CN105048502A - Control method for parallel power generation system - Google Patents
Control method for parallel power generation system Download PDFInfo
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- CN105048502A CN105048502A CN201510493157.7A CN201510493157A CN105048502A CN 105048502 A CN105048502 A CN 105048502A CN 201510493157 A CN201510493157 A CN 201510493157A CN 105048502 A CN105048502 A CN 105048502A
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Abstract
The invention provides a control method for a parallel power generation system. Each module of the parallel power generation system uploads output current to a communication bus; meanwhile, output current values of other modules are received through the communication bus; the system average current is calculated by each module according to the output current collected by various modules on the bus; the system average current and the output current of the modules are subjected to difference operation and are adjusted by a current-equalizing adjuster; with an output value of the current-equalizing adjuster as correcting current, the correcting current and the output value of a voltage adjuster are subjected to addition as a set value of the output current; and through the action of the current-equalizing adjuster and a current regulator, the system average current is tracked by the output current of various modules in real time, thereby realizing current equalization.
Description
Technical field
The present invention relates to a kind of control method of parallel power generating system.
Background technology
Along with the development of technology, the power of electric supply system is increasing, and in the face of current stress, thermal stress and the problem such as device for power switching selecting expensive high power level, traditional single power supply can not meet the demands.For meeting the requirement of the reliability of electrical system, efficiency and power density, usually adopt the mode of multiple electricity generation system parallel connection generating.Parallel power generating system is generally made up of the wired in parallel that multiple configuration is identical, each module is formed by power circuit and control circuit, power circuit is main circuit again, for transmitting the power of dynamical system, control circuit is for controlling main circuit, each module only combines in load place, sends identical voltage.
In parallel power generating system, usually consider two aspect problems, one is for ensureing system reliability, adopts redundancy structure, and another is the electric current distribution of each module.Due to parallel module characteristic each in parallel power generating system with difficult parameters with consistent, blocks current can be caused uneven, during heavy load, the module that output current is large may work in heavy condition for a long time, cause module failure rate to improve, therefore in parallel connection generating, need to take measures to ensure modules synchronous operation, system stability is reliably worked, gives full play to the advantage of parallel system.
The control mode of current parallel power generating system is generally divided into centerized fusion, master & slave control and without interconnecting signal line separate control solution, as shown in Figure 1, centerized fusion is with independently Centralized Controller J01, all module J 04, J05 receives the synchronous pwm signal J02 that Centralized Controller sends, J03, but pass through cable transmission between the pwm signal that sends of Centralized Controller and modules, poor reliability, Centralized Controller is once fault, there is paralysis in system, redundancy feature cannot be had, the length of transmission cable affects the synchronous of pwm signal on the other hand, so each module is difficult to really realize current-sharing.Compare with centralized control, master-slave control method has certain advantage, it does not have Centralized Controller, master-slave control method is formed by some wired in parallel, and select one wherein as primary module, all the other follow primary module work as from module, so from module by respective control channel, make all modules share same load current.But master-slave control method also has some shortcomings: primary module is once break down, and whole system will be paralysed, and is unsuitable for redundant parallel system.
Compare with first two control mode, the control connection line in parallel system between each module is not needed without interconnecting signal line independence control mode, each module independent operating, by the current-sharing of dividing equally realization of load active power, reactive power, but due to the existence of line impedance, reactive power will can not get well dividing equally, so current-sharing effect is subject to certain restrictions, and this mode implementation procedure is complicated, or take very high cpu resource.
Summary of the invention
The object of the invention is to overcome prior art poor reliability, system cannot the shortcoming of redundancy, proposes a kind of control method for parallel power generating system newly.The each module of the present invention has independently control channel, on the basis of conventional voltage outer shroud, current inner loop two close cycles, without the need to increasing hardware detecting circuit, also without the need to the algorithm of complexity, only after outer voltage, add an equal throttle regulator, by the process of equal throttle regulator, obtain good current-sharing effect, make system have redundancy feature.
