CN110263481A - Distributed photovoltaic transient characterisitics test method - Google Patents
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Abstract
The present invention proposes a kind of distributed photovoltaic transient characterisitics test method, this method comprises: S1: the digital simulation model based on electric system simulation system building photo-voltaic power supply；S2: digital simulation model and photovoltaic controller are attached, and constitute digital physical mixed simulation model, and carry out fault simulation to photo-voltaic power supply according to digital physical mixed simulation model；S3: fault simulation result is inputted into photovoltaic transient current equation group, the corresponding photovoltaic transient state total current expression formula of photo-voltaic power supply is obtained, to characterize the photovoltaic transient characterisitics of photo-voltaic power supply.The present invention is based on RTDS hybrid simulation, relatively traditional simple method for leaning on Digital Simulation can obtain the transient fault characteristic of photo-voltaic power supply more accurately, can be effectively applied in the relay protection setting calculation containing distributed photovoltaic power power distribution network.
Description
Technical field
The present invention relates to technical field of power systems, in particular to a kind of distributed photovoltaic transient characterisitics test method.
Background technique
In recent years, as country advocates the development and utilization of clean energy resource, photo-voltaic power supply as it is a kind of it is emerging it is renewable clearly
The clean energy, shared specific gravity is higher and higher in power grid, and according to the statistics of National Energy Board, by the end of the end of the year 2017, China is too
Positive energy electricity generation grid-connecting amount reaches 130.25GW, has increased by 68.7% on a year-on-year basis.Especially in power distribution network, photo-voltaic power supply is with distribution form
A large amount of access power grids, thus the caused influence to relay protection of power system receives significant attention.
The fixed value calculation of electric grid relay protection is the short circuit current that system flows through protection when being occurred based on failure.Photo-voltaic power supply
The grid entry point of power distribution network is accessed usually all close to the region of load, i.e. line end, this changes the defeated of original system power distribution network
Electric form and topological structure make power grid be powered by original single ended power supply, become multiterminal power supply power supply.Therefore, photo-voltaic power supply
Access the problem of bringing adaptability to the relay protection setting principle and method originally based on power grid single ended power supply.
Meanwhile it is different from traditional synchronous generator electromechanical source, photovoltaic power generation passes through inverter as a kind of inverse type power supply
Realize the grid-connected output of power.When the grid collapses, due to the inertia coeffeicent very little of inverter, transient characterisitics with
The control model and relating to parameters of its controller, the ability for providing short circuit current to power grid are also limited by electronic power switch pipe
The through-current capability of itself.Therefore, when electric network fault, the calculation of short-circuit current provided by photo-voltaic power supply can not be according to suitable for synchronizing
The conventional algorithm of power supply solves.This just needs to find significantly more efficient method and calculates the short circuit current of photo-voltaic power supply, together
When need to test by transient characterisitics of the test platform to different photo-voltaic power supplies.
Summary of the invention
The present invention is directed at least solve one of above-mentioned technical problem.
For this purpose, it is an object of the invention to propose that a kind of distributed photovoltaic transient characterisitics test method, this method are based on
RTDS hybrid simulation, relatively traditional simple method for leaning on Digital Simulation, can obtain the transient state of photo-voltaic power supply more accurately
Fault characteristic can be effectively applied in the relay protection setting calculation containing distributed photovoltaic power power distribution network.
To achieve the goals above, the embodiment of the present invention proposes a kind of distributed photovoltaic transient characterisitics test method,
The following steps are included: S1: the digital simulation model based on electric system simulation system building photo-voltaic power supply；S2: by the number
Simulation model is attached with photovoltaic controller, constitutes digital physical mixed simulation model, and according to the digital physical mixed
Simulation model carries out fault simulation to the photo-voltaic power supply；S3: fault simulation result is inputted into photovoltaic transient current equation group, is obtained
To the corresponding photovoltaic transient state total current expression formula of the photo-voltaic power supply, to characterize the photovoltaic transient characterisitics of the photo-voltaic power supply.
