CN104991601A - Photovoltaic generating control system and control method for comprehensive tunnel - Google Patents
Photovoltaic generating control system and control method for comprehensive tunnel Download PDFInfo
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- CN104991601A CN104991601A CN201510434741.5A CN201510434741A CN104991601A CN 104991601 A CN104991601 A CN 104991601A CN 201510434741 A CN201510434741 A CN 201510434741A CN 104991601 A CN104991601 A CN 104991601A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a photovoltaic generating control system and control method for a comprehensive tunnel. The photovoltaic generating control system comprises at least one photovoltaic board, the photovoltaic board is connected with a bus through a maximum power track and control circuit, the bus is provided with a plurality of battery which are connected in parallel, and the bus is connected with a load through an inverter. The photovoltaic board is connected with a voltage detection circuit and a current detection circuit, and the voltage detection circuit and the current detection circuit are respectively connected with a controller. The maximum power track and control circuit comprises a protection circuit, a filtering circuit and a Boost converter which are connected in order, the protection circuit is connected with the photovoltaic board, and the Boost converter is connected with the bus. The invention further provides a high-efficient maximum power track and control method. The method is quick in search speed, and high in stability precision. A large step length is automatically adopted when the maximum power point is far away, the search speed can be accelerated, and a small step length is adopted when the maximum power point is close, so the power loss can be reduced.
Description
Technical field
The present invention relates to a kind of pipe gallery photovoltaic power generation control system and control method.
Background technology
Pipe gallery refers to scientific and reasonable being contained in a underground pipe gallery such as multiple pipeline such as electric power, light current, feedwater, heating power.Pipe gallery because of the efficiency utilization to the underground space, avoid road repeatedly to excavate, be convenient to the advantages such as later maintenance, day by day come into one's own.
Photovoltaic generation is a kind of clean, efficient, continuable novel energy.Photovoltaic generation is utilized to power will have following good effect to underground pipe gallery:
1. the consumers such as illumination, power, water pump are installed in piping lane.At present, it is utilize the buried-pipe laying of 10KV high voltage cable to piping lane distribution substation that pipe gallery is powered, then powers to piping lane through piping lane distribution substation.Utilize photovoltaic generation to power, 10KV cable can be save and lay investment, reducing the construction costs.
2. photovoltaic generation is sustainable, renewable, in the long term, utilizes photovoltaic generation to power and can reduce the maintenance cost of piping lane.
3. photovoltaic generation can produce good ecological benefits.
In existing photovoltaic generation power supply technique, remain in following problem:
1. existing maximum power tracing control technology mainly contains climbing method, disturbance observation, fuzzy control, ANN (Artificial Neural Network) Control etc.Hill-climbing algorithm because of simple, be easy to realize, more in photovoltaic generation applications.But existing hill-climbing algorithm has the following disadvantages: hill-climbing algorithm step-size in search is fixing.If step-size in search setting is comparatively large, at maximum power point place, easily there is concussion, form photovoltaic power loss; If step-size in search setting is less, search by hill climbing speed is comparatively slow, and it is less to catch power.
2., when multiple accumulator series connection uses, because each accumulator internal resistance is inconsistent, the battery discharging easily had is many, and some battery discharging is few.Accumulator whole utilization efficiency is low.In prior art, the research multiple accumulator being coordinated to electric discharge is not yet applied.
Summary of the invention
For solving the deficiency that prior art exists, the invention discloses a kind of pipe gallery photovoltaic power generation control system and control method, the system improve a kind of photovoltaic maximum power Tracing Control strategy, and propose a kind of many accumulators and work in coordination with control of discharge strategy.It is fast that maximum power tracing control method has search speed, the advantage that stable state accuracy is high.When away from maximum power point, automatically adopt larger step-length, accelerate search speed, when near maximum power point, adopt less step-length, reduce power loss.
