CN109149660A - A kind of powerless control method and system for photovoltaic generating system - Google Patents
A kind of powerless control method and system for photovoltaic generating system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
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Abstract
The present invention relates to a kind of powerless control method and system for photovoltaic generating system, the idle control model including the photovoltaic power generation system model based on setting obtains photovoltaic generating system and is in the reference value signal under the idle control model；According to reference value signal, the output of current transformer is controlled；Wherein, the idle control model includes: voltage mode control, Reactive Power Control mode and reactive voltage coordinated control mode.Photovoltaic generating system is made to can adapt to power grid difference Reactive-power control demand through the above scheme.
Description
Technical field
The present invention relates to technical field of new energy power generation, and in particular to a kind of idle controlling party for photovoltaic generating system
Method and system.
Background technique
With the appearance for the problems such as environmental pollution, fossil energy are increasingly exhausted and the energy safety of supply, renewable energy
It develops and using increasingly by the concern of international community.Solar energy is a kind of reproducible clean energy resource, and photovoltaic power generation is it
Mainly utilize form.Compared with conventional electric power generation technology, photovoltaic power generation has many advantages, such as that the energy is sustainable, safety and environmental protection, in recent years
It is developed rapidly.
Photovoltaic system is connected to the grid, and when the capacity of itself is smaller relative to power grid, the disturbance of power is to power grid security
Stabilizing influence can be ignored, and as the power grid permeability of photovoltaic power generation constantly increases, influence of the photovoltaic power generation to power grid is gradually shown
Existing, photovoltaic power generation can also bring the harm of safety while providing functional amount to power grid.Simultaneously with parallel network power generation
The continuous improvement of network capacity amount, this problem will be increasingly prominent.
To guarantee power network safety operation, photovoltaic access is reduced to the adverse effect of power grid, China has formulated a series of
Standard criterion photovoltaic power generation grid-connecting service requirement, is concentrated mainly on the following aspects: (1) active power independent control has
Frequency modulation characteristic.Grid-connected little to electric network influencing when photovoltaic permeability is smaller, photovoltaic power generation focuses mostly in how improving hair
The research of electrical efficiency, i.e. maximum power tracing technology；It is grid-connected to power grid frequency modulation, peak regulation when photovoltaic permeability is larger
Influence gradually shows, thus, large-sized photovoltaic electricity generation system should have the independent control ability of active power.(2) reactive power is only
Vertical control, has voltage adjustment characteristic.Photo-voltaic power supply access changes grid power distribution, may cause grid-connected voltage it is out-of-limit, fluctuation,
Photo-voltaic power supply necessarily participates in system pressure regulating control, provides urgent reactive power support to power grid when necessary.(3) isolated island is protected, and photovoltaic is simultaneously
Serious consequence will be generated to user, service personnel, power equipment etc. when net electricity generation system is in island operation state, study isolated island
Detection method and safeguard measure minimize the harm that isolated island generates with highly important realization meaning.(4) low-voltage is worn
More, low voltage ride-through capability is the powerful support that photovoltaic generating system restores electric network fault.(5) electricity grid oscillating inhibits,
Electricity grid oscillating frequency is low, and the period is long, involves wide, brings very big harm to electric system, each area's low frequency vibration of interconnected network
It swings and easily leads to the movement of interconnection protective device, cause network off-the-line, low frequency increasing oscillation results even in whole system collapse, with
The concentration in large-sized photovoltaic power station be incorporated into the power networks, grid-connected photovoltaic system should have the function of participating in inhibiting electricity grid oscillating.(6)
Photovoltaic plant is adjusted as a whole, large-sized photovoltaic power station inverter parallel, influences each other between inverter, and due to
The presence of electric network impedance intercouples between inverter, when an inverter breaks down, easily influences the steady of other inverters
Fixed operation.(7) efficient conversion, there is preferable power quality to inject, inverter efficiency be photovoltaic generating system important indicator it
One, since single photovoltaic generating system power is smaller, large-sized photovoltaic power station is made of a large amount of photovoltaic generating systems, research photovoltaic hair
Electric system clustered control technology makes each generator unit in power station worked as far as possible in efficient operation point by reasonable control strategy.
Power quality problem is long-standing, runs for large-sized photovoltaic electric station grid connection, should preferably inhibit electricity when low frequency, weak grid
The power quality problems such as superposition, direct current injection of current harmonics when flowing harmonic wave and more inverters grid-connected simultaneously.
Summary of the invention
In order to solve the deficiencies in the prior art, the present invention provide a kind of powerless control method for photovoltaic generating system and
System, using the method that idle control flag bit is arranged, by the way that the different Numerical Implementations idle function of photovoltaic generating system is arranged
The unitized model of rate control, voltage control and reactive voltage coordinated control Three models accesses electric power for extensive new energy
The reactive voltage analysis of system provides the foundation.
In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical scheme that:
A kind of powerless control method for photovoltaic generating system, which comprises
The idle control model of photovoltaic power generation system model based on setting obtains photovoltaic generating system and is in described idle
Reference value signal under control model；
According to the reference value signal, the output of current transformer is controlled；
Wherein, the idle control model includes: voltage mode control, and Reactive Power Control mode and reactive voltage are coordinated
Control model.
Preferably, the setting of the idle control model of the photovoltaic power generation system model includes:
The control instruction for receiving photovoltaic generating system, determines photovoltaic power generation system model based on the control instruction content
Idle control model；
According to the value of the idle control model dirty bit of the photovoltaic power generation system model；
Wherein, the flag bit includes voltage flag position Vflag and idle flag bit Qflag.
