiment of the present application, by direct current third port, the photovoltaic power generation of photovoltaic array can use, be power assembly System carries out photovoltaic charged.
Fig. 4 is the attachment structure schematic diagram of master controller provided by the embodiments of the present application and pilot controller.Such as Fig. 4 institute Show, in the embodiment of the present application, master controller and each port (including DC port and AC port) and each pilot controller lead to Letter detects the power information of each port and receives the power information for the battery pack that each pilot controller reports, each auxiliary control Device processed is communicated with a bridge arm submodule, detects the status information of each battery in the bridge arm submodule, each battery according to detection Status information carries out Power balance control to the battery in the bridge arm submodule;The status information of each battery according to detection, meter The power information of the bridge arm submodule (battery pack) is calculated, and the power information for the bridge arm submodule being calculated is reported to always Controller.
In the embodiment of the present application, master controller can be according to the device type being connected with port (for example, a type of end Mouth can only be connected with the equipment of certain type), determine the working condition of power assembly system.For example, having detected electronic vapour When vehicle charging pile is inserted into certain Single port, determines that the power assembly system is in charged state, do not allow to output power of motor, then Enable signal is exported, the switch of motor corresponding ports is turned off.
Fig. 5 is pilot controller structural schematic diagram provided by the embodiments of the present application.As shown in figure 5, in the embodiment of the present application, Each bridge arm submodule is correspondingly arranged on a pilot controller, pilot controller include: communication unit, processor, driving unit, Sampling unit and balanced unit, wherein
Communication unit is connected with processor, and processor is also connected with driving unit, sampling unit and balanced unit respectively, Sampling unit and balanced unit are also connected with each battery in battery pack respectively.
Sampling unit is sampled for the status information to each battery in battery pack, the battery that sampling is obtained Status information export to processor;
Processor receives the status information of each battery of sampling unit output, obtains and is higher than default electricity threshold in battery pack The electricity exception battery of value, notice balanced unit is in electricity exception battery the two poles of the earth and the mode of the bypass resistance of the United Nations General Assembly's resistance value, in fact The power equalization of each battery in existing battery pack;
The status information of each battery according to detection calculates the power information of bridge arm submodule, and should by what is be calculated The power information of bridge arm submodule reports to master controller by communication unit;
Receive the equal power information that master controller is issued by communication unit, output to driving unit;
Driving unit receives equal power information, raw according to the power information and equal power information of bridge arm submodule The dump power of pairs of bridge arm submodule carries out the control signal of Balance route, and using in control signal control bridge arm submodule Switching tube on-off duration so that the dump power of each bridge arm submodule is balanced.
In the embodiment of the present application, sampling unit acquisition bridge arm submodule corresponds to battery module voltages, electric current in battery pack, Judge between battery module whether balancing energy enables balanced single if there is unbalanced phenomena by processor comparative analysis Unbalanced battery module is discharged member by parallel resistance or by-pass switch bypasses, and realizes in battery pack between each battery module Passive type balancing energy.
In the embodiment of the present application, master controller is poor by upper and lower bridge arm circuit energy and control, upper and lower bridge arm circuit energy Function is determined in control, bridge arm circuit loop current suppression, bridge arm submodule capacitor voltage sort algorithm, the control of DC bus constant voltage, exchange Rate control, nearest level approximatioss or phase-shifting carrier wave modulation etc. determine the equal power of each bridge arm submodule port, so that each bridge The dump power of arm submodule port reaches balance.
In conjunction with Fig. 4 and Fig. 5, in the embodiment of the present application, it is assumed that exchange first port exports rated power X, rated power X It for driving motor, exchanges second port and does not work, (voltage is to interior air-conditioning, warms up direct current first port output 12V The load supplyings such as gas, defrosting, cigar lighter, phone charger, load inactive, do not consume power), direct current second port not work Make, direct current third port input power Y.Each equipment is working properly in power assembly system.
