CN110460099A - PCC voltage transient state compensation feed-forward control method and system for common load common connection point - Google Patents
PCC voltage transient state compensation feed-forward control method and system for common load common connection point Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- 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
Abstract
The disclosure relates to a feedforward control method and system for PCC voltage transient compensation of a common load common connection point. Wherein, the method comprises the following steps: collecting the total current of the public load from the PCC of the public load as a disturbance signal and synchronously transmitting the disturbance signal to each inverter; deriving a transfer function matrix taking the disturbance quantity as input and the residual quantity as output by establishing a state space model and a state observer of a control object, and generating a residual value of the inverter through the transfer function matrix; and taking the residual value as an input signal of a feedforward compensator of the inverter to finish the transient state compensation feedforward control of the common load PCC voltage of the inverter. The present disclosure significantly speeds up the voltage recovery process by fast compensation for disturbances, increasing the robustness of the system.
Description
Technical field
This disclosure relates to field of power electronics, in particular to a kind of common load points of common connection PCC voltage transient
Compensating feedforward control method and system.
Background technique
In recent years, with the development of the new energy such as scene and small size gas turbine technology, micro-capacitance sensor is paid close attention to by all circles.It is micro-
Power grid is that distributed generation resource, energy storage, load, control unit, monitoring and protecting device organic combination together small-sized are transported to electricity
System is the tie that power distribution network and distributed generation resource link together.The operational mode of microgrid have it is grid-connected and two kinds of isolated island, and
When net operation, because bulk power grid has larger capacity and digestion capability, when there is load switching or new energy goes out fluctuation, to microgrid
Voltage does not have larger impact.When microgrid is in isolated operation, because its capacity is relatively small, contribute to load variation or new energy
Unevenness has poor anti-interference effect.There are master & slave control and equity to control the whole control mode of microgrid at present, master & slave control is
Master controller using V/f control and the slave controller using P/Q control, master controller provide the reference of voltage and frequency, from
Controller is responsible for providing the variation that instruction current quickly follows load.This control mode has preferable precision, however to communication
It is more demanding, it is communicating when something goes wrong, system can paralyse.And reciprocity control strategy is the equal of a kind of physical interconnection control
Mode processed, when system loading fluctuation, by the droop control of every sagging control, system can reach a new equalization point,
And equilibrium state can achieve the effect that power-sharing.Every inverter status is identical, does not have master-slave relationship, therefore also be compliant with i.e.
The characteristics of plug-and-play.Because of its preferable control characteristic and lower communication need, equity control has wide in engineering
Using.Route resistance sense ratio can be improved by the way of sagging control plus virtual impedance, the coupling eliminated between active reactive is closed
System, achievees the purpose that multi-inverter power-sharing.It is simply sagging but when load is cut out, or when with nonlinear load
Not the problems such as control not can solve longer voltage recovery time and harmonic wave.It is higher when using micro-capacitance sensor isolated operation mode
New energy permeability will lead to the power qualities such as voltage fluctuation and harmonic wave caused by as loading the randomness contributed with new energy and ask
Topic, or even can also cause microgrid Transient Instability, user and microgrid can be affected greatly.
It should be noted that information is only used for reinforcing the reason to the background of the disclosure disclosed in above-mentioned background technology part
Solution, therefore may include the information not constituted to the prior art known to persons of ordinary skill in the art.
Summary of the invention
The disclosure is designed to provide a kind of common load points of common connection PCC voltage transient compensating feedforward control method
And system, and then one or more is overcome caused by the limitation and defect due to the relevant technologies at least to a certain extent
Problem.
According to one aspect of the disclosure, a kind of common load points of common connection PCC voltage transient compensating feedforward control is provided
Method processed, comprising:
Disturbing signal acquisition step, from the PCC of common load acquisition common load total current as disturbing signal and synchronization
It is transferred to each inverter；
Residual values generation step is exported by establishing the state-space model and state observer of control object to disturb
Amount is input, take residual error amount as the transfer function matrix of output, and generates the inverter by the transfer function matrix
Residual values；
Inverter feedforward control step is completed the residual values as the feed-forward compensator input signal of the inverter
Common load PCC voltage transient compensating feedforward control to the inverter.