In addition, distributed photovoltaic transient characterisitics test method according to the above embodiment of the present invention can also have it is following attached
The technical characteristic added:
In some instances, the S1 further comprises: the S1 further comprises: S11: imitative in the electric system
An engineering is created in the man-machine interface of true system；S12: hierarchical structure component and power electronic equipment are added in the engineering
Dedicated submodel；S13: photovoltaic array is built in the hierarchical structure component；S14: in the dedicated son of the power electronic equipment
Current transformer model is built in model；S15: building interface transformer, wherein the interface transformer and current transformer model pass through the
The connection of one breaker, the interface transformer are connect with power grid by the second breaker, are generated electricity by way of merging two or more grid systems with establishing distributed photovoltaic
Model；S16: it constructs the distributed photovoltaic and generates electricity by way of merging two or more grid systems the input and output amount of model.
In some instances, the current transformer model include: discharging circuit, preliminary filling electrical circuit, DC bus, 6 pulsation change
Phase bridge and filter.
In some instances, the distributed photovoltaic generate electricity by way of merging two or more grid systems model output quantity include imitated output quantity and switch it is defeated
Output；Each imitated output quantity is exported by itself GTIO plate to power amplification unit, each mould exported through power amplification unit
For quasi- output quantity as the analog input for being tested grid-connected controller, each switch output quantity is defeated by the GTIO plate of itself
Out, it is inputted as the digital quantity of the grid-connected controller of acyclic type；The imitated output quantity includes: current transformer outlet three-phase electricity
Pressure, current transformer export three-phase current, DC bus current, DC bus-bar voltage；The switch output quantity includes the second breaker
Status signal, the first breaker status signal；The distributed photovoltaic generate electricity by way of merging two or more grid systems model input quantity include number it is defeated
Enter amount, the digital input amount includes the trigger pulse of 6 bridge arms of current transformer net side, the trigger pulse of discharging circuit, second disconnected
The control command of road device, the control command of the first breaker, preliminary filling electrical circuit trigger pulse.
In some instances, the S2 further comprises: S21: the distributed photovoltaic is generated electricity by way of merging two or more grid systems model and tested
Try grid-connected controller connection；S22: it is described be tested grid-connected controller and obtain the distributed photovoltaic generate electricity by way of merging two or more grid systems mould
The failure sample rate current of type forms matrix
In some instances, the S21 further comprises: current transformer outlet three-phase voltage, current transformer export three-phase
Electric current is connect with the cutting-in control functional module for being tested grid-connected controller；The DC bus current and tested photovoltaic
The convertor controls functional module of net-connected controller connects, and the DC bus-bar voltage and is tested grid-connected controller
The connection of MPPT module；The status signal of the status signal of second breaker and the first breaker respectively be tested grid-connected control
The cutting-in control functional module of device processed connects；It is tested the second open circuit of cutting-in control functional module transmitting of grid-connected controller
The control command of device gives second breaker；The cutting-in control functional module transmitting first for being tested grid-connected controller is disconnected
The control command of road device gives first breaker；It is tested the cutting-in control functional module transmitting preliminary filling of grid-connected controller
The trigger pulse of electrical circuit gives the preliminary filling electrical circuit；It is tested the current transformer protective module transmitting off-load of grid-connected controller
The trigger pulse of circuit gives the discharging circuit；It is tested the current transformer control function module transmitting unsteady flow of grid-connected controller
The trigger pulse of 6 bridge arms of device net side gives 6 bridge arms of the current transformer net side.
In some instances, the S3 further comprises: S31: constructing the photovoltaic transient current equation group；S32: right
The photovoltaic transient current equation group is converted, and unknown variable is obtained, and calculates the value of the unknown variable；S33: it will calculate
The value of the obtained unknown variable substitutes into the photovoltaic transient current equation group, obtains photovoltaic transient state total current expression formula.
In some instances, the photovoltaic transient current equation group are as follows:
ifg=ig+Δig(1)；
Wherein, igFor the normal operating current before failure,For the initial phase angle of electric current, RgFor the equivalent of grid-connected circuit
Resistance, LgFor the equivalent inductance in grid-connected circuit；
ΔIfgmaxThe fault current maximum value generated in circuit, calculation formula are accessed in photovoltaic for electric network fault voltage
Are as follows:
Wherein,For the per unit value of impedance loop.
