CN219372300U - Multi-converter system and power supply system - Google Patents
Multi-converter system and power supply system Download PDFInfo
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- CN219372300U CN219372300U CN202320160993.3U CN202320160993U CN219372300U CN 219372300 U CN219372300 U CN 219372300U CN 202320160993 U CN202320160993 U CN 202320160993U CN 219372300 U CN219372300 U CN 219372300U
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Abstract
The utility model discloses a multi-converter system and a power supply system, which relate to the field of converter control and comprise a plurality of converters and corresponding communication modules, wherein the converters are sequenced according to a preset sequence, the converters are connected with electric energy storage media in one-to-one correspondence, the converters are positioned between a direct current bus and the electric energy storage media, the communication modules corresponding to adjacent converters are connected with each other, the communication modules are used for sending carrier synchronous signals of the converters to the adjacent communication modules and receiving carrier synchronous signals of other converters, and the converters adjust carrier phase shifting angles in the converters based on the carrier synchronous signals. Through the mode of synchronizing the carriers of the converters, the converters can flexibly configure the parallel number of the converters and the synchronous carrier phase shift angle according to application scenes, the requirements of large capacity and large power can be met, and meanwhile, the current ripple is ensured to be at a lower level, so that the reliability of a power supply system is ensured.
Description
Technical Field
The present utility model relates to the field of inverter control, and in particular, to a multi-inverter system and a power supply system.
Background
A power supply system refers to a device for supplying electric energy to other devices, and is generally composed of elements such as an energy storage medium and an inverter, and for a DC-DC power supply system, a single DC-DC inverter cannot generally meet the requirements of the power supply system for large capacity and large power due to the limitation of rated current of the DC-DC inverter. Currently, in order to apply the converter in higher capacity and power supply systems, a plurality of DC-DC converters are typically arranged between the DC bus of the power supply and the electrical energy storage medium (e.g. battery or super capacitor, etc.). Although the power supply system can ensure the requirements of the power supply system on capacity and power, when the power supply system is applied to different scenes, the power supply system has different requirements on power, so that the number of actually arranged DC-DC converters is also different, and when the number of actually arranged converters is changed, the carrier phase shift angle of each converter is different, so that the current ripple is changed, and the reliability of the power supply system is affected.
Disclosure of Invention
The utility model aims to provide a multi-converter system and a power supply system, which can ensure that the carrier phase shift angles of all converters are the same, and ensure that current ripple is at a lower level, thereby ensuring the reliability of the power supply system.
To solve the above technical problems, the present utility model provides a multiple conversion system, including:
n converters ordered according to a preset sequence, wherein n is an integer not less than 2;
n communication modules connected with the converters in a one-to-one correspondence manner;
the n converters are connected with n electric energy storage media in the power supply system in a one-to-one correspondence manner, the high-voltage side of each converter is connected with a direct current bus in the power supply system, and the low-voltage side of each converter is connected with the power supply end of the corresponding electric energy storage medium of each converter;
the communication modules corresponding to any two adjacent converters are connected with each other;
the communication module is used for sending the carrier synchronization signals of the corresponding converters to the adjacent communication modules and sending the received carrier synchronization signals of other converters to the corresponding converters of the communication module;
the converter is used for charging the electric energy storage medium and discharging the direct current bus, and adjusting the carrier phase shift angle of the converter according to the carrier synchronization signal.
Preferably, the method further comprises:
n first switches and n second switches;
the n first switches and the n second switches are in one-to-one correspondence with the n converters;
the first switch is arranged between the high-voltage side of the converter corresponding to the first switch and the direct-current bus;
the second switch is arranged between the low-voltage side of the converter corresponding to the second switch and the electric energy storage medium;
the first switch and the second switch are each configured to open when the electrical energy storage medium is charged and discharged and to close when the electrical energy storage medium is not charged and discharged.
Preferably, the method further comprises:
n switch controllers corresponding to the n converters one by one;
one end of the switch controller is connected with the high-voltage side of the converter, the other end of the switch controller is connected with the low-voltage side of the converter, the control ends of the switch controller are respectively connected with the control ends of the first switch and the second switch, and the switch controller is used for controlling the first switch and the second switch to be opened when the electric energy storage medium is charged and discharged and closed when the electric energy storage medium is not charged and discharged according to the voltage at the converter.
