CN105790285A - SVG control method and SVG control system - Google Patents
SVG control method and SVG control system Download PDFInfo
- Publication number
- CN105790285A CN105790285A CN201610271806.3A CN201610271806A CN105790285A CN 105790285 A CN105790285 A CN 105790285A CN 201610271806 A CN201610271806 A CN 201610271806A CN 105790285 A CN105790285 A CN 105790285A
- Authority
- CN
- China
- Prior art keywords
- phase
- control
- result
- module
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Control Of Electrical Variables (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
The invention discloses an SVG control method and an SVG control system. The SVG comprises a control system and 3N cascade modules. Each phase of a power supply is connected with N cascade modules. The SVG control method comprises the steps of acquiring DC voltage of each cascade module and performing first PI controlling on the DC voltage, thereby obtaining a corrected phase angle which corresponds with each cascade module; obtaining the single-phase average DC voltage of the 3N cascade modules and performing second PI controlling on the single-phase average DC voltage, thereby obtaining a modulation wave amplitude of the control system; calculating the reactive power of the control system and performing third PI controlling on the reactive power of the control system, thereby obtaining the phase shifting angle of the control system; obtaining the three-phase voltage of the SVG and performing phase-locked control on the three-phase voltage of the SVG, thereby obtaining the synchronous phase of the control system; and obtaining 3N modulation wave signals which correspond with the cascade modules according to the modulation wave amplitude, the phase shifting angle, the synchronous phase and the corrected phase angle which corresponds with each cascade module, thereby obtaining 3N driving signals which are used for driving and controlling corresponding cascade modules. According to the SVG control method and the SVG control system, a PI driving mode is utilized, thereby realizing simple algorithm design and high control stability.
Description
Technical field
The present invention relates to reactive power compensation technology field, particularly relate to a kind of SVG control method and system.
Background technology
SVG (StaticVarGenerator, static reacance generator) be a kind of by from the quasiconductor bridge circuit of commutation to carry out the device of dynamic passive compensation, SVG is powered by three phase mains, including control system and be connected to the multiple quasiconductor bridge circuits on every phase power supply, the signal that drives exported by control system regulates the phase and amplitude of quasiconductor bridge-type circuit AC side output voltage, this quasiconductor bridge circuit just can be made to absorb or send the reactive current meeting requirement, it is achieved the effect of dynamic passive compensation.
At present, the control method that the control system of SVG adopts is indirectly to control, and it is most widely used for meritorious-idle feedback decoupling control in indirectly controlling, but the control algorithm design of this control method is complex, and adopt the method when having error as SVG with mathematical model, the performance of SVG can be deteriorated even unstable, and namely the steady-state behaviour of this kind of control method is poor, is unfavorable for engineering practice.
Therefore, how to provide a kind of and design simple and that steady-state behaviour is good SVG control method and system is the problem that those skilled in the art are presently required solution.
Summary of the invention
It is an object of the invention to provide a kind of SVG control method and system, adopt PI control mode to obtain the driving signal of each cascade module, algorithm design is simple, and amount of calculation is little；And ensure that what obtain drives signal identical with the driving signal that expection obtains, the control stability controlling system is high, it is ensured that the steady-state behaviour of SVG, is beneficial to engineering practice.
For solving above-mentioned technical problem, the invention provides a kind of SVG control method, described SVG includes control system and 3N cascade module, and wherein, every phase power supply is connected with N number of described cascade module respectively, including:
Obtain the DC voltage of each described cascade module and it is carried out a PI control, obtaining the correction phase angle that each described cascade module is corresponding；
Obtain the single-phase mean direct voltage of 3N described cascade module and it is carried out the 2nd PI control, obtaining the modulating wave amplitude of described control system；
Calculate the reactive power of described control system, and the described reactive power obtained is carried out the 3rd PI control, obtain the phase shifting angle of described control system；
Obtain the three-phase voltage of described SVG and it is carried out phase-locked control, obtaining the locking phase of described control system；
3N the modulation wave signal corresponding to each described cascade module is obtained according to the described correction phase angle that described modulating wave amplitude, described phase shifting angle, described locking phase and each described cascade module are corresponding；3N described modulation wave signal is carried out pulsewidth modulation, obtains 3N the driving signal for being driven controlling to corresponding described cascade module.
