CN104505858A - Modularized grid-connected inverter and double-voltage-loop control method thereof - Google Patents
Modularized grid-connected inverter and double-voltage-loop control method thereof Download PDFInfo
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- CN104505858A CN104505858A CN201410827376.XA CN201410827376A CN104505858A CN 104505858 A CN104505858 A CN 104505858A CN 201410827376 A CN201410827376 A CN 201410827376A CN 104505858 A CN104505858 A CN 104505858A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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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
- H02M7/493—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 the static converters being arranged for operation in parallel
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Abstract
The invention relates to a modularized grid-connected inverter and a double-voltage-loop control method thereof. The method includes: a central controller generates a system grid-connected current given value through a system voltage control loop according to a direct-current bus voltage sampling value and a direct-current bus voltage given value and transmits the direct-current bus voltage given value and the system grid-connected current given value to each grid-connected inverter module through a communication bus, each grid-connected inverter module generates a module grid-connected current given value through a module voltage control loop according to a module direct-current bus voltage sampling value and the direct-current bus voltage given value transmitted by the central controller and combines the system grid-connected current given value transmitted by the central controller to generate the final grid-connected current given value. By the method, good steady-state performance of the modularized grid-connected inverter is kept, system dynamic performance is improved, adverse effects of the communication bus on the system dynamic performance is reduced, and direct-current bus voltage fluctuation is reduced greatly when system input power changes fiercely.
Description
Technical field
The present invention relates to power electronic technology, in particular, relate to a kind of modularization combining inverter and twin voltage ring control method thereof.
Background technology
Combining inverter is widely used in the fields such as generation of electricity by new energy.For grid-connected inverter system, efficiency is high, and good reliability is important measurement index.Modularization combining inverter all can realize efficient conversion at wide loading range, and one of them module failure does not affect the operation of complete machine, has good reliability, and is easy to safeguard.Fig. 1 is a kind of system construction drawing of modularization combining inverter.This inverter comprises a central controller and N number of combining inverter module.The input side of all modules is DC bus, and outlet side is AC network.Central controller realizes information interchange by the module controller of communication bus and modules inside.
For modularization combining inverter, mainly contain two kinds of control programs in currently available technology: a kind of control program using one of them module as primary module, busbar voltage control ring is realized by primary module, export the given value of current value for generation of grid-connected current control ring, primary module sends the output valve of busbar voltage control ring to other from module by communication bus simultaneously.Only perform grid-connected current control ring from module and produce the given value of current value of the grid-connected current control ring identical with primary module according to the output valve of primary module transmission.Program primary module with unequal from module status, once primary module fault can affect the stable operation of whole system; Another kind of control program median generatrix voltage control loop is performed by central controller, and sends the output of busbar voltage control ring to all module.Modules only performs single grid-connected current control ring, and the given value of current value of grid-connected current control ring produces according to the output valve of the busbar voltage control ring received.The status that this control program achieves modules is impartial, the operation of the equal not influential system of any one module failure.But the control performance of the speed meeting influential system of communication bus transmission, when power fluctuation, the fluctuation of busbar voltage is larger.
Summary of the invention
The technical problem to be solved in the present invention is, for the defect of the above-mentioned existing control program of modularization combining inverter, there is provided a kind of be applicable to modularization combining inverter to realize modules status impartial, reduce the dysgenic control method that communication speed produces system.
The technical solution adopted for the present invention to solve the technical problems is: adopt a kind of twin voltage ring control method being applicable to modularization combining inverter, this modularization combining inverter comprises central controller and several combining inverter modules, described central controller obtains DC bus-bar voltage and AC network information, controlled and monitor the operation of all combining inverter modules by communication bus, described combining inverter module realizes being incorporated into the power networks, to electrical grid transmission electric energy, this twin voltage ring control method comprises:
S101. central controller produces system grid connection given value of current value according to DC bus-bar voltage sampled value and DC bus-bar voltage set-point by system voltage control ring, and sends DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus;
S102. the DC bus-bar voltage set-point that combining inverter module transmits according to module DC bus-bar voltage sampled value and central controller passes through module voltage control ring generation module grid-connected current set-point, and in conjunction with the system grid connection given value of current value that central controller transmits, produce final grid-connected current set-point.
In the twin voltage ring control method of modularization combining inverter of the present invention, in described step S101, the mode of passing ratio integration, the poor of DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value.
In the twin voltage ring control method of modularization combining inverter of the present invention, described step S102 comprises:
S1021. the mode of passing ratio or proportional integral, the DC bus-bar voltage set-point transmitted according to central controller and the poor generation module grid-connected current set-point of module DC bus-bar voltage sampled value;
S1022. the system grid connection given value of current value that module grid-connected current set-point and central controller transmit is added and obtains final grid-connected current set-point.