In some instances, in the S32, conversion formula that the photovoltaic transient current equation group is converted
Are as follows:
[ΔIg]=[A] [X] (4)；
Wherein, matrix [X] includes two unknown variables, respectively x1=Δ IfgmaxWith[A] is corresponding system
Matrix number；
The calculation formula of the value for calculating the unknown variable are as follows:
[X]=[A]+[ΔIg] (5)；
[A]+={ [A]T·[A]}-1·[A]T (6)。
In some instances, the photovoltaic transient state total current expression formula are as follows:
Wherein, ifgFor the photovoltaic transient state total current expression formula.
Distributed photovoltaic transient characterisitics test method according to an embodiment of the present invention, by electric system simulation system
The digital simulation model of photo-voltaic power supply is built, is then connected by external hardware interface with tested photovoltaic controller, shape
At closed loop test circuit, to carry out transient characterisitics test and analysis to different types of photo-voltaic power supply.This method is mainly with light
It is special with practical photovoltaic power supply system physics according to building with the mathematical model of photo-voltaic power supply based on the circuit parameter for lying prostrate power supply
Property consistent hybrid simulation test macro to analyze the transient characterisitics of different photo-voltaic power supplies be the short circuit meter of photo-voltaic power supply
It calculates and the relay protection setting of the power distribution network containing photovoltaic provides data supporting.Relatively traditional simple method for leaning on Digital Simulation, should
Method can obtain the transient fault characteristic of photo-voltaic power supply more accurately, can be effectively applied to and match containing distributed photovoltaic power
In the relay protection setting calculation of power grid.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the flow chart of distributed photovoltaic transient characterisitics test method according to an embodiment of the invention；
Fig. 2 is the simulation model schematic diagram of photovoltaic array accord to a specific embodiment of that present invention；
Fig. 3 is the simulation model schematic diagram of inverter accord to a specific embodiment of that present invention；
Fig. 4 is that distributed photovoltaic accord to a specific embodiment of that present invention generates electricity by way of merging two or more grid systems model schematic；
Fig. 5 be distributed photovoltaic accord to a specific embodiment of that present invention generate electricity by way of merging two or more grid systems model be tested it is grid-connected
The logical connection schematic diagram of controller；
Fig. 6 be distributed photovoltaic accord to a specific embodiment of that present invention generate electricity by way of merging two or more grid systems model be tested it is grid-connected
The electrical quantity connection schematic diagram of controller；
Fig. 7 is the essential electrical amount transient state schematic diagram of photo-voltaic power supply accord to a specific embodiment of that present invention.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, and for explaining only the invention, and is not considered as limiting the invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
Distributed photovoltaic transient characterisitics test method according to an embodiment of the present invention is described below in conjunction with attached drawing.
Fig. 1 is the flow chart of distributed photovoltaic transient characterisitics test method according to an embodiment of the invention.Such as Fig. 1 institute
Show, the distributed photovoltaic transient characterisitics test method, comprising the following steps:
Step S1: photovoltaic is constructed based on electric system simulation system (Real Time Digital Simulator, RTDS)
The digital simulation model of power supply.Specifically, that is, electric system simulation system RTDS is utilized, building photo-voltaic power supply primary system
Software model, and set the control hardware interface of photo-voltaic power supply.
In one embodiment of the invention, step S1 further comprises:
Step S11: an engineering is created in the man-machine interface (Draft) of electric system simulation system (RTDS)
(circuit)。
Step S12: hierarchical structure component (HIERARCHY COMPONENT) and electric power are added in engineering (circuit)
The dedicated submodel of electronic equipment (vsc_BRIDGE_BOX).
Step S13: photovoltaic array is built in hierarchical structure component (HIERARCHY COMPONENT).
The specific structure of photovoltaic array is as shown in Figure 2 comprising PVv2.def element and BUSCONN1 element；PVv2.def
There are two external inputs and two outputs for element tool.Two external inputs are to determine value, respectively INSOLATION and
TEMPERATURE directly gives its input value with two Slider elements respectively, and wherein the initial value of INSOLATION is set as
1000, maximum value is set as 2000, and minimum value is set as 0, and unit is set as W/M2；The initial value of TEMPERATURE is set as
25, maximum value is set as 80, and minimum value is set as -40, and unit is set as Degree.
