CN103399223B - A kind of grid-connected Intelligent Measurement warning device of grid-connected power generation system and method - Google Patents

Abstract

A kind of grid-connected Intelligent Measurement warning device of grid-connected power generation system of the present invention and method, belong to generation of electricity by new energy and technical field of electricity, this device comprises current sensor, voltage sensor, signal processing circuit, traffic pilot, A/D change-over circuit, DSP processing enter module, warning device, communication module and display and print module; This device detection efficiency is high, and degree of accuracy is large, flexible operation, and simply, to new forms of energy control realization 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, and alarm and DSP processing enter, although connect each other, but can work alone separately; 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 ensure to access electrical network is the best grid-connected power generation system of performance all the time.

Description

A kind of grid-connected Intelligent Measurement warning device 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.According to the needs of the sustainable development of socio-economy, people urgently call and set up with clean, pollution-free, practical, and inexhaustible, nexhaustible regenerative resource is the energy structure led replaces gradually based on the energy structure of the fossil energy of 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, generation of electricity by new energy technology especially photovoltaic generation and wind-power electricity generation is constantly developed, and each state is all as important developing direction.China's Renewable Energy Resources enriches, 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 the feature of intermittence, undulatory property, schedulability difference, easily produce harmonic wave and " island phenomenon ", when electrical network receives scarce capacity, extensive new energy power generation grid-connection can serve adverse effect to electric system band.Electrical network must control access capacity in controlled range, to reduce adverse effect to greatest extent, in order to ensure that new forms of energy reliability accesses, realize " plug and play " that new forms of energy control and the proportion of new forms of energy shared by electricity energy distributing each, the call of response country " sturdy power grid ", must set up the measurement and control system constantly of an intelligent grid.

China's new energy grid connection system is still in the junior stage, the distributed grid-connected electricity generation system of current new forms of energy adopts different synchronizing mode according to the feature of self, assemble different grid-connected pick-up units and net-connected controller, this causes great difficulty to the unitized management of dispatching center.Therefore need to carry out standardized configuration to new energy grid connection system structure, before overcoming, new-energy grid-connected program is complicated, and application process is loaded down with trivial details, time-consuming shortcoming, and 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 object improving detection efficiency, precision, flexible operation degree and reliability.

The grid-connected Intelligent Measurement warning device of a kind of grid-connected power generation system, comprising:

Current sensor: for gathering the three-phase current signal of inverter output end in electrical network, the standard three-phase current signal of grid disruption road device output terminal and frequency signal;

Voltage sensor: for gathering the three-phase voltage signal of inverter output end in electrical network, the standard three-phase voltage signal of grid disruption road device output terminal and frequency signal;

Also comprise DSP processing enter module and warning device, wherein,

Described warning device: for the DC current signal of the generation of electricity by new energy unit according to collection acquisition, 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 grid disruption road device output terminal, the standard three-phase voltage signal of grid disruption road device output terminal and standard-frequency signal eight data of grid disruption road device output terminal, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate six factors, if above-mentioned six factors are not all in respective setting range, then report to the police,

Described DSP processing enter module: six factors, unit price of power, genset for calculating according to warning device calculate this genset of reaction to the transmission range of electrical network, environmental influence value and important coefficient and whether be applicable to grid-connected Comprehensive Assessment result.

Also comprise signal processing circuit, traffic pilot, A/D change-over circuit, communication module, display and print module, wherein, the multi-channel input of the output terminal of current sensor and the output terminal difference connection signal treatment circuit of voltage sensor, 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 display 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.

Adopt the grid-connected Intelligent Measurement warning device of grid-connected power generation system to carry out the method detected, comprise the following steps:

Step 1: adopt 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 a current sensor to gather the three-phase alternating current signal of inverter output end in electrical network, adopt a voltage sensor to gather the three-phase alternating voltage signal of inverter output end in electrical network, and frequency acquisition signal; Adopt another current sensor to gather the standard three-phase alternating current signal of grid disruption road device output terminal, adopt another voltage sensor to gather the standard three-phase alternating voltage signal of grid disruption road device output terminal, and gather standard-frequency signal;

Step 2: the signal gathered in step 1 is sent in signal processing circuit and carries out filtering process, and open traffic pilot, A/D conversion is carried out to signal;

