Control system, valve base control appliance and submodule integral method
Technical field:
The present invention relates to the power electronics direct current transportation field of electric power system, be specifically related to valve base control appliance, control system and submodule integral method.
Background technology:
Modularization multi-level converter is composed in series by a plurality of submodules, need carry out different real-time switching control to independent submodule according to capacitance voltage and submodule operating state, level number is many more, and control cycle is short more in real time, the difficult more realization of capacitance voltage Balance Control.Because submodule comprises submodule controller, IGBT, protection thyristor and by-pass switch assembly; and traditional direct current transportation valve base electronic device only is an actuator; except valve monitoring and defencive function; do not possess real-time control ability to different submodules; can not satisfy the control protection requirement of modularization flexible DC power transmission valve, so need a kind of equipment to satisfy the requirement of modular multilevel flexible DC power transmission with real-time control defencive function.
Summary of the invention:
At the deficiencies in the prior art, technical problem to be solved by this invention is design a kind of control system, valve base control appliance and the incorporate method of submodule, can finish the real-time control and the defencive function of the flexible straight-wavy valve of modular multilevel.
Control system provided by the invention, valve base control appliance and submodule integral method, described control system comprises control unit, and described submodule (SM) comprises submodule controller (SMC), IGBT, thyristor and by-pass switch, and its improvements are:
Described valve base control appliance comprises the screen cabinet, and described screen cabinet is provided with power supply unit, current control unit and brachium pontis control unit;
Successively the interface of the described submodule controller of the described brachium pontis control unit of the described current control unit of the described control unit of described control system, described valve base control appliance, described valve base control appliance and described submodule is connected with optical fiber.
The incorporate method of first preferred version provided by the invention, its improvements are: respectively at signalization feedback path between described valve base control appliance and the described submodule controller, between described control system and the described valve base control appliance.
The incorporate method of second preferred version provided by the invention, its improvements are: the communication mode of described optical fiber is made as anti-Manchester's code form based on CRC check.
The incorporate method of the 3rd preferred version provided by the invention, its improvements are: adopt current balance type to control described brachium pontis control unit to described current control unit, described brachium pontis control unit adopts the balance of voltage to control described submodule.
The incorporate method of the 4th preferred version provided by the invention, its improvements are: 4 optical fiber are set between described valve base control appliance and the described control system.
The incorporate method of the 5th preferred version provided by the invention, its improvements are: 2 optical fiber are set between described valve base control appliance and the described submodule.
The incorporate method of more preferably scheme provided by the invention, its improvements are: 4 optical fiber are set between described valve base control appliance and the described control system.
The incorporate method of another preferred version provided by the invention, its improvements are: 2 optical fiber are set between described valve base control appliance and the described submodule.
Compared with the prior art, beneficial effect of the present invention is:
Valve base control appliance among the present invention can be finished the real-time control and the defencive function of the flexible straight-wavy valve of modular multilevel as the interface equipment between modular multilevel flexible DC power transmission control protection system and the submodule controller.
The present invention takes current control unit and brachium pontis control unit framework, current control unit has realized that converter electrode current Balance Control, brachium pontis overcurrent protection, real time data gather function, brachium pontis control unit realization valve submodule is controlled defencive function in real time, identical hardware structure is taked in all functions unit, but flexible combination, applicability is strong; Can make that also the capacitance voltage Balance Control division of labor of system-level current balance type control and valve level is clear and definite, deliver to current control unit after making a large amount of valid data of valve level handle simultaneously through the brachium pontis control unit, current control unit screens effectively according to upper strata control system needs feedack again, this Parallel preconditioning adds the mode that data gather can improve arithmetic speed greatly, thereby satisfies the modular multilevel needs of control in real time.
The present invention has increased between control system and the valve base control appliance, the amount of information of simple optical fiber between valve base control appliance and the submodule controller, thus greatly reduce number of fibers.