Two outputs are connect through WIRE line with bus marker elements (BUSCONN1) respectively；Respectively P and N, by this two
A signal is accessed in BUSCONN1 element with " WIRE " connecting line, and parameter " Name ", " numc ", " grafc " are respectively set to
“CBUS1”、“2”、“NONE”。
Step S14: current transformer model is built in the dedicated submodel vsc_BRIDGE_BOX of power electronic equipment；
Wherein, current transformer model is connect by vsc_IFCTLI1 element with photovoltaic array model data, ginseng inside element
Number " Name ", " prc12 ", " Lnm1 ", " numc ", " dtyp ", " Lgrd ", " Rgrd ", " Laer ", " Raer " are respectively set to
“PVC1”、“1”、“CBUS1”、“2”、“Local”、“0.0011”、“0.0”、“0.001”、“0.0”。
Specifically, as shown in connection with fig. 3, current transformer model includes: discharging circuit, preliminary filling electrical circuit, DC bus, 6 pulsation
Commutation bridge and filter.
Wherein, discharging circuit includes the vsc_VALVE1 element and vsc_RES1 element being connected in series, vsc_VALVE1 member
The parameter " vtype " of part, " vswit ", " iswit ", " dswit ", " bfreq ", " prllr " is respectively set to " 2 ", " 0.5 ",
" 0.7 ", " 50.0 ", " 1.0 ".The parameter " R " of sc_RES1 is set as " 0.4 ".
Preliminary filling electrical circuit includes embedded-type electric potential source element (vsc_BRC3) and relay element (vsc_VALVE1), and pre-
Charge circuit is arranged in parallel with discharging circuit.The parameter " bty " of embedded-type electric potential source element (vsc_BRC3), " nmbr ", " R ",
" L " is respectively set to " RL ", " 1 ", " 0.1 ", " 0.001 ".The parameter " vtype " of relay element (vsc_VALVE1),
" vswit ", " iswit ", " dswit ", " bfreq ", " prllr ", " holdi " are respectively set to " BREAKER ", " 2 ",
" 0.5 ", " 0.7 ", " 50.0 ", " 1.0 ", " 100 ".
DC bus includes embedded branch-off element (vsc_BRC3), in parallel with discharging circuit.Embedded branch-off element
(vsc_BRC3) parameter " bty ", " nmbr ", " CMF " is respectively set to " C ", " 1 ", " 25000 ", and wherein CMF is bus capacitor
The capacitance value of device, is preset as 25000MicroF, and value can modify according to actual different engineerings.
6 pulsation commutation bridges include that three-phase six is pulsed commutation bridge element (vsc_PH3LEV2), and the element is double by 6 insulated gates
Gated transistors element composition.The parameter " nmlg1 " of vsc_PH3LEV2, " valvn ", " sepr ", " vswit ", " iswit ",
" dswit ", " bfreq ", " prllr " are respectively set to " 3 ", " VSC ", " 3 ", " 2 ", " 4 ", " 0.7 ", " 50 ", " 1.0 ".
Filter includes embedded bypass elements (vsc_BRC3), 6 pulsation commutation bridges every phase output terminal all with one
Vsc_BRC3 element is connected in series, and the parameter " bty " of current vsc_BRC3 element, " vsrc ", " nmbr ", " R ", " L " is set respectively
It is set to " RL ", " No ", " 3 ", " 0.001 ", " 280e-6 "；Latter aspect is connected in series to be grounded through another vsc_BRC3 element,
The parameter " bty " of the vsc_BRC3 element, " vsrc ", " nmbr ", " R ", " C " is respectively set to " RC ", " No ", " 3 ",
" 0.01 ", " 200 ".
Step S15: building interface transformer, wherein interface transformer and current transformer model pass through the first breaker BRK2
Connection, interface transformer are connect by the second breaker BRK1 with power grid, are generated electricity by way of merging two or more grid systems model with establishing distributed photovoltaic.Such as
Shown in Fig. 4, interface transformer include 3 single-phase transformer interface elements (vsc_IFCTRF1), parameter " vtpri ", " vtsec ",
" TMVA ", " freqb ", " trpos ", " txpos " are respectively set to " 35 ", " 0.2194 ", " 0.83333 ", " 50.0 ",
" 0.02743 ", " 0.06 ".
