CN102521473A - Grid-connected photovoltaic simulation generating system based on DIgSILENT (Digital Simulation and Electrical NeTwork) - Google Patents
Grid-connected photovoltaic simulation generating system based on DIgSILENT (Digital Simulation and Electrical NeTwork) Download PDFInfo
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Abstract
The invention discloses a grid-connected photovoltaic simulation generating system based on a DIgSILENT (Digital Simulation and Electrical NeTwork). The grid-connected photovoltaic simulation generating system comprises a photovoltaic battery, wherein the photovoltaic battery is connected into a power grid after passing through a direct current inductor, a Boost circuit, an inverter circuit and a main transformer sequentially; a bypass chopper circuit is connected to a connecting joint between the Boost circuit and the inverter circuit and used for realizing low-voltage ride through; a filter capacitor is connected to a joint between the photovoltaic battery and the direct current inductor and used for absorbing ripple waves caused by the switch-on and switch-off of the Boost circuit; and a direct current capacitor is connected to a connecting joint between the Boost circuit and the inverter circuit and used for buffering a power difference between the Boost circuit and an inverter. The grid-connected photovoltaic simulation generating system disclosed by the invention is closer to the actual situations of a photovoltaic generating system on a main circuit structure and a control system, can be applied to the operation analysis of various types of power systems, and provides a detailed and accurate proof for researching the influences of photovoltaic generation on the power systems.
Description
Technical field
The present invention relates to a kind of parallel networking type photovoltaic based on DIgSILENT
EmulationElectricity generation system can be used for studying the influence of photovoltaic generation to electric system, belongs to the power system digital simulation field.
Background technology
Solar energy resources is abundant, distribution is extensive, renewable, and utilizes process pollution-free, becomes one of first-selected object of new energy development.Photovoltaic generation is as a kind of form of mainly utilizing of sun power, and advantage such as little with its noise pollution, that maintenance cost is low demonstrates development space and application prospect incomparably widely.Domestic photovoltaic installed capacity increases year by year; Domestic photovoltaic generation was installed 140,000 kilowatts in 2008; Reached 300,000 kilowatts in 2009, estimate that domestic photovoltaic installed capacity in 2016 is expected to break through 5,000,000 kilowatts, large-scale grid-connectedly will certainly bring new challenge power network safety operation.Therefore, need insert the influence that electric system is caused to photovoltaic generation and carry out multianalysis, strengthen the ability of power grid operation to propose the specific aim measure.
DIgSILENT (DIgital Simulation and Electrical NeTwork; Digital Simulation and electrical network calculation procedure) be a leading high-end electric system simulation instrument; Possess functions such as trend calculating, short circuit calculation, stability analysis, frequency analysis, optimal load flow, can be used for the analysis and research of transmission and distribution network, generating, industry and the railway system, generation of electricity by new energy and intelligent grid.In addition, DIgSILENT have abundant component library, towards the programming language (DPL) of sequencing, towards the dynamic simulation language (DSL) and the abundant power electronic element of continuous operational process.Therefore DIgSILENT carries out photovoltaic generation to insert the first-selected instrument of electric system impact analysis.But existing photovoltaic generating system equivalent model is too simplified in DIgSILENT, output characteristics, maximum power point tracking process and low-voltage crossing process that can't real simulation photovoltaic generation battery; Parallel networking type photovoltaic electricity generation system model based on DIgSILENT disclosed by the invention aspect main circuit structure and the control system more near the situation of actual light photovoltaic generating system, can analyze photovoltaic generation more accurately and insert electric system is influenced.
Summary of the invention
Technical matters to be solved by this invention provides a kind of parallel networking type photovoltaic emulation electricity generation system model, solves and has the shortcoming that the photovoltaic generating system equivalent model is too simple, can't accurately simulate photovoltaic cell output characteristics, maximum power point tracking process and low-voltage crossing process among the DIgSILENT now;
The further technical matters to be solved of the present invention is to adopt this model to carry out trend calculating, short circuit calculation, Calculation on stability (electromechanical transient or electro-magnetic transient) harmonic analysis.