Preferably, described oneth PI control process particularly as follows:
Carry out the DC voltage of each described cascade module with corresponding given module voltage respectively doing difference operation, obtain 3N the first difference result；
Respectively the 3N obtained a described first difference result is carried out the first proportional plus integral control, obtain 3N first and control result；
The given expection reactive power of described control system is carried out symbol decision, obtains judged result；
Controlling result by 3N described first to be multiplied with described judged result respectively, namely 3N the multiplied result obtained correspond to the correction phase angle of 3N described cascade module respectively.
Preferably, described 2nd PI control process particularly as follows:
Undertaken described single-phase mean direct voltage and given average voltage doing difference operation, obtain the second difference result；
Undertaken described single-phase mean direct voltage and described given average voltage doing ratio operation, obtain ratio result；
Described second difference result is carried out the second proportional plus integral control, obtains the second control result；
Controlling result and described ratio results added by described second, the summed result obtained is described modulating wave amplitude.
Preferably, described 3rd PI control process particularly as follows:
Described reactive power and described given expection reactive power are done difference operation, obtains power difference result；
Described power difference result is carried out the 3rd proportional plus integral control, and the 3rd obtained controls result and is described phase shifting angle.
Preferably, described 3N described modulation wave signal is carried out pulsewidth modulation, obtain the process of 3N driving signal for being driven controlling to corresponding described cascade module particularly as follows:
Being compared with triangular carrier respectively by 3N described modulation wave signal, 3N the signal obtained after having compared is the described driving signal corresponding to each described cascade module.
For solving above-mentioned technical problem, present invention also offers a kind of SVG and control system, described SVG includes control system and 3N cascade module, and wherein, every phase power supply is connected with N number of described cascade module respectively, including:
Single module DC voltage control module, for obtaining the DC voltage of each described cascade module and it being carried out a PI control, obtains the correction phase angle that each described cascade module is corresponding；
Single-phase mean direct voltage controls module, for obtaining the single-phase mean direct voltage of 3N described cascade module and it being carried out the 2nd PI control, obtains the modulating wave amplitude of described control system；
Reactive Power Control module, for calculating the reactive power of described control system, and carries out the 3rd PI control, obtains the phase shifting angle of described control system the described reactive power obtained；
Phase-locked loop module, for obtaining the three-phase voltage of described SVG and it being carried out phase-locked control, obtains the locking phase of described control system；
Drive signal generation module, for obtaining 3N the modulation wave signal corresponding to each described cascade module according to the described correction phase angle that described modulating wave amplitude, described phase shifting angle, described locking phase and each described cascade module are corresponding；3N described modulation wave signal is carried out pulsewidth modulation, obtains 3N the driving signal for being driven controlling to corresponding described cascade module.
Preferably, described single module DC voltage control module includes:
First adder, for carrying out the DC voltage of each described cascade module with corresponding given module voltage respectively doing difference operation, obtains 3N the first difference result；
Oneth PI controller, for respectively the 3N obtained a described first difference result being carried out the first proportional plus integral control, obtains 3N first and controls result；
Symbol decision unit, for the given expection reactive power of described control system is carried out symbol decision, obtains judged result；
First multiplier, is multiplied with described judged result respectively for controlling result by 3N described first, and namely 3N the multiplied result obtained correspond to the correction phase angle of 3N described cascade module respectively.
Preferably, described single-phase mean direct voltage control module includes:
Second adder, for being undertaken described single-phase mean direct voltage and given average voltage doing difference operation, obtains the second difference result；
Second multiplier, for being undertaken described single-phase mean direct voltage and described given average voltage doing ratio operation, obtains ratio result；
2nd PI controller, for described second difference result is carried out the second proportional plus integral control, obtains the second control result；
3rd adder, for controlling result and described ratio results added by described second, the summed result obtained is described modulating wave amplitude.