For achieving the above object, concrete scheme of the present invention is as follows:
A kind of pipe gallery photovoltaic power generation control system, comprises at least one photovoltaic panel, and described photovoltaic panel is connected with bus by maximum power tracing control circuit, and bus is parallel with multiple accumulator, bus is also connected with load by inverter; Described photovoltaic panel is also connected with voltage detecting circuit and current detection circuit respectively, voltage detecting circuit and current detection circuit are connected with controller respectively, controller is connected with maximum power tracing control circuit, described maximum power tracing control circuit comprises the protection circuit, filtering circuit, the Boost that are connected successively, protection circuit is connected with photovoltaic panel, and Boost is connected with bus;
Described controller regulates Boost dutycycle according to photovoltaic panel output voltage, output current, follows the tracks of the output voltage of the subsequent time that photovoltaic panel exports, and the maximum power tracing realizing photovoltaic panel controls.
Also be in series with battery charge-discharge control circuit between described bus and accumulator, described battery charge-discharge control circuit comprises BUCK/BOOST transducer, and BUCK/BOOST transducer is connected with accumulator by fuse.
Described controller is computational load power and photovoltaic panel power difference first, according to the residual capacity SOC of this mathematic interpolation accumulator, determine battery discharging speed by residual capacity SOC, passing ratio integration control, regulate BUCK-BOOST transducer dutycycle, and then regulate accumulator cell charging and discharging electric current.
Described protection circuit comprises the fuse be connected with photovoltaic panel, and fuse is connected with voltage dependent resistor (VDR), and voltage dependent resistor (VDR) and photovoltaic panel are in parallel; Described filtering circuit comprises the electric capacity and polar capacitor that are in parallel; Boost comprises the thyristor, electric capacity and the polar capacitor that are in parallel, and described thyristor is also connected with inductance and diode.
The thyristor groups that described 2nd DC/DC transducer comprises polar capacitor and is in parallel with this electric capacity, described thyristor groups is two thyristors be in series, and the circuit between two thyristors is also connected with inductance, and inductance and fuse are in series.
Described voltage detecting circuit comprises the resistance pressure-dividing network circuit be connected successively, buffer circuit, emitter follower circuit and level lifting circuit and low-pass filter circuit, measured signal is decayed to dsp controller and is applicable to scope and is sent to buffer circuit by described resistance pressure-dividing network, buffer circuit is connected with emitter follower circuit for blocking measured signal to the interference of DSP microcontroller, emitter follower circuit is for improving input impedance, reduce output impedance,-3v ~+3v signal is converted to 0 ~ 3v by level lifting circuit, to adapt to DSP port tolerance range, low-pass filter circuit is for eliminating the high frequency interference of measured signal and being connected with controller.
Described current detection circuit comprises the current collection circuit, emitter follower circuit, level lifting circuit, reverse amplification circuit, the port protection circuit that connect successively; current collection circuit is for extracting tested current signal; emitter follower circuit is for improving the extractability of late-class circuit to measured signal; level lifting circuit is used for scope measured signal being raised to DSP adaptation; port protection circuit, for the protection of DSP analog input pin, prevents superpotential from occurring.
A kind of pipe gallery photovoltaic electricity-generating control method, comprising: photovoltaic maximum power Tracing Control step; When realizing photovoltaic maximum power and following the trail of, concrete steps comprise:
Step one: the output voltage and the output current that first gather photovoltaic panel, obtain the output power of photovoltaic panel, according to the ratio slope calculations S of output power difference and output voltage difference and according to slope determination step-size in search; When determining step-size in search, first according to slope, the relation curve of photovoltaic panel output power and output voltage is carried out partition, and the district residing for judging according to the photovoltaic panel slope of reality, each district is provided with corresponding step-length;
Step 2: after determining subsequent time step-size in search, utilize search by hill climbing, determines the direction of search; During search by hill climbing, first compare the output power size of the current output power of photovoltaic panel and a upper moment photovoltaic panel, if the current output power of photovoltaic panel is greater than the output power of a moment photovoltaic panel, then proceed to step 3; Otherwise, proceed to step 4;
Step 3: the output voltage size comparing the current output voltage of photovoltaic panel and a upper moment photovoltaic panel, if the current output voltage of photovoltaic panel is greater than the output voltage of a moment photovoltaic panel, the voltage that then output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time adds the step-length of setting, otherwise the voltage that the output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time deducts the step-length of setting;
Step 4: the output voltage size comparing the current output voltage of photovoltaic panel and a upper moment photovoltaic panel, if the current output voltage of photovoltaic panel is greater than the output voltage of a moment photovoltaic panel, the voltage that then output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time deducts the step-length of setting, otherwise the voltage that the output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time adds the step-length of setting;
Step 5: controller regulates Boost dutycycle, follows the tracks of the output reference voltage of photovoltaic panel subsequent time, and the maximum power tracing realizing photovoltaic panel controls.
