CN113193776B - MMC structure based on synchronous handshake protocol and control method - Google Patents
MMC structure based on synchronous handshake protocol and control method Download PDFInfo
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- CN113193776B CN113193776B CN202110604849.XA CN202110604849A CN113193776B CN 113193776 B CN113193776 B CN 113193776B CN 202110604849 A CN202110604849 A CN 202110604849A CN 113193776 B CN113193776 B CN 113193776B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00001—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by the display of information or by user interaction, e.g. supervisory control and data acquisition systems [SCADA] or graphical user interfaces [GUI]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
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- Engineering & Computer Science (AREA)
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention provides an MMC structure and a control method based on a synchronous handshake protocol, comprising the following steps: a centralized control host and an MMC energy conversion sub-module; the centralized control host is used as a master station for control, and comprises: the sampling detection circuit, the RS485 communication circuit and the synchronous signal generation circuit; the MMC energy conversion sub-module is used as a slave station for control, and comprises: the system comprises an MMC full-bridge control circuit, a synchronous signal receiving circuit, an RS485 communication circuit and an output interface. The invention has strong flexibility in structure and control, can adapt to voltages of different grades by changing the cascade quantity of the MMC energy conversion sub-modules, can only disassemble the failed MMC energy conversion sub-modules without affecting the normal operation of the whole power supply system when in failure, and can select different control modes to output different voltage types in terms of output voltage types.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to an MMC structure and a control method based on a synchronous handshake protocol.
Background
Along with the establishment of direct current loads such as electric automobile direct current charging piles, communication facilities and the like, particularly large-scale internet data centers, the demands of people on direct current power supply systems are increasing. The voltage of the direct current side of the existing medium-low voltage direct current distribution system is usually higher and is generally 3-10kV, the direct current side is not suitable for direct connection of direct current loads, the direct current side is usually converted into 380V/220V household electricity and then inverted, the direct current side is suitable for the voltage grade of the direct current loads, and electric energy waste can be caused.
The structure based on the modularized multi-level converter (modular multilevel converter, MMC) can be suitable for the voltage of a medium-low voltage direct current system by changing the number of cascaded MMCs, and meanwhile, the structure can be provided with output ports with multi-level voltage according to the requirement of a load, so that the structure has high flexibility.
Patent document CN104753043a (application number: CN 201510141886.6) discloses a hybrid multilevel converter with dc fault ride through capability, which is based on a dislocation lamination theory and includes a three-phase bridge rectifier circuit, and a working method thereof; each bridge arm of the three-phase bridge rectifier circuit comprises a staggered lamination module, a cascading double sub-module group, a half-bridge sub-module group and a reactor which are mutually cascaded; the discharging process before the converter is blocked when the fault occurs is an oscillating discharging process with known initial conditions, after the fault occurs, the equivalent capacitance value of the bridge arm changes, and if and only if the reverse voltage provided by the bridge arm cascade capacitor in any loop state is always larger than the amplitude of the alternating current line voltage, the short-circuit current is reduced to zero by utilizing the inverse blocking characteristic of the diode, so that the direct current fault is cleared.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an MMC structure and a control method based on a synchronous handshake protocol.
The MMC structure based on the synchronous handshake protocol provided by the invention comprises the following components: a centralized control host and an MMC energy conversion sub-module;
the centralized control host is used as a master station for control, and comprises: the sampling detection circuit, the RS485 communication circuit and the synchronous signal generation circuit;
the MMC energy conversion sub-module is used as a slave station for control, and comprises: the system comprises an MMC full-bridge control circuit, a synchronous signal receiving circuit, an RS485 communication circuit and an output interface;
the sampling detection circuit of the master station is connected with the output port of the slave station;
the RS485 communication circuit of the master station is sequentially connected with the RS485 communication circuit of the slave station;
the synchronous signal generating circuit of the master station is sequentially connected with the synchronous signal receiving circuit of the slave station;
the output port of the slave station is connected with a load;
the input end of the MMC full-bridge control circuit is connected with the voltage division parallel capacitor, and the output end of the MMC full-bridge control circuit is connected with the output port of the slave station or is cascaded with the output end of the MMC full-bridge control circuit of the next-stage MMC energy conversion sub-module.
Preferably, the sampling monitoring circuit samples output voltage and current of the output port, and performs monitoring and fault feedback control.