Preferably, described Reactive Power Control module includes:
4th adder, for described reactive power and described given expection reactive power are done difference operation, obtains power difference result；
3rd PI controller, for described power difference result is carried out the 3rd proportional plus integral control, the 3rd obtained controls result and is described phase shifting angle.
The invention provides a kind of SVG control method and system, adopt PI control mode to obtain correction phase angle corresponding to each cascade module, control the modulating wave amplitude of system, phase shifting angle and locking phase to obtain the driving signal of each cascade module.Owing to the PI control method controlled is simple, therefore algorithm design is also simple, and amount of calculation is little；And PI controls as closed loop control, the DC voltage in each cascade module can be controlled equal with corresponding given module voltage respectively, the single-phase mean direct voltage that can also control 3N cascade module is equal with given average voltage, additionally can also ensure that the reactive power of control system is equal with given expection reactive power, therefore adopt the driving signal that the PI driving signal controlling to obtain and expection obtain identical, the control stability of control system is high, this invention ensures that the steady-state behaviour of SVG, be beneficial to engineering practice.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, the accompanying drawing used required in prior art and embodiment will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the flow chart of the process of a kind of SVG control method provided by the invention；
Fig. 2 is the flow chart of the process that a PI controls in a kind of SVG control method provided by the invention；
Fig. 3 is the flow chart of the process that the 2nd PI controls in a kind of SVG control method provided by the invention；
Fig. 4 is the flow chart of the process that the 3rd PI controls in a kind of SVG control method provided by the invention；
Fig. 5 is a kind of SVG provided by the invention structural representation controlling system；
Fig. 6 is a kind of SVG provided by the invention concrete simulation architecture schematic diagram controlling system；
Wherein, in Fig. 6:
IabcThree-phase current, VabcThree-phase voltage, ω t locking phase, dq decompose active reactive decomposing module, PQ active reactive computing module, UdcThe DC voltage of single module, UdcrefGiven module voltage, δ revise phase angle, NdcSingle-phase mean direct voltage, NdcrefGiven average voltage, M modulating wave amplitude, Q reactive power, QrefGiven expection reactive power, θ phase shifting angle.
Detailed description of the invention
The core of the present invention is to provide a kind of SVG control method and system, adopts PI control mode to obtain the driving signal of each cascade module, and algorithm design is simple, and amount of calculation is little；And ensure that what obtain drives signal identical with the driving signal that expection obtains, the control stability controlling system is high, it is ensured that the steady-state behaviour of SVG, is beneficial to engineering practice.
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
The invention provides a kind of SVG control method, SVG includes control system and 3N cascade module, and wherein, every phase power supply is connected with N number of cascade module respectively, shown in Figure 1, and Fig. 1 is the flow chart of the process of a kind of SVG control method provided by the invention；The method includes:
Step s101: obtain the DC voltage of each cascade module and it is carried out a PI control, obtaining the correction phase angle that each cascade module is corresponding；
Step s102: obtain the single-phase mean direct voltage of 3N cascade module and it is carried out the 2nd PI control, obtaining the modulating wave amplitude of control system；
Wherein, single-phase mean direct voltage here refers to the average voltage level DC voltage of 3N cascade module being added divided by obtaining after 3, every voltage gone up mutually after dividing equally to three-phase by the DC voltage in whole 3N cascade module.
Step s103: the reactive power of calculating control system, and the reactive power obtained is carried out the 3rd PI control, obtain the phase shifting angle of control system；
Step s104: obtain the three-phase voltage of SVG and it is carried out phase-locked control, obtaining the locking phase of control system；
Step s105: obtain 3N the modulation wave signal corresponding to each cascade module according to the phase angle of revising that modulating wave amplitude, phase shifting angle, locking phase and each cascade module are corresponding；3N modulation wave signal is carried out pulsewidth modulation, obtains 3N the driving signal for being driven controlling to corresponding cascade module.
It should be noted that and there is no sequencing between step s101～s104, it is possible to carry out simultaneously.