Described double-closed-loop control can control final output voltage, can control maximum output current again.Voltage loop, electric current loop adopt pi regulator respectively.In Voltage loop, given output voltage reference value, poor with the output voltage of actual acquisition, and after voltage regulator, its output valve is as output current set-point; In like manner, the output current of output current set-point and collection is poor, and after current regulator, output pwm signal, for driving main circuit.So through double-closed-loop control, output voltage reference value given in output voltage last floating voltage ring, output current follows the tracks of output current set-point.
The present invention is based on conventional voltage outer shroud, current inner loop double-closed-loop control, after outer voltage, with the addition of equal throttle regulator.Apply parallel power generating system of the present invention, do not have the differentiation of principal and subordinate's module, each module has independently control channel, thus avoids principal and subordinate's module and switch the problem brought.Each control channel comprises voltage regulator, all throttle regulator, current regulator, PWM generator, sampling module and signal processing module.In control channel, the transmission direction of signal is: given output voltage reference value in voltage regulators, the output voltage of given output voltage reference value and actual acquisition is made difference and is managed through voltage regulator by voltage regulator, the correcting current that output valve and the equal throttle regulator of voltage regulator export is added, together as output current set-point, current regulator is by poor for the output current of output current set-point and collection, and last output pwm signal, for driving main circuit.
In parallel power generating system, what each module uploaded self outputs current to communication bus, received the output current of other modules self by communication bus simultaneously, each module is according to self output current computing system average current of module each on communication bus, the output current of system average current and module self is poor, through the adjustment of equal throttle regulator, using the output valve of equal throttle regulator as correcting current.This correcting current is added as output current set-point with the output valve of voltage regulator.During normal work, the output valve of voltage regulator is a constant, only has and carrys out regulation output given value of current value by correcting current, and output current set-point just can be made equal with system average current.Through equal throttle regulator and current regulator, each module output current real-time tracking system average current, thus each module realizes current-sharing automatically.When wherein certain module breaks down, malfunctioning module closed communication, exits parallel system automatically, and other modules also no longer receive this malfunctioning module output current value.Accordingly, all the other modules are when calculating average current, also the output current value of this malfunctioning module can be rejected, again new system average current is obtained, so do not affect the operation of other modules when one of them module breaks down, thus improve reliability of operation, make system have redundancy feature.
Control method of the present invention is as follows:
Self output current value gathered is delivered to communication bus by each module in parallel system, and accepts the output current value of other modules on communication bus, averages to self output current summation of all modules simultaneously
for system average current, I
1, I
2for each module output current, N is the total number of modules of parallel system.In equal throttle regulator, system average current
with each module output current I
1or I
2differ from, export after equal throttle regulator, as correcting current.Correcting current is added as output current set-point with voltage regulator output valve.The output current set-point of all modules is all made up of correcting current and voltage regulator output valve two parts.When the output current of module is equal with system average current, correcting current is zero; When the output current of a certain module is greater than system average current, correcting current is negative value, this module output current set-point reduces, again by the adjustment of current inner loop, this module output current is made to follow the tracks of output current set-point, finally under the effect of equal throttle regulator and current regulator, this module output current equals system average current.When the output current of a certain module is less than system average current, output calibration electric current be on the occasion of, this module output current set-point increases, again by the adjustment of current inner loop, this module output current is made to follow the tracks of output current set-point, finally under the effect of equal throttle regulator and current regulator, this module output current equals system average current.
During normal work, the output valve of voltage regulator is a constant, only has and carrys out regulation output given value of current value by correcting current.The output current of each module compares when having deviation with system average current, by equal throttle regulator output calibration electric current, thus regulation output given value of current value, make output current set-point equal system average current.Last again by the effect of current regulator, make the output current of each module equal with output current set-point, each module maintains simultaneous operation.When a certain module breaks down, the communication of this module is closed immediately, automatically exits parallel system, can not the normal work of influential system.Other modules also no longer receive malfunctioning module output current value.Accordingly, other each modules are when computing system average current, also the output current value of malfunctioning module can be rejected, again new system average current is obtained, each module is by the effect of equal throttle regulator and current regulator, again follow the tracks of new system average current, finally realize current-sharing and export, achieve the redundancy feature of parallel power generating system.