In a kind of exemplary embodiment of the disclosure, the disturbing signal acquisition step further include:
It is supervised using points of common connection PCC acquisition common load total current of the synchronous phasor measurement unit to common load
It surveys；
Using GPS sync identification function, it is sent to respectively using common load total current as disturbing signal according to preset ratio
The controller of platform inverter.
In a kind of exemplary embodiment of the disclosure, the residual values generation step further include:
Establish the state-space model and state observer of control object, and by the two simultaneous；
Drawing with disturbance quantity is input, take residual error amount as the state space of output, and is derived there from disturbance to residual error
Transfer function matrix.The disturbing signal of the inverter is obtained to the transmission function of residual values.
In a kind of exemplary embodiment of the disclosure, the method also includes: more inverter parallel models are established, are used
Complex vector XdqIndicate the sum of rotating coordinate system d, q axis component Xd-jXq, the voltage and current differential equation is established to i-th inverter LC
Model:
The differential equation of transmission line of electricity are as follows:
By the circulation I between i-th, j, two invertersijIt is defined as between route caused by two inverter output voltage differences
The variation of electric current, the electric current can also be indicated with the differential equation；
Wherein, ViFor inverter output voltage, IiFor inductive current, IoiFor inverter output current, VpFor load end electricity
Pressure.ViiFor three-phase bridge output voltage, riFor the internal resistance of filter inductance, RoiAnd LoiThe respectively resistance-inductance of transmission line of electricity, LiWith
CiRespectively filter inductance, filter capacitor.ω is d, q rotating coordinate system angular speed.
Work as controllerWhen for stability controller, input u meets:
U (s)=K0(s)e(s)-Q(s)·r
It is solved using the method for Model Matching in robust control, the state-space expression of three-phase LC filter can indicate
Are as follows:
Wherein, subscript d, q is the transformed dq axis component of abc-dq0.
Load current IoIt, will be using residual error as the compensator Q's (s) of input quantity as the disturbance input d for influencing voltage output
Output is added on PI controller output signal, the input as control object；
Residual Generation device is solved according to Model Matching strategy；
According to state-space model export transfer function matrix, must output and input between transmission function Gu(s) it and disturbs
Move the transmission function G between outputd(s):
Observer shown in above formula is established, transfer function matrix is exported in conjunction with shown state-space model, then can be disturbed
Dynamic and residual error relational expression:
Wherein, GrdTo disturb the transmission function for arriving residual error；
By master pattern matching strategy, make to disturb the system (G for inputd+Gu·Q·Grd) output be equal to 0, obtain:
Q (s)=- Gu -1·Gd·Grd -1。
In a kind of exemplary embodiment of the disclosure, the controller method for solving further include:
Gradient descent method optimization based on performance objective function；
Robust Model matching suboptimum based on LMI solves；
Arbitrarily to input, zero output is the Neural Networks Solution of tutor's signal；
Intensified learning based on reward penalty factor solves.
In a kind of exemplary embodiment of the disclosure, the inverter feedforward control step further include:
Total current perturbation is distributed into each disturbance input by preset ratio；
Residual error feedforward controller by input by disturbance generate residual information, by 3/2 inverse transformation to the inverter into
Row feedforward compensation, wherein compensation point is after stability controller, and the stability controller is according to two close cycles and sagging virtual resistance
Anti- mode carries out Front feedback control；
According to the surplus of every inverter, the disturbance is allocated according to residual capacity.
In one aspect of the present disclosure, a kind of common load points of common connection PCC voltage transient compensating feedforward control is provided
System, which is characterized in that the system comprises:
Disturbing signal acquisition module, it is public negative for being acquired by synchronous phasor measuring device PMU from the PCC of common load
Carry total current as disturbing signal simultaneously synchronous transfer to each inverter；
Residual values generation module, for establishing state-space model, and calculate the inversion by design Residual Generation device
The disturbing signal of device and generates by the transmission function residual values of the inverter to the transmission function of residual values；
Inverter feedforward control module, for using the residual values as the feed-forward compensator input signal of the inverter
The common load PCC voltage transient compensating feedforward to the inverter is completed to control.