Preferably, the first switch and the second switch are both contactors.
Preferably, the method further comprises:
n filter capacitors;
the n filter capacitors are in one-to-one correspondence with the n converters, one end of each filter capacitor is connected with the low-voltage side of each converter and the positive electrode of the electric energy storage medium, and the other end of each filter capacitor is connected with the direct-current negative end of the direct-current bus and the negative electrode of the electric energy storage medium.
Preferably, the communication module is an optical fiber communication module.
Preferably, the method further comprises:
a four-quadrant rectifier;
the first ends of the four-quadrant rectifiers are connected with the direct current buses, n second ends of the four-quadrant rectifiers are respectively connected with the high-voltage sides of n converters, and the four-quadrant rectifiers are used for rectifying.
Preferably, the converter includes:
m inductors, m first IGBTs and m second IGBTs which are in one-to-one correspondence with the m inductors, wherein m is equal to the number of direct current power supply phases of the power supply system;
the collector electrodes of the first IGBT are respectively connected with the direct current positive end of the direct current bus and the collector electrodes of the other first IGBTs;
the emitter of the second IGBT is respectively connected with the direct-current negative terminal of the direct-current bus, the negative electrode of the electric energy storage medium and the emitters of other second IGBTs;
one end of the inductor is connected with the emitter of the first IGBT and the collector of the second IGBT respectively, the other end of the inductor is connected with the other ends of the other inductors respectively, and the connected common end is connected with the positive electrode of the electric energy storage medium corresponding to the converter.
Preferably, the converter further includes:
a first capacitor and a second capacitor;
one end of the first capacitor is respectively connected with the direct current positive end of the direct current bus and the collectors of the m first IGBTs, and the other end of the first capacitor is respectively connected with the direct current negative end of the direct current bus, the negative electrode of the electric energy storage medium and the emitters of the m second IGBTs;
one end of the second capacitor is connected with the positive electrode of the electric energy storage medium and the other ends of the m inductors respectively, and the other ends of the second capacitor are connected with the negative electrode of the electric energy storage medium, the direct-current negative end of the direct-current bus and the emitting electrodes of the m second IGBTs respectively.
The application also discloses a power supply system comprising a power supply system body and n electric energy storage media, and further comprising the multi-converter system;
the multiple converter system is connected with the power supply system body and the n electric energy storage media respectively.
The utility model provides a multi-converter system and electrical power generating system, through setting up n converters and n communication module according to predetermineeing the order to sort, n converters are connected with n electric energy storage medium one-to-one in the electrical power generating system, the high-pressure side of converter is connected with the direct current busbar in the electrical power generating system, the low-pressure side of converter is connected with the power supply end of the electric energy storage medium that the converter corresponds itself, interconnect between the communication module that any two adjacent converters correspond, communication module is used for sending the carrier synchronization signal of the converter that corresponds itself to adjacent communication module, and send the carrier synchronization signal of other converters that receive to the converter that corresponds of communication module itself, the converter is used for charging and discharging the direct current busbar, and adjust the carrier phase shift angle of converter itself according to carrier synchronization signal. When the power supply system is applied to different scenes, the requirement of the power supply system in the different scenes is met by changing the n value, the carrier frequency of the converter is sent to other converters in a mode of mutual connection of the converters, so that the converter can refer to the other converters to adjust the carrier phase shift angle of the converter, the carrier phase shift angle of each converter is the same, the current ripple is guaranteed to be at a lower level, and the reliability of the power supply system is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multiple converter system provided herein;
fig. 2 is a schematic structural diagram of a converter provided in the present application;
FIG. 3 is a schematic diagram of another multiple converter system provided herein;
FIG. 4 is a topology of a converter provided herein;
fig. 5 is a schematic structural diagram of a controller provided in the present application.