Step S16: building distributed photovoltaic generates electricity by way of merging two or more grid systems the input and output amount of model.
Wherein, distributed photovoltaic generate electricity by way of merging two or more grid systems model output quantity include imitated output quantity and switch output quantity.
Each imitated output quantity is exported by itself GTIO plate to power amplification unit, through each of power amplification unit output
For imitated output quantity as the analog input for being tested grid-connected controller, each switch output quantity is defeated by the GTIO plate of itself
Out, it is inputted as the digital quantity of the grid-connected controller of acyclic type.
Imitated output quantity includes: current transformer outlet three-phase voltage VSA/B/C (it is 0.69kV/5V that RTDS, which exports no-load voltage ratio), becomes
Flow device outlet three-phase current CRTA/B/C (it is 2.5kA/5V that RTDS, which exports no-load voltage ratio), DC bus current IPV (RTDS output no-load voltage ratio
For 2kV/5V), DC bus-bar voltage PVCAP (it is 3kV/5V that RTDS, which exports no-load voltage ratio).
Switch output quantity includes the status signal of the status signal B1ST of the second breaker BRK1, the first breaker BRK2
B2ST.Each switch output quantity is exported by the GTIO plate of itself, and the digital quantity as the grid-connected controller of acyclic type inputs.
The generate electricity by way of merging two or more grid systems input quantity of model of distributed photovoltaic includes digital input amount.The digital input amount includes current transformer net
The control life of the trigger pulse W1-6 of the bridge arm of side 6, the trigger pulse CHOPCNTL of discharging circuit VLV3, the second breaker BRK1
Enable the trigger pulse V5CNTL of B1CNTL, the control command B2CNTL of the first breaker BRK2 and preliminary filling electrical circuit VLV5.
Step S2: digital simulation model and photovoltaic controller are attached, and constitute digital physical mixed simulation model, and
Fault simulation is carried out to photo-voltaic power supply according to digital physical mixed simulation model.Specifically, can be incited somebody to action by preset hardware interface
Digital simulation model and photovoltaic controller carry out physical connection, and carry out fault simulation.
In one embodiment of the invention, step S2 further comprises:
Step S21: the distributed photovoltaic model that generates electricity by way of merging two or more grid systems is connect with grid-connected controller is tested.
Specifically, current transformer exports three-phase voltage VSA/B/C, current transformer exports three-phase current in conjunction with shown in Fig. 5 and Fig. 6
CRTA/B/C is connect with the cutting-in control functional module for being tested grid-connected controller.
DC bus current IPV is connect with the convertor controls functional module for being tested grid-connected controller, and direct current is female
Line voltage PVCAP is connect with the MPPT module for being tested grid-connected controller.
The status signal B2ST of the status signal B1ST of second breaker BRK1 and the first breaker BRK2 respectively with it is tested
Try the cutting-in control functional module connection of grid-connected controller.
The cutting-in control functional module for being tested grid-connected controller emits the control command of the second breaker BRK1
B1CNTL gives the second breaker BRK1；The cutting-in control functional module for being tested grid-connected controller emits the first breaker
The control command B2CNTL of BRK2 gives the first breaker BRK2.
It is tested the trigger pulse V5CNTL of the cutting-in control functional module preliminary filling electrical circuit VLV5 of grid-connected controller
To the preliminary filling electrical circuit VLV5 of the grid-connected simulation model of distributed photovoltaic.
It is tested the trigger pulse of the current transformer protective module transmitting discharging circuit VLV3 of grid-connected controller
Discharging circuit VLV3 of the CHOPCNTL to the grid-connected simulation model of distributed photovoltaic.
It is tested the triggering arteries and veins of current transformer control function module transmitting 6 bridge arms of current transformer net side of grid-connected controller
W1-6 is rushed to 6 bridge arms of current transformer net side of the grid-connected simulation model of distributed photovoltaic.