The disclosure by from the PCC of common load acquire common load total current as disturbing signal simultaneously synchronous transfer to each
Inverter establishes state-space model, and calculate the disturbing signal of the inverter to residual values by designing Residual Generation device
Transmission function, and generate by the transmission function residual values of the inverter；With model matching method to the controller
It solves, the common load to the inverter is completed using the residual values as the feed-forward compensator input signal of the inverter
PCC voltage transient compensating feedforward control.The disclosure is the feedforward control inputted with residual error based on the Residual Generation strategy of observer
Device accelerates the transient response of system, when using voltage as quantity of state, by the quick compensation for disturbance, restores voltage
Process is obviously accelerated, and the robustness of system is increased.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Detailed description of the invention
Its example embodiment is described in detail by referring to accompanying drawing, the above and other feature and advantage of the disclosure will become
It is more obvious.
Fig. 1 is shown to be compensated according to the common load points of common connection PCC voltage transient of one exemplary embodiment of the disclosure
The flow chart of feed forward control method；
Fig. 2 shows the microgrid structure charts according to more inverter parallels of one exemplary embodiment of the disclosure；
Fig. 3 diagrammatically illustrates the disturbing signal decomposition diagram according to one exemplary embodiment of the disclosure；
Fig. 4 diagrammatically illustrates the Residual Generation feedforward control based on observer according to one exemplary embodiment of the disclosure
Structure chart；
Fig. 5 is diagrammatically illustrated given according to the disturbance of one exemplary embodiment of the disclosure and is compensated schematic diagram；
Fig. 6 is shown to be compensated according to the common load points of common connection PCC voltage transient of one exemplary embodiment of the disclosure
Feedforward control system figure.
Specific embodiment
Example embodiment is described more fully with reference to the drawings.However, example embodiment can be real in a variety of forms
It applies, and is not understood as limited to embodiment set forth herein；On the contrary, thesing embodiments are provided so that the disclosure will be comprehensively and complete
It is whole, and the design of example embodiment is comprehensively communicated to those skilled in the art.Identical appended drawing reference indicates in figure
Same or similar part, thus repetition thereof will be omitted.
In addition, described feature, structure or characteristic can be incorporated in one or more implementations in any suitable manner
In example.In the following description, many details are provided to provide and fully understand to embodiment of the disclosure.However,
It will be appreciated by persons skilled in the art that can be with technical solution of the disclosure without one in the specific detail or more
It is more, or can be using other methods, constituent element, material, device, step etc..In other cases, it is not shown in detail or describes
Known features, method, apparatus, realization, material or operation are to avoid fuzzy all aspects of this disclosure.
Block diagram shown in the drawings is only functional entity, not necessarily must be corresponding with physically separate entity.
I.e., it is possible to realize these functional entitys using software form, or these are realized in the module of one or more softwares hardening
A part of functional entity or functional entity, or realized in heterogeneous networks and/or processor device and/or microcontroller device
These functional entitys.
In this exemplary embodiment, a kind of common load points of common connection PCC voltage transient compensating feedforward is provided firstly
Control method, with reference to shown in Fig. 1, which be can wrap
Include following steps:
Disturbing signal acquisition step S110, from the PCC of common load acquisition common load total current as disturbing signal simultaneously
Synchronous transfer is to each inverter；
Residual values generation step S120 establishes state-space model, and calculate the inversion by designing Residual Generation device
The disturbing signal of device and generates by the transmission function residual values of the inverter to the transmission function of residual values；
Inverter feedforward control step S130, using the residual values as the feed-forward compensator input signal of the inverter
The common load PCC voltage transient compensating feedforward to the inverter is completed to control.