Master controller inside acquisition power assembly system with external information, such as each port working state, port by connecing Enter device type, port voltage electric current (power) etc..Judge whether power assembly system is in failure shape according to the information of acquisition State performs the next step if fault-free occurs, if being in malfunction, judges after cutting off non-working port, power assembly system Whether can continue to run, if so, performing the next step, otherwise shut down.
The input power Y that the rated power X exported and direct current third port are needed according to exchange first port, calculates and hands over The gross output that stream first port needs to export are as follows: X-Y, and the power information according to each bridge arm submodule utilize upper and lower bridge Arm circuit energy and control methods carry out Power balance control, distribute equal power for each bridge arm submodule, wherein may be one The equal power of bridge arm submodule distribution is divided to be negative (for example, dump power of the dump power of the bridge arm submodule lower than statistics Mean value is more), it indicates to need to charge to the battery pack of the bridge arm submodule.
The output power instruction value comprising corresponding equal power information is sent to each pilot controller, passes through and sends enabled letter Number disconnect exchange second port switch, and, send enable signal disconnect direct current second port.
Pilot controller calculates the output mean power of bridge arm submodule, obtains corresponding bridge after being superimposed output power instruction value The pwm signal of switching tube in arm submodule.
Utilize the switching tube of obtained pwm signal driving bridge arm submodule.
In the embodiment of the present application, battery information that secondary processor is acquired according to sampling unit, bridge arm submodule capacitor electricity The information such as the power instruction that pressure, bridge arm submodule electric current and master controller issue, calculate H-bridge circuit in corresponding bridge arm submodule Switch state sends switching drive signal (pwm signal) by driving unit, is guaranteeing bridge arm submodule port gross output Under the premise of issuing instruction value equal to master controller, using capacitor in bridge arm submodule, the energy difference between each battery pack is shifted It is different, realize the active balancing energy between the battery pack of each bridge arm submodule.
In the embodiment of the present application, as an alternative embodiment, master controller and pilot controller be can be at signal The IC chip of reason ability.IC chip can be general processor, including central processing unit (CPU, Central Processing Unit), network processing unit (NP, Network Processor) etc.;It can also be digital signal processor (DSP, Digital Signal Processing), specific integrated circuit (ASIC, Application Specific Integrated Circuit), field programmable gate array (FPGA, Field-Programmable Gate Array), other Programmable logic device, discrete gate, transistor logic, discrete hardware components etc..
In the embodiment of the present application, as an alternative embodiment, switching tube includes but is not limited to: triode, field-effect tube, crystalline substance Body pipe and the electronic device or integrated circuit of other open and-shut mode switchings that circuit may be implemented.
In the embodiment of the present application, each power assembly system can also be connected mutual between each power assembly system to realize Mutually charge.For example, the quantity of power assembly system is 2, two power assembly systems are connected by direct current second port with reality Now charging mutually, two power assembly systems pass through the switching tube in respective bridge arm submodule respectively and realize corresponding bridge arm submodule The charge and discharge of interior battery.
In embodiment provided herein, it should be understood that disclosed device and method, it can be by others side Formula is realized.The apparatus embodiments described above are merely exemplary, for example, the division of the unit, only one kind are patrolled Function division is collected, there may be another division manner in actual implementation, in another example, multiple units or components can combine or can To be integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual Coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some communication interfaces, device or unit It connects, can be electrical property, mechanical or other forms.
The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.
In addition, each functional unit in embodiment provided by the present application can integrate in one processing unit, it can also To be that each unit physically exists alone, can also be integrated in one unit with two or more units.
It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product It is stored in a computer readable storage medium.Based on this understanding, the technical solution of the application is substantially in other words The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a People's computer, server or network equipment etc.) execute each embodiment the method for the application all or part of the steps. And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing, in addition, term " the One ", " second ", " third " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
Finally, it should be noted that embodiment described above, the only specific embodiment of the application, to illustrate the application Technical solution, rather than its limitations, the protection scope of the application is not limited thereto, although with reference to the foregoing embodiments to this Shen It please be described in detail, those skilled in the art should understand that: anyone skilled in the art Within the technical scope of the present application, it can still modify to technical solution documented by previous embodiment or can be light It is readily conceivable that variation or equivalent replacement of some of the technical features;And these modifications, variation or replacement, do not make The essence of corresponding technical solution is detached from the spirit and scope of the embodiment of the present application technical solution.The protection in the application should all be covered Within the scope of.Therefore, the protection scope of the application shall be subject to the protection scope of the claim.