Further, the value of the idle control model dirty bit according to photovoltaic power generation system model includes:
When voltage flag position Vflag is 0, and idle flag bit Qflag is 1, the idle control model is voltage control
Mode；
When voltage flag position Vflag is 0 or 1, and idle flag bit Qflag is 0, the idle control model is idle
Power control mode；
When voltage flag position Vflag is 1, and idle flag bit Qflag is 1, the idle control model is reactive voltage
Coordinated control mode.
Preferably, the reference value signal that is under idle control model of photovoltaic generating system that obtains includes:
When photovoltaic generating system is under voltage mode control, by set end voltage measured value and Voltage Reference predetermined
The deviation of value inputs PI controller, exports the first reactive current reference value signal of photovoltaic generating system, and limit described first
Reactive current reference value signal is in [Iqmin,Iqmax] the first reactive current reference value signal in range, after obtaining clipping, wherein
IqminLower current limit, I are exported for PI controllerqmaxUpper current limit is exported for PI controller；
When photovoltaic generating system is under Reactive Power Control mode, set end voltage measured value and nothing predetermined are inputted
Function value and power reference carries out delay process through time delay process, exports the second reactive current reference value signal of photovoltaic generating system；
When photovoltaic generating system is under reactive voltage coordinated control mode, by reactive power reference qref predetermined and
The proportionality coefficient of PI controller and differential coefficient input PI controller, output voltage reference value signal under voltage mode control；And
The Voltage Reference value signal is limited in [Vmin,Vmax] Voltage Reference value signal in range, after obtaining clipping, wherein VminFor
PI controller output voltage lower limit, VmaxFor PI controller output voltage limit；Described in after set end voltage measured value and clipping
The deviation of Voltage Reference value signal inputs PI controller, exports the third reactive current reference value signal of photovoltaic generating system.
Further, the first reactive current reference value signal of photovoltaic generating system is determined by following formula:
In formula, VmeasFor set end voltage measured value, VrefFor set end voltage reference value predetermined, IqcmdIt is idle for first
Current reference value signal, KvpAnd KviThe proportionality coefficient and differential coefficient of PI controller under voltage mode control are respectively indicated, S is
Transmission function.
Further, the second reactive current reference value signal of photovoltaic generating system is determined by following formula:
In formula, TiqFor the delay time constant of time delay process, QrefFor reactive power reference qref predetermined, VmeasFor
Set end voltage measured value, I'qcmdFor the second reactive current reference value signal, S is transmission function.
Further, the third reactive current reference value signal of photovoltaic generating system is determined by following formula:
In formula, I "qcmdFor third reactive current reference value signal, KqpAnd KqiFor PI device under reactive voltage coordinated control mode
Proportionality coefficient and differential coefficient；KvpAnd KviFor the proportionality coefficient and differential coefficient of PI controller under voltage mode control, Qmeas
For generator terminal wattless power measurement value, QcmdFor reactive power reference qref predetermined, VcmdFor voltage reference value, VmeasFor generator terminal
Voltage measuring value, S are transmission function.
Preferably, described according to reference value signal, the output for controlling current transformer includes:
Based on the type of idle control model, by the generator terminal measured value of the photovoltaic generating system under the idle control model
Input with reference value as current transformer；
Using the current reference value signal under corresponding idle control model as the control parameter of current transformer；
Based in limits predetermined, the control parameter of current transformer is adjusted by ratio resonant regulator, with
Change the output of current transformer.
A kind of powerless control system for photovoltaic generating system characterized by comprising
Module is obtained, for the idle control model of the photovoltaic power generation system model based on setting, obtains photovoltaic power generation system
Reference value signal of the system under the idle control model；
Control module, for controlling the output of current transformer according to the reference value signal.
Preferably, the acquisition module includes:
Receiving unit determines photovoltaic based on the control instruction content for receiving the control instruction of photovoltaic generating system
The idle control model of power system model；
Converting unit, for the value according to the idle control model dirty bit of the photovoltaic power generation system model.
Further, the converting unit includes:
First setting subelement is 0 for working as voltage flag position Vflag, described idle when idle flag bit Qflag is 1
Control model is voltage mode control；
Second setting subelement is 0 or 1 for working as voltage flag position Vflag, when idle flag bit Qflag is 0, institute
Stating idle control model is Reactive Power Control mode；
Third sets subelement, is 1 for working as voltage flag position Vflag, described idle when idle flag bit Qflag is 1
Control model is reactive voltage coordinated control mode.
Preferably, the acquisition module further include:
First acquisition unit, for be under voltage mode control when photovoltaic generating system, by set end voltage measured value and
The deviation of voltage reference value predetermined inputs PI controller, exports the first reactive current reference value letter of photovoltaic generating system
Number, and the first reactive current reference value signal is limited in [Iqmin,Iqmax] the first idle electricity in range, after obtaining clipping
Flow reference value signal, wherein IqminLower current limit, I are exported for PI controllerqmaxUpper current limit is exported for PI controller；
Second acquisition unit, for being under Reactive Power Control mode when photovoltaic generating system, input set end voltage is surveyed
Magnitude and reactive power reference qref predetermined carry out delay process through time delay process, export the second of photovoltaic generating system
Reactive current reference value signal；
Third acquiring unit will be pre-defined for being under reactive voltage coordinated control mode when photovoltaic generating system
Reactive power reference qref and voltage mode control under PI controller proportionality coefficient and differential coefficient input PI controller, output
Voltage Reference value signal；And the Voltage Reference value signal is limited in [Vmin,Vmax] Voltage Reference in range, after obtaining clipping
Value signal, wherein VminFor PI controller output voltage lower limit, VmaxFor PI controller output voltage limit；Set end voltage is surveyed
The deviation of the Voltage Reference value signal after magnitude and clipping inputs PI controller, and the third for exporting photovoltaic generating system is idle
Current reference value signal.