The disclosure is public negative from the PCC (Point of Common Coupling, point of common coupling) of common load acquisition
Carry total current as disturbing signal simultaneously synchronous transfer to each inverter；By design Residual Generation device, state-space model is established,
And the disturbing signal of the inverter is calculated to the transmission function of residual values, and the inverter is generated by the transmission function
Residual values；It completes the residual values as the feed-forward compensator input signal of the inverter to the public of the inverter
Load PCC voltage transient compensating feedforward control.The disclosure is the control inputted with residual error based on the Residual Generation strategy of observer
Device accelerates the transient response of system, when using voltage as quantity of state, by the quick compensation for disturbance, restores voltage
Process is obviously accelerated, and the robustness of system is increased.
In disturbing signal acquisition step S110, it can be used as and disturb from the PCC of common load acquisition common load total current
Dynamic signal and synchronous transfer are to each inverter.
In exemplary embodiment of the invention, the disturbing signal acquisition step further include:
It is always electric by using points of common connection PCC acquisition common load of the synchronous phasor measurement unit PMU to common load
Stream is monitored；
Using GPS sync identification function, it is sent to respectively using common load total current as disturbing signal according to preset ratio
The controller of platform inverter.
In residual values generation step S120, by establishing the state-space model and state observer of control object, lead
It is out input with disturbance quantity, take residual error amount as the transfer function matrix of output, and by described in transfer function matrix generation
The residual values of inverter.
In exemplary embodiment of the invention, the residual values generation step includes:
The differential equation under d, q axis, including the LC differential equation, transmission line of electricity differential side are established to multi-inverter parallel topology
Journey and the circulation differential equation；
Separate unit Residual Generation device is designed, the state-space model of separate unit Residual Generation device is established；According to Model Matching strategy
Method solving state spatial model obtains the disturbing signal of the inverter to the transfer function matrix of residual values.
In exemplary embodiment of the invention, the differential equation under d, q axis is established to multi-inverter parallel topology, including
The LC differential equation, the transmission line of electricity differential equation and the circulation differential equation.
It is illustrated in figure 2 the structure chart of more inverter parallels, establishes more inverter parallel models, with complex vector XdqTable
Show the sum of rotating coordinate system d, q axis component Xd-jXq, voltage and current Differential Equation Model is established to i-th inverter LC:
The differential equation of transmission line of electricity are as follows:
The i-th, the circulation I between two inverters of jijThe electric current between route caused by two inverter output voltage differences
Variation；
Wherein, ViFor inverter output voltage, IiFor inductive current, IoiFor inverter output current, VpFor load end electricity
Pressure.ViiFor three-phase bridge output voltage, riFor the internal resistance of filter inductance, RoiAnd LoiThe respectively resistance-inductance of transmission line of electricity, LiWith
CiRespectively filter inductance, filter capacitor.ω is d, q rotating coordinate system angular speed.
In exemplary embodiment of the invention, actual output current is split into two parts, circulation and ideal output electricity
Stream, wherein circulation is the sum of inverter to other inverter loop currents, when desired output current is not in parallel, the ideal of inverter
Export electric current.It is illustrated in figure 3 disturbing signal decomposition diagram, the current disturbing at common load end can assign to each inversion
Device, the actual output current I of First invertero1Red desired output current I can be regarded asd1With it is all by the inverter to
The sum of circulation of other inverters, wherein desired output current is current perturbation.By the circulation differential equation it is found that working as common load
Disturbance is generated, i.e., when common load electric current changes, inverter output current generates variation therewith, and circulation is not by its shadow
It rings, therefore circulation can not be in disturbance limit of consideration, when common load end generates disturbance, the output electric current of every inverter can be with
Variation, but circulation value is constant.Therefore, using the desired output current of separate unit as disturbance input, each inverter output electricity is compensated
The influence being pressed under current perturbation.It designs the feed forward control method based on observer under a kind of separate unit and solves this problem.
In exemplary embodiment of the invention, separate unit Residual Generation device is designed, separate unit state-space model is established and is used in combination
The method of Model Matching solves, the method also includes:
Work as controllerWhen for stability controller, input u meets:
U (s)=K0(s)e(s)-Q(s)·r
It is illustrated in figure 4 the Residual Generation feedforward control structure based on observer, the chart is bright, stablizes in former control system
On the basis of, the feed forward architecture of observer and controller is added, does not change original system stability.Using model in robust control
Matched method solves, and the state-space expression of three-phase LC filter may be expressed as:
Wherein, subscript d, q is the transformed dq axis component of abc-dq0.