Detailed Description
The core of the utility model is to provide a multi-converter system and a power supply system, which can lead the carrier wave phase shift angle of each converter to be the same, ensure that the current ripple is at a lower level, and further ensure the reliability of the power supply system.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The power supply system refers to a system or a device capable of supplying power to other equipment, usually, one end of the power supply system is connected with a mains supply or a power grid, and the other end of the power supply system is connected with other equipment. Based on this, considering that the voltage of the utility power or the power grid fluctuates due to electromagnetic interference or other electric equipment in the power grid, so that the voltage entering the power supply system fluctuates, in order to smooth the fluctuation inside the power supply system to ensure stable power supply to the equipment, some electric energy storage media 2, such as batteries, supercapacitors and other media, are usually arranged in the power supply system. When the voltage of the power grid is too high, the electric energy storage media 2 are charged to achieve the purpose of absorbing the too high voltage current; when the grid voltage is too low, the electrical energy storage medium 2 discharges to complement its voltage. In order to further increase the supply reliability of the power supply system, a converter 1 is usually arranged between the electrical energy storage medium 2 and the dc bus 4. However, due to the rated current limitation of the inverter 1, if the power supply reliability of a power supply system with a large power needs to be improved by the inverter 1, it is generally necessary to provide a plurality of inverters 1.
The carrier phase shift means that the converter 1 adopts N triangular waves with the same amplitude and frequency to be continuously arranged up and down along the vertical axis as carriers, and obtains output levels at different moments after the triangular waves are subjected to cross comparison with the same modulated wave, and the purpose of outputting stable voltage to the electric energy storage medium 2 or the direct current bus 4 by the converter 1 is realized based on the carrier phase shift. However, since the carrier phase shift angles of the different converters 1 are different, although the carrier phase shift angles of the converters 1 can be adjusted by manually observing them in advance, the carrier phase shift angles may be similar or even identical in a short period of time, but the carrier phase shift angles may be gradually different after a long period of time. When the carrier phase shift angles of different converters 1 in the same power supply system are different, current ripple of the power supply system is increased, so that the reliability of the power supply system is affected.
In order to solve the above-mentioned technical problems, please refer to fig. 1, fig. 1 is a schematic structural diagram of a multi-converter system provided in the present application, which includes:
n converters 1 ordered according to a preset sequence, wherein n is an integer not less than 2;
n communication modules 3 connected to the converters 1 in one-to-one correspondence;
the n converters 1 are connected with n electric energy storage media 2 in the power supply system in a one-to-one correspondence manner, the high-voltage side of the converter 1 is connected with a direct current bus 4 in the power supply system, and the low-voltage side of the converter 1 is connected with the power supply end of the electric energy storage media 2 corresponding to the converter 1;
the communication modules 3 corresponding to any two adjacent converters 1 are connected with each other;
the communication module 3 is configured to send the carrier synchronization signal of the corresponding transducer 1 to the adjacent communication module 3, and send the received carrier synchronization signal of the other transducer 1 to the transducer 1 corresponding to the communication module 3;
the converter 1 is used for charging the electric energy storage medium 2 and discharging the direct current bus 4, and the carrier phase shift angle of the converter 1 is adjusted according to the carrier synchronization signal.
Considering that the power required by the power supply system in different application scenes is different, for the power supply system with larger maximum power, when the power supply system is applied to the application scene with smaller required power, in order to save the cost on the premise of ensuring the power supply stability, a part of the electric energy storage media 2 can be put into use according to the actual required power, namely n are put into use, and n is a positive integer and is not more than the total number of the electric energy storage media 2 in the power supply system; for the actually arranged converters 1, the actually arranged number can also be n, and each electric energy storage medium 2 which is put into use is correspondingly connected with one converter 1, and of course, the converters 1 can also be connected with the electric energy storage medium 2 which is not put into use; each converter 1 is responsible for charging the electrical energy storage medium 2 connected to itself when the voltage at the dc bus 4 is too high; and when the voltage is too low, the electrical energy storage medium 2 discharges to complement its voltage. In order to further improve the power supply reliability of the power supply system, in consideration of the problem that carrier phase shift angles are different when a plurality of converters 1 are put into use, the converters 1 can be mutually connected, so that the converters 1 can adjust the carrier phase shift angles by referring to the carrier phase shift angles of other converters 1, and the purpose of n-phase staggered parallel carrier phase shift synchronization is achieved. Specifically, the same number of communication modules 3 as the number of the converters 1 need to be provided, the communication modules 3 may be provided inside the converters 1, or the converters 1 using the self-communication modules 3 may be provided, please refer to fig. 2, fig. 2 is a schematic structural diagram of one of the converters provided in the application, the communication modules 3 are connected with each other, and the carrier frequencies of the converters 1 are sent to other communication modules 3 through the communication modules 3, so that the other converters 1 acquire the carrier frequencies of the other converters 1 from the communication modules 3, and adjust the carrier phase shift angles of the converters 1 themselves.