Further, shown in Figure 2, Fig. 2 is the flow chart of the process that a PI controls in a kind of SVG control method provided by the invention；Oneth PI control process particularly as follows:
Step s201: carry out the DC voltage of each cascade module with corresponding given module voltage respectively doing difference operation, obtain 3N the first difference result；
Step s202: respectively the 3N obtained a first difference result is carried out the first proportional plus integral control, obtains 3N first and controls result；
Step s203: the given expection reactive power controlling system is carried out symbol decision, obtains judged result；
Step s204: controlling result by 3N first and be multiplied with judged result respectively, namely 3N the multiplied result obtained correspond to the correction phase angle of 3N cascade module respectively.
Wherein, there is no sequencing between step s201, step s202 and step s203, namely step s203 can carry out with step s201 simultaneously, it is also possible to carrying out with step s202, this is not construed as limiting by the present invention simultaneously.
It is understandable that, by given expection reactive power is judged, it is appreciated that now controlling system needs cascade module to be driven to carry out reactive current absorbing or releasing, and the judged result of symbol decision has positive and negative dividing, will determine that result controls result with first and is multiplied, the multiplied result obtained also has positive and negative dividing, therefore multiplied result is just or needs cascade module to be driven reactive current is absorbed or releases for negative namely representative.Certainly, when judged result is timing, representing and carry out reactive current absorbing or releasing and can be determined by practical situation, this is not construed as limiting by the present invention.
Further, since a PI controls to be closed loop control, therefore the DC voltage that this control can regulate in each cascade module is equal with corresponding given module voltage.Certainly, the size of the given module voltage that different cascade module are corresponding is likely to identical, it is also possible to different, and the size of the given module voltage corresponding to each cascade module needs to be wanted the control effect reached to determine by SVG.
Shown in Figure 3, Fig. 3 is the flow chart of process that in a kind of SVG control method provided by the invention, 2nd PI controls, process that the 2nd PI here controls particularly as follows:
Step s301: undertaken single-phase mean direct voltage and given average voltage doing difference operation, obtain the second difference result；
Step s302: undertaken single-phase mean direct voltage and given average voltage doing ratio operation, obtain ratio result；
Step s303: the second difference result is carried out the second proportional plus integral control, obtains the second control result；
Step s304: controlling result and ratio results added by second, the summed result obtained is modulating wave amplitude.
It should be noted that and there is no sequencing between step s302 and step s303 and step s301, namely step s302 can carry out with step s301 simultaneously, it is also possible to carrying out with step s303, this is not construed as limiting by the present invention simultaneously.
Additionally, due to when modulating wave amplitude is more big, the pulse width comparing the driving signal generated afterwards with triangular carrier is more narrow, namely dutycycle is more little, the output voltage amplitude of 3N cascade module AC is more little, single-phase mean direct voltage is indirectly caused to reduce, therefore in control process, the present invention using the ratio of single-phase mean direct voltage and given average voltage as base value, the output after the second proportional plus integral control of the difference of single-phase mean direct voltage and given average voltage is as fine setting, jointly regulate the single-phase mean direct voltage making SVG equal with given average voltage.
Shown in Figure 4, Fig. 4 is the flow chart of process that in a kind of SVG control method provided by the invention, 3rd PI controls, process that the 3rd PI here controls particularly as follows:
Step s401: reactive power is done difference operation with given expection reactive power, obtains power difference result；
Step s402: power difference result is carried out the 3rd proportional plus integral control, the 3rd obtained controls result and is phase shifting angle.
Wherein, here according to the control three-phase voltage of system, three-phase current and instantaneous reactive power theory, reactive power is calculated.
It addition, controlled by the 3rd PI, it is possible to regulate the SVG reactive power produced equal with given expection reactive power.
It is understandable that, by according to the size wanting the control effect reached to adjust given module voltage corresponding to each cascade module, given average voltage and given expection reactive power, namely the phase and amplitude of the output voltage of corresponding cascade module can be adjusted, so that the cascade circuit of 3N cascade module composition absorbs or releases the reactive current of expection size, realize the purpose of SVG reactive-load compensation.
