CN105790285B - A kind of SVG control methods and system - Google Patents
A kind of SVG control methods and system Download PDFInfo
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- CN105790285B CN105790285B CN201610271806.3A CN201610271806A CN105790285B CN 105790285 B CN105790285 B CN 105790285B CN 201610271806 A CN201610271806 A CN 201610271806A CN 105790285 B CN105790285 B CN 105790285B
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Abstract
The invention discloses a kind of SVG control methods and systems, SVG includes control system and 3N cascade module, it is connected respectively with N number of cascade module per phase power supply, including obtains the DC voltage of each cascade module and carry out the first PI controls to it, obtains the corresponding amendment phase angle of each cascade module；It obtains the single-phase mean direct voltage of 3N cascade module and carries out the 2nd PI controls to it, obtain the modulation wave amplitude of control system；The reactive power of calculating control system simultaneously carries out it the 3rd PI controls, obtains the phase shifting angle of control system；It obtains the three-phase voltage of SVG and it is controlled into horizontal lock, obtain the locking phase of control system；The 3N modulation wave signal corresponding to each cascade module is obtained according to modulation wave amplitude, phase shifting angle, locking phase and the corresponding amendment phase angle of each cascade module and pulsewidth modulation is carried out to it, obtains the 3N drive signal for the corresponding cascade module of drive control.The present invention uses PI control modes, and algorithm design is simple, and control stability is high.
Description
Technical field
The present invention relates to reactive power compensation technology fields, more particularly to a kind of SVG control methods and system.
Background technology
SVG (Static Var Generator, static reactive generator) is a kind of semiconductor bridge-type electricity by from commutation
Road carries out the device of dynamic passive compensation, and SVG powers by three phase mains, including control system and is connected to every phase electricity
Multiple semiconductor bridge circuits on source adjust semiconductor bridge-type circuit AC side by the drive signal of control system output
The phase and amplitude of output voltage, so that it may so that the semiconductor bridge circuit is absorbed or is sent out the reactive current met the requirements, it is real
The effect of existing dynamic passive compensation.
Currently, the control method that the control system of SVG uses is based on indirect control, and it is most widely used in indirect control
It is active-idle feedback decoupling control, but the control algorithm design of the control method is complex, and existed using this method
When SVG and mathematical model have error, the performance of SVG can be deteriorated even unstable, i.e., the steady-state behaviour of this kind control method is poor,
It is unfavorable for engineering practice.
Therefore, how to provide a kind of design is simple and steady-state behaviour is good SVG control methods and system is art technology
The current problem to be solved of personnel.
Invention content
The object of the present invention is to provide a kind of SVG control methods and systems, and each cascade is obtained using PI control modes
The drive signal of module, algorithm design is simple, and calculation amount is small；And the driving that the drive signal that can ensure is obtained with expection
Signal is identical, and the control stability of control system is high, ensure that the steady-state behaviour of SVG, is conducive to engineering practice.
In order to solve the above technical problems, the present invention provides a kind of SVG control methods, the SVG include control system with
And 3N cascade module, wherein it is connected respectively with N number of cascade module per phase power supply, including：
It obtains the DC voltage of each cascade module and carries out the first PI controls to it, obtain each grade gang mould
The corresponding amendment phase angle of block；
It obtains the single-phase mean direct voltage of the 3N cascade modules and carries out the 2nd PI controls to it, obtain the control
The modulation wave amplitude of system processed；
The reactive power of the control system is calculated, and the reactive power to obtaining carries out the 3rd PI controls, obtains
The phase shifting angle of the control system；
It obtains the three-phase voltage of the SVG and it is controlled into horizontal lock, obtain the locking phase of the control system；
It is corresponding according to the modulation wave amplitude, the phase shifting angle, the locking phase and each cascade module
The phase angle of correcting obtains 3N modulation wave signal for corresponding to each cascade module；To 3N modulation wave signals into
Row pulsewidth modulation obtains the 3N drive signal for carrying out drive control to the corresponding cascade module.