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 standard-frequency signal eight data after A/D conversion, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate six factors, and judge above-mentioned six factors whether in setting range, if all in scope, then perform step 5, otherwise perform step 4; If alarm breaks down, be then sent to dispatching center by DSP processing enter module and make whether grid-connected judgement;

Step 4: alarm apparatus sends signal and controls isolating switch, this generation of electricity by new energy unit and electrical network is disconnected, and reports to the police;

Six factors that step 5:DSP processing enter module calculates according to warning device, unit price of power, genset are to the transmission range of electrical network, environmental influence value and important coefficient, calculate this genset of reaction and whether be applicable to grid-connected Comprehensive Assessment result, all signals and analysis result are stored;

Step 6: display 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, reports result;

Step 8: if Comprehensive Assessment result is less than historical record evaluation result, then dispatching center sends the instruction of replacing genset and carrying out;

Step 9: connect other generation of electricity by new energy units, repeats step 1 ~ 8.

The setting range of six factors described in step 3 is: 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%; Frequency departure scope is-0.5 ~ 0.2Hz; Voltage distortion rate is less than or equal to 5%.

Six factors that DSP processing enter module described in step 5 calculates according to warning device, unit price of power, genset calculate the Comprehensive Assessment result of electricity generation system to the transmission range of electrical network, environmental influence value and important coefficient, comprise following formula:

$F=X\·\mathrm{\μ}+\frac{1}{n}\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{Y}_k\·\mathrm{\β}$

Wherein: F is Comprehensive Assessment result;

X=[C,L,E]，Y=[1/α,ΔV,ΔU,Δf,ε _u,U _THD]，

μ=[μ ₁,μ ₂,μ ₃]，β=[β ₁,β ₂,β ₃,β ₄,β ₅,β ₆]

C is 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 environmental pollution indexes, W ₂for power generation project builds up rear this area environmental pollution indexes; 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 voltage distortion rate; μ matrix is the important coefficient matrix of X matrix; β matrix is the important coefficient matrix of Y matrix; Wherein, μ ₁for the important coefficient of C; μ ₂for the important coefficient of L; μ ₃for the important coefficient of E; β ₁it is the important coefficient of 1/ α; β ₂for the important coefficient of Δ V; β ₃for the important coefficient of Δ U; β ₄for the important coefficient of Δ f; β ₅for ε _uimportant coefficient; β ₆for U _tHDimportant coefficient.

The determination mode of described μ matrix and β matrix: adopt AHP analytical hierarchy process to determine the relation of in the evaluation process of generation of electricity by new energy unit unit price of power C, the genset transmission range L to electrical network and the influence value E to environment importance between any two, and according to above-mentioned three between two between importance relation set up three row three column matrix; Determine the relation of six described factors importance between any two, and according to above-mentioned six between two between 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:

A kind of grid-connected Intelligent Measurement warning device of grid-connected power generation system of the present invention and method, this device detection efficiency is high, degree of accuracy is large, mutually this type of invention than ever, flexible operation of the present invention, simply, to new forms of energy control realization 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, but DSP center still can, to data analysis, transfer to grid-connected dispatching center to realize open circuit; If DSP center goes wrong, can not storage data and report, but still can realize open 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 ensure to access electrical network is the best grid-connected power generation system of performance all the time.

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 model calling figure 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 communication device hardware connection layout of an embodiment of the present invention;

Figure 13 is the grid-connected Intelligent Measurement general flow chart of grid-connected power generation system of an embodiment of the present invention;

Figure 14 is matrix of coefficients determining step process flow diagram in the comprehensive parameters evaluation of an embodiment of the present invention;

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, a kind of grid-connected power generation system grid-connected Intelligent Measurement warning device (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, the second voltage sensor, signal processing circuit, traffic pilot, A/D change-over circuit, DSP processing enter module, warning device, communication module and display and print module.

In the embodiment of the present invention, current sensor is for gathering the three-phase current signal of inverter output end in electrical network, the standard three-phase current signal of grid disruption road device output terminal and frequency signal; Voltage sensor is for gathering the three-phase voltage signal of inverter output end in electrical network, the standard three-phase voltage signal of grid disruption road device output terminal and frequency signal; Current sensor adopts 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 frequency acquisition signal; Second current sensor gathers the standard three-phase alternating current signal of grid disruption road device output terminal, and the second voltage sensor gathers the standard three-phase alternating voltage signal of grid disruption road device output terminal, and gathers standard-frequency signal.