In described step one, definition slope S is:
Wherein, S represents the absolute value of slope, represents the ratio of power difference and voltage difference, and P (k) is the output power in photovoltaic panel current K moment, the output power in P (k-1) photovoltaic panel current K-1 moment, V
dcthe output voltage in (k) photovoltaic panel current K moment, V
dc(k-1) output voltage in photovoltaic panel current K-1 moment.
During according to slope determination step-size in search, first according to the relation curve of photovoltaic panel output power and output voltage, this curve is divided into three districts from top to bottom, when slope S is less than setting value K1, it is 1st district, when slope S is greater than setting value K2, be 3rd district, slope S is greater than setting value K1 when being less than setting value K2, is 2nd district;
By slope calculations, system is when 3rd district, and away from maximum power point MPP, slope S is comparatively large, now should adopt larger step-length, and accelerate search speed, step-size in search is set to C3;
By slope calculations, system is when 2nd district, and near maximum power point, but do not reach MPP point, S is moderate, now should adopt moderate step-length, arrive MPP as early as possible, and catch more power, step-size in search is set to C2;
By slope calculations, system is when 1st district, and now near MPP point, for reducing system concussion, now should adopt less step-size in search, step-size in search is set to C1; C1<C2<C3.
A kind of pipe gallery photovoltaic electricity-generating control method, also comprise the step that control of discharge worked in coordination with by many accumulators, the specific implementation step that electric discharge worked in coordination with by accumulator is:
A. computational load power and photovoltaic panel power difference;
e(k)＝P
load(k)-P
pv(k)
B. controller detects the residual capacity SOC of each accumulator, and residual capacity is estimated by accumulator voltage;
C. battery discharging speed F (SOC) is determined by residual capacity SOC;
D. carry out adjustment by proportional integral and produce pwm signal, determine that accumulator controls electric current, realize closed loop PI and control.
Residual capacity specific formula for calculation is:
In formula, the operating voltage range that [U1, U2] is accumulator, can obtain from accumulator parameter handbook, is known numeric value, and V is accumulator voltage, can be obtained by voltage detecting circuit.
Depth of discharge control function:
Proportional integral PI controls specific formula for calculation:
In formula, u (k) is for exporting controlled quentity controlled variable, i.e. dutycycle size, K
pfor proportionality constant, K
ifor integration constant.
Beneficial effect of the present invention:
1. the present invention devises a kind of maximum power tracing control method efficiently.It is fast that the method has search speed, the advantage that stable state accuracy is high.When away from maximum power point, automatically adopt larger step-length, accelerate search speed, when near maximum power point, adopt less step-length, reduce power loss.
2. present invention improves over a kind of maximum power tracing control circuit.Hardware circuit is made up of photovoltaic panel, protection circuit, filtering circuit, BOOST converter.Protection circuit makes photovoltaic panel when there is superpotential, excess current, excises rapidly, protection photovoltaic panel.Filtering circuit can the high frequency interference composition of filtering voltage.BOOST converter achieves maximum power tracing and controls.Regulate the dutycycle of BOOST, i.e. adjustable photovoltaic panel output voltage, thus realize maximum power tracing.
3. improve photovoltaic generation topological structure, devise a kind of many accumulators collaborative management method.Whole control method is that closed loop PI controls.Achieve stable state floating, improve control accuracy.Consider the impact of residual capacity F (soc) simultaneously, achieve the collaborative control of discharge of multiple accumulator.The unified coordination battery discharging degree of depth, makes multiple accumulator synchronously reach depth of discharge, improves accumulator capacity utilization factor, extend service time.