Preferably, the process of the first PI controls is specially：
Respectively the DC voltage of each cascade module is carried out making poor operation with corresponding given module voltage, be obtained
3N the first difference results；
The first proportional plus integral control is carried out to 3N obtained the first difference results respectively, obtains 3N first control
As a result；
Symbol decision is carried out to the given expected reactive power of the control system, obtains judging result；
3N first control results are multiplied with the judging result respectively, 3N obtained multiplied result is distinguished
Correspond to the amendment phase angle of the 3N cascade modules.
Preferably, the process of the 2nd PI controls is specially：
It carries out the single-phase mean direct voltage and given average voltage to make poor operation, obtains the second difference result；
The single-phase mean direct voltage and the given average voltage make, than operation, to obtain ratio result；
Second proportional plus integral control is carried out to the second difference result, obtains the second control result；
By second control result and the ratio results added, obtained summed result is the modulation wave amplitude
Value.
Preferably, the process of the 3rd PI controls is specially：
The reactive power and the given expected reactive power are carried out making poor operation, obtain power difference result；
Third proportional plus integral control is carried out to the power difference result, obtained third control result is the phase shift
Angle.
Preferably, described that pulsewidth modulation is carried out to the 3N modulation wave signals, it obtains for the corresponding cascade
The process of 3N drive signal that module carries out drive control is specially：
The 3N modulation wave signals are compared with triangular carrier respectively, the 3N signal relatively obtained after the completion
As correspond to the drive signal of each cascade module.
In order to solve the above technical problems, the present invention also provides a kind of SVG control systems, the SVG includes control system
And 3N cascade module, wherein it is connected respectively with N number of cascade module per phase power supply, including：
Single module DC voltage control module, DC voltage for obtaining each cascade module simultaneously carry out it
One PI is controlled, and obtains the corresponding amendment phase angle of each cascade module；
Single-phase mean direct voltage control module, for obtaining the single-phase mean direct voltage of the 3N cascade modules simultaneously
The 2nd PI controls are carried out to it, obtain the modulation wave amplitude of the control system；
Reactive Power Control module, the reactive power for calculating the control system, and the idle work(to obtaining
Rate carries out the 3rd PI controls, obtains the phase shifting angle of the control system；
Phase-locked loop module, three-phase voltage for obtaining the SVG simultaneously control it into horizontal lock, and obtaining the control is
The locking phase of system；
Drive signal generation module, for according to the modulation wave amplitude, the phase shifting angle, the locking phase and often
The corresponding phase angle of correcting of a cascade module obtains 3N modulation wave signal for corresponding to each cascade module；It is right
The 3N modulation wave signals carry out pulsewidth modulation, obtain for carrying out 3N of drive control to the corresponding cascade module
Drive signal.
Preferably, the single module DC voltage control module includes：
First adder, for respectively by the DC voltage of each cascade module and corresponding given module voltage into
Row makees difference operation, obtains 3N the first difference results；
First PI controllers, for carrying out the first proportional integration control to 3N obtained the first difference results respectively
System obtains 3N the first control results；
Symbol decision unit carries out symbol decision for the given expected reactive power to the control system, is sentenced
Disconnected result；
First multiplier, for 3N first control results to be multiplied with the judging result respectively, obtained 3N
A multiplied result corresponds to the amendment phase angle of the 3N cascade modules respectively.
Preferably, the single-phase mean direct voltage control module includes：
Second adder is obtained for carrying out the single-phase mean direct voltage and given average voltage to make poor operation
Second difference result；
Second multiplier, for the single-phase mean direct voltage and the given average voltage make than operation,
Obtain ratio result；
2nd PI controllers obtain the second control for carrying out the second proportional plus integral control to the second difference result
As a result；
Third adder, for by second control result and the ratio results added, obtained summed result to be i.e.