The distributed photovoltaic electrical and switching value in model (i.e. digital simulation model) of generating electricity by way of merging two or more grid systems is passed through into RTDS hardware
Circuit is drawn, and parameter name and the setting of channel no-load voltage ratio are as follows respectively: by the analog quantity inverter outlet three-phase voltage in model
VSA/B/C (RTDS output no-load voltage ratio is 0.69kV/5V), (RTDS exports no-load voltage ratio to inverter outlet three-phase current CRTA/B/C
2.5kA/5V), photovoltaic DC bus current IPV (it is 2kV/5V that RTDS, which exports no-load voltage ratio) and photovoltaic DC busbar voltage PVCAP
(RTDS export no-load voltage ratio be 3kV/5V), first by itself GTIO plate export to power amplification unit (model PAV-120B,
Middle voltage channel amplification factor is 1V/20V, and current channel amplification factor is 1V/4A), via each of power amplification unit output
Analog quantity is used to be tested the analog input of photovoltaic controller；RTDS exports the state that switching value is breaker BRK1, BRK2
Signal B1ST, B2ST are directly exported by RTDS by itself GTIO circuit board, and the number as acyclic type photovoltaic controller is defeated
Enter, level range is ± 5V；It is respectively the triggering of 6 bridge arms of current transformer net side that RTDS photovoltage model, which reserves digital quantity input quantity,
Pulse W1-6, the trigger pulse CHOPCNTL of discharging circuit VLV3, breaker BRK1 control command B1CNTL, breaker BRK2 control
System order B2CNTL, preliminary filling electrical circuit VLV5 trigger pulse V5CNTL, above each amount level range is ± 5V.
Step S22: being tested grid-connected controller and obtain distributed photovoltaic and generate electricity by way of merging two or more grid systems the failure sample rate current of model,
Form matrixFurther, capable of obtaining the grid-connected simulation model of distributed photovoltaic simultaneously, (i.e. distributed photovoltaic generates electricity by way of merging two or more grid systems mould
Type) essential electrical amount, such as shown in Fig. 7.Fig. 7 illustrates system shown in Fig. 3, when the midpoint transmission line of electricity LINE1 occurs three
When phase short trouble, the essential electrical amount transient-wave figure of photo-voltaic power supply.
Step S3: fault simulation result is inputted into photovoltaic transient current equation group, it is temporary to obtain the corresponding photovoltaic of photo-voltaic power supply
State total current expression formula, to characterize the photovoltaic transient characterisitics of photo-voltaic power supply.Specifically, i.e., by the simulation result generation in step S2
Enter photovoltaic transient current equation group, the coefficient in equation group is solved by Matrix Calculating, so that the transient state for obtaining the photo-voltaic power supply is complete
Current expression characterizes the photovoltaic transient characterisitics of photo-voltaic power supply by transient state total current expression formula.
In one embodiment of the invention, step S3 further comprises:
Step S31: construction photovoltaic transient current equation group.
Specifically, photovoltaic transient current equation group are as follows:
ifg=ig+Δig(1)；
Wherein, igFor the normal operating current before failure,For the initial phase angle of electric current, RgFor the equivalent of grid-connected circuit
Resistance, LgFor the equivalent inductance in grid-connected circuit；
ΔIfgmaxThe fault current maximum value generated in circuit, calculation formula are accessed in photovoltaic for electric network fault voltage
Are as follows:
Wherein,For the per unit value of impedance loop.
Due to Rg、LgIt is that can not accurately obtain in practical projects, is sampled by the amplitude of transient current, solve equation and acquire,
So carrying out step S32 to be solved.
Step S32: converting the photovoltaic transient current equation group in step S31, obtains unknown variable, and calculate to
Seek the value of variable.Specifically, converting to the formula 2 in step S31, unknown variable is obtained.