As shown in Figure 3, signal processing circuit is mainly filtering circuit, adopts RC low-pass filter circuit in the embodiment of the present invention, and high-frequency interferencing signal is eliminated in effect.

As shown in Figure 4, described traffic pilot adopts chip AD7506, is made up of address input buffer and level conversion, decoding and driving, analog switch three part.

As shown in Figure 5, A/D change-over circuit adopts chip ADC0809A, adopts successive approximation method to carry out A/D conversion, has output data latch and ternary output function in sheet, can carry out 8 conversions, have sheet internal clock.

Described warning device is used for the DC current signal according to gathering the generation of electricity by new energy unit obtained, 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 grid disruption road device output terminal, the standard three-phase voltage signal of grid disruption road device output terminal and standard-frequency signal eight data of grid disruption road device output terminal, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate six factors, if above-mentioned six factors are not all in respective setting range, then report to the police.As shown in Figure 6, warning device is made up of two piece of 555 chip, chimes of doom can be sent, 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 control voltage end.If this end external voltage, then can change the reference voltage of inner two comparers, when this end not used time, this end should be sealed in a 0.01 μ F capacity earth, in case introduce interference, as shown in Figure 7, warning device also includes TMS320LF2407 chip, can carry out to the received signal calculating, comparing, and information interchange is carried out at DSP center, can also isolating switch be controlled, new forms of energy are accessed or departs from electrical network.

Six factors that described DSP processing enter module is used for calculating according to warning device, unit price of power, genset calculate the whether applicable grid-connected Comprehensive Assessment result of this genset of reaction to the transmission range of electrical network, environmental influence value and important coefficient.As shown in Figure 8, DSP processing enter module comprises dsp processor and external power supply, data storage and program storage, dsp processor adopts TMS320F2812 chip, computational analysis can be carried out to collection signal, mainly for generation of electricity by new energy DC performance, comprehensive parameters evaluation is carried out to system, also receive the analysis result of warning device, and all data and result are stored, be connected with printer and liquid crystal display.

As shown in Figure 9, data-carrier store model is CY7C1041BV, and its data input pin DO ~ D15 pin is connected with XD0 ~ XD15 pin of DSP, and A0 ~ A17 pin is connected with XA0 ~ XA17 pin of DSP.

As shown in Figure 10, described LCD types is LCM2864ZK, its RS pin is connected with the IOPF4 pin of DSP, R/W pin is connected with the IOPF5 pin of DSP, E pin is connected with the IOPF6 pin of DSP, D0 ~ D7 pin is connected with IOPB1 ~ IOPB7 pin, and RST pin is connected with IOPC1 pin.

Dsp processor external power supply provides energy as shown in figure 11.

As shown in figure 12, described communication module is GPRS radio communication device, and for the information interchange of DSP and grid-connected dispatching center, its major part is G20 chip, and with microcontroller, user identity differentiates that SIM card and power supply are connected.

The output terminal of the first described current sensor, the output terminal of the second current sensor, the output terminal of the first voltage sensor, four road In input ends of the output terminal difference connection signal treatment circuit of the second voltage sensor, 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, output terminal D0 ~ the D7 of A/D change-over circuit 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 display and print module, and wireless connections communication module.

Adopt the grid-connected Intelligent Measurement warning device of grid-connected power generation system to carry out the method detected, method flow diagram as shown in figure 13, comprises the following steps:

Step 1: adopt 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, adopt the first voltage sensor to gather the three-phase alternating voltage signal of inverter output end in electrical network, and frequency acquisition signal; Adopt the second current sensor to gather the standard three-phase alternating current signal of grid disruption road device output terminal, adopt the second voltage sensor to gather the standard three-phase alternating voltage signal of grid disruption road device output terminal, and gather standard-frequency signal;

Step 2: the signal gathered in step 1 is sent in signal processing circuit and carries out filtering process, and open traffic pilot, A/D conversion is carried out to signal;

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 standard-frequency signal eight data after A/D conversion, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate six factors, and judge whether (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%; Frequency departure scope is-0.5 ~ 0.2Hz; Voltage distortion rate is less than or equal to 5%), if all in scope, then perform step 5, otherwise perform step 4; If alarm breaks down, be then sent to dispatching center by DSP processing enter module and make whether grid-connected judgement;