In order to improve usability and reduce wiring area, the converters 1 may be sequentially ordered in advance in a certain order, for example, according to the position or number of the electric energy storage medium 2 corresponding to each converter 1, or different numbers may be set to each converter 1 in advance, and according to the mutual distance between the converters 1 in a specific circuit, or the like. After each of the transducers 1 has been ordered, the communication modules 3 of any two adjacent transducers 1 are connected to each other, that is, the 1 st transducer 1 in the order is connected to the 2 nd transducer 1, the 2 nd transducer 1 is connected to the 1 st and 3 rd transducers 1, and so on. Further, in order to determine the carrier phase shift angle as the reference, a certain transducer 1 may be designated as the reference transducer 1, the carrier phase shift angles of other transducers 1 may be adjusted according to the carrier phase shift angle of the reference transducer 1, for example, the 1 st transducer 1 in the above-mentioned order may be designated as the reference transducer 1, the communication module 3 corresponding to the 1 st transducer 1 may transmit the carrier frequency of the 1 st transducer 1 to the 2 nd transducer 1, the carrier phase shift angle of the 1 st transducer 1 may not be adjusted according to the carrier frequency of the 2 nd transducer 1, the 2 nd transducer 1 may adjust the carrier phase shift angle according to the carrier frequency of the 1 st transducer 1, the 3 rd transducer 1 may be adjusted according to the 2 nd transducer 1, and so on, which is equivalent to that the source targets of the reference transducer 1 and the reference are all the reference transducers 1 with each other except for the reference transducer 1. Based on this, carrier synchronization between all the transducers 1 can be achieved by referencing carrier frequencies to each other and adjusting carrier phase shift angles of the transducers 1.
According to the number of the converters 1, the number of the carrier phase shifting phases is flexibly configured by changing the internal parameters, and the rated power and the rated current of corresponding grades are selected to apply different occasions, for example, in a rail transit subway traction power supply system, the electric energy storage medium 2 is subjected to charge and discharge control, so that the functions of peak regulation, valley regulation, energy conservation and consumption reduction are realized.
In summary, n converters 1 and n communication modules 3 are arranged and sequenced according to a preset sequence, n converters 1 are connected with n electric energy storage media 2 in a power supply system in a one-to-one correspondence manner, the high voltage side of each converter 1 is connected with a direct current bus 4 in the power supply system, the low voltage side of each converter 1 is connected with a power supply end of the corresponding electric energy storage media 2 of each converter 1, any two adjacent converters 1 are connected with each other corresponding to the communication module 3, the communication modules 3 are used for sending carrier synchronous signals of the corresponding converters 1 to the adjacent communication modules 3, and sending received carrier synchronous signals of other converters 1 to the corresponding converters 1 of the communication modules 3, and the converters 1 are used for charging the electric energy storage media 2, discharging the direct current buses 4 and adjusting carrier phase shifting angles of the converters 1 according to the carrier synchronous signals. When the power supply system is applied to different scenes, the requirement of the power supply system in the different scenes is met by changing the n value, the carrier frequency of the converter 1 is sent to other converters 1 in a mode of mutual connection of the converters 1, so that the converters 1 can refer to the other converters 1 to adjust the carrier phase shift angle of the converters 1, the carrier phase shift angle of each converter 1 is the same, the current ripple is guaranteed to be at a lower level, and the reliability of the power supply system is guaranteed.