In the twin voltage ring control method of modularization combining inverter of the present invention, described final grid-connected current set-point is directly or by the set-point as latter stage grid current regulator after process, for controlling the amplitude size of grid-connected current, regulate grid-connected power, realize the stable of DC bus-bar voltage.
The present invention also constructs a kind of modularization combining inverter, this modularization combining inverter comprises central controller, module controller and control section, connected by communication bus between described central controller and described module controller, transmitting control information and running state information, described control section comprises:
System voltage control ring unit, realized by central controller, difference for the DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value, and sends DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus;
Module voltage control ring unit, is realized by module controller, for the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of the DC bus-bar voltage set-point that transmits according to central controller and module;
The given generation unit of grid-connected current, is realized by module controller, produces final grid-connected current set-point for the system grid connection given value of current value transmitted according to module grid-connected current set-point and central controller;
In modularization combining inverter of the present invention, described system voltage control ring unit comprises:
First adder, for generation of the difference of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and central controller;
First pi controller, for passing ratio integral way, the poor of DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value.
In modularization combining inverter of the present invention, described module voltage control ring unit comprises:
Second adder, for generation of the difference of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Second proportional controller, for passing ratio mode, according to the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module.
In modularization combining inverter of the present invention, described module voltage control ring unit comprises:
Second adder, for generation of the difference of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Second proportional controller, for passing ratio mode, according to the ratio output of the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Second integral controller, for by integral way, according to the integration output before the decay of the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Integration output pad, the integration output that decay produces the module grid-connected current set-point after decay is carried out for the integration output before being decayed by module grid-connected current set-point, before no matter decaying be on the occasion of or negative value, through after a while, all decay to 0;
3rd adder, for according to the ratio output of module grid-connected current set-point and integration output generation module grid-connected current set-point.
In modularization combining inverter of the present invention, the given generation unit of described grid-connected current is made up of the 4th adder, the system grid connection given value of current value that module grid-connected current set-point and central controller transmit is added and produces final grid-connected current set-point.
Implement technical scheme of the present invention, central controller is according to the difference of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and central controller, system grid connection given value of current value can be obtained by the control of system voltage control ring, and send system grid connection given value of current value and DC bus-bar voltage set-point to each combining inverter module by communication bus, the difference of the DC bus-bar voltage sampled value of the DC bus-bar voltage set-point that combining inverter module transmits according to central controller and combining inverter module, module grid-connected current set-point can be obtained by the control of module voltage control ring, system grid connection given value of current value module grid-connected current set-point and central controller transmitted superposes and can obtain final grid-connected current set-point, by the given value of current value of process as post-module grid-connected current control ring, according to obtained grid-connected current set-point and module grid-connected current sampled value, control signal can be obtained by the control of module grid-connected current control ring, this control signal generates the switching tube of suitable trigger impulse control inverter by trigger impulse generation unit, realize the control of grid-connected current.
Advantage of the present invention is: there is the system voltage control ring of central controller and the module voltage control ring of combining inverter module, two-line voltage synthesis ring cooperatively interacts, ensure the runnability of systematic steady state, improve the dynamic control performance of system, reduce the harmful effect of communication bus to system control performance, when power acute variation, greatly reduce the fluctuation of DC bus-bar voltage.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the system construction drawing of modularization combining inverter of the present invention;
Fig. 2 is the flow chart of the twin voltage ring control method embodiment of modularization combining inverter of the present invention;
Fig. 3 is the flow chart of step S102 preferred embodiment in Fig. 2;
Fig. 4 is the logic diagram of the control section embodiment of modularization combining inverter of the present invention;
Fig. 5 is the control block diagram of the control section embodiment one of modularization combining inverter of the present invention;
Fig. 6 is the control block diagram of the control section embodiment two of modularization combining inverter of the present invention;
Embodiment
The present invention is further illustrated below in conjunction with accompanying drawing.
What first illustrate is, modularization combining inverter comprises central controller, module controller and control section, connected by communication bus between described central controller and described module controller, transmitting control information and running state information, in described control section, central controller produces system grid connection given value of current value according to DC bus-bar voltage sampled value and DC bus-bar voltage set-point by system voltage control ring, and send described DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus, the DC bus-bar voltage set-point that combining inverter module transmits according to module DC bus-bar voltage sampled value and central controller passes through module voltage control ring generation module grid-connected current set-point, and in conjunction with the system grid connection given value of current value that central controller transmits, produce final grid-connected current set-point, described system voltage control ring and module voltage control ring cooperatively interact, realize twin voltage ring to control, maintain the steady-state behaviour that modularization combining inverter is good, and improve the dynamic property of system, reduce communication bus to the harmful effect of dynamic performance, when making system input power acute variation, the voltage fluctuation of DC bus significantly reduces.