In exemplary embodiment of the invention, the method also includes:
Load current IoIt, will be using residual error as the compensator Q's (s) of input quantity as the disturbance input d for influencing voltage output
Output is added on PI controller output signal, the input as control object；
Feedforward controller is solved according to Model Matching strategy；
With controlled device, Residual Generation device, and three transfer function matrix of disturbance to output solve feedforward controller.
According to state-space model export transfer function matrix, must output and input between transmission function Gu(s) it and disturbs
Move the transmission function G between outputd(s):
Observer shown in above formula is established, transfer function matrix is exported in conjunction with shown state-space model, then can be disturbed
Dynamic and residual error relational expression:
Wherein, GrdTo disturb the transmission function for arriving residual error；
By master pattern matching strategy, make to disturb the system (G for inputd+Gu·Q·Grd) output be equal to 0, obtain:
Q (s)=- Gu -1·Gd·Grd -1。
In exemplary embodiment of the invention, the controller method for solving further include:
Gradient descent method optimization based on performance objective function；
Robust Model matching suboptimum based on LMI solves；
Arbitrarily to input, zero output is the Neural Networks Solution of tutor's signal；
Intensified learning based on reward penalty factor solves.
It, can be using the residual values as the feed-forward compensator of the inverter in inverter feedforward control step S130
Input signal is completed the common load PCC voltage transient compensating feedforward to the inverter and is controlled.
In exemplary embodiment of the invention, the inverter feedforward control step further include:
Total current perturbation is distributed into each disturbance input by preset ratio；
The residual information that Residual Generation device is generated by input by disturbance, before being carried out by 3/2 inverse transformation to the inverter
Feedback compensation, wherein compensation point is after stability controller, and the stability controller is according to two close cycles and sagging virtual impedance
Mode carries out Front feedback control；
According to the surplus of every inverter, the disturbance is allocated according to residual capacity.It can not only solve in this way
The problems such as certainly end PCC voltage problem, the overload that can also prevent inverter from generating by compensation.
In exemplary embodiment of the invention, total current is taken from common load with PMU, each inverter is assigned to and makees
Disturbance is given, reaches the common inhibition to PCC point voltage, is illustrated in figure 5 disturbance and gives and compensate schematic diagram, by the residual error
Controller in every inverter for being added residual error observer and feed-forward compensator in the microgrid of multi-inverter parallel.Simultaneously
In the case of connection, it may appear that circulation phenomenon shown in Fig. 3.Since the feed-forward compensator is voltage compensation, in the compensation process
Contravarianter voltage not etc. can not generate new circulation.To avoid this circulation to influence caused by compensator disturbance acquisition, use
Synchronous phasor measurement unit makees real-time monitoring to common load electric current, using GPS sync identification function, by the disturbance of common load
The controller disturbance that electric current is directly given to each inverter simultaneously by a certain percentage is given, to pass through compensation inverter output point
Voltage guarantees PCC point voltage stabilization.And The method avoids the transient state circulation generated in compensation process to disturbance value
It influences.
In exemplary embodiment of the invention, the disclosure compensates PCC point voltage, feedovers due to being added, and accelerates PCC
Recovery process of the voltage due to cutting the factors such as load improves the performance of noiseproof of system, while in view of compensation process believes disturbance
The further influence of breath is assigned in each inverter and compensates jointly by the way of taking current perturbation from common load.Using same
Phasor measurement system is walked, disturbance information can be made while being reached, to avoid excessively complicated transient state effect.According to residual capacity
The problems such as distribution can prevent inverter running overload, each inverter compensates jointly makes PCC point voltage stabilization.This public affairs
The feedforward compensation method opened can accelerate PCC point voltage fluctuation resume speed, and system vulnerability to jamming is made to get a promotion.It is inverse using every
The residual capacity for becoming device compensates, and allows to mutually compensate disturbance with the capacity of inverter, reaches the effect inhibited jointly
Fruit.When load switching, mutually power convergence speed is faster than before.