Based on the above embodiments:
as a preferred embodiment, further comprising:
n first switches KM1 and n second switches KM2;
the n first switches KM1 and the n second switches KM2 are in one-to-one correspondence with the n converters 1;
the first switch KM1 is arranged between the high-voltage side of the converter 1 corresponding to the first switch KM1 and the direct current bus 4;
the second switch KM2 is arranged between the low-voltage side of the converter 1 corresponding to the second switch KM2 and the electrical energy storage medium 2;
the first switch KM1 and the second switch KM2 are each configured to be opened when the electrical energy storage medium 2 is charged and discharged, and to be closed when the electrical energy storage medium 2 is not charged and discharged.
In order to further improve the stability of the power supply system for supplying power to the device, in this application, please refer to fig. 3, fig. 3 is a schematic structural diagram of another multi-converter system provided in this application, and a switch is further disposed on both sides of each converter 1, where the switch is only closed when the voltage of the dc bus 4 is too high and the electric energy storage medium 2 needs to be charged, and is closed when the voltage of the dc bus 4 is too low and the electric energy storage medium 2 needs to be discharged to the dc bus 4, that is, the first switch KM1 and the second switch KM2 are only closed when the power supply of the power supply system fluctuates; when the power supply does not fluctuate, that is, the electric energy storage medium 2 is neither charged nor discharged, both the first switch KM1 and the second switch KM2 are disconnected, and one switch is arranged on each of two sides, so that the situation that the switch cannot be disconnected in time possibly caused by the fact that the switch is stuck and the like possibly occurs after the service time is prolonged is considered, and the plurality of switches are arranged. After the two switches are disconnected, the connection between the direct current bus 4 and the electric energy storage medium 2 is disconnected, so that the electric energy storage medium 2 cannot influence the voltage amplitude at the direct current bus 4, the power supply of the power supply system under normal conditions is ensured not to be influenced by the power supply system, and the power supply stability of the power supply system to equipment is improved.
As a preferred embodiment, further comprising:
n switch controllers corresponding to the n converters 1 one by one;
one end of a switch controller is connected with the high-voltage side of the converter 1, the other end of the switch controller is connected with the low-voltage side of the converter 1, the control end of the switch controller is respectively connected with the control end of the first switch KM1 and the control end of the second switch KM2, and the switch controller is used for controlling the first switch KM1 and the second switch KM2 to be opened when the electric energy storage medium 2 is charged and discharged and closed when the electric energy storage medium 2 is not charged and discharged according to the voltage at the position of the converter 1.
In order to accurately control the switches, in this application, the first switch KM1 and the second switch KM2 need to be controlled by a switch controller. Specifically, since the on or off state of the first switch KM1 is determined according to the charge-discharge state of the electrical energy storage medium 2, and the state thereof is subject to short-term transformation due to short-term voltage fluctuation or interference, for example, when the power supply system is just powered on, the power supply system does not have stable input current voltage at the moment of just powering on, but rapidly rises until stable in a short time after powering on, and thus a short period of low current voltage exists in the process, and during this period, the first switch KM1 and the second switch KM2 may be mistakenly considered to be closed when the electrical energy storage medium 2 needs to be discharged. Therefore, in order to accurately control the two switches, a switch controller needs to be used for control, specifically, a condition that voltage fluctuation possibly occurs during normal operation is set in the switch controller but normal operation is not affected, and when the condition occurs in actual operation, the current states of the first switch KM1 and the second switch KM2 are kept unchanged. Based on this, by providing the switch controller, the first switch KM1 and the second switch KM2 can be accurately controlled.
As a preferred embodiment, further comprising:
a four-quadrant rectifier;
the first end of the four-quadrant rectifier is connected with the direct current bus 4, the n second ends of the four-quadrant rectifier are respectively connected with the high-voltage sides of the n converters 1, and the four-quadrant rectifier is used for rectifying.
In order to improve the usability of the converter 1, in the application, a four-quadrant rectifier is further provided, and the four-quadrant rectifier can be used for converting alternating current input into a power supply system by a power grid into direct current, or converting direct current transmitted by the electric energy storage medium 2 through the converter 1 into alternating current, for example, the four-quadrant rectifier is used for converting 380V of alternating current input into the power supply system by a three-phase power grid into 540V of direct current, and then the electric energy is stored in the electric energy storage medium 2 through the converter 1 to finish an energy storage process; when the voltage in the direct current bus 4 decreases, the electric energy storage medium 2 discharges and is sent to the four-quadrant rectifier through the converter 1, and the four-quadrant rectifier converts the direct current 540V into the alternating current 380V and sends the alternating current to the direct current bus 4. So that the power supply system supplies power to the device. Because the four-quadrant rectifier has the characteristics of bidirectional energy flow, large power factor and higher reliability, the available direct current can be effectively provided for the subsequent converter 1, and therefore the usability of the converter 1 is improved.