For the modulation wave amplitude.
Preferably, the Reactive Power Control module includes：
4th adder is obtained for carrying out making poor operation to the reactive power and the given expected reactive power
Power difference result；
3rd PI controllers, for carrying out third proportional plus integral control, obtained third control to the power difference result
Result processed is the phase shifting angle.
The present invention provides a kind of SVG control methods and systems, and each cascade module pair is obtained using PI control modes
Modulation wave amplitude, phase shifting angle and the locking phase of the amendment phase angle, control system answered obtains the driving of each cascade module
Signal.Since the control method of PI controls is simple, therefore algorithm design is also simple, and calculation amount is small；And PI controls are closed-loop control, energy
The DC voltage enough controlled in each cascade module is equal with corresponding given module voltage respectively, moreover it is possible to control 3N grade gang mould
The single-phase mean direct voltage of block is equal with given average voltage, in addition can also ensure that the reactive power of control system and gives
It is expected that reactive power is equal, therefore the drive signal controlled using PI is identical as expected obtained drive signal, control system
Control stability it is high, this invention ensures that the steady-state behaviour of SVG, is conducive to engineering practice.
Description of the drawings
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to institute in the prior art and embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is a kind of flow chart of the process of SVG control methods provided by the invention；
Fig. 2 is the flow chart for the process that first PI is controlled in a kind of SVG control methods provided by the invention；
Fig. 3 is the flow chart for the process that 2nd PI is controlled in a kind of SVG control methods provided by the invention；
Fig. 4 is the flow chart for the process that 3rd PI is controlled in a kind of SVG control methods provided by the invention；
Fig. 5 is a kind of structural schematic diagram of SVG control systems provided by the invention；
Fig. 6 is a kind of specific simulation architecture schematic diagram of SVG control systems provided by the invention；
Wherein, in Fig. 6：
Iabc- three-phase current, Vabc- three-phase voltage, ω t-locking phase, dq decomposition-active reactive decomposing module,
PQ-active reactive computing module, UdcDC voltage, the U of-single moduledcref- given module voltage, δ-amendment phase angle,
Ndc- single-phase mean direct voltage, Ndcref- give average voltage, M-modulation wave amplitude, Q-reactive power, Qref- given
It is expected that reactive power, θ-phase shifting angle.
Specific implementation mode
Core of the invention is to provide a kind of SVG control methods and system, and each cascade is obtained using PI control modes
The drive signal of module, algorithm design is simple, and calculation amount is small；And the driving that the drive signal that can ensure is obtained with expection
Signal is identical, and the control stability of control system is high, ensure that the steady-state behaviour of SVG, is conducive to engineering practice.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
The every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of SVG control methods, SVG includes control system and 3N cascade module, wherein per phase
Power supply is connected with N number of cascade module respectively, shown in Figure 1, and Fig. 1 is a kind of process of SVG control methods provided by the invention
Flow chart；This method includes：
Step s101：It obtains the DC voltage of each cascade module and carries out the first PI controls to it, obtain each cascade
The corresponding amendment phase angle of module；
Step s102：It obtains the single-phase mean direct voltage of 3N cascade module and carries out the 2nd PI controls to it, obtain
The modulation wave amplitude of control system；
Wherein, after single-phase mean direct voltage here refers to the DC voltage addition divided by 3 by 3N cascade module
Obtained average voltage level, i.e., the voltage after dividing equally the DC voltage in whole 3N cascade modules to three-phase in every phase.
Step s103：The reactive power of calculating control system, and the reactive power to obtaining carries out the 3rd PI controls, obtains
The phase shifting angle of control system；
Step s104：It obtains the three-phase voltage of SVG and it is controlled into horizontal lock, obtain the locking phase of control system；
Step s105：According to modulation wave amplitude, phase shifting angle, locking phase and the corresponding amendment phase angle of each cascade module
Obtain the 3N modulation wave signal corresponding to each cascade module；Pulsewidth modulation is carried out to 3N modulation wave signal, is used for
3N drive signal of drive control is carried out to corresponding cascade module.