As shown in Figure 2, in the flow chart of the twin voltage ring control method embodiment of modularization combining inverter of the present invention, this twin voltage ring control method comprises:
S101. central controller produces system grid connection given value of current value according to DC bus-bar voltage sampled value and DC bus-bar voltage set-point by system voltage control ring, and sends DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus;
S102. the DC bus-bar voltage set-point that combining inverter module transmits according to module DC bus-bar voltage sampled value and central controller passes through module voltage control ring generation module grid-connected current set-point, and in conjunction with the system grid connection given value of current value that central controller transmits, produce final grid-connected current set-point.
Preferably, in the step S101 of this embodiment, the mode of passing ratio integration, the poor of DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value, and sends DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus.
Preferably, as shown in Figure 3, the step S102 of this embodiment can comprise the following steps:
S1021. the mode of passing ratio or proportional integral, the DC bus-bar voltage set-point transmitted according to central controller and the poor generation module grid-connected current set-point of module DC bus-bar voltage sampled value;
S1022. the system grid connection given value of current value that module grid-connected current set-point and central controller transmit is added and obtains final grid-connected current set-point.
In the twin voltage ring control method of modularization combining inverter of the present invention, described final grid-connected current set-point is directly or by the set-point as latter stage grid current regulator after process, for controlling the amplitude size of grid-connected current, regulate grid-connected power, realize the stable of DC bus-bar voltage.
Should be noted that, be more than embodiments of the invention, this embodiment is only for explaining the present invention, be not intended to limit the present invention, as, have a lot according to the DC bus-bar voltage sampled value of central controller and the mode of DC bus-bar voltage set-point generation system grid connection given value of current value, the present invention not merely limits the mode that above-described embodiment provides.In addition, interactive information between central controller and each combining inverter module, can have various ways, and the present invention not merely limits the mode of the employing communication bus that above-described embodiment provides.
Fig. 4 is the logic diagram of the control section embodiment of modularization combining inverter of the present invention, and this control section comprises:
System voltage control ring unit 100, realized by central controller, difference for the DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value, and sends DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus;
Module voltage control ring unit 200, is realized by module controller, for the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of the DC bus-bar voltage set-point that transmits according to central controller and module;
The given generation unit 300 of grid-connected current, is realized by module controller, produces final grid-connected current set-point for the system grid connection given value of current value transmitted according to module grid-connected current set-point and central controller;
Preferably, the control block diagram of the control section embodiment one of the modularization combining inverter of the present invention shown in Fig. 5, this control section comprises the system voltage control ring unit 100 of central controller, the module voltage control ring unit 200 of module controller and the given generation unit 300 of grid-connected current, wherein, system voltage control ring unit 100 comprises first adder 111 and the first pi controller 112, module voltage control ring unit 200 comprises second adder 211 and the second proportional controller 212, the given generation unit 300 of grid-connected current comprises the 4th adder 311, in this control section:
First adder 111, for generation of DC bus-bar voltage set-point v
busrefwith the DC bus-bar voltage sampled value v of central controller
bus_cdifference;
First pi controller 112, for passing ratio integral way, according to DC bus-bar voltage set-point v
busrefwith the DC bus-bar voltage sampled value v of central controller
bus_cdifference produce system grid connection given value of current value i
ref_s.
Second adder 211, for generation of DC bus-bar voltage set-point v
busrefwith the DC bus-bar voltage sampled value v of module
bus_mdifference;
Second proportional controller 212, for passing ratio mode, according to DC bus-bar voltage set-point v
busrefwith the DC bus-bar voltage sampled value v of module
bus_mpoor generation module grid-connected current set-point i
ref_m;
4th adder 311, for by module grid-connected current set-point i
ref_mwith the system grid connection given value of current value i that central controller transmits
ref_sbe added and produce final grid-connected current set-point i
ref.