In step s 32, the conversion formula formula 2 in photovoltaic transient current equation group converted are as follows:
[ΔIg]=[A] [X] (4)；
Wherein, matrix [X] includes two unknown variables, respectively x1=Δ IfgmaxWith[A] is corresponding system
Matrix number；
Further, the calculation formula of the value of unknown variable is calculated are as follows:
[X]=[A]+[ΔIg] (5)；
[A]+={ [A]T·[A]}-1·[A]T (6)。
S33: the value for the unknown variable being calculated is substituted into photovoltaic transient current equation group, obtains photovoltaic transient state total current
Expression formula.Specifically, the unknown variable being calculated is substituted into the formula 1 in photovoltaic transient current equation group, to obtain light
The estimation analytical expression of transient current is lied prostrate, namely obtains photovoltaic transient state total current expression formula, to characterize the photovoltaic of photo-voltaic power supply
Transient characterisitics.
Specifically, photovoltaic transient state total current expression formula are as follows:
Wherein, ifgFor photovoltaic transient state total current expression formula.
To sum up, distributed photovoltaic transient characterisitics test method of the invention is based on electric system simulation system RTDS, passes through
Mathematical model, and predetermined hardware interface are built to actual photo-voltaic power supply, it is mixed to construct digital physics with actual photovoltaic controller
Analogue system is closed, to test the transient characteristic of different photo-voltaic power supplies；Pass through the simulation experiment result and photovoltaic transient current general purpose table
Up to formula, the final analytic equation for solving photovoltaic transient current can be effectively applied to the relay containing distributed photovoltaic power distribution network and protect
Protect adaptive setting.
Distributed photovoltaic transient characterisitics test method according to an embodiment of the present invention, by electric system simulation system
The digital simulation model of photo-voltaic power supply is built, is then connected by external hardware interface with tested photovoltaic controller, shape
At closed loop test circuit, to carry out transient characterisitics test and analysis to different types of photo-voltaic power supply.This method is mainly with light
It is special with practical photovoltaic power supply system physics according to building with the mathematical model of photo-voltaic power supply based on the circuit parameter for lying prostrate power supply
Property consistent hybrid simulation test macro to analyze the transient characterisitics of different photo-voltaic power supplies be the short circuit meter of photo-voltaic power supply
It calculates and the relay protection setting of the power distribution network containing photovoltaic provides data supporting.Relatively traditional simple method for leaning on Digital Simulation, should
Method can obtain the transient fault characteristic of photo-voltaic power supply more accurately, can be effectively applied to and match containing distributed photovoltaic power
In the relay protection setting calculation of power grid.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
A variety of change, modification, replacement and modification can be carried out to these embodiments in the case where being detached from the principle of the present invention and objective, this
The range of invention is by claim and its equivalent limits.
Claims (10)
1. a kind of distributed photovoltaic transient characterisitics test method, which comprises the following steps:
S1: the digital simulation model based on electric system simulation system building photo-voltaic power supply；
S2: the digital simulation model is attached with photovoltaic controller, the digital physical mixed simulation model of composition, and according to
The number physical mixed simulation model carries out fault simulation to the photo-voltaic power supply；
S3: fault simulation result is inputted into photovoltaic transient current equation group, it is complete to obtain the corresponding photovoltaic transient state of the photo-voltaic power supply
Current expression, to characterize the photovoltaic transient characterisitics of the photo-voltaic power supply.
2. distributed photovoltaic transient characterisitics test method according to claim 1, which is characterized in that the S1, further
Include:
S11: an engineering is created in the man-machine interface of the electric system simulation system；
S12: hierarchical structure component and the dedicated submodel of power electronic equipment are added in the engineering；
S13: photovoltaic array is built in the hierarchical structure component；
S14: current transformer model is built in the dedicated submodel of the power electronic equipment；
S15: building interface transformer, wherein the interface transformer is connect with current transformer model by the first breaker, described
Interface transformer is connect by the second breaker with power grid, is generated electricity by way of merging two or more grid systems model with establishing distributed photovoltaic；
S16: it constructs the distributed photovoltaic and generates electricity by way of merging two or more grid systems the input and output amount of model.
3. distributed photovoltaic transient characterisitics test method according to claim 2, which is characterized in that the current transformer model
It include: discharging circuit, preliminary filling electrical circuit, DC bus, 6 pulsation commutation bridges and filter.