It should be noted that although describing each step of method in the disclosure in the accompanying drawings with particular order,
This does not require that or implies must execute these steps in this particular order, or have to carry out step shown in whole
Just it is able to achieve desired result.Additional or alternative, it is convenient to omit multiple steps are merged into a step and held by certain steps
Row, and/or a step is decomposed into execution of multiple steps etc..
In addition, in this exemplary embodiment, before additionally providing a kind of common load points of common connection PCC voltage transient compensation
Present control system.Referring to shown in Fig. 6, which be can wrap
Include disturbing signal acquisition module 601, residual values generation module 602 and inverter feedforward control module 603, in which:
Disturbing signal acquisition module 601, it is public for being acquired by synchronous phasor measuring device PMU from the PCC of common load
Altogether load total current as disturbing signal simultaneously synchronous transfer to each inverter；
Residual values generation module 602, for establishing state-space model by design Residual Generation device, and described in calculating
The disturbing signal of inverter and generates by the transmission function residual values of the inverter to the transmission function of residual values；
Inverter feedforward control module 603, for being inputted the residual values as the feed-forward compensator of the inverter
Signal is completed the common load PCC voltage transient compensating feedforward to the inverter and is controlled.
The detail of each common load points of common connection PCC voltage transient compensating feedforward control system module has been among the above
Through being described in detail in corresponding common load points of common connection PCC voltage transient compensating feedforward control method, because
Details are not described herein again for this.
It should be noted that although being referred to the compensation of common load points of common connection PCC voltage transient in the above detailed description
Several modules or unit of feedforward control system, but this division is not enforceable.In fact, according to the reality of the disclosure
Apply mode, the feature and function of two or more above-described modules or unit can have in a module or unit
Body.Conversely, an above-described module or the feature and function of unit can be with further division by multiple modules or
Person unit embodies.
In addition, in an exemplary embodiment of the disclosure, additionally providing a kind of electronic equipment that can be realized the above method.
Person of ordinary skill in the field it is understood that various aspects of the invention can be implemented as system, method or
Program product.Therefore, various aspects of the invention can be embodied in the following forms, it may be assumed that complete hardware embodiment, completely
Software implementation (including firmware, microcode etc.) or hardware and software in terms of combine embodiment, may be collectively referred to as here
Circuit, " module " or " system ".
By the description of above embodiment, those skilled in the art is it can be readily appreciated that example embodiment described herein
It can also be realized in such a way that software is in conjunction with necessary hardware by software realization.Therefore, implemented according to the disclosure
The technical solution of example can be embodied in the form of software products, which can store in a non-volatile memories
In medium (can be CD-ROM, USB flash disk, mobile hard disk etc.) or on network, including some instructions are so that a calculating equipment (can
To be personal computer, server, terminal installation or network equipment etc.) it executes according to the method for the embodiment of the present disclosure.
In addition, above-mentioned attached drawing is only the schematic theory of processing included by method according to an exemplary embodiment of the present invention
It is bright, rather than limit purpose.It can be readily appreciated that the time that above-mentioned processing shown in the drawings did not indicated or limited these processing is suitable
Sequence.In addition, be also easy to understand, these processing, which can be, for example either synchronously or asynchronously to be executed in multiple modules.
Those skilled in the art after considering the specification and implementing the invention disclosed here, will readily occur to its of the disclosure
His embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Adaptive change follow the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure or
Conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by claim
It points out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the attached claims.
Claims (8)
1. a kind of common load points of common connection PCC voltage transient compensating feedforward control method, which is characterized in that the method packet
It includes:
Disturbing signal acquisition step, from the PCC of common load acquisition common load total current as disturbing signal and synchronous transfer
To each inverter；
Residual values generation step, by establishing the state-space model and state observer of control object, export is with disturbance quantity
Input take residual error amount as the transfer function matrix of output, and the residual error of the inverter is generated by the transfer function matrix
Value；
Inverter feedforward control step is completed the residual values as the feed-forward compensator input signal of the inverter to institute
State the common load PCC voltage transient compensating feedforward control of inverter.