It should be noted that having no sequencing between step s101~s104, can be carried out at the same time.
Further, shown in Figure 2, Fig. 2 is the mistake that first PI is controlled in a kind of SVG control methods provided by the invention
The flow chart of journey；First PI control process be specially：
Step s201：Respectively the DC voltage of each cascade module is carried out making poor behaviour with corresponding given module voltage
Make, obtains 3N the first difference results；
Step s202：The first proportional plus integral controls are carried out to obtained 3N the first difference results respectively, obtain 3N the
One control result；
Step s203：Symbol decision is carried out to the given expected reactive power of control system, obtains judging result；
Step s204：3N the first control results are multiplied with judging result respectively, 3N obtained multiplied result is divided
The amendment phase angle of 3N cascade module is not corresponded to.
Wherein, sequencing step s201, is had no between step s202 and step s203, i.e. step s203 can be with step
S201 is carried out at the same time, and can also be carried out at the same time with step s202, this is not limited by the present invention.
It is understood that by judging given expected reactive power, control system needs at this time can be learnt
Cascade module to be driven to reactive current absorb or be released, and the judging result of symbol decision is divided into positive and negative, general
Judging result is multiplied with the first control result, obtained multiplied result be also divided into it is positive and negative, therefore multiplied result be just or be it is negative i.e.
It represents and cascade module to be driven is needed to absorb or release reactive current.Certainly, when judging result is timing, expression pair
Reactive current absorb or release can be by actual conditions depending on, this is not limited by the present invention.
In addition, since the first PI controls are closed-loop control, therefore the control can adjust the DC voltage in each cascade module
It is equal with corresponding given module voltage.Certainly, the size of the corresponding given module voltage of different cascade modules may be identical,
May be different, the size of the given module voltage corresponding to each cascade module need by SVG think control effect to be achieved Lai
It determines.
Shown in Figure 3, Fig. 3 is the flow for the process that 2nd PI is controlled in a kind of SVG control methods provided by the invention
Scheme, the process of the 2nd PI controls here is specially：
Step s301：It carries out single-phase mean direct voltage and given average voltage to make poor operation, obtains the second difference knot
Fruit；
Step s302：Single-phase mean direct voltage and given average voltage make, than operation, to obtain ratio result；
Step s303：Second proportional plus integral control is carried out to the second difference result, obtains the second control result；
Step s304：By the second control result and ratio results added, obtained summed result is to modulate wave amplitude.
It should be noted that having no sequencing, i.e. step between step s302 and step s303 and step s301
S302 can be carried out at the same time with step s301, can also be carried out at the same time with step s303, this is not limited by the present invention.
In addition, due to when modulate wave amplitude it is bigger when, the pulse of the drive signal generated more afterwards with triangular carrier is wide
Degree is narrower, i.e., duty ratio is smaller, and the output voltage amplitude of 3N cascade module exchange side is smaller, causes single-phase mean direct indirectly
Voltage reduces, therefore during control, the present invention using the ratio of single-phase mean direct voltage and given average voltage as base value,
The output of single-phase mean direct voltage and the difference of given average voltage after the second proportional plus integral control is as finely tuning, to be total to
Keep the single-phase mean direct voltage of SVG equal with given average voltage with adjusting.
Shown in Figure 4, Fig. 4 is the flow for the process that 3rd PI is controlled in a kind of SVG control methods provided by the invention
Scheme, the process of the 3rd PI controls here is specially：
Step s401：Reactive power and given expected reactive power are carried out making poor operation, obtain power difference result；
Step s402：Third proportional plus integral control is carried out to power difference result, obtained third control result is to move
Phase angle.
Wherein, come to idle here according to the three-phase voltage of control system, three-phase current and instantaneous reactive power theory
Power is calculated.