Preferably, the master station and the slave stations communicate in a handshake mode, and synchronous handshake of the master station to the slave stations is ensured through synchronous signals, and the slave stations handshake to the master station in sequence.
Preferably, the total number of the MMC energy conversion submodules is determined according to the voltage level of the input direct current side, and the output port is determined by the load type and the voltage level thereof.
Preferably, the MMC full-bridge control circuit outputs different voltage levels and types according to different modulation strategies.
Preferably, the centralized control host receives the running state information sent by the slave station, interacts with the cloud network/power grid platform, issues a control instruction to the slave station, and changes the running state of the slave station;
the MMC energy conversion sub-module compares the voltage on the voltage division parallel capacitor connected with the MMC energy conversion sub-module with a set value through monitoring, performs self closed-loop control, and ensures the voltage stability of the voltage division parallel capacitor.
The MMC control method based on the synchronous handshake protocol provided by the invention comprises the following steps:
step 1: determining the cascade quantity of MMC energy conversion sub-modules and the power supply mode of an output port according to the voltage class of the medium-low voltage direct current side and the requirements of the connected system load;
step 2: the control system is electrified, each slave station communicates with the master station in a synchronous handshake mode, and the modulation strategy of each MMC energy conversion sub-module is determined;
step 3: the master station transmits a synchronous signal to each slave station, and the slave stations work under the synchronous signal according to a modulation strategy;
step 4: the master station communicates with the slave stations in a synchronous handshake manner, and the slave stations operate according to master station commands.
Preferably, the secondary station operates in a manner including:
the slave station sends a fault instruction to the master station, and the master station sends the fault instruction and then carries out system alarm;
the slave station sends a normal instruction to the master station, and if the master station does not receive an external instruction issued by the cloud network or the power grid platform, the system continues to operate;
the slave station sends a normal instruction to the master station, and the master station updates the modulation strategy after receiving an external instruction.
Preferably, the synchronous handshake in step 2 is as follows:
step 2.1: the master station inquires an address instruction;
step 2.2: the slave station receives the inquiry address command, the slave station sequentially sends the command to the master station according to the pre-allocated address sequence, and if the slave station does not receive the command, the master station prompts and gives an early warning;
step 2.3: the master station sends a synchronization instruction and a modulation strategy selection instruction again to command each slave station to enter a waiting state;
step 2.4: the slave station sequentially transmits response instructions and enters a waiting state.
Preferably, the synchronous handshake in step 4 is as follows:
step 4.1: the master station simultaneously sends a state inquiry command to each slave station according to the slave station address;
step 4.2: after each slave station receives the command of the master station, if the working state of the slave station is judged to be normal, the response command is not sent to the master station, and if the working state of the slave station is judged to be abnormal, the corresponding command is sent to the master station;
step 4.3: the master station transmits a reception instruction completion instruction to the slave station.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention can directly cascade the medium-low voltage direct-current side voltage through the multi-layer MMC energy conversion submodule and directly connect with the direct-current load; meanwhile, the invention adopts a modularized structure, has high flexibility and is easy and convenient to operate;
(2) The invention can be applicable to the voltage of a medium-low voltage direct current system by changing the number of cascaded MMCs, and can also be provided with output ports with multi-level voltage according to the requirements of loads so as to directly supply power to the loads;
(3) The invention can be suitable for the voltage of a medium-low voltage direct current system by changing the number of the cascade MMCs, and meanwhile, the invention can be provided with output ports with multi-level voltage according to the requirement of a load, and has high flexibility.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is a block diagram of the MMC architecture and control of the present invention;
fig. 2 is a control flow diagram illustration of the present invention.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present invention.
Examples:
the MMC structure based on the synchronous handshake protocol comprises a centralized control host and an MMC energy conversion sub-module; the centralized control host is used as a master station for control and comprises a sampling detection circuit, an RS485 communication circuit and a synchronous signal generation circuit; the MMC energy conversion sub-module is used as a slave station for control, and comprises an MMC full-bridge control circuit, a synchronous signal receiving circuit, an RS485 communication circuit and an output interface. Wherein:
the master station sampling detection circuit is connected with an output port of the slave station. The sampling monitoring circuit samples the output voltage and current of the output port and performs monitoring and fault feedback control.
The master station RS485 communication circuit is sequentially connected with the slave station RS485 communication circuit; the communication mode is a handshake mode, and the synchronous signal ensures that the master station performs handshake on the slave stations simultaneously, and the slave stations perform handshake on the master station sequentially.