Further, the first acquisition unit includes: the first determining subelement, for determining photovoltaic power generation by following formula
First reactive current reference value signal of system:
In formula, VmeasFor set end voltage measured value, VrefFor set end voltage reference value predetermined, IqcmdIt is idle for first
Current reference value signal, KvpAnd KviThe proportionality coefficient and differential coefficient of PI controller under voltage mode control are respectively indicated, S is
Transmission function.
Further, the second acquisition unit includes: the second determining subelement, for determining photovoltaic power generation by following formula
Second reactive current reference value signal of system:
In formula, TiqFor the delay time constant of time delay process, QrefFor reactive power reference qref predetermined, VmeasFor
Set end voltage measured value, I'qcmdFor the second reactive current reference value signal, S is transmission function.
Further, the third acquiring unit includes: that third determines subelement, for determining photovoltaic power generation by following formula
The third reactive current reference value signal of system:
In formula, I "qcmdFor third reactive current reference value signal, KqpAnd KqiFor PI device under reactive voltage coordinated control mode
Proportionality coefficient and differential coefficient；KvpAnd KviFor the proportionality coefficient and differential coefficient of PI controller under voltage mode control, Qmeas
For generator terminal wattless power measurement value, QcmdFor reactive power reference qref predetermined, VcmdFor voltage reference value, VmeasFor generator terminal
Voltage measuring value, S are transmission function.
Preferably, the control module includes:
Processing unit, for the type based on idle control model, by the photovoltaic power generation system under the idle control model
The generator terminal measured value of system and input of the reference value as current transformer；Current reference value signal under corresponding idle control model is made
For the control parameter of current transformer；
Tracking adjusts unit, for being adjusted and being become by ratio resonant regulator based in limits predetermined
The control parameter of device is flowed, to change the output of current transformer.
Compared with the immediate prior art, the invention has the benefit that
A kind of powerless control method and system for photovoltaic generating system proposed by the present invention, is primarily based on the light of setting
The idle control model of photovoltaic generating system model obtains photovoltaic generating system and is in the letter of the reference value under the idle control model
Number；Wherein, idle control model includes: voltage mode control, Reactive Power Control mode and reactive voltage coordinated control mode.
Secondly according to reference value signal, the output of current transformer is controlled.The different idle control models of setting being capable of accurate response
The photovoltaic generating system powerless control system operation state of different type, different capabilities, model it is adaptable.It effectively reduces
The modeling work amount for control that photovoltaic generating system is idle, realizes the Unified Model of different control models.Comprising above without power control
The photovoltaic power generation system model structure of molding formula easily extends to the grid-connected powerless control system of the renewable energy such as wind power control system,
Have good versatility, has a extensive future.
Detailed description of the invention
Fig. 1 is the powerless control method flow chart for photovoltaic generating system provided in the embodiment of the present invention；
Fig. 2 is the photovoltaic power generation system model structure provided in the embodiment of the present invention；
Fig. 3 is the photovoltaic power generation system model structure chart suitable for electromechanical transient simulation provided in the embodiment of the present invention；
Fig. 4 is the photovoltaic power generation realized based on DIgSILENT PowerFactory platform provided in the embodiment of the present invention
System model；
Fig. 5 is the simulation example photovoltaic generating system access electric network model provided in the embodiment of the present invention；
Fig. 6 is that the simulation example provided in the embodiment of the present invention changes in the case where photovoltaic generating system is using voltage mode control
Photovoltaic generating system voltage measuring value and voltage instruction value correlation curve when voltage reference value instructs, wherein (a) is Voltage Reference
Value (b) compares for photovoltaic generating system reactive power operation curve (c) voltage reference value and voltage measuring value.
Fig. 7 is the simulation example that provides in the embodiment of the present invention in the case where photovoltaic generating system is using Reactive Power Control mode
Photovoltaic generating system wattless power measurement value and voltage instruction value correlation curve when changing reactive power reference qref instruction；
Fig. 8 is that the simulation example provided in the embodiment of the present invention uses reactive voltage coordinated control mould in photovoltaic generating system
Photovoltaic generating system wattless power measurement value and voltage instruction value correlation curve when changing reactive power reference qref instruction under formula,
In (a) reactive power reference qref and measured value, (b) reactive voltage coordinated control mode and Reactive Power Control mode voltage reference
Value is compared with voltage measuring value
Specific embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings.
It is adversely affected to solve photovoltaic system to power grid bring, the accurate friendship for analyzing photovoltaic access to System Reactive Power voltage
Mutually influence.Firstly the need of accurate photovoltaic power generation system model is established, meet the different idle demands for control of power grid, for further hair
Photovoltaic generating system own reactive rapid adjustability is waved, support system voltage stabilization provides model basis.
In order to realize that the demand, the present invention propose a kind of powerless control method and system for photovoltaic generating system.
One, it is theed improvement is that:
(1) it is the multi-control modes for adapting to photovoltaic generating system, provides a kind of predetermined, with common version
Photovoltaic power generation system model, concrete model are realized as shown in Fig. 2, voltage control, Reactive Power Control and idle can be achieved at the same time
The different idle control models of voltage coordinated control, different idle control models are arranged and combine can be real by flag bit difference
Existing, for system structure as shown in figure 3, as seen from the figure, flag bit includes voltage flag position (Vflag) and idle flag bit (Qflag),
The setting of different idle control model flag bits is as shown in the table.