For solving the problems of the technologies described above, the present invention provides a kind of parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT, comprises photovoltaic cell, and said photovoltaic cell inserts electrical network through dc inductance, Boost circuit, inverter circuit and main transformer successively; The bypass chopper circuit is connected in the connected node between Boost circuit, the inverter circuit, is used to realize that low-voltage passes through; Filter capacitor is connected in the node between photovoltaic cell and the dc inductance, is used to absorb the ripple that the Boost contactor causes; Dc capacitor is connected in the connected node between Boost circuit, the inverter circuit, is used to cushion difference power between Boost circuit and the inverter.
According to the ratings of reality or each element of scientific research tentation data setting, confirm the working point of photovoltaic generating system through idle setting value in initial voltage ratio and the inverter trend calculation options in current setting value, the Boost circuit master data option in the photovoltaic cell trend calculation options.
Aforesaid parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT is characterized in that: said photovoltaic cell electric current is set by photovoltaic cell nonlinear equation solving model; Maximum power of photovoltaic cell point tracking control circuit comprises discrete control circuit and analog control circuit; Discrete control circuit utilizes the time clock model for discrete control time reference to be provided; Discrete control circuit produces the required photovoltaic cell voltage given value Upv_ref of photovoltaic cell voltage control circuit; Analog control circuit comprises the photovoltaic cell voltage controller, and the photovoltaic cell voltage controller is regulated the voltage ratio signal that produces the Boost circuit.
Said discrete control circuit is connected through time clock with analog control circuit, realizes the change to photovoltaic cell voltage given value in pulse place through integral element.
Aforesaid parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT is characterized in that: the voltage ratio signal that is produced the bypass chopper circuit by dc voltage controller.
Aforesaid parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT; It is characterized in that: said inverter circuit comprises inverter; Inverter links to each other with the current inner loop control circuit with the outer voltage control circuit respectively; The adjusting of outer voltage control circuit produces the required direct-axis current of current inner loop, friendship shaft current set-point id_ref, (id, iq are the variablees after three-phase current ia, ib, the coordinate transform of ic process to iq_ref, are respectively direct-axis current and friendship shaft current; Id_ref, iq_ref then are respectively direct-axis current in the current inner loop control, hand over the shaft current set-point), phaselocked loop provides the phase information of coordinate transform, and current inner loop is integrated in the inverter.
Aforesaid parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT is characterized in that: use Newton iteration method to find the solution photovoltaic cell mathematical model nonlinear equation and obtain the photovoltaic cell output current; For accelerating speed of convergence, initial value is elected 0.001s photovoltaic cell output current value before calculation time as.
The beneficial effect that the present invention reached:
The parallel networking type photovoltaic electricity generation system model based on DIgSILENT that the present invention proposes can be simulated the output characteristics of photovoltaic cell truly, exactly, possesses maximum power point tracking function and low-voltage and passes through function.Adopt this model can carry out trend calculating, short circuit calculation, Calculation on stability (electromechanical transient or electro-magnetic transient) harmonic analysis.
Description of drawings
Fig. 1 is a parallel networking type photovoltaic electricity generation system main circuit topological structure;
Fig. 2 is photovoltaic cell model and Boost circuit control framework;
Fig. 3 is a bypass chopper circuit control framework;
Fig. 4 is the control framework of combining inverter.
Embodiment
Below in conjunction with accompanying drawing and instantiation the modeling procedure based on the parallel networking type photovoltaic electricity generation system model of DIgSILENT that the present invention proposes is elaborated.
1. adopt built-in model to build the photovoltaic generating system main circuit shown in accompanying drawing 1.DC current source-representation photovoltaic cell; Photovoltaic cell inserts electrical network through Boost circuit, inverter circuit and main transformer; The bypass chopper circuit is used to realize that low-voltage passes through; Filter capacitor is used to absorb the ripple that the Boost contactor causes; Dc capacitor is used to cushion difference power between Boost circuit and the inverter.According to the ratings of reality or each element of scientific research tentation data setting, confirm the working point of photovoltaic generating system through idle setting value in initial voltage ratio and the inverter trend calculation options in current setting value, the Boost circuit master data option in the photovoltaic cell trend calculation options.