4. devise a kind of high-precision voltage detecting circuit.Voltage detecting circuit is made up of resistance pressure-dividing network, buffer circuit, emitter following, level lifting, low-pass filtering.Measured signal is decayed to dsp controller and is applicable to scope by resistance pressure-dividing network.Buffer circuit is for blocking the interference of measured signal to DSP microcontroller.Design follower, for improving input impedance, reduces output impedance.-3v ~+3v signal is converted to 0 ~ 3v by level lifting circuit.To adapt to DSP port tolerance range.Low-pass filter circuit is for eliminating the high frequency interference of measured signal.
Accompanying drawing explanation
Fig. 1 a-Fig. 1 b photovoltaic power generation control system overall construction drawing;
Fig. 2 photovoltaic power generation control system general hardware circuit diagram;
Fig. 3 photovoltaic panel output power and output voltage relation curve;
Fig. 4 solar panel MPPT circuit diagram;
Fig. 5 maximum power tracing algorithm flow chart;
Fig. 6 present stage photovoltaic generation topological structure;
The topological structure that Fig. 7 the present invention proposes;
Fig. 8 improves front battery discharging degree of depth schematic diagram;
Fig. 9 improves rear battery discharging severity control schematic diagram;
Figure 10 Residual capacity prediction curve;
Figure 11 depth of discharge control function;
Figure 12 accumulator control structure figure;
Figure 13 electric power storage charge-discharge control circuit;
Figure 14 voltage detecting circuit;
Figure 15 current detection circuit.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail:
Photovoltaic power generation control system general structure, as shown in Fig. 1 a-Fig. 1 b, is made up of photovoltaic panel, DC/DC transducer, accumulator, inverter, dsp controller and load.Photovoltaic panel is used for catching sun power.DC/DC transducer realizes maximum energy capture and controls.Accumulator stores photovoltaic by day, and night powers to the load.The general hardware circuit of photovoltaic power generation control system as shown in Figure 2.Dsp controller is the dutycycle being regulated BOOST converter and BUCK-BOOST transducer by output pwm signal, thus achieves maximum power tracing control, accumulator cell charging and discharging control.
Adopt maximum power tracing strategy, system can be made to catch more sun power by day, thus extend load power-on time at night.The present invention devises a kind of rapid dynamic response speed, maximum power tracing control method that stable state accuracy is good.
The relation curve of photovoltaic panel output power and output voltage as shown in Figure 3.Photovoltaic panel, at maximum power point MPP place, catches maximum sun power.Maximum power tracing will make system cloud gray model at MPP point exactly, thus catches more photoelectricity.
First, defining slope S is:
S represents the absolute value of slope, represents the ratio of power difference and voltage difference.By judging the size of S, the state residing for photovoltaic generation can be known.
As shown in Figure 3, system is when 3rd district, comparatively large away from maximum power point MPP, S, now should adopt larger step-length, accelerate search speed.(step-size in search is set to C3)
System is when 2nd district, and near maximum power point, but do not reach MPP point, S is moderate, now should adopt moderate step-length, arrive MPP as early as possible, catches more power.(step-size in search is set to C2)
System, when 1st district, now near MPP point, for reducing system concussion, now should adopt less step-size in search.(step-size in search is set to C1)
Specific implementation:
The first step, first gathers the output voltage of photovoltaic panel, output current, slope calculations S.Judge to adopt which kind of step-size in search by the size of S again.
Second step, after knowing subsequent time step-size in search, utilizes search by hill climbing, determines the direction of search.
Search by hill climbing computation process is:
ΔP＝P(k)-P(k-1)
ΔV
dc＝V
dc(k)-V
dc(k-1)
V
dc(k+1)＝V
dc(k)+sgn(ΔP)·sgn(ΔV
dc)·ΔC
In formula, sgn is sign function.
Finally, regulate Boost dutycycle, follow the tracks of Vdc (k+1), the maximum power tracing realizing photovoltaic panel controls.Maximum power tracing software simulating is shown in Fig. 5.