2. the method as described in claim 1, which is characterized in that the disturbing signal acquisition step further include:
It is monitored using points of common connection PCC acquisition common load total current of the synchronous phasor measurement unit to common load；
Using global position system GPS sync identification function, using common load total current as disturbing signal according to preset ratio
It is sent to the controller of each inverter.
3. the method as described in claim 1, which is characterized in that the residual values generation step further include:
Establish the state-space model and state observer of control object, and by the two simultaneous；
It is input with disturbance quantity, take residual error amount as the state space of output, and is derived there the transmission function from disturbance to residual error
Matrix.
4. the method as described in claim 1, which is characterized in that the method also includes:
More inverter parallel models are established, with complex vector XdqIndicate the sum of rotating coordinate system d, q axis component Xd-jXq, to i-th
Inverter LC establishes voltage and current Differential Equation Model:
The differential equation of transmission line of electricity are as follows:
Define the circulation I between i-th, two inverters of jijThe electric current between route caused by two inverter output voltage differences
Changing value, the variation can be indicated by the differential equation:
Wherein, ViFor inverter output voltage, IiFor inductive current, IoiFor inverter output current, VpFor load terminal voltage.Vii
For three-phase bridge output voltage, riFor the internal resistance of filter inductance, RoiAnd LoiThe resistance electricity of respectively i-th inverter transmission line of electricity
Sense, LiAnd CiRespectively filter inductance, filter capacitor.ω is d, q rotating coordinate system angular speed.
5. the method as described in claim 1, which is characterized in that the controller solution procedure further include:
Stability explanation:
Work as controllerWhen for stability controller, when the input u of controlled device meets following formula, the feedforward control
Device processed is stability controller:
U (s)=K0(s)e(s)-Q(s)·r
Model Matching solves:
Load current IoIt, will be folded by the output of the compensator Q (s) of input quantity of residual error as the disturbance input d for influencing voltage output
It is added on PI controller output signal, the input as control object；
Feedforward controller is solved according to Model Matching strategy；
According to state-space model export transfer function matrix, must output and input between transmission function Gu(s) it and disturbs to defeated
Transmission function G between outd(s):
Establish observer shown in above formula, in conjunction with shown state-space model export transfer function matrix, then can obtain disturbance and
The relational expression of residual error:
Wherein, GrdTo disturb the transmission function for arriving residual error；
By master pattern matching strategy, make to disturb the system (G for inputd+Gu·Q·Grd) output be equal to 0, obtain:
Q (s)=- Gu -1·Gd·Grd -1。
6. method as claimed in claim 5, which is characterized in that the controller method for solving further include:
Gradient descent method optimization based on performance objective function；
Robust Model matching suboptimum based on LMI solves；
Arbitrarily to input, zero output is the Neural Networks Solution of tutor's signal；
Intensified learning based on reward penalty factor solves.
7. the method as described in claim 1, which is characterized in that the inverter feedforward control step further include:
Total current perturbation is distributed into each disturbance input by preset ratio；
The residual information that Residual Generation device is generated by input by disturbance, carries out feedforward benefit to the inverter by 3/2 inverse transformation
It repays, wherein compensation point is after stability controller, and the stability controller is according to the modes of two close cycles and sagging virtual impedance
Carry out Front feedback control；
According to the surplus of every inverter, the disturbance is allocated according to residual capacity.
8. a kind of parallel connection type active electric filter Harmonics amplification effect inhibits system, which is characterized in that the system comprises:
Disturbing signal acquisition module, for acquiring common load total current as disturbing signal and synchronization from the PCC of common load
It is transferred to each inverter；
Residual values generation module, for establishing the state-space model and state observer of control object, export is with disturbance quantity
Input take residual error amount as the transfer function matrix of output, and the residual error of the inverter is generated by the transfer function matrix
Value；
Inverter feedforward control module, for being completed the residual values as the feed-forward compensator input signal of the inverter
Common load PCC voltage transient compensating feedforward control to the inverter.
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