It addition, here 3N modulation wave signal is carried out pulsewidth modulation, obtain the process of 3N driving signal for being driven controlling to corresponding cascade module particularly as follows:
Being compared with triangular carrier respectively by 3N modulation wave signal, 3N the signal obtained after having compared is the driving signal corresponding to each cascade module.
It is understood that the technology of driving signal generated above is phase-shifting carrier wave SPWM Technique, this technology can reduce the switching loss of single switch device in the occasion of high switching frequency.
As preferably, the method also includes:
Three-phase voltage and three-phase current to SVG carry out active reactive operation splitting respectively；
Obtain instantaneous active power and the instantaneous reactive power of SVG according to the voltage obtained after decomposing and electric current, and instantaneous active power and instantaneous reactive power output are displayed.
It is understood that namely active reactive operation splitting here is the three-phase voltage being in abc coordinate system and three-phase current are decomposed in active reactive coordinate system.And to the words that instantaneous active power and instantaneous reactive power display, it is possible to make staff recognize the power situation of SVG in time and control accordingly.
The invention provides a kind of SVG control method, adopt PI control mode to obtain correction phase angle corresponding to each cascade module, control the modulating wave amplitude of system, phase shifting angle and locking phase to obtain the driving signal of each cascade module.Owing to the PI control method controlled is simple, therefore algorithm design is also simple, and amount of calculation is little；And PI controls as closed loop control, the DC voltage in each cascade module can be controlled equal with corresponding given module voltage respectively, the single-phase mean direct voltage that can also control 3N cascade module is equal with given average voltage, additionally can also ensure that the reactive power of control system is equal with given expection reactive power, therefore adopt the driving signal that the PI driving signal controlling to obtain and expection obtain identical, the control stability of control system is high, this invention ensures that the steady-state behaviour of SVG, be beneficial to engineering practice.
Present invention also offers a kind of SVG and control system, SVG includes control system and 3N cascade module, and wherein, every phase power supply is connected with N number of cascade module respectively, shown in Figure 5, and Fig. 5 is a kind of SVG provided by the invention structural representation controlling system；This system includes:
Single module DC voltage control module 11, for obtaining the DC voltage of each cascade module and it being carried out a PI control, obtains the correction phase angle that each cascade module is corresponding；
Single-phase mean direct voltage controls module 12, for obtaining the single-phase mean direct voltage of 3N cascade module and it being carried out the 2nd PI control, obtains the modulating wave amplitude of control system；
Reactive Power Control module 13, for the reactive power of calculating control system, and carries out the 3rd PI control, obtains the phase shifting angle of control system the reactive power obtained；
Phase-locked loop module 14, for obtaining the three-phase voltage of SVG and it being carried out phase-locked control, obtains the locking phase of control system；
Drive signal generation module 15, obtain 3N the modulation wave signal corresponding to each cascade module for the phase angle of revising corresponding according to modulating wave amplitude, phase shifting angle, locking phase and each cascade module；3N modulation wave signal is carried out pulsewidth modulation, obtains 3N the driving signal for being driven controlling to corresponding cascade module.
Wherein, SVG here is connected with three phase mains by connecting impedance.
Shown in Figure 6, Fig. 6 is a kind of SVG provided by the invention concrete simulation architecture schematic diagram controlling system；Here single module DC voltage control module 11 includes:
First adder 111, for carrying out the DC voltage of each cascade module with corresponding given module voltage respectively doing difference operation, obtains 3N the first difference result；
Oneth PI controller 112, for respectively the 3N obtained a first difference result being carried out the first proportional plus integral control, obtains 3N first and controls result；
Symbol decision unit 113, for the given expection reactive power controlling system is carried out symbol decision, obtains judged result；
First multiplier 114, is multiplied with judged result respectively for controlling result by 3N first, and namely 3N the multiplied result obtained correspond to the correction phase angle of 3N cascade module respectively.