Maximum power tracing hardware circuit realizes as shown in Figure 4.Hardware circuit is made up of photovoltaic panel, protection circuit, filtering circuit, BOOST converter.Protection circuit makes photovoltaic panel when there is superpotential, excess current, excises rapidly, protection photovoltaic panel.Filtering circuit is used for the radio-frequency component of filtering voltage.BOOST converter is used for realizing maximum power tracing and controls.Regulate the dutycycle of mosfet Q3, i.e. adjustable photovoltaic panel output voltage, thus realize maximum power tracing.
Present stage, topological structure shown in photovoltaic generation many employings Fig. 6.A load is equipped with one piece of photovoltaic panel, one piece of accumulator.In this topological structure mode, each accumulator is independently, not contact mutually.
Consider following factor:
1) photovoltaic panel installation position is different, and catch photoelectricity difference, the energy of accumulators store is also different.
2) accumulator is when dispatching from the factory, and is difficult to ensure that internal resistance is consistent.
Therefore, when multiple accumulator serial or parallel connection uses, different battery discharging situations is not quite similar.Likely occur problem as shown in Figure 8, namely 1# accumulator (BAT1) residual capacity is large, and discharge time is long, institute's bringing onto load longevity of service.And 3# accumulator (BAT3) residual capacity is little, discharge time is short, and institute's bringing onto load working time is short.
Cause each load supplying Time Inconsistency, have impact on overall result of use.
For solving the problem, present invention improves over the topological structure of accumulator, multiple accumulator is parallel on DC bus by DC/DC transducer.(for ease of illustrating, the present invention is for three accumulators)
As shown in Figure 7, the direct current that photovoltaic panel exports, after Boost, converges on DC bus, and load and corresponding accumulator are all articulated on DC bus.
During daytime, photovoltaic panel all adopts maximum power tracing strategy, makes the common stored energy of all accumulators.Overcome in the past due to installation site reason, likely certain charge in batteries is many, and other accumulators deposit electricity less, the problem that solar photovoltaic utilization is insufficient.
During night, accumulator 1#, 2#, 3#, according to self residual capacity, coordinate electric discharge.
That is, the battery discharging that battery discharging is many, residual capacity is little that residual capacity is large is few, and all accumulators finally reach depth of discharge jointly, both ensure that load normally uses, has taken full advantage of accumulator capacity again.Battery discharging after improvement controls
As shown in Figure 9.
The specific implementation of electric discharge worked in coordination with by accumulator:
1) computational load power P load and photovoltaic panel power P pv difference.
2) the residual capacity SOC of each accumulator is detected.Residual capacity is estimated by accumulator voltage.
As shown in Figure 10, residual capacity specific formula for calculation is residual capacity estimation curve:
In formula, the operating voltage range that [U1, U2] is accumulator.Can obtain from accumulator parameter handbook, be known numeric value.
3) battery discharging speed F (SOC) is determined by residual capacity SOC.Discharge rate function as shown in figure 11.
4) by proportional plus integral control PI, determine that accumulator controls electric current.Accumulator works in coordination with the overall construction drawing of control of discharge as shown in figure 12.Whole control is that closed loop PI controls.Achieve stable state floating, improve control accuracy.Consider the impact of residual capacity F (soc) simultaneously, achieve the collaborative control of discharge of multiple accumulator.
The collaborative control of discharge essence of accumulator is that a PI closed loop adjustment controls.
The first step that PI controls wants calculation deviation;
Second step, according to deviation by PI computing formula:
Calculate controlled quentity controlled variable, controlled quentity controlled variable is the dutycycle of buck boost transducer.
3rd step, according to the dutycycle calculated, regulates BUCKboost circuit, realizes charge and discharge control.
As shown in figure 13, accumulator charging/discharging circuit figure, accumulator charging/discharging circuit is by DC/DC transducer, fuse, and accumulator is formed.DC/DC transducer is used for charging, the control of discharge of accumulator.Fuse, for the protection of accumulator, avoids excess current to endanger.
As shown in figure 14, voltage detecting circuit figure, voltage detecting circuit is made up of resistance pressure-dividing network, buffer circuit, emitter following, level lifting, low-pass filtering.Measured signal is decayed to dsp controller and is applicable to scope by resistance pressure-dividing network.Buffer circuit is for blocking the interference of measured signal to DSP microcontroller.Design follower, for improving input impedance, reduces output impedance.-3v ~+3v signal is converted to 0 ~ 3v by level lifting circuit.To adapt to DSP port tolerance range.Low-pass filter circuit is for eliminating the high frequency interference of measured signal.