As a preferred embodiment, the first switch KM1 and the second switch KM2 are both contactors.
The contactor can bear large power compared with other switches, has better conductivity and heat resistance, and is suitable for being applied to power supply systems with larger power requirements. And the contactor has long service life, low failure rate and high reliability, and can effectively ensure the stability of a power supply system.
As a preferred embodiment, further comprising:
n filter capacitors C1;
the n filter capacitors C1 are in one-to-one correspondence with the n converters 1, one end of each filter capacitor C1 is connected with the low-voltage side of each converter 1 and the positive electrode of the electric energy storage medium 2, and the other end of each filter capacitor C1 is connected with the direct-current negative end of the direct-current bus 4 and the negative electrode of the electric energy storage medium 2.
In order to ensure the charging stability of the electric energy storage medium 2, in the present application, the process may cause voltage fluctuation due to interference or fluctuation when the converter 1 outputs voltage to the electric energy storage medium 2, and secondly, the amplitude fluctuation of the voltage output by the converter 1 itself becomes more obvious due to the fact that the power demand of the power supply system is generally higher. Therefore, referring to fig. 3, fig. 3 is a schematic structural diagram of another multi-converter system provided in the present application, a capacitor is further disposed between the electric energy storage media 2 and connected in parallel, and ripple waves in the output voltage of the converter 1 are filtered through the capacitor, so that stability and safety of charging the electric energy storage media 2 are ensured.
As a preferred embodiment, the communication module 3 is a fiber optic communication module 3.
The optical fiber has good conductivity, large transmission information capacity, strong anti-interference capability and low conduction loss, and can be used for transmitting the carrier frequency to other communication modules 3 without damage when transmitting the carrier frequency, so that the situation that the carrier frequency is transformed due to overlong distance or electromagnetic interference in the transmission process can be avoided, and the optical fiber can be used as the communication module 3 well.
As a preferred embodiment, the converter 1 comprises:
m inductors, m first IGBTs and m second IGBTs which are in one-to-one correspondence with the m inductors, wherein m is equal to the number of direct current power supply phases of the power supply system;
the collector electrodes of the first IGBTs are respectively connected with the direct current positive end of the direct current bus 4 and the collector electrodes of other first IGBTs;
the emitter of the second IGBT is respectively connected with the direct-current negative end of the direct-current bus 4, the negative electrode of the electric energy storage medium 2 and the emitters of other second IGBTs;
one end of the inductor is connected with the emitter of the first IGBT and the collector of the second IGBT respectively, the other end of the inductor is connected with the other ends of other inductors respectively, and the connected common end is connected with the positive electrode of the electric energy storage medium 2 corresponding to the converter 1.
Considering that the application scenarios of the power supply system are different, the number of the power supply phases of the power supply system will also change, for example, the power supply system may be applied in the application scenario of a single-phase power grid or the application scenario of a three-phase power grid, so that the structure of the actual converter 1 needs to be adjusted according to the actual application scenario. Referring to fig. 4, fig. 4 is a topology diagram of a converter provided in the present application, where a first IGBT, a second IGBT and an inductor provided in a converter 1 are divided into m groups according to an actual number of power supply phases, where the first IGBT in the same group is used as an upper bridge arm, the second IGBT is used as a lower bridge arm, the converter 1 uses a control method of carrier phase shifting in m phase-shifting in staggered parallel, and fig. 4 describes a converter topology when m is equal to 3, and the converter topology is formed by a three-phase half-bridge driving control circuit formed by 6 IGBTs, a bus filter capacitor Cdc, inductors/reactors L1, L2 and L3, and a low-voltage side filter capacitor Cb, and when m is 2, 1 group of bridge arms can be deleted, that is, an IGBTs5 and an IGBTs6 are deleted, and when m is 1, and 2 groups are deleted. For example, when the power supply system is applied to a three-phase power scene, according to the system working mode, the high-frequency PWM signals of 3 IGBTs of an upper bridge arm (Buck mode) or a lower bridge arm (Boost mode) are sequentially delayed by 120 degrees in phase according to the system working mode, namely, the switching tubes S1, S3, S5 or S2, S4 and S6 are alternately conducted 120, in this way, compared with the switching frequency of charging and discharging which is realized by only arranging three converters 1, the amplitude of current ripple is three times as high as that of the last three, the current stress of the IGBTs can be effectively reduced, and the output power of the power supply system can be effectively improved. Furthermore, since the power supply system is generally applied in a scene of large power, by providing an inductance as a reactance unit at each power supply phase number of the power supply system, the current can be effectively blocked to achieve the purpose of protecting the electric energy storage medium 2.