Calculate active-power P, power factor α:

Wherein, U is ac line voltage; I is AC line electric current; α is phase angle;

Calculating voltage deviation delta U:

$\mathrm{\ΔU}=\frac{U-U_N}{U_N}\×100\%---\left(3\right)$

Wherein, U _nfor standard AC line voltage;

Calculating voltage fluctuation Δ V:

$\mathrm{\ΔV}=\frac{U_{\max }-U_{\min }}{U_N}\×100\%---\left(4\right)$

Wherein, U _maxfor maximal value in ac line voltage; U _minfor minimum value in ac line voltage;

Calculate tri-phase unbalance factor ε _u:

${\mathrm{\ϵ}}_u=\frac{U_I}{U_{\mathrm{II}}}\×100\%---\left(5\right)$

Wherein, $U_I=\sqrt{1-\sqrt{(3-6L)}},$

$U_{\mathrm{II}}=\sqrt{1+\sqrt{(3-6L)}},$

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 standard AC frequency;

Calculating voltage aberration rate U _tHD:

$U_{\mathrm{THD}}=\sqrt{\underset{2}{\overset{n}{\mathrm{\Σ}}}{\left(\frac{U_n}{U_1}\right)}^2}\×100\%---\left(7\right)$

Wherein, U ₁for the fundametal compoment to ac line voltage U Fourier decomposition; U _nfor the n-th component of degree n n to ac line voltage U Fourier decomposition.

Step 4: alarm apparatus sends signal and controls isolating switch, this generation of electricity by new energy unit and electrical network is disconnected, and reports to the police;

Six factors that step 5:DSP processing enter module calculates according to warning device, unit price of power, genset calculate the Comprehensive Assessment result of electricity generation system to the transmission range of electrical network, environmental influence value and important coefficient, store all signals and analysis result;

Calculate Comprehensive Assessment result formula as follows:

$F=X\·\mathrm{\μ}+\frac{1}{n}\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{Y}_k\·\mathrm{\β}---\left(8\right)$

Wherein: F is Comprehensive Assessment result;

X=[C, L, E]=[0.5,2,2.67]; C is 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 environmental pollution indexes, W ₂for power generation project builds up rear this area environmental pollution indexes.

Y=[1/α,ΔV,ΔU,Δf,ε _u,U _THD]=[1.04,0.03,0.04,0.02,0.01,0.05]，

μ=[μ ₁,μ ₂,μ ₃]，β=[β ₁,β ₂,β ₃,β ₄,β ₅,β ₆]

Wherein, μ ₁for the important coefficient of C; μ ₂for the important coefficient of L; μ ₃for the important coefficient of E; β ₁it is the important coefficient of 1/ α; β ₂for the important coefficient of Δ V; β ₃for the important coefficient of Δ U; β ₄for the important coefficient of 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, in accordance with β ₄>=β ₁>=β ₆>=β ₂>=β ₃>=β ₅, μ ₁>=μ ₂>=μ ₃;

The determination mode of described μ matrix and β matrix: as shown in figure 14,

Step 5.1, AHP analytical hierarchy process is adopted to determine the relation of in the evaluation process of genset unit price of power C, the genset transmission range L to electrical network and the influence value E to environment importance between any two;

Determine detecting the importance in Comprehensive Assessment result F process between each amount according to the rule in table 1: unit price of power is relative to the importance C of transmission range _c:L=2, unit price of power is relative to the importance C of the impact of environment _c:E=3, transmission range is relative to the importance C of the impact of environment _l:E=2;

Table 1

Scale	Implication
		1	Represent that two factors are compared, there is no less important
3	Represent that two factors are compared, a factor is more important a little than another factor
		5	Represent that two factors are compared, a factor is obviously more important than another factor
7	Represent that two factors are compared, a factor is strongly more important than another factor
		9	Represent that two factors are compared, a factor is extremely more important than another factor
2，4，6，8	The intermediate value of above-mentioned two adjacent judgements
		Reciprocal	The judgement a that factor i and j compares ij, then the judgement a that compares of factor j and i ji=1/a ij

Step 5.2 and according to above-mentioned three between two between importance relation set up three row three column matrix;