As shown in figure 15, current detection circuit figure, current detection circuit is made up of current acquisition, emitter following, level lifting, oppositely amplification, port protection.Current collection circuit is for extracting tested current signal.Emitter following is for improving the extractability of late-class circuit to measured signal.Level lifting is used for scope measured signal being raised to DSP adaptation.Port protection, for the protection of DSP analog input pin, prevents superpotential from occurring.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (10)
1. a pipe gallery photovoltaic power generation control system, is characterized in that, comprises at least one photovoltaic panel, and described photovoltaic panel is connected with bus by maximum power tracing control circuit, and bus is parallel with multiple accumulator, bus is also connected with load by inverter; Described photovoltaic panel is also connected with voltage detecting circuit and current detection circuit respectively, voltage detecting circuit and current detection circuit are connected with controller respectively, controller is connected with maximum power tracing control circuit, described maximum power tracing control circuit comprises the protection circuit, filtering circuit, the Boost that are connected successively, protection circuit is connected with photovoltaic panel, and Boost is connected with bus;
Described controller regulates Boost dutycycle according to photovoltaic panel output voltage, output current, follows the tracks of the output voltage of the subsequent time that photovoltaic panel exports, and the maximum power tracing realizing photovoltaic panel controls.
2. a kind of pipe gallery photovoltaic power generation control system as claimed in claim 1, it is characterized in that, also battery charge-discharge control circuit is in series with between described bus and accumulator, described battery charge-discharge control circuit comprises BUCK/BOOST transducer, and BUCK/BOOST transducer is connected with accumulator by fuse;
Described controller is computational load power and photovoltaic panel power difference first, according to the residual capacity SOC of this mathematic interpolation accumulator, determine battery discharging speed by residual capacity SOC, passing ratio integration control, regulate BUCK-BOOST transducer dutycycle, and then regulate accumulator cell charging and discharging electric current.
3. a kind of pipe gallery photovoltaic power generation control system as claimed in claim 1, it is characterized in that, described protection circuit comprises the fuse be connected with photovoltaic panel, and fuse is connected with variable resistor, and variable resistor and photovoltaic panel are in parallel; Described filtering circuit comprises the electric capacity and polar capacitor that are in parallel; Boost comprises the thyristor, electric capacity and the polar capacitor that are in parallel, and described thyristor is also connected with inductance and diode;
The thyristor groups that described 2nd DC/DC transducer comprises polar capacitor and is in parallel with this electric capacity, described thyristor groups is two thyristors be in series, and the circuit between two thyristors is also connected with inductance, and inductance and fuse are in series.
4. a kind of pipe gallery photovoltaic power generation control system as claimed in claim 1, it is characterized in that, described voltage detecting circuit comprises the resistance pressure-dividing network circuit be connected successively, buffer circuit, emitter follower circuit and level lifting circuit and low-pass filter circuit, measured signal is decayed to dsp controller and is applicable to scope and is sent to buffer circuit by described resistance pressure-dividing network, buffer circuit is connected with emitter follower circuit for blocking measured signal to the interference of DSP microcontroller, emitter follower circuit is for improving input impedance, reduce output impedance,-3v ~+3v signal is converted to 0 ~ 3v by level lifting circuit, to adapt to DSP port tolerance range, low-pass filter circuit is for eliminating the high frequency interference of measured signal and being connected with controller.
5. a kind of pipe gallery photovoltaic power generation control system as claimed in claim 1; it is characterized in that; described current detection circuit comprises the current collection circuit, emitter follower circuit, level lifting circuit, reverse amplification circuit, the port protection circuit that connect successively; current collection circuit is for extracting tested current signal; emitter follower circuit is for improving the extractability of late-class circuit to measured signal; level lifting circuit is used for scope measured signal being raised to DSP adaptation; port protection circuit, for the protection of DSP analog input pin, prevents superpotential from occurring.