The setting of 1 flag bit of table and idle control model
(2) photovoltaic generating system voltage control refers to photovoltaic generating system by adjusting the Reactive Power Control of generator unit
Photovoltaic generating system set end voltage meets voltage setting value requirement, when photovoltaic generating system is controlled using voltage, input reference
Signal SrefFor Voltage Reference value signal, it is denoted as Vref, it is implemented as follows: by current set end voltage measured value VmeasWith generator terminal
Voltage setting value VrefDeviation through voltage deviation PI controlling unit calculate obtain photovoltaic generating system reactive current reference value
Iqcmd, as shown in Fig. 2, being implemented as follows:
In formula: KvpAnd KviFor the proportionality coefficient and differential coefficient of voltage deviation PI link.
To make reactive current reference value signal meet photovoltaic generating system normal current range of operation, PI controlling unit is increased
If amplitude limit link, reactive current reference value signal is limited in [Iqmin,Iqmax] in section, usual IqminIt is set as -1, IqmaxIf
It is set to 1.
(3) photovoltaic generating system Reactive Power Control refer to photovoltaic generating system according to idle control instruction regulating system without
Function output, when photovoltaic generating system uses Reactive Power Control mode, input reference signal S under the control modelrefIt is idle
Value and power reference is denoted as Qref.Reactive Power Control is implemented as follows: according to current reactive power setting value QrefDivided by machine
Hold voltage measuring value VmeasAnd the reactive current reference value I of photovoltaic generating system is obtained by a time delay processqcmd, specific implementation
It is as follows:
In formula: TiqFor the delay time constant of time delay process.
Delay time constant TiqFor reacting the idle control response delay of photovoltaic generating system, due to converter control system
Fast response time, usual TiqTypical value can be 0.01~0.02s.In addition, to avoid photovoltaic power generation generator terminal brownout from making
Excessively high with reference to calculated value at reactive current, the minimum value of setting set end voltage measured value signal is 0.01pu.
(4) coordinated control of photo-voltaic power generation station reactive voltage refers to that photovoltaic generating system controls reactive power reference signal through PI
The Voltage Reference value signal V obtained after system processedcmd, enter control identical with voltage control system after obtaining voltage reference value
Process finally realizes to photovoltaic generating system reactive voltage coordinated control, input reference signal S under the control modelrefIt is idle
Value and power reference is denoted as Qref.Reactive voltage coordinated control is implemented as follows:
In formula: KqpAnd KqiFor the proportionality coefficient and differential coefficient of idle deviation PI link；KvpAnd KviFor voltage deviation PI ring
The proportionality coefficient and differential coefficient of section.
For the Voltage Reference value signal V for obtaining PI control systemcmdIn the normal working voltage range of photovoltaic generating system
It is interior, thus it is additionally arranged amplitude limit link in Voltage Reference value signal PI controlling unit, Voltage Reference value signal is limited in [Vmin,Vmax]
In section, usual VminIt is set as 0.85~0.95, VmaxIt is set as 0.95~1.05.
Two, for the powerless control method of photovoltaic generating system, specific step is as follows: as shown in Figure 1.
The idle control model of photovoltaic power generation system model of the S1 based on setting obtains photovoltaic generating system and is in the nothing
Reference value signal under function control model；
S2 controls the output of current transformer according to the reference value signal.
Wherein, the idle control model includes: voltage mode control, and Reactive Power Control mode and reactive voltage are coordinated
Control model.The voltage control of photovoltaic generating system refers to photovoltaic generating system by adjusting the Reactive Power Control of generator unit
Photovoltaic generating system set end voltage, to meet voltage setting value requirement.
The Reactive Power Control of photovoltaic generating system refers to photovoltaic generating system by adjusting the reactive power of electricity generation system
Output, to meet idle setting value requirement.
Photovoltaic generating system reactive power/voltage control refers to that photovoltaic generating system is defeated by adjusting the reactive power of electricity generation system
Meet reactive voltage curve (VQ curve) requirement out.
The idle control model of step S1, the photovoltaic power generation system model of setting includes:
The setting of step S1, the idle control model of photovoltaic power generation system model includes:
A, the control instruction for receiving photovoltaic generating system, determines photovoltaic power generation system model based on the control instruction content
Idle control model；
B, according to the value of the idle control model dirty bit of the photovoltaic power generation system model；By changing flag bit
Value convert idle control model so that the control of idle control model and photovoltaic generating system that photovoltaic power generation system model executes
Command content processed is consistent.
Wherein, the flag bit includes voltage flag position Vflag and idle flag bit Qflag.
In step b, the value according to the idle control model dirty bit of photovoltaic power generation system model includes:
When voltage flag position Vflag is 0, and idle flag bit Qflag is 1, the idle control model is voltage control
Mode；
When voltage flag position Vflag is 0 or 1, and idle flag bit Qflag is 0, the idle control model is idle
Power control mode；
When voltage flag position Vflag is 1, and idle flag bit Qflag is 1, the idle control model is reactive voltage
Coordinated control mode.
The reference value signal that photovoltaic generating system is under the idle control model is obtained in step S1 includes:
A, when photovoltaic generating system is under voltage mode control, by set end voltage measured value and voltage predetermined ginseng
The deviation input PI controller for examining value, exports the first reactive current reference value signal of photovoltaic generating system, and control to the PI
The output of device processed carries out clipping, limits the first reactive current reference value signal in [Iqmin,Iqmax] in range, obtain clipping
The first reactive current reference value signal afterwards；
First reactive current reference value signal of photovoltaic generating system is determined by following formula:
In formula, VmeasFor set end voltage measured value, VrefFor set end voltage reference value predetermined, IqcmdIt is idle for first
Current reference value signal, KvpAnd KviRespectively indicate the proportionality coefficient and differential coefficient of PI controller under voltage mode control.