In addition, the main body of the converter 1 further includes a controller, a power supply board, a signal acquisition board, a driving board, and the like. The power panel provides electric energy for the chip and peripheral circuit of the converter 1, the controller controls other various elements in the converter 1 to work, please refer to fig. 5, fig. 5 is a schematic structural diagram of a controller provided in the present application, the controller is a DSP (Digital Signal Processing ) controller, including a keyboard, an AD module, a DA module, an external input/output module, a protection module and an expansion module, and the above-mentioned communication module 3 may also be disposed in the controller. The keyboard provides an operation mode for staff, the AD and DA modules are responsible for converting signal quantity, referring to FIG. 4, the data collected by the AD module mainly comprises the current of three-phase bridge arms L1, L2 and L3, the high-voltage side voltage Udc and the low-voltage side voltage Ub, and the communication module 3 CAN also comprise a CAN (Controller Area Network ) communication circuit, an RS485 communication circuit, an Ethernet communication circuit, a SCI (Serial Communication Interface ) circuit and the like besides the optical fiber communication module 3; the protection module is used for overcurrent detection; the power supply circuit provides power for other circuits and elements; the external input/output circuit and the expansion module are mainly used for facilitating the access of staff to other devices to realize other functions.
As a preferred embodiment, the converter 1 further comprises:
a first capacitor Cdc and a second capacitor Cb;
one end of the first capacitor Cdc is respectively connected with the direct current positive end of the direct current bus 4 and the collectors of the m first IGBTs, and the other end of the first capacitor Cdc is respectively connected with the direct current negative end of the direct current bus 4, the negative electrode of the electric energy storage medium 2 and the emitters of the m second IGBTs;
one end of the second capacitor Cb is connected to the positive electrode of the electric energy storage medium 2 and the other ends of the m inductors, respectively, and the other ends of the second capacitor Cb are connected to the negative electrode of the electric energy storage medium 2, the direct current negative terminal of the direct current bus 4, and the emitters of the m second IGBTs, respectively.
In order to further stabilize the voltage, in the present application, a capacitor is provided on both the high-voltage side and the low-voltage side of the converter 1, and the voltage input to the converter 1 by the dc bus 4 and the voltage input to the converter 1 by the electrical energy storage medium 2 are further filtered by the first capacitor Cdc and the second capacitor Cb.
The application also provides a power supply system comprising a power supply system body and n electric energy storage media, and further comprising the multi-converter system;
the multi-converter system is connected to the power system body and the n electrical energy storage media, respectively.
For a detailed description of a power supply system provided in the present application, please refer to the above-mentioned embodiments of the multiple converter system, and the detailed description is omitted herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the power supply system disclosed in the embodiment, since it corresponds to the multi-converter system disclosed in the embodiment, the description is relatively simple, and the relevant points are referred to in the multi-converter system part.
It should also be noted that in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, article or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present utility model. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A multiple converter system, comprising:
n converters ordered according to a preset sequence, wherein n is an integer not less than 2;
n communication modules connected with the converters in a one-to-one correspondence manner;
the n converters are connected with n electric energy storage media in the power supply system in a one-to-one correspondence manner, the high-voltage side of each converter is connected with a direct current bus in the power supply system, and the low-voltage side of each converter is connected with the power supply end of the corresponding electric energy storage medium of each converter;
the communication modules corresponding to any two adjacent converters are connected with each other;
the communication module is used for sending the carrier synchronization signals of the corresponding converters to the adjacent communication modules and sending the received carrier synchronization signals of other converters to the corresponding converters of the communication module;
the converter is used for charging the electric energy storage medium and discharging the direct current bus, and adjusting the carrier phase shift angle of the converter according to the carrier synchronization signal.