The control block diagram of the control section embodiment two of the modularization combining inverter of the present invention shown in Fig. 6, this control section comprises the system voltage control ring unit 100 of central controller, the module voltage control ring unit 200 of module controller and the given generation unit 300 of grid-connected current, wherein, system voltage control ring unit 100 comprises first adder 111 and the first pi controller 112, module voltage control ring unit 200 comprises second adder 211, second proportional controller 212, second integral controller 213, integration output pad 214 and the 3rd adder 215, the given generation unit 300 of grid-connected current comprises the 4th adder 311.Should be noted that, first adder 111 in this embodiment, first pi controller 112, second adder 211 and the 4th adder 311 respectively with the first adder 111 in the embodiment shown in Fig. 5, first pi controller 112, second adder 211 is identical with the logical construction of the 4th adder 311, does not repeat them here, and below different parts is only described:
Second proportional controller 212, for passing ratio mode, according to DC bus-bar voltage set-point v
busrefwith the DC bus-bar voltage sampled value v of module
bus_mthe ratio output i of poor generation module grid-connected current set-point
pref;
Second integral controller 213, for by integral way, according to DC bus-bar voltage set-point v
busrefwith the DC bus-bar voltage sampled value v of module
bus_mthe decay of poor generation module grid-connected current set-point before integration output i
iref_b;
Integration output pad 214, for by module grid-connected current set-point decay before integration output i
iref_bcarry out decaying and produce the integration output i of the module grid-connected current set-point after decaying
iref, no matter decay front i
iref_bbe on the occasion of or negative value, through after a while, i
irefall decay to 0;
3rd adder 215, for the ratio output i by module grid-connected current set-point
prefwith the integration output i after the decay of module grid-connected current set-point
irefbe added generation module grid-connected current set-point i
ref_m.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improves, all should be included within right of the present invention.
Claims (9)
1. a modularization combining inverter, this modularization combining inverter comprises central controller, module controller and control section, connected by communication bus between described central controller and described module controller, transmitting control information and running state information, is characterized in that: described control section comprises:
System voltage control ring unit, realized by central controller, difference for the DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value, and sends DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus;
Module voltage control ring unit, is realized by module controller, for the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of the DC bus-bar voltage set-point that transmits according to central controller and module;
The given generation unit of grid-connected current, is realized by module controller, produces final grid-connected current set-point for the system grid connection given value of current value transmitted according to module grid-connected current set-point and central controller.
2. modularization combining inverter according to claim 1, is characterized in that: described system voltage control ring unit comprises:
First adder, for generation of the difference of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and central controller;
First pi controller, for passing ratio integral way, the poor of DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value.
3. modularization combining inverter according to claim 1, is characterized in that: described module voltage control ring unit comprises:
Second adder, for generation of the difference of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Second proportional controller, for passing ratio mode, according to the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module.
4. modularization combining inverter according to claim 1, is characterized in that, described module voltage control ring unit comprises:
Second adder, for generation of the difference of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Second proportional controller, for passing ratio mode, according to the ratio output of the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Second integral controller, for by integral way, according to the integration output before the decay of the poor generation module grid-connected current set-point of the DC bus-bar voltage sampled value of DC bus-bar voltage set-point and module;
Integration output pad, the integration output that decay produces the module grid-connected current set-point after decay is carried out for the integration output before being decayed by module grid-connected current set-point, before no matter decaying be on the occasion of or negative value, through after a while, all decay to 0;
3rd adder, for according to the ratio output of module grid-connected current set-point and integration output generation module grid-connected current set-point.
5. modularization combining inverter according to claim 1, it is characterized in that: the given generation unit of described grid-connected current is made up of the 4th adder, the system grid connection given value of current value that module grid-connected current set-point and central controller transmit is added and produces final grid-connected current set-point.
6. the twin voltage ring control method of a kind of modularization combining inverter as claimed in claim 1, comprises the steps:
S101. central controller produces system grid connection given value of current value according to DC bus-bar voltage sampled value and DC bus-bar voltage set-point by system voltage control ring, and sends DC bus-bar voltage set-point and system grid connection given value of current value to each combining inverter module by communication bus;
S102. the DC bus-bar voltage set-point that combining inverter module transmits according to module DC bus-bar voltage sampled value and central controller passes through module voltage control ring generation module grid-connected current set-point, and in conjunction with the system grid connection given value of current value that central controller transmits, produce final grid-connected current set-point.
7. twin voltage ring control method according to claim 6, it is characterized in that: in described step S101, the mode of passing ratio integration, the poor of DC bus-bar voltage sampled value according to DC bus-bar voltage set-point and central controller produces system grid connection given value of current value.
8. twin voltage ring control method according to claim 6, it is characterized in that, described step S102 comprises:
S1021. the mode of passing ratio or proportional integral, the DC bus-bar voltage set-point transmitted according to central controller and the poor generation module grid-connected current set-point of module DC bus-bar voltage sampled value;
S1022. the system grid connection given value of current value that module grid-connected current set-point and central controller transmit is added and obtains final grid-connected current set-point.
9. twin voltage ring control method according to claim 1, it is characterized in that: the final grid-connected current set-point described in S102 is directly or by the set-point as latter stage grid current regulator after process, for controlling the amplitude size of grid-connected current, regulate grid-connected power, realize the stable of DC bus-bar voltage.
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Application publication date: 20150408 |