Include it addition, single-phase mean direct voltage here controls module 12:
Second adder 121, for being undertaken single-phase mean direct voltage and given average voltage doing difference operation, obtains the second difference result；
Second multiplier 122, for being undertaken single-phase mean direct voltage and given average voltage doing ratio operation, obtains ratio result；
2nd PI controller 123, for the second difference result is carried out the second proportional plus integral control, obtains the second control result；
3rd adder 124, for controlling result and ratio results added by second, the summed result obtained is modulating wave amplitude.
It addition, Reactive Power Control module 13 here includes:
4th adder 131, for reactive power is done difference operation with given expection reactive power, obtains power difference result；
3rd PI controller 132, for power difference result is carried out the 3rd proportional plus integral control, the 3rd obtained controls result and is phase shifting angle.
As preferably, this system also includes:
Active reactive decomposing module, for carrying out active reactive operation splitting respectively to three-phase voltage and the three-phase current of SVG；
Active reactive computing module, for obtaining instantaneous active power and the instantaneous reactive power of SVG according to the voltage obtained after decomposing and electric current, and displays instantaneous active power and instantaneous reactive power output to display module.
The invention provides a kind of SVG and control system, adopt PI control mode to obtain correction phase angle corresponding to each cascade module, control the modulating wave amplitude of system, phase shifting angle and locking phase to obtain the driving signal of each cascade module.Owing to the PI control method controlled is simple, therefore algorithm design is also simple, and amount of calculation is little；And PI controls as closed loop control, the DC voltage in each cascade module can be controlled equal with corresponding given module voltage respectively, the single-phase mean direct voltage that can also control 3N cascade module is equal with given average voltage, additionally can also ensure that the reactive power of control system is equal with given expection reactive power, therefore adopt the driving signal that the PI driving signal controlling to obtain and expection obtain identical, the control stability of control system is high, this invention ensures that the steady-state behaviour of SVG, be beneficial to engineering practice.
It should be noted that, in this manual, the relational terms of such as first and second or the like is used merely to separate an entity or operation with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " includes ", " comprising " or its any other variant are intended to comprising of nonexcludability, so that include the process of a series of key element, method, article or equipment not only include those key elements, but also include other key elements being not expressly set out, or also include the key element intrinsic for this process, method, article or equipment.When there is no more restriction, statement " including ... " key element limited, it is not excluded that there is also other identical element in including the process of described key element, method, article or equipment.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses the present invention.The multiple amendment of these embodiments be will be apparent from for those skilled in the art, and generic principles defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein, and is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (9)
1. a SVG control method, described SVG includes control system and 3N cascade module, and wherein, every phase power supply is connected with N number of described cascade module respectively, it is characterised in that including:
Obtain the DC voltage of each described cascade module and it is carried out a PI control, obtaining the correction phase angle that each described cascade module is corresponding；
Obtain the single-phase mean direct voltage of 3N described cascade module and it is carried out the 2nd PI control, obtaining the modulating wave amplitude of described control system；
Calculate the reactive power of described control system, and the described reactive power obtained is carried out the 3rd PI control, obtain the phase shifting angle of described control system；
Obtain the three-phase voltage of described SVG and it is carried out phase-locked control, obtaining the locking phase of described control system；
3N the modulation wave signal corresponding to each described cascade module is obtained according to the described correction phase angle that described modulating wave amplitude, described phase shifting angle, described locking phase and each described cascade module are corresponding；3N described modulation wave signal is carried out pulsewidth modulation, obtains 3N the driving signal for being driven controlling to corresponding described cascade module.
2. method according to claim 1, it is characterised in that described oneth PI control process particularly as follows:
Carry out the DC voltage of each described cascade module with corresponding given module voltage respectively doing difference operation, obtain 3N the first difference result；
Respectively the 3N obtained a described first difference result is carried out the first proportional plus integral control, obtain 3N first and control result；
The given expection reactive power of described control system is carried out symbol decision, obtains judged result；
Controlling result by 3N described first to be multiplied with described judged result respectively, namely 3N the multiplied result obtained correspond to the correction phase angle of 3N described cascade module respectively.