The master station synchronizing signal generating circuit is sequentially connected with the slave station synchronizing signal receiving circuit. And through the synchronous signals, the coordination automatic control of all the slave stations is ensured.
The total number of MMC energy conversion submodules is determined according to the voltage level of the input direct current side, and the output port is determined by the load type and the voltage level of the load type.
The input end of the MMC full-bridge control circuit is connected with the voltage division parallel capacitor, and the output end of the MMC full-bridge control circuit is connected with the output port or is cascaded with the output end of the MMC full-bridge control circuit of the next-stage MMC energy conversion submodule. The MMC full-bridge control circuit can output different voltage levels and types through different modulation strategies.
The slave station synchronizing signal receiving circuit is connected with the master station synchronizing signal generating circuit.
The output port is connected with a load.
The centralized control host can receive the running state information sent by the secondary station, can interact with the cloud network/power grid platform, gives a control instruction to the secondary station, and changes the running state of the secondary station.
The MMC energy conversion sub-module is used for comparing the voltage on the voltage division parallel capacitor connected with the MMC energy conversion sub-module with a set value through monitoring, and performing closed-loop control of the MMC energy conversion sub-module to ensure voltage stability of the voltage division parallel capacitor.
Referring to fig. 1, the mmc energy conversion sub-module is a detachable module, and can be operated after cascade connection or independently according to the output voltage level requirement. The power supply system can be disassembled when in failure without affecting the normal operation of the whole power supply system, and in terms of output voltage types, different control modes can be selected to output different voltage types, and the communication adopts a synchronous handshake mode to improve the safety and reliability of the communication when the system operates.
The specific implementation steps are as shown in fig. 2:
s1: determining the cascade quantity of MMC energy conversion sub-modules and the power supply mode of an output port according to the voltage class of the medium-low voltage direct current side and the requirements of the connected system load;
s2: the control system is electrified, each slave station communicates with the master station in a synchronous handshake mode, and the modulation strategy of each MMC energy conversion sub-module is determined;
s3: the master station transmits a synchronizing signal to each slave station, and the slave stations work under the synchronizing signal according to the modulation strategy;
s4: the master station and the slave stations communicate according to a synchronous handshake mode, and the slave stations work according to a master station command;
s5: according to different instructions of the master station, the slave station has the following 3 working modes:
s5.1: the slave station sends a fault instruction to the master station, the master station sends the fault instruction, and the system alarms;
s5.2: the slave station sends a normal instruction to the master station, the master station does not receive an external instruction issued by the cloud network or the power grid platform, and the system continues to operate;
s5.3: the slave station sends a normal instruction to the master station, the master station receives an external instruction, and the slave station updates a modulation strategy;
s6: and returning to S4.
The synchronous handshake method involved in the step S2 is as follows:
s2.1: master station inquiry address instruction
S2.2: the slave station receives the inquiry address command, and the slave station sequentially sends the command to the master station according to the pre-allocated address sequence; if a certain slave station does not receive the instruction, the master station prompts and gives an early warning;
s2.3: the master station sends a synchronization instruction and a modulation strategy selection instruction again to command each slave station to enter a waiting state;
s2.4: the slave station sequentially transmits response instructions and enters a waiting state.
The synchronous handshake method involved in the step S4 is as follows:
s4.1: the master station simultaneously transmits a state inquiry command to each slave station according to the slave station address;
s4.2: after each slave station receives the command of the master station, if the slave station works normally, the response command does not need to be sent to the master station, and if the slave station works abnormally, the corresponding command needs to be sent to the master station;
s4.3: the master station transmits a reception instruction completion instruction to the slave station.
In the description of the present application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, merely to facilitate description of the present application and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and are not to be construed as limiting the present application.
Those skilled in the art will appreciate that the systems, apparatus, and their respective modules provided herein may be implemented entirely by logic programming of method steps such that the systems, apparatus, and their respective modules are implemented as logic gates, switches, application specific integrated circuits, programmable logic controllers, embedded microcontrollers, etc., in addition to the systems, apparatus, and their respective modules being implemented as pure computer readable program code. Therefore, the system, the apparatus, and the respective modules thereof provided by the present invention may be regarded as one hardware component, and the modules included therein for implementing various programs may also be regarded as structures within the hardware component; modules for implementing various functions may also be regarded as being either software programs for implementing the methods or structures within hardware components.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily without conflict.