${\mathrm{\ω}}_1=\left[\begin{array}{ccc}{C}_{C:C}& C_{C:L}& C_{C:E}\\ C_{L:C}& C_{L:L}& C_{L:E}\\ C_{E:C}& C_{E:L}& C_{E:E}\end{array}\right]=\left[\begin{array}{ccc}1& 2& 3\\ 1/2& 1& 2\\ 1/3& 1/2& 1\end{array}\right]---\left(9\right)$

Step 5.3, determine the relation of six described factors importance between any two;

Frequency departure is relative to the importance C of power factor inverse _{Δ f:1/ α}=3, frequency departure is relative to the importance C of voltage fluctuation _{Δ f: Δ V}=4, frequency departure is relative to the importance C of voltage deviation _{Δ f: Δ U}=5, frequency departure is relative to the importance of tri-phase unbalance factor frequency departure is relative to the importance of voltage distortion rate the power factor importance relative to voltage distortion rate reciprocal the power factor importance C relative to voltage fluctuation reciprocal _{1/ α: Δ V}=2, the power factor importance C relative to voltage deviation reciprocal _{1/ α: Δ U}=3, the power factor importance relative to tri-phase unbalance factor reciprocal voltage fluctuation is relative to the importance C of voltage deviation _{Δ V: Δ U}=2, voltage fluctuation is relative to the importance of tri-phase unbalance factor voltage deviation is relative to the importance of tri-phase unbalance factor

Step 5.4 and according to above-mentioned six between two between importance relation set up six row six column matrix;

${\mathrm{\ω}}_2=\left[\begin{array}{c}{C}_{1/\mathrm{\α}:1/\mathrm{\α}}{C}_{1/\mathrm{\α}:\mathrm{\ΔV}}{C}_{1/\mathrm{\α}:\mathrm{\ΔU}}{C}_{1/\mathrm{\Δ}:\mathrm{\Δf}}{C}_{1/\mathrm{\α}:{\mathrm{\ϵ}}_u}{C}_{1/\mathrm{\α}:U_{\mathrm{THD}}}\\ C_{\mathrm{\ΔV}:1/\mathrm{\α}}{C}_{\mathrm{\ΔV}:\mathrm{\ΔV}}{C}_{\mathrm{\ΔV}:\mathrm{\ΔU}}{C}_{\mathrm{\ΔV}:\mathrm{\Δf}}{C}_{\mathrm{\ΔV}:{\mathrm{\ϵ}}_u}{C}_{\mathrm{\ΔV}:U_{\mathrm{THD}}}\\ C_{\mathrm{\ΔU}:1/\mathrm{\α}}{C}_{\mathrm{\ΔU}:\mathrm{\ΔV}}{C}_{\mathrm{\ΔU}:\mathrm{\ΔU}}{C}_{\mathrm{\ΔU}:\mathrm{\Δf}}{C}_{\mathrm{\ΔU}:{\mathrm{\ϵ}}_u}{C}_{\mathrm{\ΔU}:U_{\mathrm{THD}}}\\ C_{\mathrm{\Δf}:1/\mathrm{\α}}{C}_{\mathrm{\Δf}:\mathrm{\ΔV}}{C}_{\mathrm{\Δf}:\mathrm{\ΔU}}{C}_{\mathrm{\Δf}:\mathrm{\Δf}}{C}_{\mathrm{\Δf}:{\mathrm{\ϵ}}_u}{C}_{\mathrm{\Δf}:U_{\mathrm{THD}}}\\ C_{{\mathrm{\ϵ}}_u:1/\mathrm{\α}}{C}_{{\mathrm{\ϵ}}_u:\mathrm{\ΔV}}{C}_{{\mathrm{\ϵ}}_u:\mathrm{\ΔU}}{C}_{{\mathrm{\ϵ}}_u:\mathrm{\Δf}}{C}_{{\mathrm{\ϵ}}_u:{\mathrm{\ϵ}}_u}{C}_{{\mathrm{\ϵ}}_u:U_{\mathrm{THD}}}\\ C_{U_{\mathrm{THD}}:1/\mathrm{\α}}{C}_{U_{\mathrm{THD}}:\mathrm{\ΔV}}{C}_{U_{\mathrm{THD}}:\mathrm{\ΔU}}{C}_{U_{\mathrm{THD}}:\mathrm{\Δf}}{C}_{U_{\mathrm{THD}}:{\mathrm{\ϵ}}_u}{C}_{U_{\mathrm{THD}}:U_{\mathrm{THD}}}\end{array}\right]=\left[\begin{array}{cccccc}1& 2& 3& 1/3& 4& 1\\ 1/2& 1& 2& 1/4& 3& 1/2\\ 1/3& 1/2& 1& 1/5& 2& 1/3\\ 3& 4& 5& 1& 6& 3\\ 1/4& 1/3& 1/2& 1/6& 1& 1/4\\ 1& 2& 3& 1/3& 4& 1\end{array}\right]---\left(10\right)$