B inputs set end voltage measured value and predetermined when photovoltaic generating system is under Reactive Power Control mode
Reactive power reference qref carries out delay process through time delay process, exports the second reactive current reference value letter of photovoltaic generating system
Number；
Second reactive current reference value signal of photovoltaic generating system is determined by following formula:
In formula, TiqFor the delay time constant of time delay process, QrefFor reactive power reference qref predetermined, VmeasFor
Set end voltage measured value, I'qcmdFor the second reactive current reference value signal.
C, when photovoltaic generating system is under reactive voltage coordinated control mode, by reactive power reference qref predetermined
PI controller, output voltage reference value signal are inputted with the proportionality coefficient of PI controller under voltage mode control and differential coefficient；
And clipping is carried out to the Voltage Reference value signal of PI controller output, the Voltage Reference value signal is limited in [Vmin,
Vmax] Voltage Reference value signal in range, after obtaining clipping, wherein VminFor PI controller output voltage lower limit, VmaxFor PI
Controller output voltage limit；
The deviation of the Voltage Reference value signal after set end voltage measured value and clipping is inputted into PI controller, output light
The third reactive current reference value signal of photovoltaic generating system.
The third reactive current reference value signal of photovoltaic generating system is determined by following formula:
In formula, I "qcmdFor third reactive current reference value signal, KqpAnd KqiFor PI device under reactive voltage coordinated control mode
Proportionality coefficient and differential coefficient；KvpAnd KviFor the proportionality coefficient and differential coefficient of PI controller under voltage mode control, Qmeas
For generator terminal wattless power measurement value, QcmdFor reactive power reference qref predetermined, VcmdFor voltage reference value, VmeasFor generator terminal
Voltage measuring value.
According to reference value signal, the output for controlling current transformer includes: step S2
Based on the type of idle control model, by the generator terminal measured value of the photovoltaic generating system under the idle control model
Input with reference value as current transformer；
Using the current reference value signal under corresponding idle control model as the control parameter of current transformer；
Based in limits predetermined, the control parameter of current transformer is adjusted by ratio resonant regulator, with
Change the output of current transformer.
Embodiment:
It, can be real by the combination of flag bit difference setting value provided with two idle control flag bit Vflag and Qflag
It now include Reactive Power Control, voltage control, three kinds of reactive voltage coordinated control different control models, unlike signal position value pair
Answer control model as shown in the table.
The setting of 1 flag bit of table and idle control model
| Control model | Vflag | Qflag |
| Reactive Power Control | 0 or 1 | 0 |
| Voltage control | 0 | 1 |
| Reactive voltage coordinated control | 1 | 1 |
(1) Reactive Power Control mode: photovoltaic generating system is according to the reactive power reference qref Q receivedrefAdjustment system
Reactive power is exported to reference value.
(2) voltage mode control: photovoltaic generating system adjusts System Reactive Power function according to the Voltage Reference value signal received
Rate adjusts electricity generation system end voltage to Voltage Reference value signal.
(3) reactive voltage coordinated control: photovoltaic generating system is according to the reactive power Q receivedrefReference value signal passes through
PI control system generates voltage reference signal, and then forms idle electricity according to the Voltage Reference value signal and virtual voltage measured value
Closed-loop control system is pressed, eventually by the reactive power of control photovoltaic generating system to reactive power reference qref Qref。
Specifically, each idle control model is implemented as follows:
Voltage mode control: pass through current set end voltage measured value VmeasWith set end voltage setting value VrefDeviation through electricity
Deviation PI controlling unit is pressed to calculate the reactive current reference value I for obtaining photovoltaic generating systemqcmd(as shown in Figure 2), specific implementation
It is as follows:
In formula: KvpAnd KviFor the proportionality coefficient and differential coefficient of voltage deviation PI link.
To make reactive current reference value signal meet photovoltaic generating system normal current range of operation, PI controlling unit is increased
If amplitude limit link, reactive current reference value signal is limited in [Iqmin,Iqmax] in section, usual IqminIt is set as -1, IqmaxIf
It is set to 1.
Reactive Power Control mode: according to current reactive power setting value QrefDivided by set end voltage measured value VmeasAnd it passes through
It crosses time delay process and obtains the reactive current reference value I of photovoltaic generating systemqcmd, it is implemented as follows:
In formula: TiqFor the delay time constant of time delay process.
Delay time constant TiqFor reacting the idle control response delay of photovoltaic generating system, due to converter control system
Fast response time, usual TiqTypical value can be 0.01~0.02s.In addition, to avoid photovoltaic power generation generator terminal brownout from making
Excessively high with reference to calculated value at reactive current, the minimum value of setting set end voltage measured value signal is 0.01pu.
Reactive voltage coordinated control mode: according to current generator terminal wattless power measurement value QmeasWith reactive power setting value
QcmdDeviation through idle deviation PI controlling unit calculate obtain voltage reference value Vcmd, and then calculate the voltage reference value and current
Set end voltage measured value VmeasDeviation, the deviation through voltage deviation PI controlling unit calculate obtain photovoltaic generating system it is idle
Current reference value signal Iqcmd, it is implemented as follows:
In formula: KqpAnd KqiFor the proportionality coefficient and differential coefficient of idle deviation PI link；KvpAnd KviFor voltage deviation PI ring
The proportionality coefficient and differential coefficient of section.
For the Voltage Reference value signal V for obtaining PI control systemcmdIn the normal working voltage range of photovoltaic generating system
It is interior, thus it is additionally arranged amplitude limit link in Voltage Reference value signal PI controlling unit, Voltage Reference value signal is limited in [Vmin,Vmax]
In section, usual VminIt is set as 0.85~0.95, VmaxIt is set as 0.95~1.05.
The control parameter K that each PI controlling unit of photovoltaic power generation powerless control system is related tovp、Kvi、KqpAnd KqiIt can be according to photovoltaic
The setting of electricity generation system concrete model.