In addition, being controlled by the 3rd PI, the reactive power that can adjust SVG generations is equal with given expected reactive power.
It is understood that corresponding to cover half by adjusting each cascade module according to control effect to be achieved is thought
The size of block voltage, given average voltage and given expected reactive power, can be to the output electricity of corresponding cascade module
The phase and amplitude of pressure is adjusted, to make the cascade circuit of 3N cascade module composition absorb or release the nothing of expected size
Work(electric current, to realize the purpose of SVG reactive-load compensations.
In addition, here pulsewidth modulation is carried out to 3N modulation wave signal, obtain for being carried out to corresponding cascade module
The process of 3N drive signal of drive control is specially：
3N modulation wave signal is compared with triangular carrier respectively, the 3N signal relatively obtained after the completion is
Corresponding to the drive signal of each cascade module.
It is understood that the technology for generating drive signal above is phase-shifting carrier wave SPWM Technique, the technology
The switching loss of single switch device can be reduced in the occasion of high switching frequency.
Preferably, this method further includes：
Three-phase voltage and three-phase current to SVG carry out active reactive operation splitting respectively；
The instantaneous active power and instantaneous reactive power of SVG is obtained according to the voltage and electric current that are obtained after decomposition, and
Instantaneous active power and instantaneous reactive power output are shown.
It is understood that active reactive operation splitting here be by the three-phase voltage on abc coordinate systems with
And three-phase current decomposes on active reactive coordinate system.And instantaneous active power and instantaneous reactive power are shown
Words, can make staff recognize the power situation of SVG in time and be controlled accordingly.
The present invention provides a kind of SVG control methods, obtain that each cascade module is corresponding to repair using PI control modes
Positive phase angle, control system modulation wave amplitude, phase shifting angle and locking phase obtain the drive signal of each cascade module.By
It is simple in the control method of PI controls, therefore algorithm design is also simple, calculation amount is small；And PI controls are closed-loop control, can be controlled
DC voltage in each cascade module is equal with corresponding given module voltage respectively, moreover it is possible to control the list of 3N cascade module
Phase average DC voltage is equal with given average voltage, in addition can also ensure that the reactive power of control system and given expected nothing
Work(power is equal, therefore the drive signal controlled using PI is identical as expected obtained drive signal, the control of control system
Stability is high, this invention ensures that the steady-state behaviour of SVG, is conducive to engineering practice.
The present invention also provides a kind of SVG control systems, SVG includes control system and 3N cascade module, 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 knot of SVG control systems provided by the invention
Structure schematic diagram；The system includes：
Single module DC voltage control module 11, DC voltage for obtaining each cascade module simultaneously carry out first to it
PI is controlled, and obtains the corresponding amendment phase angle of each cascade module；
Single-phase mean direct voltage control module 12, single-phase mean direct voltage for obtaining 3N cascade module are simultaneously right
It carries out the 2nd PI controls, obtains the modulation wave amplitude of control system；
Reactive Power Control module 13 is used for the reactive power of calculating control system, and the reactive power to obtaining carries out
3rd PI is controlled, and obtains the phase shifting angle of control system；
Phase-locked loop module 14, three-phase voltage for obtaining SVG simultaneously control it into horizontal lock, obtain the same of control system
Walk phase；
Drive signal generation module 15, for according to modulation wave amplitude, phase shifting angle, locking phase and each cascade module
Corresponding phase angle of correcting obtains the 3N modulation wave signal corresponding to each cascade module；Pulsewidth is carried out to 3N modulation wave signal
Modulation obtains the 3N drive signal for carrying out drive control to corresponding cascade module.
Wherein, SVG here is connected by connecting impedance with three phase mains.