The present invention adopts the synchronous serial communication based on the anti-Manchester's code mode of CRC check, overcome the shortcoming that traditional pulse code is subject to disturb, data message is few, channel utilization is low, reduce system's control time-delay, improved data throughout and transfer of data real-time and reliability.
Description of drawings
Fig. 1 is a valve base control appliance hardware configuration schematic diagram provided by the invention;
Fig. 2 is control system provided by the invention, valve base control appliance and submodule control unit interface principle schematic;
Fig. 3 is the anti-Manchester's code form schematic diagram based on CRC check provided by the invention;
Fig. 4 is a valve base control appliance internal hardware architecture principle schematic diagram provided by the invention.
Embodiment
The valve base control appliance is the interface equipment of modular multilevel flexible DC power transmission control protection system and converter valve, is mainly used in control, supervision and the protection of finishing valve.When the control protection system issued the control command of valve, the valve base control appliance was just according to this order switching or bypass converter valve.
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Among Fig. 1; the valve base control appliance is taked the hardware structure of current control unit and brachium pontis control unit; become by two sides screen group altogether; A1; B1 is two independently current control units; A2 to A4; B2 to B4 is 6 independently brachium pontis control units; A5; B5 is two independently power supply units; 2 current control units are realized system-level current balance type control; brachium pontis electric current and voltage protection; be responsible for the control protection and the data aggregation process of 6 brachium pontis control units; 6 brachium pontis control units are realized the control of the valve layer balance of voltage, are responsible for the control protection and the data aggregation process of all valve straton modules.
Among Fig. 2, the valve base control appliance respectively with upper strata control system and valve straton module controller (SMC) interface.The valve base control appliance makes full use of and upper strata control system channel resource, carries out data interaction by four optical fiber communications, and data are divided into control command, real-time feedback information, metrical information, incident feedback information four classes.Valve base control appliance and the SMC of lower floor are respectively submodule trigger command and submodule state feedback information by two optical fiber communications.After the valve base control appliance is handled the control command that receives, be converted into the different switching order of each submodule and be handed down to SMC, SMC feeds back to the valve base control appliance with pending processing next time with the real-time status of submodule after receiving valve base control appliance control command.All communication interfaces are the fiber optic serial communication mode based on the anti-Manchester's code form of CRC check.
Among Fig. 3, the anti-Manchester's code form that valve base control appliance, upper strata control system and SMC optical fiber communication are taked based on CRC check, the one frame is made up of initial symbol, 1 to 16 optional 16 bit byte data, CRC check sign indicating number, frame among the figure is with 3 16 bit byte data instances, 3 16 bit byte data representation effective informations, this information both can be data messages, also can be switching value information, in actual the use, can select data length flexibly according to data volume size and traffic rate.
Among Fig. 4, valve base control appliance inside, current control unit is responsible for and upper strata control protection interface, and the brachium pontis control unit is responsible for and valve layer SMC interface.Current control unit is responsible for all brachium pontis control units of coordinate synchronization, and the brachium pontis control unit is responsible for the control protection (for N+1 level topological structure) of N submodule on the brachium pontis.
Current control unit receives the higher level and controls protection system control guarded command; and carry out sending the Voltage Reference order to 6 brachium pontis control units after the current balance type control; trigger command with submodule after the brachium pontis control unit is controlled through the balance of voltage sends to the real-time switching submodule of SMC, realizes the output of N+1 level.
Current control unit and each brachium pontis control unit are only realized data communication by two optical fiber, and all communication interfaces are the optical fiber communication mode based on the anti-Manchester's code form of CRC check.
Should be noted that at last: only illustrate that in conjunction with the foregoing description technical scheme of the present invention is not intended to limit.Those of ordinary skill in the field are to be understood that: those skilled in the art can make amendment or are equal to replacement the specific embodiment of the present invention, but these modifications or change are all among the claim protection range that application is awaited the reply.