By taking PowerFactory platform as an example, using the mentioned method of the present invention, using the photovoltaic power generation system model of foundation,
It is as shown in Figure 4: different idle control flag bits to be respectively set, different idle control models is set, by changing reference value letter
Number observation photovoltaic generating system set end voltage and reactive power output valve whether can respond reference value instruction, with verifying modeled
The accuracy of type.
In simulation process, setting photo-voltaic power generation station capacity is 110MWp, has the photovoltaic that 220 single-machine capacities are 500kW inverse
Become device composition, the electrical connection of photovoltaic plant access system as shown in figure 5, carry out photovoltaic generating system voltage control, idle respectively
The simulating, verifying of three kinds of power control, reactive voltage coordinated control difference control models.
(1) voltage mode control
Under the control model, idle control flag bit is provided that Vflag is set as 0, Qflag and is set as 1, by changing
Time variant voltage reference value signal observes photovoltaic generating system end voltage-tracing situation and photovoltaic generating system reactive power output valve,
When being specifically provided that t=3s, Voltage Reference value signal UrefBecome 0.98p.u.；When t=7s, Voltage Reference value signal Uref
Become 1.0p.u..Shown in the voltage-tracing voltage reference signal curve such as Fig. 6 (a) of photovoltaic generating system end, Fig. 6 (b) is photovoltaic hair
Electric system reactive power operation curve, Fig. 6 (c) are that photovoltaic generating system voltage measuring value follows the operation of voltage reference value bent
Line.As seen from the figure, when voltage reference value signal intensity, the idle output of photovoltaic generating system follows voltage instruction to change, when
When Voltage Reference value signal reduces, photovoltaic generating system reduces reactive power output and meets voltage reference value to drop lower terminal voltage,
When Voltage Reference value signal increases, photovoltaic generating system increases reactive power output and meets Voltage Reference to increase end voltage
Value, when Fig. 6 (c) simulation result shows the idle control of photovoltaic generating system using voltage mode control, end voltage can effectively with
Track Voltage Reference value signal, to demonstrate the correctness of voltage control system modeling.
(2) Reactive Power Control mode
Under the control model, idle control flag bit is provided that Vflag is set as 0 or 1, and Qflag is set as 0, passes through
Change reactive power reference qref signal and observe photovoltaic generating system reactive power output tracking situation, is specifically provided that t=3s
When, reactive power reference qref signal QrefSporting 0.2p.u., when t=7s, reactive power reference qref sign mutation is-
When 0.1p.u., Fig. 7 simulation result show the idle control of photovoltaic generating system using Reactive Power Control mode, photovoltaic power generation system
System reactive power output valve is capable of fast tracking reactive power reference qref signal, to demonstrate power reactive power control system modeling
Correctness.
(3) reactive voltage coordinated control mode
Under the control model, idle control flag bit is provided that Vflag is set as 1, Qflag and is set as 1, by changing
Become reactive power reference qref signal and observe photovoltaic generating system reactive power output tracking situation, for reactive voltage can be fully demonstrated
Photovoltaic generating system is idle when specific emulation is provided that t=3s to the enabling capabilities of system voltage under coordinated control mode
Value and power reference sign mutation is 0.2pu, and when t=7s, reactive power reference qref sign mutation is -0.1s.Compare reactive voltage
Control model and Reactive Power Control mode, when System Reactive Power reference value increases, system needs photovoltaic plant to issue nothing at this time
Function power help system voltage increases, conversely, system needs photovoltaic plant to reduce nothing at this time when System Reactive Power reference value reduces
Function power declines system voltage, and simulation result shows photovoltaic generating system in quick tracking reactive power (as shown in Figure 8)
Meanwhile more preferably voltage can be supported to meet system requirements using the photovoltaic generating system of reactive voltage coordinated control mode, thus
Demonstrate the correctness of voltage control system modeling.
Based on the same inventive concept, the application also proposes a kind of powerless control system for photovoltaic generating system, comprising:
Module is obtained, for the idle control model of the photovoltaic power generation system model based on setting, obtains photovoltaic power generation system
Reference value signal of the system under the idle control model；
Control module, for controlling the output of current transformer according to the reference value signal.
Wherein, obtaining module includes:
Receiving unit determines photovoltaic based on the control instruction content for receiving the control instruction of photovoltaic generating system
The idle control model of power system model；
Converting unit, for the value according to the idle control model dirty bit of the photovoltaic power generation system model.
Converting unit includes:
First setting subelement is 0 for working as voltage flag position Vflag, described idle when idle flag bit Qflag is 1
Control model is voltage mode control；
Second setting subelement is 0 or 1 for working as voltage flag position Vflag, when idle flag bit Qflag is 0, institute
Stating idle control model is Reactive Power Control mode；
Third sets subelement, is 1 for working as voltage flag position Vflag, described idle when idle flag bit Qflag is 1
Control model is reactive voltage coordinated control mode.
Obtain module further include:
First acquisition unit, for be under voltage mode control when photovoltaic generating system, by set end voltage measured value and
The deviation of voltage reference value predetermined inputs PI controller, exports the first reactive current reference value letter of photovoltaic generating system
Number, and the first reactive current reference value signal is limited in [Iqmin,Iqmax] the first idle electricity in range, after obtaining clipping
Flow reference value signal, wherein IqminLower current limit, I are exported for PI controllerqmaxUpper current limit is exported for PI controller；
Second acquisition unit, for being under Reactive Power Control mode when photovoltaic generating system, input set end voltage is surveyed
Magnitude and reactive power reference qref predetermined carry out delay process through time delay process, export the second of photovoltaic generating system
Reactive current reference value signal；
Third acquiring unit will be pre-defined for being under reactive voltage coordinated control mode when photovoltaic generating system
Reactive power reference qref and voltage mode control under PI controller proportionality coefficient and differential coefficient input PI controller, output
Voltage Reference value signal；And the Voltage Reference value signal is limited in [Vmin,Vmax] Voltage Reference in range, after obtaining clipping
Value signal, wherein VminFor PI controller output voltage lower limit, VmaxFor PI controller output voltage limit；Set end voltage is surveyed
The deviation of the Voltage Reference value signal after magnitude and clipping inputs PI controller, and the third for exporting photovoltaic generating system is idle
Current reference value signal.