Claims (10)

1. a kind of power assembly system based on modular multi-level converter, the power assembly system include:
Exchange first port, exchange second port, the circuitry phase of multiple parallel connections, direct current first port, direct current second port, auxiliary Controller and master controller, wherein every circuitry phase includes: upper bridge arm circuit and lower bridge arm circuit, wherein upper bridge arm circuit Second end and lower bridge arm circuit first end cascade;
Exchange first port is connect between the second end of upper bridge arm circuit and the first end of lower bridge arm circuit by first switch, is External first alternating current equipment output power or from the first alternating current equipment input power;
Exchange second port connects the second end and lower bridge arm circuit in upper bridge arm circuit by inversion inductor and second switch Between first end, for external second alternating current equipment output power or from the second alternating current equipment input power;
Direct current first port is switched by third and two-way DC/DC circuit connects first end and the lower bridge arm electricity in upper bridge arm circuit Between the second end on road, for external first DC equipment output power or from the first DC equipment input power;
Direct current second port is connect between the first end of upper bridge arm circuit and the second end of lower bridge arm circuit by the 4th switch, is External second DC equipment output power or from the second DC equipment input power;
Upper bridge arm circuit and lower bridge arm circuit include multiple cascade bridge arm submodules and bridge arm inductance, each bridge arm Module includes: capacitor, battery pack and multiple switch pipe, and multiple switch pipe and capacitance group are at full-bridge circuit, capacitor and battery pack It is in parallel;
Pilot controller is connected with bridge arm submodule;
Master controller, respectively with exchange first port, exchange second port, direct current first port, direct current second port and auxiliary Controller is helped to be connected.
2. power assembly system as described in claim 1, which is characterized in that the upper bridge arm circuit include be sequentially connected in series it is more A upper bridge arm submodule and upper bridge arm inductance;Lower bridge arm circuit includes the multiple lower bridge arm submodules being sequentially connected in series and lower bridge arm electricity Sense;
Exchange first port is connect between upper bridge arm inductance and lower bridge arm inductance by first switch;
The first end of exchange second port is connected with inversion inductor, and second end is connect by second switch in upper bridge arm inductance and lower bridge Between arm inductance.
3. power assembly system as described in claim 1, which is characterized in that the bridge arm submodule include: first switch tube, Second switch, third switching tube, the 4th switching tube, first capacitor, first diode, the second diode, third diode, Four diodes and battery pack, wherein
The collector of first switch tube respectively with the collector of second switch, the cathode of first diode, first capacitor one The anode of end and battery pack is connected;
The emitter of first switch tube is connected with the anode of the collector of third switching tube and first diode respectively;
The emitter of third switching tube respectively with the emitter of the 4th switching tube, the anode of third diode, first capacitor it is another The cathode of one end and battery pack is connected;
The cathode of third diode is connected with the collector of third switching tube;
The emitter of second switch is connected with the anode of the collector of the 4th switching tube and the second diode respectively;
The cathode of second diode is connected with the collector of second switch;
The cathode of 4th diode is connected with the collector of the 4th switching tube, and anode is connected with the emitter of the 4th switching tube;
First switch tube, second switch, third switching tube, the 4th switching tube base stage incoming control signal;
First end of the emitter of first switch tube as cascade bridge arm submodule, the emitter of second switch is as cascade Bridge arm submodule second end, and be connected with the first end of next cascade bridge arm submodule.
4. power assembly system as claimed in claim 3, which is characterized in that when the first switch is directed toward in bridge arm current direction The tie point of pipe and third switching tube, the first switch tube and the conducting of the 4th switching tube, charge to battery pack, and described the Two switching tubes and the conducting of third switching tube, discharge to battery pack, first switch tube and second switch conducting or, the Three switching tubes and the conducting of the 4th switching tube, are isolated bridge arm submodule.