Claims (1)
1. The MMC control method based on the synchronous handshake protocol is characterized by adopting an MMC structure based on the synchronous handshake protocol for control, wherein the MMC structure based on the synchronous handshake protocol comprises the following steps: a centralized control host and an MMC energy conversion sub-module;
the centralized control host is used as a master station for control, and comprises: the sampling detection circuit, the RS485 communication circuit and the synchronous signal generation circuit;
the MMC energy conversion sub-module is used as a slave station for control, and comprises: the system comprises an MMC full-bridge control circuit, a synchronous signal receiving circuit, an RS485 communication circuit and an output interface;
the sampling detection circuit of the master station is connected with the output port of the slave station;
the RS485 communication circuit of the master station is sequentially connected with the RS485 communication circuit of the slave station;
the synchronous signal generating circuit of the master station is sequentially connected with the synchronous signal receiving circuit of the slave station;
the output port of the slave station is connected with a load;
the input end of the MMC full-bridge control circuit is connected with the voltage division parallel capacitor, and the output end of the MMC full-bridge control circuit is connected with the output port of the slave station or is cascaded with the output end of the MMC full-bridge control circuit of the next-stage MMC energy conversion sub-module;
the sampling monitoring circuit samples output voltage and current of the output port and performs monitoring and fault feedback control;
the master station and the slave stations communicate in a handshake mode, the synchronous handshake of the master station to the slave stations is ensured through synchronous signals, and the slave stations handshake with the master station in sequence;
the total number of the MMC energy conversion submodules is determined according to the voltage level of the input direct current side, and the output port is determined by the load type and the voltage level of the load type;
the MMC full-bridge control circuit outputs different voltage classes and types according to different modulation strategies;
the centralized control host receives running state information sent by the slave station, interacts with the cloud network/power grid platform, issues a control instruction to the slave station, and changes the running condition of the slave station;
the MMC energy conversion sub-module compares the voltage on the voltage division parallel capacitor connected with the MMC energy conversion sub-module with a set value through monitoring the voltage, and performs self closed-loop control to ensure the voltage stability of the voltage division parallel capacitor;
the MMC control method based on the synchronous handshake protocol comprises the following steps:
step 1: determining the cascade quantity of MMC energy conversion sub-modules and the power supply mode of an output port according to the voltage class of the medium-low voltage direct current side and the requirements of the connected system load;
step 2: the control system is electrified, each slave station communicates with the master station in a synchronous handshake mode, and the modulation strategy of each MMC energy conversion sub-module is determined;
step 3: the master station transmits a synchronous signal to each slave station, and the slave stations work under the synchronous signal according to a modulation strategy;
step 4: the master station and the slave stations communicate according to a synchronous handshake mode, and the slave stations work according to a master station command;
the working mode of the slave station comprises the following steps:
the slave station sends a fault instruction to the master station, and the master station sends the fault instruction and then carries out system alarm;
the slave station sends a normal instruction to the master station, and if the master station does not receive an external instruction issued by the cloud network or the power grid platform, the system continues to operate;
the slave station sends a normal instruction to the master station, and the master station updates the modulation strategy after receiving an external instruction;
the synchronous handshake in the step 2 is as follows:
step 2.1: the master station inquires an address instruction;
step 2.2: the slave station receives the inquiry address command, the slave station sequentially sends the command to the master station according to the pre-allocated address sequence, and if the slave station does not receive the command, the master station prompts and gives an early warning;
step 2.3: the master station sends a synchronization instruction and a modulation strategy selection instruction again to command each slave station to enter a waiting state;
step 2.4: the slave station sequentially sends response instructions and enters a waiting state;
the synchronous handshake in the step 4 is as follows:
step 4.1: the master station simultaneously sends a state inquiry command to each slave station according to the slave station address;
step 4.2: after each slave station receives the command of the master station, if the working state of the slave station is judged to be normal, the response command is not sent to the master station, and if the working state of the slave station is judged to be abnormal, the corresponding command is sent to the master station;
step 4.3: the master station transmits a reception instruction completion instruction to the slave station.
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| CN212863673U (en) * | 2020-07-29 | 2021-04-02 | 杭州安比达电气有限公司 | Monitoring system of elevator MMC controller |
| CN112600440B (en) * | 2020-12-17 | 2022-08-12 | 清华大学 | Converter topology circuit |
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