2. The multiple conversion system of claim 1, further comprising:
n first switches and n second switches;
the n first switches and the n second switches are in one-to-one correspondence with the n converters;
the first switch is arranged between the high-voltage side of the converter corresponding to the first switch and the direct-current bus;
the second switch is arranged between the low-voltage side of the converter corresponding to the second switch and the electric energy storage medium;
the first switch and the second switch are each configured to open when the electrical energy storage medium is charged and discharged and to close when the electrical energy storage medium is not charged and discharged.
3. The multiple conversion system of claim 2, further comprising:
n switch controllers corresponding to the n converters one by one;
one end of the switch controller is connected with the high-voltage side of the converter, the other end of the switch controller is connected with the low-voltage side of the converter, the control ends of the switch controller are respectively connected with the control ends of the first switch and the second switch, and the switch controller is used for controlling the first switch and the second switch to be opened when the electric energy storage medium is charged and discharged and closed when the electric energy storage medium is not charged and discharged according to the voltage at the converter.
4. The multiple converter system of claim 2, wherein the first switch and the second switch are each contactors.
5. The multiple conversion system of claim 1, further comprising:
n filter capacitors;
the n filter capacitors are in one-to-one correspondence with the n converters, one end of each filter capacitor is connected with the low-voltage side of each converter and the positive electrode of the electric energy storage medium, and the other end of each filter capacitor is connected with the direct-current negative end of the direct-current bus and the negative electrode of the electric energy storage medium.
6. The multiple conversion system of claim 1, wherein the communication module is a fiber optic communication module.
7. The multiple conversion system of claim 1, further comprising:
a four-quadrant rectifier;
the first ends of the four-quadrant rectifiers are connected with the direct current buses, n second ends of the four-quadrant rectifiers are respectively connected with the high-voltage sides of n converters, and the four-quadrant rectifiers are used for rectifying.
8. The multiple converter system of any of claims 1-7, wherein the converter comprises:
m inductors, m first IGBTs and m second IGBTs which are in one-to-one correspondence with the m inductors, wherein m is equal to the number of direct current power supply phases of the power supply system;
the collector electrodes of the first IGBT are respectively connected with the direct current positive end of the direct current bus and the collector electrodes of the other first IGBTs;
the emitter of the second IGBT is respectively connected with the direct-current negative terminal of the direct-current bus, the negative electrode of the electric energy storage medium and the emitters of other second IGBTs;
one end of the inductor is connected with the emitter of the first IGBT and the collector of the second IGBT respectively, the other end of the inductor is connected with the other ends of the other inductors respectively, and the connected common end is connected with the positive electrode of the electric energy storage medium corresponding to the converter.
9. The multiple conversion system of claim 8, wherein the converter further comprises:
a first capacitor and a second capacitor;
one end of the first capacitor is respectively connected with the direct current positive end of the direct current bus and the collectors of the m first IGBTs, and the other end of the first capacitor is respectively connected with the direct current negative end of the direct current bus, the negative electrode of the electric energy storage medium and the emitters of the m second IGBTs;
one end of the second capacitor is connected with the positive electrode of the electric energy storage medium and the other ends of the m inductors respectively, and the other ends of the second capacitor are connected with the negative electrode of the electric energy storage medium, the direct-current negative end of the direct-current bus and the emitting electrodes of the m second IGBTs respectively.
10. A power supply system comprising a power supply system body and n electrical energy storage media, further comprising a multi-converter system according to any one of claims 1 to 9;
the multiple converter system is connected with the power supply system body and the n electric energy storage media respectively.
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| CN202320160993.3U CN219372300U (en) | 2023-02-06 | 2023-02-06 | Multi-converter system and power supply system |
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| CN202320160993.3U CN219372300U (en) | 2023-02-06 | 2023-02-06 | Multi-converter system and power supply system |
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