Shown in Figure 6, Fig. 6 is a kind of specific simulation architecture schematic diagram of SVG control systems provided by the invention；Here
Single module DC voltage control module 11 include：
First adder 111, for respectively by the DC voltage of each cascade module and corresponding given module voltage into
Row makees difference operation, obtains 3N the first difference results；
First PI controllers 112, for carrying out the first proportional plus integral control to 3N obtained the first difference results respectively,
Obtain 3N the first control results；
Symbol decision unit 113 carries out symbol decision for the given expected reactive power to control system, is judged
As a result；
First multiplier 114, for 3N the first control results to be multiplied with judging result respectively, 3N obtained multiplication
As a result the amendment phase angle of 3N cascade module is corresponded to respectively.
In addition, single-phase mean direct voltage control module 12 here includes：
Second adder 121 obtains for carrying out single-phase mean direct voltage and given average voltage to make poor operation
Two difference results；
Second multiplier 122, for make, than operation, being compared single-phase mean direct voltage and given average voltage
It is worth result；
2nd PI controllers 123 obtain the second control knot for carrying out the second proportional plus integral control to the second difference result
Fruit；
Third adder 124, the summed result for by the second control result and ratio results added, obtaining are to modulate
Wave amplitude.
In addition, Reactive Power Control module 13 here includes：
4th adder 131 obtains difference power for carrying out making poor operation to reactive power and given expected reactive power
It is worth result；
3rd PI controllers 132, for carrying out third proportional plus integral control to power difference result, obtained third control
As a result it is phase shifting angle.
Preferably, which further includes：
Active reactive decomposing module, for SVG three-phase voltage and three-phase current carry out active reactive decomposition respectively
Operation；
Active reactive computing module, for obtaining the instantaneous active work(of SVG according to the voltage and electric current that are obtained after decomposition
Rate and instantaneous reactive power, and instantaneous active power and instantaneous reactive power are exported to display module and shown.
The present invention provides a kind of SVG control systems, obtain that each cascade module is corresponding to repair using PI control modes
Positive phase angle, control system modulation wave amplitude, phase shifting angle and locking phase obtain the drive signal of each cascade module.By
It is simple in the control method of PI controls, therefore algorithm design is also simple, calculation amount is small；And PI controls are closed-loop control, can be controlled
DC voltage in each cascade module is equal with corresponding given module voltage respectively, moreover it is possible to control the list of 3N cascade module
Phase average DC voltage is equal with given average voltage, in addition can also ensure that the reactive power of control system and given expected nothing
Work(power is equal, therefore the drive signal controlled using PI is identical as expected obtained drive signal, the control of control system
Stability is high, this invention ensures that the steady-state behaviour of SVG, is conducive to engineering practice.
It should be noted that in the present specification, relational terms such as first and second and the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in the process, method, article or apparatus that includes the element.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and the principles and novel features disclosed herein phase one
The widest range caused.
Claims (3)
1. a kind of SVG control methods, the SVG includes control system and 3N cascade module, wherein per phase power supply respectively with
N number of cascade module is connected, which is characterized in that including：
It obtains the DC voltage of each cascade module and carries out the first PI controls to it, obtain each cascade module pair
The amendment phase angle answered；
It obtains the single-phase mean direct voltage of the 3N cascade modules and carries out the 2nd PI controls to it, obtain the control system
The modulation wave amplitude of system；
The reactive power of the control system is calculated, and the reactive power to obtaining carries out the 3rd PI controls, obtained described
The phase shifting angle of control system；
It obtains the three-phase voltage of the SVG and it is controlled into horizontal lock, obtain the locking phase of the control system；
It is corresponding described according to the modulation wave amplitude, the phase shifting angle, the locking phase and each cascade module
It corrects phase angle and obtains 3N modulation wave signal for corresponding to each cascade module；Arteries and veins is carried out to the 3N modulation wave signals
Width modulation obtains the 3N drive signal for carrying out drive control to the corresponding cascade module；
Wherein, the process of the first PI controls is specially：
Respectively the DC voltage of each cascade module is carried out making poor operation with corresponding given module voltage, obtains 3N
First difference result；
The first proportional plus integral control is carried out to 3N obtained the first difference results respectively, obtains 3N first control knot
Fruit；
Symbol decision is carried out to the given expected reactive power of the control system, obtains judging result；
3N first control results are multiplied with the judging result respectively, 3N obtained multiplied result corresponds to respectively
For the amendment phase angle of the 3N cascade modules；
The process of 2nd PI control is specially：
It carries out the single-phase mean direct voltage and given average voltage to make poor operation, obtains the second difference result；
The single-phase mean direct voltage and the given average voltage make, than operation, to obtain ratio result；
Second proportional plus integral control is carried out to the second difference result, obtains the second control result；
By second control result and the ratio results added, obtained summed result is the modulation wave amplitude；
The process of 3rd PI control is specially：
The reactive power and the given expected reactive power are carried out making poor operation, obtain power difference result；
Third proportional plus integral control is carried out to the power difference result, obtained third control result is the phase shifting angle.