Through framework definition by the signal annexation between control elements and the controlling models like accompanying drawing 2,3, shown in 4, these frameworks have only been represented the signal annexation, do not have control function.Photovoltaic cell, Boost circuit and corresponding controlling models signal annexation thereof have been defined among Fig. 2; Wherein photovoltaic cell current i 0dc is set by photovoltaic cell nonlinear equation solving model; The control of maximum power of photovoltaic cell point tracking realizes through the mode that discrete control and simulation control combine; Wherein the time clock model provides time reference for discrete control; Discrete control produces setting value Upv_ref in the photovoltaic cell Control of Voltage, and the photovoltaic cell voltage controller is regulated the voltage ratio signal that produces the Boost circuit.Fig. 3 has defined the signal annexation of bypass chopper circuit and corresponding controlling models, and dc voltage controller produces the voltage ratio signal of bypass chopper circuit.Fig. 4 has defined the signal annexation of inverter circuit and corresponding controlling models; Outer voltage and current inner loop structure are adopted in the control of inverter; The outer voltage regulating and controlling produces current inner loop set-point id_ref, iq_ref; Phaselocked loop provides the phase information of coordinate transform, and current inner loop is integrated in the inverter, in block diagram, does not embody.
3. in step 1, being set up by control elements in the framework of step 2 definition is like photovoltaic cell, Boost circuit, bypass chopper circuit and inverter; Some control correlation model can be realized through built-in model, keeps model and register model like voltage measurement model, power measurement model, phaselocked loop model, sampling; Some controlling models then is to realize through the self-definition model of dynamic simulation language, like photovoltaic cell nonlinear equation solving model, maximum power point tracking algorithm model, photovoltaic Control of Voltage model, dc voltage controller model and circuit control device model.With maximally related self-definition model in the claim of the present invention be photovoltaic cell nonlinear equation solving model and maximum power point tracking algorithm model.Enumerate the code of the dynamic simulation language of these two models below.
Use Newton iteration method to find the solution photovoltaic cell mathematical model nonlinear equation and obtain the photovoltaic cell output current; For accelerating speed of convergence, initial value is elected 0.001s photovoltaic cell output current value before calculation time as; Can be according to requirements set computational accuracy and number of iterations, to choose more rationally because of initial value, this model has only adopted iteration 6 times.Photovoltaic cell nonlinear equation solving model code is following:
inc(U1)=Upv*Usb
inc(G)=1000
inc(T)=25
Vt=?Ns*(8.6173423e-5)*(T+273.15)
b0=1/Vt/n
Ipvn=Isc
Ipv0?=?(Ipvn+Ki*(T-Tn))*G/Gn
I0?=?(Isc+Ki*(T-Tn))/(exp((Voc+Kv*(T-Tn))*b0)-1)
I0Rsk0=I0*Rs*b0
RsRp?=Rs/Rp
U1?=?Upv*Usb
U=?select(U1>0,U1,0)/Ns_out
Ipv11=Ipv0-I0*(exp((U+Rs*delay(Ipv,0.001)/Np_out)*b0)-1)-(U+Rs*delay(Ipv,0.001)/Np_out)/Rp
Ipv1=?max(Ipv11,0)
t1=?exp((U+Rs*Ipv1)*b0)
d_Ipv1?=?(Ipv1-Ipv0+I0*(t1-1)+(U+Rs*Ipv1)/Rp)/(1+I0Rsk0*t1+RsRp)
Ipv2=?lim(Ipv1-d_Ipv1,0,Ipv0)
t2=?exp((U+Rs*Ipv2)*b0)
d_Ipv2?=?(Ipv2-Ipv0+I0*(t2-1)+(U+Rs*Ipv2)/Rp)/(1+I0Rsk0*t2+RsRp)
Ipv3=?lim(Ipv2-lim(d_Ipv2,-?Ipv0,?Ipv0),0,Ipv0)
t3=?exp((U+Rs*Ipv3)*b0)
d_Ipv3?=?(Ipv3-Ipv0+I0*(t3-1)+(U+Rs*Ipv3)/Rp)/(1+I0Rsk0*t3+RsRp)
Ipv4=?lim(Ipv3-lim(d_Ipv3,-?Ipv0,?Ipv0),0,Ipv0)
t4=?exp((U+Rs*Ipv4)*b0)
d_Ipv4?=?(Ipv4-Ipv0+I0*(t4-1)+(U+Rs*Ipv4)/Rp)/(1+I0Rsk0*t4+RsRp)
Ipv5=?lim(Ipv4-lim(d_Ipv4,-?Ipv0,?Ipv0),0,Ipv0)
t5=?exp((U+Rs*Ipv5)*b0)
d_Ipv5?=?(Ipv5-Ipv0+I0*(t5-1)+(U+Rs*Ipv5)/Rp)/(1+I0Rsk0*t5+RsRp)