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 two matrix Maximum characteristic root,

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 ₁,μ ₂,μ ₃]=1/10[0.8468,0.4660,0.2565]=[0.0847,0.0466,0.0257]

β=[β ₁,β ₂,β ₃,β ₄,β ₅,β ₆]=[0.3557,0.2146,0.1343,0.8216,0.0888,0.3557]；

Get n=1, $F=X\·\mathrm{\μ}+\frac{1}{n}\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{Y}_k\·\mathrm{\β}=\left[\mathrm{0.5,2,2.67}\right]\×\left[\mathrm{0.0847,0.0466,0.0257}\right]+$ $\left[\mathrm{1.04,0.03,0.04,0.02,0.01,0.05}\right]\×\left[\mathrm{0.3557,0.2146,0.1343,0.8216,0.0888,0.3557}\right]$ $0.2042+0.4168=0.6210$

Namely this system F value is; 0.6210.

Step 6: display and print module display performance data and histogram, and print data form and judged result;

Described display and print module comprise liquid crystal display and printer, are connected with DSP processing enter, and display is used for the various performance parameter historical data of display, and printer prints analysis result and new-energy grid-connected application form in table form;

Printer prints new-energy grid-connected application form, and main contents comprise:

1) generation of electricity by new energy type, responsible institution, unit character;

2) unit price of power, transmission range, environmental influence value;

3) three-phase alternating voltage, three-phase alternating current, active power, power factor;

4) voltage deviation, voltage fluctuation, non-equilibrium among three phase voltages, 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, reports result;

Step 8: if Comprehensive Assessment result is less than historical record evaluation result, then dispatching center sends the instruction of replacing generation of electricity by new energy unit and carrying out;

The replacement concrete grammar of described grid-connected power generation system is density analogy method, use computing machine programming realization, F is analogous to the density in physics, electricity Q analogy total needed for electrical network is become the volume V of fixed volume, in order to realize following function: meet the grid-connected power generation system of grid-connected conditions to each systems generate electricity amount summation and each systematic name is pressed F value arrangement, F value large under, F value little upper, if there is new electricity generation system, F value is less than original maximum F value, then the system that F value is maximum is oozed out from below, new system add from top still by F value arrange, until namely V fills, and what can ensure 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 whether F is less than the maximal value of existing system F, if then perform step 8.3, otherwise, perform step 8.5;

Step 8.3: the electricity generation system replacing F value maximum by this electricity generation system;

Step 8.4: judge now whether gross generation meets electrical network needs, if then perform step 8.5, otherwise performs step 8.1;

Step 8.5: terminate.

Step 9: connect other generation of electricity by new energy units, repeats step 1 ~ 8.

This system detects multiple generation of electricity by new energy unit, according to the scoring height of each genset, selects the genset being more suitable for grid-connected application.

Claims (3)

1. the grid-connected Intelligent Measurement alarm method of grid-connected power generation system, the method adopts the grid-connected Intelligent Measurement warning device of grid-connected power generation system, and this device comprises: current sensor: for gathering the three-phase current signal of inverter output end in electrical network, the standard three-phase current signal of grid disruption road device output terminal and frequency signal, voltage sensor: for gathering the three-phase voltage signal of inverter output end in electrical network, the standard three-phase voltage signal of grid disruption road device output terminal and frequency signal, also comprise DSP processing enter module and warning device, wherein, described warning device: for the DC current signal of the generation of electricity by new energy unit according to collection acquisition, 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 grid disruption road device output terminal, the standard three-phase voltage signal of grid disruption road device output terminal and standard-frequency signal eight data of grid disruption road device output terminal, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate six factors, if above-mentioned six factors are not all in respective setting range, then report to the police, described DSP processing enter module: six factors, unit price of power, genset for calculating according to warning device calculate this genset of reaction to the transmission range of electrical network, environmental influence value and important coefficient and whether be applicable to grid-connected Comprehensive Assessment result, it is characterized in that: method comprises the following steps:

Step 1: adopt 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 a current sensor to gather the three-phase alternating current signal of inverter output end in electrical network, adopt a voltage sensor to gather the three-phase alternating voltage signal of inverter output end in electrical network, and frequency acquisition signal; Adopt another current sensor to gather the standard three-phase alternating current signal of grid disruption road device output terminal, adopt another voltage sensor to gather the standard three-phase alternating voltage signal of grid disruption road device output terminal, and gather standard-frequency signal;

Step 2: the signal gathered in step 1 is sent in signal processing circuit and carries out filtering process, and open traffic pilot, A/D conversion is carried out to signal;

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 standard-frequency signal eight data after A/D conversion, calculate and obtain power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate six factors, and judge above-mentioned six factors whether in setting range, if all in scope, then perform step 5, otherwise perform step 4; If alarm breaks down, be then sent to dispatching center by DSP processing enter module and make whether grid-connected judgement;

Step 4: alarm apparatus sends signal and controls isolating switch, this generation of electricity by new energy unit and electrical network is disconnected, and reports to the police;

Six factors that step 5:DSP processing enter module calculates according to warning device, unit price of power, genset are to the transmission range of electrical network, environmental influence value and important coefficient, calculate this genset of reaction and whether be applicable to grid-connected Comprehensive Assessment result, all signals and analysis result are stored;

Six factors that described DSP processing enter module calculates according to warning device, unit price of power, genset calculate the Comprehensive Assessment result of electricity generation system to the transmission range of electrical network, environmental influence value and important coefficient, comprise following formula:

$F=X\·\mathrm{\μ}+\frac{1}{n}\underset{k=1}{\overset{n}{\mathrm{\Σ}}}{Y}_k\·\mathrm{\β}$

Wherein: F is Comprehensive Assessment result;

X＝[C，L，E]，Y＝[1/α，ΔV，ΔU，Δf，ε _u，U _THD]，

μ＝[μ ₁，μ ₂，μ ₃]，β＝[β ₁，β ₂，β ₃，β ₄，β ₅，β ₆]

C is 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 environmental pollution indexes, W ₂for power generation project builds up rear this area environmental pollution indexes; 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 voltage distortion rate; μ matrix is the important coefficient matrix of X matrix; β matrix is the important coefficient matrix of Y matrix; Wherein, μ ₁for the important coefficient of C; μ ₂for the important coefficient of L; μ ₃for the important coefficient of E; β ₁it is the important coefficient of 1/ α; β ₂for the important coefficient of Δ V; β ₃for the important coefficient of Δ U; β ₄for the important coefficient of Δ f; β ₅for ε _uimportant coefficient; β ₆for U _tHDimportant coefficient;

Step 6: display 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, reports result;

Step 8: if Comprehensive Assessment result is less than historical record evaluation result, then dispatching center sends the instruction of replacing genset and carrying out;

Step 9: connect other generation of electricity by new energy units, repeats step 1 ~ 8.

2. detection alarm method according to claim 1, is characterized in that: the setting range of six factors described in step 3 is: power factor scope is-0.95 ~ 0.95; Voltage deviation is-10% ~ 7%; Voltage fluctuation is less than or equal to 3%; Tri-phase unbalance factor is less than or equal to 2%; Frequency departure scope is-0.5 ~ 0.2Hz; Voltage distortion rate is less than or equal to 5%.

3. detection alarm method according to claim 1, it is characterized in that: the determination mode of described μ matrix and β matrix: adopt AHP analytical hierarchy process to determine the relation of in the evaluation process of generation of electricity by new energy unit unit price of power C, the genset transmission range L to electrical network and the influence value E to environment importance between any two, and according to unit price of power C, the genset transmission range L to electrical network and the influence value E to environment between two between importance relation set up three row three column matrix; Determine the relation of described power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate importance between any two, and according to power factor, voltage deviation, voltage fluctuation, tri-phase unbalance factor, frequency departure and voltage distortion rate between two between importance relation set up six row six column matrix; Solve the proper vector of the Maximum characteristic root of above-mentioned three row three column matrix and six row six column matrix, namely obtain μ matrix and β matrix.