Wherein, first acquisition unit includes: first to determine subelement, for determining the of photovoltaic generating system by following formula
One reactive current reference value signal:
In formula, VmeasFor set end voltage measured value, VrefFor set end voltage reference value predetermined, IqcmdIt is idle for first
Current reference value signal, KvpAnd KviThe proportionality coefficient and differential coefficient of PI controller under voltage mode control are respectively indicated, S is
Transmission function.
Second acquisition unit includes: the second determining subelement, for determining the second nothing of photovoltaic generating system by following formula
Function current reference value signal:
In formula, TiqFor the delay time constant of time delay process, QrefFor reactive power reference qref predetermined, VmeasFor
Set end voltage measured value, I'qcmdFor the second reactive current reference value signal, S is transmission function.
Third acquiring unit includes: that third determines subelement, for determined by following formula the third of photovoltaic generating system without
Function current reference value signal:
In formula, I "qcmdFor third reactive current reference value signal, KqpAnd KqiFor PI device under reactive voltage coordinated control mode
Proportionality coefficient and differential coefficient；KvpAnd KviFor the proportionality coefficient and differential coefficient of PI controller under voltage mode control, Qmeas
For generator terminal wattless power measurement value, QcmdFor reactive power reference qref predetermined, VcmdFor voltage reference value, VmeasFor generator terminal
Voltage measuring value, S are transmission function.
Control module includes:
Processing unit, for the type based on idle control model, by the photovoltaic power generation system under the idle control model
The generator terminal measured value of system and input of the reference value as current transformer；Current reference value signal under corresponding idle control model is made
For the control parameter of current transformer；
Tracking adjusts unit, for being adjusted and being become by ratio resonant regulator based in limits predetermined
The control parameter of device is flowed, to change the output of current transformer.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
Claims (16)
1. a kind of powerless control method for photovoltaic generating system, which is characterized in that the described method includes:
The idle control model of photovoltaic power generation system model based on setting obtains photovoltaic generating system and is in the idle control
Reference value signal under mode；
According to the reference value signal, the output of current transformer is controlled；
Wherein, the idle control model includes: voltage mode control, Reactive Power Control mode and reactive voltage coordinated control
Mode.
2. the method as described in claim 1, which is characterized in that the idle control model of the photovoltaic power generation system model is set
Surely include:
The control instruction for receiving photovoltaic generating system, determines the idle of photovoltaic power generation system model based on the control instruction content
Control model；
According to the value of the idle control model dirty bit of the photovoltaic power generation system model；
Wherein, the flag bit includes voltage flag position Vflag and idle flag bit Qflag.
3. method according to claim 2, which is characterized in that the idle control model according to photovoltaic power generation system model
The value of dirty bit includes:
When voltage flag position Vflag is 0, and idle flag bit Qflag is 1, the idle control model is voltage mode control；
When voltage flag position Vflag is 0 or 1, and idle flag bit Qflag is 0, the idle control model is reactive power
Control model；
When voltage flag position Vflag is 1, and idle flag bit Qflag is 1, the idle control model is reactive voltage coordination
Control model.
4. the method as described in claim 1, which is characterized in that the acquisition photovoltaic generating system is under idle control model
Reference value signal include:
When photovoltaic generating system is under voltage mode control, by set end voltage measured value and voltage reference value predetermined
Deviation inputs PI controller, exports the first reactive current reference value signal of photovoltaic generating system, and it is idle to limit described first
Current reference value signal is in [Iqmin,Iqmax] the first reactive current reference value signal in range, after obtaining clipping, wherein Iqmin
Lower current limit, I are exported for PI controllerqmaxUpper current limit is exported for PI controller；
When photovoltaic generating system is under Reactive Power Control mode, set end voltage measured value and idle function predetermined are inputted
Rate reference value carries out delay process through time delay process, exports the second reactive current reference value signal of photovoltaic generating system；
When photovoltaic generating system is under reactive voltage coordinated control mode, by reactive power reference qref predetermined and voltage
The proportionality coefficient of PI controller and differential coefficient input PI controller, output voltage reference value signal under control model；And it limits
The Voltage Reference value signal is in [Vmin,Vmax] Voltage Reference value signal in range, after obtaining clipping, wherein VminFor PI control
Device output voltage lower limit processed, VmaxFor PI controller output voltage limit；By the voltage after set end voltage measured value and clipping
The deviation of reference value signal inputs PI controller, exports the third reactive current reference value signal of photovoltaic generating system.
5. method as claimed in claim 4, which is characterized in that determine the first reactive current of photovoltaic generating system by following formula
Reference value signal:
In formula, VmeasFor set end voltage measured value, VrefFor set end voltage reference value predetermined, IqcmdFor the first reactive current
Reference value signal, KvpAnd KviThe proportionality coefficient and differential coefficient of PI controller under voltage mode control are respectively indicated, S is transmitting
Function.
6. method as claimed in claim 4, which is characterized in that determine the second reactive current of photovoltaic generating system by following formula
Reference value signal:
In formula, TiqFor the delay time constant of time delay process, QrefFor reactive power reference qref predetermined, VmeasFor generator terminal
Voltage measuring value, I'qcmdFor the second reactive current reference value signal, S is transmission function.