3. method according to claim 1, it is characterised in that described 2nd PI control process particularly as follows:
Undertaken described single-phase mean direct voltage and given average voltage doing difference operation, obtain the second difference result；
Undertaken described single-phase mean direct voltage and described given average voltage doing ratio operation, obtain ratio result；
Described second difference result is carried out the second proportional plus integral control, obtains the second control result；
Controlling result and described ratio results added by described second, the summed result obtained is described modulating wave amplitude.
4. method according to claim 1, it is characterised in that described 3rd PI control process particularly as follows:
Described reactive power and described given expection reactive power are done difference operation, obtains power difference result；
Described power difference result is carried out the 3rd proportional plus integral control, and the 3rd obtained controls result and is described phase shifting angle.
5. method according to claim 1, it is characterised in that described 3N described modulation wave signal is carried out pulsewidth modulation, obtain the process of 3N driving signal for being driven controlling to corresponding described cascade module particularly as follows:
Being compared with triangular carrier respectively by 3N described modulation wave signal, 3N the signal obtained after having compared is the described driving signal corresponding to each described cascade module.
6. SVG controls a system, and described SVG includes control system and 3N cascade module, and wherein, every phase power supply is connected with N number of described cascade module respectively, it is characterised in that including:
Single module DC voltage control module, for obtaining the DC voltage of each described cascade module and it being carried out a PI control, obtains the correction phase angle that each described cascade module is corresponding；
Single-phase mean direct voltage controls module, for obtaining the single-phase mean direct voltage of 3N described cascade module and it being carried out the 2nd PI control, obtains the modulating wave amplitude of described control system；
Reactive Power Control module, for calculating the reactive power of described control system, and carries out the 3rd PI control, obtains the phase shifting angle of described control system the described reactive power obtained；
Phase-locked loop module, for obtaining the three-phase voltage of described SVG and it being carried out phase-locked control, obtains the locking phase of described control system；
Drive signal generation module, for obtaining 3N the modulation wave signal corresponding to each described cascade module according to the described correction phase angle that described modulating wave amplitude, described phase shifting angle, described locking phase and each described cascade module are corresponding；3N described modulation wave signal is carried out pulsewidth modulation, obtains 3N the driving signal for being driven controlling to corresponding described cascade module.
7. system according to claim 6, it is characterised in that described single module DC voltage controls module and includes:
First adder, for carrying out the DC voltage of each described cascade module with corresponding given module voltage respectively doing difference operation, obtains 3N the first difference result；
Oneth PI controller, for respectively the 3N obtained a described first difference result being carried out the first proportional plus integral control, obtains 3N first and controls result；
Symbol decision unit, for the given expection reactive power of described control system is carried out symbol decision, obtains judged result；
First multiplier, is multiplied with described judged result respectively for controlling result by 3N described first, and namely 3N the multiplied result obtained correspond to the correction phase angle of 3N described cascade module respectively.
8. system according to claim 6, it is characterised in that described single-phase mean direct voltage controls module and includes:
Second adder, for being undertaken described single-phase mean direct voltage and given average voltage doing difference operation, obtains the second difference result；
Second multiplier, for being undertaken described single-phase mean direct voltage and described given average voltage doing ratio operation, obtains ratio result；
2nd PI controller, for described second difference result is carried out the second proportional plus integral control, obtains the second control result；
3rd adder, for controlling result and described ratio results added by described second, the summed result obtained is described modulating wave amplitude.