Compared with prior art, each module all has independently control channel, and the generating of each module is consistent with sharing control mode, control algolithm is simple, does not have principal and subordinate to distinguish, each module output current equals system average current, can realize the Synchronization Control of each module, sharing control is easy to realize, and control precision and stability are all better, and not by the impact of parallel module number, capacity extension is flexible.In addition when one of them module breaks down, do not affect the operation of other modules, improve the reliability of system.
Accompanying drawing explanation
Fig. 1 is existing centerized fusion mode schematic diagram;
Fig. 2 is application parallel power generating system operational system figure of the present invention;
Fig. 3 is control mode flow chart of the present invention.
In figure: J01 Centralized Controller, J02, synchronizing signal in J03 centerized fusion mode, J04, module in J05 centerized fusion mode, 101, 102, 103, 104 modules 1, module 2, module 3, module 4, the voltage regulator of 105 modules 1, the voltage regulator of 106 modules 2, the voltage regulator of 107 modules 3, 108 module 4 voltage regulators, the equal throttle regulator of 109 modules 1, the equal throttle regulator of 110 modules 2, the equal throttle regulator of 111 modules 3, the equal throttle regulator of 112 modules 4, the current regulator of 113 modules 1, the current regulator of 114 modules 2, the current regulator of 115 modules 3, the current regulator of 116 modules 4, the PWM generator of 117 modules 1, the PWM generator of 118 modules 2, the PWM generator of 119 modules 3, the PWM generator of 120 modules 4, the signal processing module of 121 modules 1, the signal processing module of 122 modules 2, the signal processing module of 123 modules 3, the signal processing module of 124 modules 4, the sampling module of 125 modules 1, the sampling module of 126 modules 2, the sampling module of 127 modules 3, the sampling module of 128 modules 4,129 module 1 main circuits, 130 module 2 main circuits, 131 module 3 main circuits, 132 module 4 main circuits, 133 module 1 control channels, 134 module 2 control channels, 135 module 3 control channels, 136 module 4 control channels, 137 communication buses, 138 parallel power generating systems.
Embodiment
The present invention is further illustrated below in conjunction with the drawings and specific embodiments.
For the control method of DC/DC parallel power generating system, concrete rate-determining steps of the present invention is described below.
Fig. 2 is application parallel power generating system of the present invention.As shown in Figure 2, this parallel power generating system 138 is composed in parallel by four modules 101,102,103 and 104, connected by communication bus 137 between each module, each module comprises independently control channel, each control channel is based on outer voltage, the double-closed-loop control method of current inner loop, with the addition of equal throttle regulator on this basis, and equal throttle regulator is as the inner ring of Voltage loop.The output valve of equal throttle regulator is correcting current, and output current set-point is made up of output valve two parts of correcting current and voltage regulator.During normal work, the output valve of voltage regulator is a constant, only has by correcting current regulation output given value of current value.
In parallel power generating system, each module realizes current-sharing automatically by equal throttle regulator and current regulator, and each module independently controls, and does not have principal and subordinate to distinguish, so the generating of each module is identical with current-sharing control method.As shown in Figure 3, as follows to the rate-determining steps of parallel power generating system:
Step S01, module 101,102,103,104 given output voltage reference values are all U
dc *, module 101,102,103,104 gathers the output voltage U of self by respective sampling module 125,126,127,128 simultaneously
1, U
2, U
3, U
4with output current I
1, I
2, I
3, I
4;
Step S02, module 101 uploads the output current I of self by signal processing module 121
1to communication bus 137, receive by communication bus 137 the output current value I that all the other modules 102,103,104 upload simultaneously
2, I
3, I
4, and all module output current value summations are averaged, obtain system average current
i
1, I
2, I
3, I
4be respectively the output current of module 101,102,103,104.