6. apply the control method of a kind of pipe gallery photovoltaic power generation control system as claimed in claim 1, it is characterized in that, comprising: photovoltaic maximum power Tracing Control step; When realizing photovoltaic maximum power and following the trail of, concrete steps comprise:
Step one: the output voltage and the output current that first gather photovoltaic panel, obtain the output power of photovoltaic panel, according to the ratio slope calculations S of output power difference and output voltage difference and according to slope determination step-size in search; When determining step-size in search, first according to slope, the relation curve of photovoltaic panel output power and output voltage is carried out partition, and the district residing for judging according to the photovoltaic panel slope of reality, each district is provided with corresponding step-length;
Step 2: after determining subsequent time step-size in search, utilize search by hill climbing, determines the direction of search; During search by hill climbing, first compare the output power size of the current output power of photovoltaic panel and a upper moment photovoltaic panel, if the current output power of photovoltaic panel is greater than the output power of a moment photovoltaic panel, then proceed to step 3; Otherwise, proceed to step 4;
Step 3: the output voltage size comparing the current output voltage of photovoltaic panel and a upper moment photovoltaic panel, if the current output voltage of photovoltaic panel is greater than the output voltage of a moment photovoltaic panel, the voltage that then output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time adds the step-length of setting, otherwise the voltage that the output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time deducts the step-length of setting;
Step 4: the output voltage size comparing the current output voltage of photovoltaic panel and a upper moment photovoltaic panel, if the current output voltage of photovoltaic panel is greater than the output voltage of a moment photovoltaic panel, the voltage that then output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time deducts the step-length of setting, otherwise the voltage that the output reference voltage of photovoltaic panel subsequent time equals photovoltaic panel current time adds the step-length of setting;
Step 5: controller regulates Boost dutycycle, follows the tracks of the output reference voltage of photovoltaic panel subsequent time, and the maximum power tracing realizing photovoltaic panel controls.
7. the control method of a kind of pipe gallery photovoltaic power generation control system as claimed in claim 6, is characterized in that, in described step one, definition slope S is:
S represents the absolute value of slope, represents the ratio of power difference and voltage difference;
During according to slope determination step-size in search, first this curve is divided into three districts from top to bottom, when slope S is less than K1 according to the relation curve of photovoltaic panel output power and output voltage, being 1st district, when slope S is greater than K2, is 3rd district,, slope S is greater than K1 when being less than K2, is 2nd district;
By slope calculations, system is when 3rd district, and away from maximum power point MPP, slope S is comparatively large, now should adopt larger step-length, and accelerate search speed, step-size in search is set to C3;
By slope calculations, system is when 2nd district, and near maximum power point, but do not reach MPP point, S is moderate, now should adopt moderate step-length, arrive MPP as early as possible, and catch more power, step-size in search is set to C2;
By slope calculations, system is when 1st district, and now near MPP point, for reducing system concussion, now should adopt less step-size in search, step-size in search is set to C1; C1<C2<C3.
8. the control method of a kind of pipe gallery photovoltaic power generation control system as claimed in claim 6, is characterized in that, also comprises the step that control of discharge worked in coordination with by many accumulators, and the specific implementation step that electric discharge worked in coordination with by accumulator is:
A. computational load power and photovoltaic panel power difference;
B. controller detects the residual capacity SOC of each accumulator, and residual capacity is estimated by accumulator voltage;
C. battery discharging speed F (SOC) is determined by residual capacity SOC;
D. carry out adjustment by proportional integral and produce pwm signal, determine that accumulator controls electric current, realize closed loop PI and control.
9. the control method of a kind of pipe gallery photovoltaic power generation control system as claimed in claim 8, it is characterized in that, residual capacity specific formula for calculation is:
In formula, the operating voltage range that [U1, U2] is accumulator, can obtain from accumulator parameter handbook, and be known numeric value, V is accumulator voltage, is obtained by voltage detecting circuit.
10. the control method of a kind of pipe gallery photovoltaic power generation control system as claimed in claim 8, is characterized in that, depth of discharge control function:
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| CN201510434741.5A CN104991601B (en) | 2015-07-22 | 2015-07-22 | A kind of pipe gallery photovoltaic power generation control system and control method |
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