2. according to the method described in claim 1, it is characterized in that, described carry out pulsewidth tune to the 3N modulation wave signals
System, the process for obtaining the 3N drive signal for carrying out drive control to the corresponding cascade module are specially：
The 3N modulation wave signals are compared with triangular carrier respectively, the 3N signal relatively obtained after the completion is
Corresponding to the drive signal of each cascade module.
3. a kind of SVG control systems, the SVG includes control system and 3N cascade module, wherein per phase power supply respectively with
N number of cascade module is connected, which is characterized in that including：
Single module DC voltage control module, DC voltage for obtaining each cascade module simultaneously carry out the first PI to it
Control, obtains the corresponding amendment phase angle of each cascade module；
Single-phase mean direct voltage control module, single-phase mean direct voltage for obtaining 3N cascade modules and to it
The 2nd PI controls are carried out, the modulation wave amplitude of the control system is obtained；
Reactive Power Control module, the reactive power for calculating the control system, and the reactive power to obtaining into
Row the 3rd PI controls, obtain the phase shifting angle of the control system；
Phase-locked loop module, three-phase voltage for obtaining the SVG simultaneously control it into horizontal lock, obtain the control system
Locking phase；
Drive signal generation module, for according to the modulation wave amplitude, the phase shifting angle, the locking phase and each institute
It states the corresponding phase angle of correcting of cascade module and obtains 3N modulation wave signal for corresponding to each cascade module；To 3N
The modulation wave signal carries out pulsewidth modulation, obtains the 3N driving for carrying out drive control to the corresponding cascade module
Signal；
Wherein, the single module DC voltage control module includes：
First adder, for respectively making the DC voltage of each cascade module with corresponding given module voltage
Difference operation obtains 3N the first difference results；
First PI controllers are obtained for carrying out the first proportional plus integral control to 3N obtained the first difference results respectively
To 3N the first control results；
Symbol decision unit carries out symbol decision for the given expected reactive power to the control system, obtains judging knot
Fruit；
First multiplier, for 3N first control results to be multiplied with the judging result respectively, 3N obtained phase
Multiply the amendment phase angle that result corresponds to the 3N cascade modules respectively；
The single-phase mean direct voltage control module includes：
Second adder obtains second for carrying out the single-phase mean direct voltage and given average voltage to make poor operation
Difference result；
Second multiplier, for make, than operation, obtaining the single-phase mean direct voltage and the given average voltage
Ratio result；
2nd PI controllers obtain the second control result for carrying out the second proportional plus integral control to the second difference result；
Third adder, for by second control result and the ratio results added, obtained summed result to be institute
State modulation wave amplitude；
Stating Reactive Power Control module includes：
4th adder obtains power for carrying out making poor operation to the reactive power and the given expected reactive power
Difference result；
3rd PI controllers, for carrying out third proportional plus integral control to the power difference result, obtained third control knot
Fruit is the phase shifting angle.
Priority Applications (1)
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
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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 |
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