Meanwhile, module 102,103,104 is also respectively by self output current I that respective signal processing module 122,123,124 will gather
2, I
3, I
4be uploaded to communication bus 137, and receive the output current value of all the other modules by communication bus 137, all module output current value summations are averaged, obtains system average current
Step S03, module 1 control channel 133 comprises voltage regulator 105, all throttle regulator 109, current regulator 113, PWM generator 117, signal processing module 121 and sampling module 125.The voltage regulator 105 adoption rate integral element of module 1, the equal throttle regulator 109 adoption rate link of module 1, output voltage reference value U in module 1 voltage regulator 105
dc *with output voltage U
1make difference and obtain voltage regulator output valve through voltage regulator 105 process.In the equal throttle regulator 109 of module 1, system average current
with output current I
1differ from, output calibration electric current after equal throttle regulator 109 regulates, correcting current is added as output current set-point with voltage regulator output valve.In like manner, also same process is carried out in module 2 control channel 134, module 3 control channel 135, module 4 control channel 136, in module 2 control channel 134, the voltage regulator 106 adoption rate integral element of module 2, the equal throttle regulator 110 adoption rate link of module 2, output voltage reference value U
dc *with output voltage U
2do the process of the poor voltage regulator 106 through module 2 and obtain voltage regulator output valve.System average current
with output current I
2differ from, output calibration electric current after the equal throttle regulator 110 of module 2 regulates, correcting current is added as output current set-point with voltage regulator output valve, in module 3 control channel 135, the voltage regulator 107 adoption rate integral element of module 3, the equal throttle regulator 111 adoption rate link of module 3, output voltage reference value U
dc *with output voltage U
3do the process of the poor voltage regulator 107 through module 3 and obtain voltage regulator output valve.System average current
with output current I
3differ from, output calibration electric current after the equal throttle regulator 111 of module 3 regulates, correcting current is added as output current set-point with voltage regulator output valve, in module 4 control channel 136, the voltage regulator 108 adoption rate integral element of module 4, the equal throttle regulator 112 adoption rate link of module 4, output voltage reference value U
dc *with output voltage U
4do the process of the poor voltage regulator 108 through module 4 and obtain voltage regulator output valve.System average current
with output current I
4differ from, output calibration electric current after the equal throttle regulator 112 of module 4 regulates, correcting current is added as output current set-point with voltage regulator output valve.
The output current set-point of all modules is all made up of correcting current and voltage regulator output valve two parts.Each module realizes current-sharing automatically by equal throttle regulator.When the output current of module is equal with system average current, correcting current is zero; When the output current of a certain module is greater than system average current, output calibration electric current is negative value, and the output current set-point of this module reduces; When the output current of a certain module is less than system average current, output calibration electric current is increase on the occasion of the output current set-point of, this module.Each module, by current-sharing controller action, ensures identical output current set-point.
Step S04, the current regulator 115 of the current regulator 113 of module 1, the current regulator 114 of module 2, module 3, the current regulator 116 adoption rate integral element of module 4, each module has identical output current set-point, all equals system average current.Module 101, after the current regulator 113 of module 1 regulates, exports the PWM generator 117 of module 1 to, last output pwm signal, driver module 1 main circuit 129, output current tracking system average current.In like manner, module 102 regulates through the current regulator 114 of module 2, export the PWM generator 118 of module 2 to, last output pwm signal, driver module 2 main circuit 130, output current tracking system average current, module 103 regulates through the current regulator 115 of module 3, export the PWM generator 119 of module 3 to, last output pwm signal, driver module 3 main circuit 131, output current tracking system average current, module 104 regulates through the current regulator 116 of module 4, export the PWM generator 120 of module 4 to, last output pwm signal, driver module 4 main circuit 132, output current tracking system average current.