7. method as claimed in claim 4, which is characterized in that determine the third reactive current of photovoltaic generating system by following formula
Reference value signal:
In formula, I "qcmdFor third reactive current reference value signal, KqpAnd KqiFor the ratio of PI device under reactive voltage coordinated control mode
Example coefficient and differential coefficient；KvpAnd KviFor the proportionality coefficient and differential coefficient of PI controller under voltage mode control, QmeasFor machine
Hold wattless power measurement value, QcmdFor reactive power reference qref predetermined, VcmdFor voltage reference value, VmeasFor set end voltage
Measured value, S are transmission function.
8. the method as described in claim 1, which is characterized in that it is described according to reference value signal, control the output packet of current transformer
It includes:
Based on the type of idle control model, by the generator terminal measured value of the photovoltaic generating system under the idle control model and ginseng
Examine input of the value as current transformer；
Using the current reference value signal under corresponding idle control model as the control parameter of current transformer；
Based in limits predetermined, the control parameter of current transformer is adjusted by ratio resonant regulator, to change
The output of current transformer.
9. a kind of powerless control system for photovoltaic generating system characterized by comprising
Module is obtained, for the idle control model of the photovoltaic power generation system model based on setting, is obtained at photovoltaic generating system
Reference value signal under the idle control model；
Control module, for controlling the output of current transformer according to the reference value signal.
10. system as claimed in claim 9, which is characterized in that the acquisition module includes:
Receiving unit determines photovoltaic power generation based on the control instruction content for receiving the control instruction of photovoltaic generating system
The idle control model of system model；
Converting unit, for the value according to the idle control model dirty bit of the photovoltaic power generation system model.
11. system as claimed in claim 10, which is characterized in that the converting unit includes:
First setting subelement is 0 for working as voltage flag position Vflag, when idle flag bit Qflag is 1, the idle control
Mode is voltage mode control；
Second setting subelement is 0 or 1 for working as voltage flag position Vflag, when idle flag bit Qflag is 0, the nothing
Function control model is Reactive Power Control mode；
Third sets subelement, is 1 for working as voltage flag position Vflag, when idle flag bit Qflag is 1, the idle control
Mode is reactive voltage coordinated control mode.
12. system as claimed in claim 9, which is characterized in that the acquisition module further include:
First acquisition unit, for being under voltage mode control when photovoltaic generating system, by set end voltage measured value and in advance
The deviation of the voltage reference value of definition inputs PI controller, exports the first reactive current reference value signal of photovoltaic generating system,
And the first reactive current reference value signal is limited in [Iqmin,Iqmax] the first reactive current ginseng in range, after obtaining clipping
Examine value signal, wherein IqminLower current limit, I are exported for PI controllerqmaxUpper current limit is exported for PI controller；
Second acquisition unit inputs set end voltage measured value for being under Reactive Power Control mode when photovoltaic generating system
With reactive power reference qref predetermined, delay process is carried out through time delay process, export photovoltaic generating system second is idle
Current reference value signal；
Third acquiring unit, for being under reactive voltage coordinated control mode when photovoltaic generating system, by nothing predetermined
The proportionality coefficient of PI controller and differential coefficient input PI controller, output voltage under function value and power reference and voltage mode control
Reference value signal；And the Voltage Reference value signal is limited in [Vmin,Vmax] voltage reference value letter in range, after obtaining clipping
Number, wherein VminFor PI controller output voltage lower limit, VmaxFor PI controller output voltage limit；By set end voltage measured value
And the deviation of the Voltage Reference value signal after clipping inputs PI controller, exports the third reactive current of photovoltaic generating system
Reference value signal.
13. system as claimed in claim 12, which is characterized in that the first acquisition unit includes: the first determining subelement,
For determining the first reactive current reference value signal of photovoltaic generating system by following formula:
In formula, VmeasFor set end voltage measured value, VrefFor set end voltage reference value predetermined, IqcmdFor the first reactive current
Reference value signal, KvpAnd KviThe proportionality coefficient and differential coefficient of PI controller under voltage mode control are respectively indicated, S is transmitting
Function.
14. system as claimed in claim 12, which is characterized in that the second acquisition unit includes: the second determining subelement,
For determining the second reactive current reference value signal of photovoltaic generating system by following formula:
In formula, TiqFor the delay time constant of time delay process, QrefFor reactive power reference qref predetermined, VmeasFor generator terminal
Voltage measuring value, I'qcmdFor the second reactive current reference value signal, S is transmission function.
15. system as claimed in claim 12, which is characterized in that the third acquiring unit includes: that third determines subelement,
For determining the third reactive current reference value signal of photovoltaic generating system by following formula:
In formula, I "qcmdFor third reactive current reference value signal, KqpAnd KqiFor the ratio of PI device under reactive voltage coordinated control mode
Example coefficient and differential coefficient；KvpAnd KviFor the proportionality coefficient and differential coefficient of PI controller under voltage mode control, QmeasFor machine
Hold wattless power measurement value, QcmdFor reactive power reference qref predetermined, VcmdFor voltage reference value, VmeasFor set end voltage
Measured value, S are transmission function.
16. system as claimed in claim 9, which is characterized in that the control module includes:
Processing unit, for the type based on idle control model, by the photovoltaic generating system under the idle control model
Generator terminal measured value and input of the reference value as current transformer；Using the current reference value signal under corresponding idle control model as change
Flow the control parameter of device；
Tracking adjusts unit, for adjusting current transformer by ratio resonant regulator based in limits predetermined
Control parameter, to change the output of current transformer.
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