Ipv6?=?lim(Ipv5-lim(d_Ipv5,-?Ipv0,?Ipv0),0,Ipv0)
Ipv_pie?=?select({abs(d_Ipv5/Ipv0)>0.001},Ipv1,Ipv6)
Ipv=?Np_out*select(Ipv_pie>0,Ipv_pie,0)
Ipv_out=-Np_out*select(Ipv_pie>0,Ipv_pie,0)/Isb
Wherein input variable is: photovoltaic cell voltage U pv, illumination G, temperature T; Output variable is: photovoltaic electric current output Ipv_out; Model parameter is: normal light photograph Gn, rated temperature Tn, rated short circuit current Isc, nominal short-circuit voltage Voc, maximum power point voltage Vm, maximum power point electric current I m, current temperature coefficient Ki, voltage temperature coefficient Kv, resistance in series Rs, parallel resistance Rp, diode desirability figure n, monolithic photovoltaic panel series unit are counted Ns, series unit is counted Ns_out, parallelly connected unit number Np_out, voltage reference value Usb, current reference value Isb; All the other are built-in variable.
The maximum power point tracking algorithm is conventional disturbance observation method or increment conductance method, and photovoltaic cell voltage is carried out disturbance; The wherein digital control realization of maximum power point tracking algorithm use; The control of photovoltaic voltage adopts simulation control to realize; These two links connect through time clock; Realize the change to photovoltaic cell voltage given value in pulse place through integral element, pulse width will narrow as far as possible (about 1%).Maximum power point tracking algorithm model code is following:
inc(Upvp)=Upv
inc(Ppvp)=Ppv
inc(x)=Upv_ref
condition?={(Upv-Upvp)*(Ppv-Ppvp)>0}
ratio?=select(abs(Ppv-Ppvp)>0,select(condition,1,-1),0)
step?=ratio*Kstep
x.=select(cl,step,0)
Upv_ref=limstate(x,0,Upvref_max)
Wherein input variable is: photovoltaic cell power P pv, previous moment photovoltaic cell power P pvp, photovoltaic cell voltage U pv, previous moment photovoltaic cell voltage U pvp, time clock cl; Output variable is: photovoltaic cell Control of Voltage setting value Upv_ref; Model parameter is: disturbance step-length COEFFICIENT K step; State variable is: x and Kstep are combined in definite disturbance step-length under the effect of time clock cl; All the other are built-in variable.
4. set up composite model according to the framework of definition in the step 2; Self-definition model according to definition in the step 3 is set up the control corresponding model, and corresponding model parameter is set; The built-in model of having set up in controlling models and the step 3 is added in the composite model, finally accomplishes building of parallel networking type photovoltaic electricity generation system model.5. corresponding calculated is configured,, sets tidal current computing method then, meritorious, idle controlling schemes, maximum iteration time and precision if carry out the working point that trend is calculated needs to set photovoltaic generating system; Need set and network interface inverter mathematical model in different calculation methods if carry out short circuit calculation, the method for short circuit calculation is set then, trouble spot and fault type, and corresponding Advanced Options is set according to different calculation methods; If carrying out Calculation on stability need select emulation mode (electromechanical transient or electro-magnetic transient), set the step-length scheme of emulation and the size of step-length then, and need set up event in the simulation process; Need to add harmonic source if carry out frequency analysis, and set network type, range of scanned frequencies and the output frequency data of Harmonics Calculation at the interface that is incorporated into the power networks.
Below disclose the present invention with preferred embodiment, so it is not in order to restriction the present invention, and all employings are equal to replacement or the technical scheme that obtained of equivalent transformation mode, all drop within protection scope of the present invention.
Claims (7)
1. the parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT comprises photovoltaic cell, and said photovoltaic cell inserts electrical network through dc inductance, Boost circuit, inverter circuit and main transformer successively; The bypass chopper circuit is connected in the connected node between Boost circuit, the inverter circuit, is used to realize that low-voltage passes through; Filter capacitor is connected in the node between photovoltaic cell and the dc inductance, is used to absorb the ripple that the Boost contactor causes; Dc capacitor is connected in the connected node between Boost circuit, the inverter circuit, is used to cushion difference power between Boost circuit and the inverter.
2. the parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT according to claim 1 is characterized in that: said photovoltaic cell electric current is set by photovoltaic cell nonlinear equation solving model; Maximum power of photovoltaic cell point tracking control circuit comprises discrete control circuit and analog control circuit; Discrete control circuit utilizes the time clock model for discrete control time reference to be provided; Discrete control circuit produces the required photovoltaic cell voltage given value Upv_ref of photovoltaic cell voltage control circuit; Analog control circuit comprises the photovoltaic cell voltage controller, and the photovoltaic cell voltage controller is regulated the voltage ratio signal that produces the Boost circuit.
3. the parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT according to claim 2; It is characterized in that: said discrete control circuit is connected through time clock with analog control circuit, realizes the change to photovoltaic cell voltage given value in pulse place through integral element.
4. the parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT according to claim 1 is characterized in that: the voltage ratio signal that is produced the bypass chopper circuit by dc voltage controller.
5. the parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT according to claim 1; It is characterized in that: said inverter circuit comprises inverter; Inverter links to each other with the current inner loop control circuit with the outer voltage control circuit respectively; The outer voltage control circuit is regulated and is produced the required direct-axis current of current inner loop, hands over shaft current set-point id_ref, iq_ref, and phaselocked loop provides the phase information of coordinate transform, and current inner loop is integrated in the inverter.
6. the parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT according to claim 2 is characterized in that: use Newton iteration method to find the solution photovoltaic cell mathematical model nonlinear equation and obtain the photovoltaic cell output current; For accelerating speed of convergence, initial value is elected 0.001s photovoltaic cell output current value before calculation time as.
7. the parallel networking type photovoltaic emulation electricity generation system based on DIgSILENT according to claim 2; It is characterized in that: if carry out the working point that trend is calculated needs to set photovoltaic generating system; Set tidal current computing method then, meritorious, idle controlling schemes, maximum iteration time and precision; Need set and network interface inverter mathematical model in different calculation methods if carry out short circuit calculation, the method for short circuit calculation is set then, trouble spot and fault type, and corresponding Advanced Options is set according to different calculation methods; If carrying out Calculation on stability then selects emulation mode, set the step-length scheme of emulation and the size of step-length then, and set up event in the simulation process; Need to add harmonic source if carry out frequency analysis, and set network type, range of scanned frequencies and the output frequency data of Harmonics Calculation at the interface that is incorporated into the power networks.
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| CN104268376A (en) * | 2014-09-11 | 2015-01-07 | 国家电网公司 | Online switch resistance assessment method for 3/2 connection mode switching station |
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| CN105488299A (en) * | 2015-12-16 | 2016-04-13 | 国家电网公司 | Method for building Xinjiang region power grid simulation model on the basis of DIgSILENT (DIgital Simulation and Electrical NeTwork) |
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| CN104268376A (en) * | 2014-09-11 | 2015-01-07 | 国家电网公司 | Online switch resistance assessment method for 3/2 connection mode switching station |
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| CN104834791A (en) * | 2015-05-22 | 2015-08-12 | 上海远宽能源科技有限公司 | Parallel real-time simulation method for photovoltaic power generation system |
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| CN105488299A (en) * | 2015-12-16 | 2016-04-13 | 国家电网公司 | Method for building Xinjiang region power grid simulation model on the basis of DIgSILENT (DIgital Simulation and Electrical NeTwork) |
| CN108205262A (en) * | 2016-12-20 | 2018-06-26 | 艾思玛新能源技术（江苏）有限公司 | A kind of inverter adjusting method and system |
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| CN111835026A (en) * | 2020-02-14 | 2020-10-27 | 上海浦源科技有限公司 | Battery energy storage grid-connected model simulation system based on DIgSILENT |
| CN111835026B (en) * | 2020-02-14 | 2021-08-24 | 上海浦源科技有限公司 | Battery energy storage grid-connected model simulation system based on DIgSILENT |
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