Step S05, step S06, step S07, judge have module whether to break down, when each module normally works, and system average current
with the current signal I gathered
1differ from, output calibration electric current after equal throttle regulator, correcting current is added as output current set-point with voltage regulator output valve, and correcting current compensates each module output current set-point, finally by current regulator, with system average current
for target, realize current-sharing by equal throttle regulator, module output current equals system average current
each module realizes synchronism output.
When there being module to break down, such as module 101 breaks down, module 101 closed communications, and module 102,103,104 rejects the output current value I of malfunctioning module 101
1, recalculate system average current new in system
each module, by current-sharing controller action, follows the tracks of new system average current again
each module maintains simultaneous operation, again realizes current-sharing and exports, achieve the redundancy feature of parallel power generating system, ensure that the reliability of system.
Step S08, by equal throttle regulator, each module output current equals system average current
finally export synchronous pwm signal, system realizes current-sharing.
Present system is based on double-closed-loop control, so the number of module all has good dynamic response characteristic, the each module of native system has independently control channel, there is no the difference of centralized control and principal and subordinate's module, be easy to form redundant system, after avoiding primary module fault, system paralyses state.By adding equal throttle regulator after voltage regulator, make output current tracking system average current, achieve output current automatic uniform and distribute, though system has interconnecting signal line, but control algolithm is simple.
Native system parallel module number can unlimited extension, and each intermodule achieves uniform current and distributes, and prevents individual module from operating in current limitation state of value.In addition when one of them module breaks down, malfunctioning module can log off fast, does not affect the operation of all the other modules, so also just do not affect the normal operation of whole system, improves the reliability of system cloud gray model.
Claims (4)
1. a control method for parallel power generating system, is characterized in that: what each module of parallel power generating system uploaded self outputs current to communication bus, is received the output current value of other modules self by communication bus simultaneously; Each module according to the output current computing system average current of module acquires each in bus, by system average current and module output current poor, regulate through equal throttle regulator, using the output valve of equal throttle regulator as correcting current; Correcting current is added as output current set-point with voltage regulator output valve, and by the effect of equal throttle regulator and current regulator, the output current real-time tracking system average current of each module, realizes current-sharing.
2. according to the control method of parallel power generating system according to claim 1, it is characterized in that: when the output current of a certain module of described parallel power generating system is equal with described system average current, correcting current is zero; When the output current of a certain module of parallel power generating system is greater than system average current, correcting current is negative value, this module output current set-point is reduced, again by the adjustment of current inner loop, this module output current is made to follow the tracks of output current set-point, finally under the effect of equal throttle regulator and current regulator, this module output current equals system average current; When the output current of a certain module of parallel power generating system is less than system average current, output calibration electric current be on the occasion of, this module output current set-point is increased, again by the adjustment of current inner loop, this module output current follows the tracks of output current set-point, finally under the effect of equal throttle regulator and current regulator, this module output current equals system average current.
3. the control method of parallel power generating system according to claim 1, it is characterized in that: when a certain module of described parallel power generating system breaks down, this module closed communication, exit parallel system, other modules no longer receive the output current value of malfunctioning module, and accordingly, other each modules are when computing system average current, reject the output current value of malfunctioning module, obtain new system average current; Each module, by the effect of equal throttle regulator and current regulator, follows the tracks of new system average current again, realizes current-sharing and exports.
4. the control method of parallel power generating system according to claim 1, it is characterized in that: described control method is with outer voltage, based on the double-closed-loop control of current inner loop, with the addition of equal throttle regulator after outer voltage, the output of equal throttle regulator is correcting current; During normal work, the output valve of voltage regulator is a constant; By correcting current regulation output given value of current value, make output current set-point equal with system average current.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106452122A (en) * | 2016-09-22 | 2017-02-22 | 许继电气股份有限公司 | Parallel coordinative running control method and control device of AC/DC direct current source |
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| CN101009436A (en) * | 2007-01-24 | 2007-08-01 | 浙江大学 | An improved control method for UPS parallel connection average current |
| CN102447253A (en) * | 2011-12-30 | 2012-05-09 | 洛阳理工学院 | Direct current switching power supply parallel system current sharing control method and control device |
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