4. distributed photovoltaic transient characterisitics test method according to claim 3, which is characterized in that wherein, the distribution
The output quantity of formula parallel network power generation model includes imitated output quantity and switch output quantity；
Each imitated output quantity is exported by itself GTIO plate to power amplification unit, each simulation exported through power amplification unit
Output quantity is exported as the analog input for being tested grid-connected controller, each output quantity that switchs by the GTIO plate of itself,
Digital quantity as the grid-connected controller of acyclic type inputs；
The imitated output quantity includes: current transformer outlet three-phase voltage, current transformer outlet three-phase current, DC bus current, straight
Flow busbar voltage；
The switch output quantity includes the status signal of the status signal of the second breaker, the first breaker；
The generate electricity by way of merging two or more grid systems input quantity of model of the distributed photovoltaic includes digital input amount, and the digital input amount includes current transformer
The control of the control command, the first breaker of the trigger pulse of 6 bridge arms of net side, the trigger pulse of discharging circuit, the second breaker
Make the trigger pulse of order, preliminary filling electrical circuit.
5. distributed photovoltaic transient characterisitics test method according to claim 4, which is characterized in that the S2, further
Include:
S21: the distributed photovoltaic model that generates electricity by way of merging two or more grid systems is connect with grid-connected controller is tested；
S22: it is described be tested grid-connected controller and obtain the distributed photovoltaic generate electricity by way of merging two or more grid systems the failure sample rate current of model,
Form matrix
6. distributed photovoltaic transient characterisitics test method according to claim 5, which is characterized in that the S21, further
Include:
Current transformer outlet three-phase voltage, current transformer outlet three-phase current and the cutting-in control for being tested grid-connected controller
Functional module connection；
The DC bus current is connect with the convertor controls functional module for being tested grid-connected controller, and the direct current is female
Line voltage is connect with the MPPT module for being tested grid-connected controller；
The status signal of the status signal of second breaker and the first breaker respectively be tested grid-connected controller and
The connection of network control functional module；
The cutting-in control functional module for being tested grid-connected controller emits the control command of the second breaker to described second
Breaker；
The cutting-in control functional module for being tested grid-connected controller emits the control command of the first breaker to described first
Breaker；
The trigger pulse of cutting-in control functional module transmitting preliminary filling electrical circuit of grid-connected controller is tested to the preliminary filling
Electrical circuit；
The trigger pulse of current transformer protective module transmitting discharging circuit of grid-connected controller is tested to the discharging circuit；
Be tested grid-connected controller current transformer control function module transmitting 6 bridge arms of current transformer net side trigger pulse to
6 bridge arms of the current transformer net side.
7. distributed photovoltaic transient characterisitics test method according to claim 6, which is characterized in that the S3, further
Include:
S31: the photovoltaic transient current equation group is constructed；
S32: the photovoltaic transient current equation group is converted, unknown variable is obtained, and calculates the value of the unknown variable；
S33: the value for the unknown variable being calculated is substituted into the photovoltaic transient current equation group, it is complete to obtain photovoltaic transient state
Current expression.
8. distributed photovoltaic transient characterisitics test method according to claim 7, which is characterized in that the photovoltaic transient state electricity
Flow equation group are as follows:
ifg=ig+Δig(1)；
Wherein, igFor the normal operating current before failure,For the initial phase angle of electric current, RgFor the equivalent resistance in grid-connected circuit,
LgFor the equivalent inductance in grid-connected circuit；
ΔIfgmaxThe fault current maximum value generated in circuit is accessed in photovoltaic for electric network fault voltage, its calculation formula is:
Wherein,For the per unit value of impedance loop.
9. distributed photovoltaic transient characterisitics test method according to claim 8, which is characterized in that right in the S32
The conversion formula that the photovoltaic transient current equation group is converted are as follows:
[ΔIg]=[A] [X] (4)；
Wherein, matrix [X] includes two unknown variables, respectively x1=Δ IfgmaxWith[A] is corresponding coefficient square
Battle array；
The calculation formula of the value for calculating the unknown variable are as follows:
[X]=[A]+[ΔIg](5)；
[A]+={ [A]T·[A]}-1·[A]T(6)。
10. distributed photovoltaic transient characterisitics test method according to claim 9, which is characterized in that the photovoltaic transient state
Total current expression formula are as follows:
Wherein, ifgFor the photovoltaic transient state total current expression formula.
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