5. power assembly system as claimed in claim 3, which is characterized in that the bridge arm submodule further include:
Bipolar diode, including the 5th diode and the 6th diode, the 5th diode and the 6th diodes in reverse series, Wherein, the anode of the 5th diode is connected with the first end of bridge arm submodule, the cathode of the 5th diode and the 6th diode Cathode is connected, and the anode of the 6th diode is connected with the second end of bridge arm submodule.
6. power assembly system as claimed in claim 3, which is characterized in that the battery pack includes multiple cascade battery moulds Block, each battery module include the battery of multiple parallel connections.
7. such as power assembly system as claimed in any one of claims 1 to 6, which is characterized in that further include: the second capacitor and the Three capacitors, wherein
Second capacitor is connected with third capacitor, and one end of the second capacitor is connected with the first end of upper bridge arm circuit, the other end and One end of three capacitors is connected, and the other end of third capacitor is connected with the second end of lower bridge arm circuit, the other end of the second capacitor and One end of third capacitor is grounded.
8. power assembly system as claimed in claim 7, which is characterized in that further include:
Direct current third port, comprising: the 5th switch, unidirectional DC/DC circuit, backward dioded and photovoltaic array, wherein
The first end of 5th switch is connected with the first end of upper bridge arm circuit, and second end is connected with the second end of lower bridge arm circuit, Third end is connected with the first output end of unidirectional DC/DC circuit, and the 4th end is connected with the second output terminal of unidirectional DC/DC circuit;
The first input end of unidirectional DC/DC circuit is connected with the cathode of backward dioded;
The anode of backward dioded is connected with the first output end of photovoltaic array;
The second output terminal of photovoltaic array is connected with the second input terminal of unidirectional DC/DC circuit.
9. such as power assembly system as claimed in any one of claims 1 to 6, which is characterized in that the pilot controller includes: logical Believe unit, processor, driving unit, sampling unit and balanced unit, wherein
Communication unit is connected with processor, and processor is also connected with driving unit, sampling unit and balanced unit respectively, sampling Unit and balanced unit are also connected with each battery in battery pack respectively;
Sampling unit is sampled for the status information to each battery in battery pack, the shape for the battery that sampling is obtained State information is exported to processor;
Processor receives the status information of each battery of sampling unit output, obtains and is higher than default power threshold in battery pack Electricity exception battery, notice balanced unit realize electricity in electricity exception battery the two poles of the earth and the mode of the bypass resistance of the United Nations General Assembly's resistance value Wrap the power equalization of interior each battery in pond;
The status information of each battery according to detection calculates the power information of bridge arm submodule, and the bridge arm that will be calculated The power information of submodule reports to master controller by communication unit;
Receive the equal power information that master controller is issued by communication unit, output to driving unit;
Driving unit receives equal power information, according to the power information and equal power information of bridge arm submodule, generation pair The dump power of bridge arm submodule carries out the control signal of Balance route, and utilizes opening in control signal control bridge arm submodule The on-off duration of pipe is closed, so that the dump power of each bridge arm submodule is balanced.
10. such as power assembly system as claimed in any one of claims 1 to 6, which is characterized in that the number of the power assembly system Amount is 2, and two power assembly systems are connected to realize charging mutually by the direct current second port, and two described dynamic Power assembly system realizes the charge and discharge of battery in corresponding bridge arm submodule by the switching tube in respective bridge arm submodule respectively.
CN201821624240.9U 2018-09-27 2018-09-27 A kind of power assembly system based on modular multi-level converter Active CN208638266U (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110138011A (en) * 2019-06-05 2019-08-16 合肥工业大学 The modular power balance control method of tandem photovoltaic solid-state transformer

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110138011A (en) * 2019-06-05 2019-08-16 合肥工业大学 The modular power balance control method of tandem photovoltaic solid-state transformer
CN110138011B (en) * 2019-06-05 2020-06-30 合肥工业大学 Module power balance control method of cascaded photovoltaic solid-state transformer

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