9. system according to claim 6, it is characterised in that described Reactive Power Control module includes:
4th adder, for described reactive power and described given expection reactive power are done difference operation, obtains power difference result；
3rd PI controller, for described power difference result is carried out the 3rd proportional plus integral control, the 3rd obtained controls result and is described phase shifting angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610271806.3A CN105790285B (en) | 2016-04-27 | 2016-04-27 | A kind of SVG control methods and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610271806.3A CN105790285B (en) | 2016-04-27 | 2016-04-27 | A kind of SVG control methods and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105790285A true CN105790285A (en) | 2016-07-20 |
| CN105790285B CN105790285B (en) | 2018-07-24 |
Family
ID=56399804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610271806.3A Active CN105790285B (en) | 2016-04-27 | 2016-04-27 | A kind of SVG control methods and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105790285B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545235A (en) * | 2010-12-31 | 2012-07-04 | 清华大学 | Triangular connection type comprehensive compensation system integrated with cascaded active filter and reactive compensator |
| CN103545828A (en) * | 2013-11-04 | 2014-01-29 | 湖南大学 | Method for controlling split phases of star-shaped chained SVG under unbalanced condition |
| CN105239106A (en) * | 2012-12-13 | 2016-01-13 | 朱海燕 | Chain type SVG (static var generator) device for correctable power factor for three-phase power supply |
-
2016
- 2016-04-27 CN CN201610271806.3A patent/CN105790285B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102545235A (en) * | 2010-12-31 | 2012-07-04 | 清华大学 | Triangular connection type comprehensive compensation system integrated with cascaded active filter and reactive compensator |
| CN105239106A (en) * | 2012-12-13 | 2016-01-13 | 朱海燕 | Chain type SVG (static var generator) device for correctable power factor for three-phase power supply |
| CN103545828A (en) * | 2013-11-04 | 2014-01-29 | 湖南大学 | Method for controlling split phases of star-shaped chained SVG under unbalanced condition |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105790285B (en) | 2018-07-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Banaei et al. | New multilevel inverter with reduction of switches and gate driver | |
| Kashif et al. | Design and implementation of a three-level active power filter for harmonic and reactive power compensation | |
| EP3920392A1 (en) | Control method and device for three-phase ac system | |
| CN103888007B (en) | The inverter parallel loop current suppression system with two carrier modulation is controlled based on PR | |
| CN104682751B (en) | Modularization based on PAM and PWM hybrid modulations cascades multilevel converter | |
| CN102223100A (en) | Control method of three-phase grid-connected inverter based on modified proportional resonant regulator | |
| CN110995115A (en) | Improved three-dimensional space vector modulation method and system | |
| CN110429603B (en) | Six-switch seven-level active power filter and compensation method | |
| CN110829870B (en) | Control method of modular multilevel converter in low-frequency operation state | |
| CN111864766A (en) | Control method for additional damping of direct current power transmission system based on angular frequency change rate | |
| Merai et al. | Grid connected converters as reactive power ancillary service providers: Technical analysis for minimum required DC-link voltage | |
| CN109347211B (en) | Asymmetric cascade multilevel hybrid energy storage control method | |
| CN103441488A (en) | Control method of flexible direct current transmission system with power quality control function | |
| Cirrincione et al. | Direct power control of three-phase VSIs for the minimization of common-mode emissions in distributed generation systems | |
| JP2011055591A (en) | Inverter control circuit and grid-connected inverter system with the same | |
| CN102623996B (en) | Active power filter closed loop control method based on decoupling resonance regulator array | |
| CN105790285A (en) | SVG control method and SVG control system | |
| CN104300542B (en) | A kind of eliminate method and the device that grid-connected current is affected by electrical network background harmonics | |
| CN106877711A (en) | A kind of single-phase cascade PWM rectifier no phase-locked loop pressure equalizing control method | |
| CN115459568A (en) | Common-mode voltage suppression method and system of quasi-Z-source simplified three-level inverter | |
| Tian et al. | Virtual impedance refined inductor current observation and current sensorless control for grid-connected inverter | |
| CN107154640A (en) | A kind of collaboration modulator approach suitable for the Mixed cascading photovoltaic system with energy storage | |
| Neyshabouri et al. | Control of a transformer-less cascaded H-bridge based STATCOM using low-frequency selective harmonic elimination technique | |
| CN112510769A (en) | Alternating current-direct current hybrid power supply system and online impedance scanning analysis method thereof | |
| Jena et al. | Comparative study between different control strategies for shunt active power filter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |