CN103399223A - New energy power generation system grid-connection intelligent detection and warning system and new energy power generation system grid-connection intelligent detection and warning method - Google Patents

New energy power generation system grid-connection intelligent detection and warning system and new energy power generation system grid-connection intelligent detection and warning method Download PDF

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CN103399223A
CN103399223A CN2013103143731A CN201310314373A CN103399223A CN 103399223 A CN103399223 A CN 103399223A CN 2013103143731 A CN2013103143731 A CN 2013103143731A CN 201310314373 A CN201310314373 A CN 201310314373A CN 103399223 A CN103399223 A CN 103399223A
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grid
signal
warning
electrical network
voltage
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CN103399223B (en
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孙秋野
张化光
马大中
郭思源
程启富
洪欢
黄博南
滕菲
郭靖
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东北大学
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Abstract

The invention relates to a new energy power generation system grid-connection intelligent detection and warning system and a new energy power generation system grid-connection intelligent detection and warning method, which belong to the technical field of new energy power generation and electrics. The system comprises current sensors, voltage sensors, a signal processing circuit, a multichannel converter, an A/D conversion circuit, a DSP processing center module, a warning device, a communication module and a display and printing module. The system has high detection efficiency and precision, is flexible and easy to operate, and realizes plug and play for new energy control, thus increasing the efficiency of new energy utilization and facilitating the unified management of the power sector and dispatching centers, and the system is highly independent, and does not need to be artificially monitored often; in addition, because a 'dual-core' mode is adopted by the system, although the warning device and the DSP processing center are associated with each other, the warning device and the DSP processing center still can separately operate; the system also has a comprehensive new energy power generation system parameter evaluation function taking both electricity price and transmission distance into consideration, thus ensuring that only new energy power generation systems with the best performance are integrated with a power grid.

Description

The grid-connected Intelligent Measurement warning device of a kind of grid-connected power generation system and method
Technical field
The invention belongs to generation of electricity by new energy and technical field of electricity, be specifically related to the grid-connected Intelligent Measurement warning device of a kind of grid-connected power generation system and method.
Background technology
The mankind enter 21 century, and a new energy revolution is carried out silently.Needs according to the sustainable development of socio-economy, people urgently call and set up with clean, pollution-free, practical, and inexhaustible, nexhaustible regenerative resource is that the energy structure of leading replaces gradually take the energy structure of fossil energy as leading seriously polluted, resource-constrained.Improving energy efficiency and regenerative resource service efficiency, reduce greenhouse gas emission, is the inexorable trend of following power network development.Along with the minimizing of world energy sources, the generation of electricity by new energy technology especially photovoltaic generation and wind-power electricity generation constantly developed, each state is all as important developing direction.China's Renewable Energy Resources is abundant, and except hydroelectric resources, sun power and wind energy resources are also very abundant, have some superiority.But generation of electricity by new energy has intermittence, undulatory property, the poor characteristics of schedulability, easily produces harmonic wave and " isolated island phenomenon ", in the situation that electrical network is admitted scarce capacity, the extensive grid-connected meeting of generation of electricity by new energy is served adverse effect to the electric system band.Electrical network must be controlled access capacity in controlled range, to reduce to greatest extent adverse effect, in order to guarantee the access of new forms of energy reliability, the new forms of energy of realizing " plug and play " that new forms of energy are controlled and distributing each shared proportion in the electricity energy, respond the call of country's " sturdy power grid ", must set up the measurement and control system constantly of an intelligent grid.
China's new-energy grid-connected system still is in the junior stage, the distributed grid-connected electricity generation system of new forms of energy adopts different also net modes according to the characteristics of self at present, assemble different grid-connected pick-up unit and net-connected controller, this has caused great difficulty for the unitized management of dispatching center.Therefore need to carry out standardized configuration to the new-energy grid-connected system architecture, new-energy grid-connected program complexity before overcoming, application process is loaded down with trivial details, time-consuming shortcoming, the efficiency of the control of grid-connected power generation system will improve greatly.
Summary of the invention
For the deficiencies in the prior art, the present invention proposes the grid-connected Intelligent Measurement warning device of a kind of grid-connected power generation system and method, to reach the purpose that improves detection efficiency, precision, flexible operation degree and reliability.
The grid-connected Intelligent Measurement warning device of a kind of grid-connected power generation system comprises:
Current sensor: for standard three-phase current signal and the frequency signal of isolating switch output terminal in the three-phase current signal that gathers the electrical network inverter output end, electrical network;
Voltage sensor: for standard three-phase voltage signal and the frequency signal of isolating switch output terminal in the three-phase voltage signal that gathers the electrical network inverter output end, electrical network;
Also comprise DSP processing enter module and warning device, wherein,
described warning device: for the DC current signal according to gathering the generation of electricity by new energy unit that obtains, the d. c. voltage signal of generation of electricity by new energy unit, the three-phase current signal of inverter output end in electrical network, the three-phase voltage signal of inverter output end in electrical network, the frequency signal of inverter output end in electrical network, the standard three-phase current signal of isolating switch output terminal in electrical network, eight data of standard-frequency signal of isolating switch output terminal in the standard three-phase voltage signal of isolating switch output terminal and electrical network in electrical network, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, six factors of frequency departure and voltage distortion rate, if above-mentioned six factors are not all in setting range separately, report to the police,
Described DSP processing enter module: calculate this genset of reaction for six factors calculating according to warning device, unit electricity price, genset to transmission range, environmental impact value and the important coefficient of electrical network and whether be suitable for grid-connected Comprehensive Assessment result.
also comprise signal processing circuit, traffic pilot, the A/D change-over circuit, communication module, show and print module, wherein, the output terminal of current sensor and the output terminal of voltage sensor are connected respectively the multi-channel input of signal processing circuit, the output terminal of signal processing circuit connects the input end of traffic pilot, the output terminal of traffic pilot connects the input end of A/D change-over circuit, one road output terminal of A/D change-over circuit connects the input end of warning device, the input end of another road output terminal DSP processing enter module, the output terminal of warning device connects the isolating switch in electrical network, and wireless connections DSP processing enter module, an output terminal of DSP processing enter module connects the input end of demonstration and print module, and wireless connections communication module.
Described warning device comprises alarm chip and control chip, and wherein, the output terminal of control chip connects the input end of alarm chip.
The method that adopts the grid-connected Intelligent Measurement warning device of grid-connected power generation system to detect comprises the following steps:
Step 1: adopt the electric resistance partial pressure method to gather d. c. voltage signal and the DC current signal of generation of electricity by new energy unit output terminal; Adopt the three-phase alternating current signal of inverter output end in a current sensor collection electrical network, adopt the three-phase alternating voltage signal of inverter output end in a voltage sensor collection electrical network, and the frequency acquisition signal; Adopt another current sensor to gather the standard three-phase alternating current signal of isolating switch output terminal in electrical network, adopt another voltage sensor to gather the standard three-phase alternating voltage signal of isolating switch output terminal in electrical network, and gather standard-frequency signal;
Step 2: the signal that gathers in step 1 is sent in signal processing circuit and carries out the filtering processing, and open traffic pilot, signal is carried out to the A/D conversion;
Step 3: warning device is according to DC current signal, d. c. voltage signal, three-phase current signal, three-phase voltage signal, frequency signal, standard three-phase current signal, standard three-phase voltage signal and eight data of standard-frequency signal after the A/D conversion, calculate power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and six factors of voltage distortion rate of obtaining, and judge that above-mentioned six factors are whether in setting range, if all in scope, perform step 5, otherwise perform step 4; If alarm breaks down, by DSP processing enter module, be sent to dispatching center and make whether grid-connected judgement;
Step 4: the alarm apparatus transmitted signal is controlled isolating switch, this generation of electricity by new energy unit and electrical network is disconnected, and report to the police;
Six factors that step 5:DSP processing enter module is calculated according to warning device, unit electricity price, genset are to transmission range, environmental impact value and the important coefficient of electrical network, calculate this genset of reaction and whether be suitable for grid-connected Comprehensive Assessment result, all signals and analysis result are stored;
Step 6: show and print module display performance data and histogram, and print data form and judged result;
Step 7: communication module and dispatching center carry out telecommunication, report result;
Step 8: if the Comprehensive Assessment result less than the historical record evaluation result, dispatching center sends and replaces the instruction that genset carries out;
Step 9: connect other generation of electricity by new energy units, repeating step 1~8.
The setting range of described six factors of step 3 is: the power factor scope is-0,95~0,95; Voltage deviation is at ﹣ 10%~7%; Voltage fluctuation is less than or equal to 3%; Tri-phase unbalance factor is less than or equal to 2%; The frequency departure scope is-0.5~0.2Hz; The voltage distortion rate is less than or equal to 5%.
Six factors that the described DSP processing enter of step 5 module is calculated according to warning device, unit electricity price, genset calculate the Comprehensive Assessment result of electricity generation system to transmission range, environmental impact value and the important coefficient of electrical network, comprise following formula:
F = X · μ + 1 n Σ k = 1 n Y k · β
Wherein: F is the Comprehensive Assessment result;
X=[C,L,E],Y=[1/α,ΔV,ΔU,Δf,ε u,U THD],
μ=[μ 123],β=[β 123456]
C is the unit electricity price; L is the transmission range of genset to electrical network; E is the influence value to environment, W 1For power generation project builds up front this area's environmental pollution index, W 2For power generation project builds up rear this area's environmental pollution index; For power factor: Δ U is voltage deviation; Δ V is voltage fluctuation; ε uFor tri-phase unbalance factor; Δ f is frequency departure; U THDFor the voltage distortion rate; The μ matrix is the important coefficient matrix of X matrix; The β matrix is the important coefficient matrix of Y matrix; Wherein, μ 1Important coefficient for C; μ 2Important coefficient for L; μ 3Important coefficient for E; β 1It is the important coefficient of 1/ α; β 2Important coefficient for Δ V; β 3Important coefficient for Δ U; β 4Important coefficient for Δ f; β 5For ε uImportant coefficient; β 6For U THDImportant coefficient.
Definite mode of described μ matrix and β matrix: adopt the AHP analytical hierarchy process to determine that in the evaluation process of the generation of electricity by new energy unit electricity price C of unit, genset are to the transmission range L of electrical network with to the influence value E of the environment relation of importance between any two, and according to above-mentioned three in twos between the importance relation set up three row three column matrix; Determine described six factors relation of importance between any two, and according to above-mentioned six in twos between the importance relation set up six row six column matrix; Solve the proper vector of the maximum characteristic root of above-mentioned two matrixes, namely obtain μ matrix and β matrix.
Advantage of the present invention:
The grid-connected Intelligent Measurement warning device of a kind of grid-connected power generation system of the present invention and method, this device detection efficiency is high, degree of accuracy is large, compares this type of invention in the past, flexible operation of the present invention, simply, new forms of energy are controlled and realized plug and play, accelerate utilization of new energy resources efficiency, facilitate the unitized management of power department and dispatching center, independence is strong, must not supervise constantly by manpower.In addition, the present invention adopts " double-core " pattern, alarm and DSP processing enter, although connect each other, but can work alone separately, if alarm goes wrong, can not report to the police and control open circuit ,Dan DSP center still can be to data analysis, transfer to grid-connected dispatching center and realize opening circuit; If the DSP center goes wrong, can not storage data and report, but still can realize opening circuit, and report to the police, make staff's consciousness; The present invention also has grid-connected power generation system comprehensive parameters evaluation function, and electricity price, transmission range are all taken into account, and what can guarantee to access electrical network is the best grid-connected power generation system of performance all the time.
The accompanying drawing explanation
Fig. 1 is the detection alarm equipments overall structure schematic diagram of an embodiment of the present invention;
Fig. 2 is detection alarm device and the electrical network connection layout of an embodiment of the present invention;
Fig. 3 is the RC low-pass filter circuit of an embodiment of the present invention;
Fig. 4 is the multi-path converter circuit of an embodiment of the present invention;
Fig. 5 is the A/D change-over circuit figure of an embodiment of the present invention;
Fig. 6 is the alarm circuit of an embodiment of the present invention;
Fig. 7 is the warning device chip connection layout of an embodiment of the present invention;
Fig. 8 is the DSP processing enter module connection layout of an embodiment of the present invention;
Fig. 9 is the data-carrier store circuit theory diagrams of an embodiment of the present invention;
Figure 10 is the LCD circuit schematic diagram of an embodiment of the present invention;
Figure 11 is the external power supply circuit theory diagrams of an embodiment of the present invention;
Figure 12 is the communicator hardware connection layout of an embodiment of the present invention;
Figure 13 is the grid-connected Intelligent Measurement general flow chart of the grid-connected power generation system of an embodiment of the present invention;
Figure 14 is matrix of coefficients determining step process flow diagram during the comprehensive parameters of an embodiment of the present invention is evaluated;
Figure 15 is the replacement concrete grammar process flow diagram of the electricity generation system of an embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, an embodiment of the present invention is described further.
As shown in Figure 1, the grid-connected Intelligent Measurement warning device of a kind of grid-connected power generation system (described new forms of energy comprise: sun power, geothermal energy, wind energy, ocean energy, biomass energy), comprise the first current sensor, the second current sensor, the first voltage sensor, second voltage sensor, signal processing circuit, traffic pilot, A/D change-over circuit, DSP processing enter module, warning device, communication module and demonstration and print module.
In the embodiment of the present invention, current sensor is for standard three-phase current signal and the frequency signal of isolating switch output terminal in the three-phase current signal, electrical network that gather the electrical network inverter output end; Voltage sensor is for standard three-phase voltage signal and the frequency signal of isolating switch output terminal in the three-phase voltage signal, electrical network that gather the electrical network inverter output end; Current sensor adopts the LMZBJ-10 model, and voltage sensor adopts TV52-100V/3.53V model; As shown in Figure 2, the first current sensor gathers the three-phase alternating current signal of inverter output end in electrical network, and the first voltage sensor gathers the three-phase alternating voltage signal of inverter output end in electrical network, and the frequency acquisition signal; The second current sensor gathers the standard three-phase alternating current signal of isolating switch output terminal in electrical network, and the second voltage sensor gathers the standard three-phase alternating voltage signal of isolating switch output terminal in electrical network, and gathers standard-frequency signal.
As shown in Figure 3, signal processing circuit is mainly filtering circuit, and in the embodiment of the present invention, adopting RC low-pass filter circuit, effect is to eliminate high-frequency interferencing signal.
As shown in Figure 4, described traffic pilot adopts chip AD7506, address input buffer and level conversion, decoding and driving, analog switch three parts, consists of.
As shown in Figure 5, the A/D change-over circuit adopts chip ADC0809A, adopts successive approximation method to carry out the A/D conversion, and output data latch and ternary output function in sheet are arranged, and can carry out 8 conversions, and the sheet internal clock is arranged.
described warning device is for the DC current signal according to gathering the generation of electricity by new energy unit that obtains, the d. c. voltage signal of generation of electricity by new energy unit, the three-phase current signal of inverter output end in electrical network, the three-phase voltage signal of inverter output end in electrical network, the frequency signal of inverter output end in electrical network, the standard three-phase current signal of isolating switch output terminal in electrical network, eight data of standard-frequency signal of isolating switch output terminal in the standard three-phase voltage signal of isolating switch output terminal and electrical network in electrical network, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, six factors of frequency departure and voltage distortion rate, if above-mentioned six factors are not all in setting range separately, report to the police.As shown in Figure 6, warning device is comprised of two 555 chips, can send chimes of doom, 8 pin VCC (or VDD) external power supply VCC, the scope of bipolar time-base circuits VCC is 4.5~16V, the scope of CMOS type time base circuit VCC is 3~18V, generally uses 5V, and 5 pin CO (or VC) are for controlling voltage end.If this end external voltage, can change the reference voltage of inner two comparers, when this end used time not, this end should be sealed in to 0.01 a μ F capacity earth, in case introduce, disturb, as shown in Figure 7, warning device also includes the TMS320LF2407 chip, can calculate to the received signal, compare ,He DSP center and carry out information interchange, can also control isolating switch, make the new forms of energy access or break away from electrical network.
Described DSP processing enter module calculates whether suitable grid-connected Comprehensive Assessment result of this genset of reaction for six factors calculating according to warning device, unit electricity price, genset to transmission range, environmental impact value and the important coefficient of electrical network.As shown in Figure 8, DSP processing enter module comprises dsp processor and external power supply, data storage and program storage, dsp processor adopts the TMS320F2812 chip, can carry out computational analysis to collection signal, mainly for the generation of electricity by new energy DC performance, system is carried out to the comprehensive parameters evaluation, also receive the analysis result of warning device, and all data and result are stored, with printer and liquid crystal display, be connected.
As shown in Figure 9, the data-carrier store model is CY7C1041BV, and the XD0 of its data input pin DO~D15 pin and DSP~XD15 pin is connected, and the XA0 of A0~A17 pin and DSP~XA17 pin is connected.
As shown in figure 10, described LCD types is LCM2864ZK, its RS pin is connected with the IOPF4 pin of DSP, the R/W pin is connected with the IOPF5 pin of DSP, the E pin is connected with the IOPF6 pin of DSP, D0~D7 pin is connected with IOPB1~IOPB7 pin, and the RST pin is connected with the IOPC1 pin.
The dsp processor external power supply provides energy as shown in figure 11.
As shown in figure 12, described communication module is the GPRS radio communication device, and for the information interchange of DSP and grid-connected dispatching center, its major part is the G20 chip, and with microcontroller, user identity differentiates that SIM card and power supply are connected.
the output terminal of described the first current sensor, the output terminal of the second current sensor, the output terminal of the first voltage sensor, the output terminal of second voltage sensor connects respectively four road In input ends of signal processing circuit, the output terminal OUT of signal processing circuit connects the input end S0~S7 of traffic pilot, the output terminal OUT of traffic pilot connects the input end IN0 of A/D change-over circuit, the output terminal D0 of A/D change-over circuit~D7 connects the input end DB0~DB7 of TMS320LF2407 chip in warning device, output terminal D0~D7 connects the input end XA0~XA7 of TMS320F2812 chip in DSP processing enter module simultaneously, isolating switch in the output terminal CLKOUT connection electrical network of TMS320LF2407 chip and 4 pin of first 555, and wireless connections DSP processing enter module, DSP processing enter module output terminal connects the input end of demonstration and print module, and wireless connections communication module.
The method that adopts the grid-connected Intelligent Measurement warning device of grid-connected power generation system to detect, method flow diagram as shown in figure 13, comprises the following steps:
Step 1: adopt the electric resistance partial pressure method to gather d. c. voltage signal and the DC current signal of generation of electricity by new energy unit output terminal; Adopt the first current sensor to gather the three-phase alternating current signal of inverter output end in electrical network, employing the first voltage sensor gathers the three-phase alternating voltage signal of inverter output end in electrical network, and the frequency acquisition signal; Adopt the second current sensor to gather the standard three-phase alternating current signal of isolating switch output terminal in electrical network, adopt the second voltage sensor to gather the standard three-phase alternating voltage signal of isolating switch output terminal in electrical network, and gather standard-frequency signal;
Step 2: the signal that gathers in step 1 is sent in signal processing circuit and carries out the filtering processing, and open traffic pilot, signal is carried out to the A/D conversion;
Step 3: warning device is according to DC current signal, d. c. voltage signal, three-phase current signal, three-phase voltage signal, frequency signal, standard three-phase current signal, standard three-phase voltage signal and eight data of standard-frequency signal after the A/D conversion, calculate power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and six factors of voltage distortion rate of obtaining, and judge whether (the power factor scope is-0 to above-mentioned six factors in setting range, 95~0,95; Voltage deviation is at ﹣ 10%~7%; Voltage fluctuation is less than or equal to 3%; Tri-phase unbalance factor is less than or equal to 2%; The frequency departure scope is-0.5~0.2Hz; The voltage distortion rate is less than or equal to 5%), if all in scope, perform step 5, otherwise perform step 4; If alarm breaks down, by DSP processing enter module, be sent to dispatching center and make whether grid-connected judgement;
Calculate active-power P, power factor α:
Wherein, U is ac line voltage; I is the AC line electric current; α is phase angle;
Calculating voltage deviation delta U:
ΔU = U - U N U N × 100 % - - - ( 3 )
Wherein, U NFor the standard ac line voltage;
Calculating voltage fluctuation Δ V:
ΔV = U max - U min U N × 100 % - - - ( 4 )
Wherein, U maxFor maximal value in ac line voltage; U minFor minimum value in ac line voltage;
Calculate tri-phase unbalance factor ε u:
ϵ u = U I U II × 100 % - - - ( 5 )
Wherein, U I = 1 - ( 3 - 6 L ) ,
U II = 1 + ( 3 - 6 L ) ,
U aU bU cBe respectively the line voltage of A, B, C phase;
Calculated rate deviation delta f:
Δf=f-f 1??????(6)
Wherein, f is a-c cycle; f 1For the standard a-c cycle;
Calculating voltage aberration rate U THD:
U THD = Σ 2 n ( U n U 1 ) 2 × 100 % - - - ( 7 )
Wherein, U 1For the fundametal compoment to ac line voltage U Fourier decomposition; U nFor the n component of degree n n to ac line voltage U Fourier decomposition.
Step 4: the alarm apparatus transmitted signal is controlled isolating switch, this generation of electricity by new energy unit and electrical network is disconnected, and report to the police;
Six factors that step 5:DSP processing enter module is calculated according to warning device, unit electricity price, genset calculate the Comprehensive Assessment result of electricity generation system to transmission range, environmental impact value and the important coefficient of electrical network, all signals and analysis result are stored;
Formula is as follows as a result to calculate Comprehensive Assessment:
F = X · μ + 1 n Σ k = 1 n Y k · β - - - ( 8 )
Wherein: F is the Comprehensive Assessment result;
X=[C, L, E]=[0.5,2,2.67]; C is the unit electricity price; L is the transmission range of genset to electrical network; E is the influence value to environment, W 1For power generation project builds up front this area's environmental pollution index, W 2For power generation project builds up rear this area's environmental pollution index.
Y=[1/α,ΔV,ΔU,Δf,ε u,U THD]=[1.04,0.03,0.04,0.02,0.01,0.05],
μ=[μ 123],β=[β 123456]
Wherein, μ 1Important coefficient for C; μ 2Important coefficient for L; μ 3Important coefficient for E; β 1It is the important coefficient of 1/ α; β 2Important coefficient for Δ V; β 3Important coefficient for Δ U; β 4Important coefficient for Δ f; β 5For ε uImportant coefficient; β 6For U THDImportant coefficient;
In the embodiment of the present invention, Δ f, α, U THD, Δ V is first class index, Δ U, ε uFor two-level index, C, L, E are three grades of indexs, observe β 4>=β 1>=β 6>=β 2>=β 3>=β 5, μ 1>=μ 2>=μ 3
Definite mode of described μ matrix and β matrix: as shown in figure 14,
Step 5.1, adopt the AHP analytical hierarchy process to determine that in the evaluation process of the genset electricity price C of unit, genset are to the transmission range L of electrical network with to the influence value E of the environment relation of importance between any two;
According to the rule in table 1, determine detecting the Comprehensive Assessment importance between each amount in the F process as a result: the unit electricity price is with respect to the importance C of transmission range C:L=2, the unit electricity price is with respect to the importance C of the impact of environment C:E=3, transmission range is with respect to the importance C of the impact of environment L:E=2;
Table 1
Scale Implication
1 Represent that two factors compare, have no less important
3 Represent that two factors compare, a factor is more important a little than another factor
5 Represent that two factors compare, a factor is obviously more important than another factor
7 Represent that two factors compare, a factor is strongly more important than another factor
9 Represent that two factors compare, a factor is extremely more important than another factor
2,4,6,8 The intermediate value of above-mentioned two adjacent judgements
Reciprocal Factor i and j judgement a relatively ij, factor j and i judgement a relatively ji=1/a ij
Step 5.2 and according to above-mentioned three in twos between the importance relation set up three row three column matrix;
ω 1 = C C : C C C : L C C : E C L : C C L : L C L : E C E : C C E : L C E : E = 1 2 3 1 / 2 1 2 1 / 3 1 / 2 1 - - - ( 9 )
Step 5.3, determine described six factors relation of importance between any two;
Frequency departure is with respect to the importance C of power factor inverse Δ f:1/ α=3, frequency departure is with respect to the importance C of voltage fluctuation Δ f: Δ V=4, frequency departure is with respect to the importance C of voltage deviation Δ f: Δ U=5, frequency departure is with respect to the importance of tri-phase unbalance factor Frequency departure is with respect to the importance of voltage distortion rate The power factor inverse is with respect to the importance of voltage distortion rate The power factor inverse is with respect to the importance C of voltage fluctuation 1/ α: Δ V=2, the power factor inverse is with respect to the importance C of voltage deviation 1/ α: Δ U=3, the power factor inverse is with respect to the importance of tri-phase unbalance factor Voltage fluctuation is with respect to the importance C of voltage deviation Δ V: Δ U=2, voltage fluctuation is with respect to the importance of tri-phase unbalance factor Voltage deviation is with respect to the importance of tri-phase unbalance factor
Step 5.4 and according to above-mentioned six in twos between the importance relation set up six row six column matrix;
ω 2 = C 1 / α : 1 / α C 1 / α : ΔV C 1 / α : ΔU C 1 / Δ : Δf C 1 / α : ϵ u C 1 / α : U THD C ΔV : 1 / α C ΔV : ΔV C ΔV : ΔU C ΔV : Δf C ΔV : ϵ u C ΔV : U THD C ΔU : 1 / α C ΔU : ΔV C ΔU : ΔU C ΔU : Δf C ΔU : ϵ u C ΔU : U THD C Δf : 1 / α C Δf : ΔV C Δf : ΔU C Δf : Δf C Δf : ϵ u C Δf : U THD C ϵ u : 1 / α C ϵ u : ΔV C ϵ u : ΔU C ϵ u : Δf C ϵ u : ϵ u C ϵ u : U THD C U THD : 1 / α C U THD : ΔV C U THD : ΔU C U THD : Δf C U THD : ϵ u C U THD : U THD = 1 2 3 1 / 3 4 1 1 / 2 1 2 1 / 4 3 1 / 2 1 / 3 1 / 2 1 1 / 5 2 1 / 3 3 4 5 1 6 3 1 / 4 1 / 3 1 / 2 1 / 6 1 1 / 4 1 2 3 1 / 3 4 1 - - - ( 10 )
Step 5.5, solve the proper vector of the maximum characteristic root of above-mentioned two matrixes, namely obtain μ matrix and β matrix.
Ask the proper vector of the maximum characteristic root of two matrixes,
Obtain [0.8468,0.4660,0.2565] and [0.3557,0.2146,0.1343,0.8216,0.0888,0.3557];
Consider every grade of index importance problem, order
μ=[μ 123]=1/10[0.8468,0.4660,0.2565]=[0.0847,0.0466,0.0257]
β=[β 123456]=[0.3557,0.2146,0.1343,0.8216,0.0888,0.3557];
Get n=1, F = X · μ + 1 n Σ k = 1 n Y k · β = [ 0.5,2,2.67 ] × [ 0.0847,0.0466,0.0257 ] + [ 1.04,0.03,0.04,0.02,0.01,0.05 ] × [ 0.3557,0.2146,0.1343,0.8216,0.0888,0.3557 ] 0.2042 + 0.4168 = 0.6210
Namely this system F value is; 0.6210.
Step 6: show and print module display performance data and histogram, and print data form and judged result;
Described demonstration and print module comprise liquid crystal display and printer, with the DSP processing enter, are connected, and display is for the various performance parameter historical datas of display, and printer prints analysis result and new-energy grid-connected application form with the form of form;
Printer is printed the new-energy grid-connected application form, and main contents comprise:
1) generation of electricity by new energy type, responsible institution, unit character;
2) unit electricity price, transmission range, environmental impact value;
3) three-phase alternating voltage, three-phase alternating current, active power, power factor;
4) voltage deviation, voltage fluctuation, imbalance of three-phase voltage degree, frequency departure, voltage harmonic aberration rate;
5) comprehensive parameters, whether allow grid-connected;
6) suggestions made after examination.
Step 7: communication module and dispatching center carry out telecommunication, report result;
Step 8: if the Comprehensive Assessment result less than the historical record evaluation result, dispatching center sends and replaces the instruction that the generation of electricity by new energy unit carries out;
The replacement concrete grammar of described grid-connected power generation system is the density analogy method, with computer programming, realize, F is analogous to the density in physics, the required total electric weight Q of electrical network analogy is become to the volume V of fixed volume, in order to be achieved as follows function: meet the grid-connected power generation system of grid-connected condition to each system generated energy summation And each systematic name is pressed to the F value and arranges, F value large under, F value little upper, if new electricity generation system occurs, the F value is less than original maximum F value, the system of F value maximum is oozed out from below, newly system adds from top still by the arrangement of F value, until Be that V fills, what can guarantee to access electrical network is the best grid-connected power generation system of performance all the time;
Concrete steps are: as shown in figure 15,
Step 8.1: input new electricity generation system title and Comprehensive Assessment parameter F;
Step 8.2: judge that F is whether less than the maximal value of existing system F, if perform step 8.3, otherwise, execution step 8.5;
Step 8.3: replace the maximum electricity generation system of F value with this electricity generation system;
Step 8.4: whether judgement gross generation this moment meets the electrical network needs, if perform step 8.5, otherwise performs step 8.1;
Step 8.5: finish.
Step 9: connect other generation of electricity by new energy units, repeating step 1~8.
This system detects a plurality of generation of electricity by new energy units, according to the scoring height of each genset, selects to be more suitable for the genset of grid-connected application.

Claims (7)

1. grid-connected Intelligent Measurement warning device of grid-connected power generation system comprises:
Current sensor: for standard three-phase current signal and the frequency signal of isolating switch output terminal in the three-phase current signal that gathers the electrical network inverter output end, electrical network;
Voltage sensor: for standard three-phase voltage signal and the frequency signal of isolating switch output terminal in the three-phase voltage signal that gathers the electrical network inverter output end, electrical network;
It is characterized in that: also comprise DSP processing enter module and warning device, wherein,
described warning device: for the DC current signal according to gathering the generation of electricity by new energy unit that obtains, the d. c. voltage signal of generation of electricity by new energy unit, the three-phase current signal of inverter output end in electrical network, the three-phase voltage signal of inverter output end in electrical network, the frequency signal of inverter output end in electrical network, the standard three-phase current signal of isolating switch output terminal in electrical network, eight data of standard-frequency signal of isolating switch output terminal in the standard three-phase voltage signal of isolating switch output terminal and electrical network in electrical network, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, six factors of frequency departure and voltage distortion rate, if above-mentioned six factors are not all in setting range separately, report to the police,
Described DSP processing enter module: calculate this genset of reaction for six factors calculating according to warning device, unit electricity price, genset to transmission range, environmental impact value and the important coefficient of electrical network and whether be suitable for grid-connected Comprehensive Assessment result.
2. the grid-connected Intelligent Measurement warning device of grid-connected power generation system according to claim 1, it is characterized in that: also comprise signal processing circuit, traffic pilot, the A/D change-over circuit, communication module, show and print module, wherein, the output terminal of current sensor and the output terminal of voltage sensor are connected respectively the multi-channel input of signal processing circuit, the output terminal of signal processing circuit connects the input end of traffic pilot, the output terminal of traffic pilot connects the input end of A/D change-over circuit, one road output terminal of A/D change-over circuit connects the input end of warning device, the input end of another road output terminal DSP processing enter module, the output terminal of warning device connects the isolating switch in electrical network, and wireless connections DSP processing enter module, an output terminal of DSP processing enter module connects the input end of demonstration and print module, and wireless connections communication module.
3. the grid-connected Intelligent Measurement warning device of grid-connected power generation system according to claim 1, it is characterized in that: described warning device comprises alarm chip and control chip, wherein, the output terminal of control chip connects the input end of alarm chip.
4. the method that adopts the grid-connected Intelligent Measurement warning device of grid-connected power generation system claimed in claim 1 to detect is characterized in that: comprise the following steps:
Step 1: adopt the electric resistance partial pressure method to gather d. c. voltage signal and the DC current signal of generation of electricity by new energy unit output terminal; Adopt the three-phase alternating current signal of inverter output end in a current sensor collection electrical network, adopt the three-phase alternating voltage signal of inverter output end in a voltage sensor collection electrical network, and the frequency acquisition signal; Adopt another current sensor to gather the standard three-phase alternating current signal of isolating switch output terminal in electrical network, adopt another voltage sensor to gather the standard three-phase alternating voltage signal of isolating switch output terminal in electrical network, and gather standard-frequency signal;
Step 2: the signal that gathers in step 1 is sent in signal processing circuit and carries out the filtering processing, and open traffic pilot, signal is carried out to the A/D conversion;
Step 3: warning device is according to DC current signal, d. c. voltage signal, three-phase current signal, three-phase voltage signal, frequency signal, standard three-phase current signal, standard three-phase voltage signal and eight data of standard-frequency signal after the A/D conversion, calculate power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and six factors of voltage distortion rate of obtaining, and judge that above-mentioned six factors are whether in setting range, if all in scope, perform step 5, otherwise perform step 4; If alarm breaks down, by DSP processing enter module, be sent to dispatching center and make whether grid-connected judgement;
Step 4: the alarm apparatus transmitted signal is controlled isolating switch, this generation of electricity by new energy unit and electrical network is disconnected, and report to the police;
Six factors that step 5:DSP processing enter module is calculated according to warning device, unit electricity price, genset are to transmission range, environmental impact value and the important coefficient of electrical network, calculate this genset of reaction and whether be suitable for grid-connected Comprehensive Assessment result, all signals and analysis result are stored;
Step 6: show and print module display performance data and histogram, and print data form and judged result;
Step 7: communication module and dispatching center carry out telecommunication, report result;
Step 8: if the Comprehensive Assessment result less than the historical record evaluation result, dispatching center sends and replaces the instruction that genset carries out;
Step 9: connect other generation of electricity by new energy units, repeating step 1~8.
5. the method that detects of the grid-connected Intelligent Measurement warning device of employing grid-connected power generation system according to claim 2, it is characterized in that: the setting range of described six factors of step 3 is: the power factor scope is-0,95~0,95; Voltage deviation is at ﹣ 10%~7%; Voltage fluctuation is less than or equal to 3%; Tri-phase unbalance factor is less than or equal to 2%; The frequency departure scope is-0.5~0.2Hz; The voltage distortion rate is less than or equal to 5%.
6. the method that detects of the grid-connected Intelligent Measurement warning device of employing grid-connected power generation system according to claim 2, it is characterized in that: six factors that the described DSP processing enter of step 5 module is calculated according to warning device, unit electricity price, genset calculate the Comprehensive Assessment result of electricity generation system to transmission range, environmental impact value and the important coefficient of electrical network, comprise following formula:
F = X · μ + 1 n Σ k = 1 n Y k · β
Wherein: F is the Comprehensive Assessment result;
X=[C,L,E],Y=[1/α,ΔV,ΔU,Δf,ε u,U THD],
μ=[μ 123],β=[β 123456]
C is the unit electricity price; L is the transmission range of genset to electrical network; E is the influence value to environment, W 1For power generation project builds up front this area's environmental pollution index, W 2For power generation project builds up rear this area's environmental pollution index; For power factor: Δ U is voltage deviation; Δ V is voltage fluctuation; ε uFor tri-phase unbalance factor; Δ f is frequency departure; U THDFor the voltage distortion rate; The μ matrix is the important coefficient matrix of X matrix; The β matrix is the important coefficient matrix of Y matrix; Wherein, μ 1Important coefficient for C; μ 2Important coefficient for L; μ 3Important coefficient for E; β 1It is the important coefficient of 1/ α; β 2Important coefficient for Δ V; β 3Important coefficient for Δ U; β 4Important coefficient for Δ f; β 5For ε uImportant coefficient; β 6For U THDImportant coefficient.
7. the method that detects of the grid-connected Intelligent Measurement warning device of employing grid-connected power generation system according to claim 6, it is characterized in that: definite mode of described μ matrix and β matrix: adopt the AHP analytical hierarchy process to determine that in the evaluation process of the generation of electricity by new energy unit electricity price C of unit, genset are to the transmission range L of electrical network with to the influence value E of the environment relation of importance between any two, and according to above-mentioned three in twos between the importance relation set up three row three column matrix; Determine described six factors relation of importance between any two, and according to above-mentioned six in twos between the importance relation set up six row six column matrix; Solve the proper vector of the maximum characteristic root of above-mentioned two matrixes, namely obtain μ matrix and β matrix.
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