CN102468755B - A kind of new energy Systematical control apparatus and control method - Google Patents
A kind of new energy Systematical control apparatus and control method Download PDFInfo
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- CN102468755B CN102468755B CN201010547202.XA CN201010547202A CN102468755B CN 102468755 B CN102468755 B CN 102468755B CN 201010547202 A CN201010547202 A CN 201010547202A CN 102468755 B CN102468755 B CN 102468755B
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Abstract
The invention discloses a kind of control device and control method thereof of new energy system, described control device comprises: boost module (1), voltage reduction module (2), diode (3), automatic switch (4), boosting driver module (5), step-down driver module (6), sampling control module (7), wherein: sampling control module (7) is respectively from the input point (A) of boost module (1), output point (B), the output point (C) of voltage reduction module gathers voltage and current signal, boosting driver module (5) is sent into after process computing, closed or the disconnection of step-down driver module (6) and control automatic switch (4), boost module (1), when the input voltage Va of input point (A) is lower than set point Vr, boosts to input voltage, when input voltage Va is higher than set point Vr, closes and do not work.The present invention can improve the utilance of DC source, improves conversion efficiency, removes formula DC source compatibility with throwing.
Description
Technical field
The present invention relates to new energy systems technology field, in particular to a kind of new energy Systematical control apparatus and control method.
Background technology
By the pressure of energy-saving and emission-reduction, communication equipment uses the new energy resources system such as solar energy, wind energy to get more and more as the application of electric power system.New energy system is that direct current input or rectifiable become direct current to input to the power supply that communication equipment provides, and below the DC power supply that new forms of energy produce is called for short " DC source ".When DC source is when accepting voltage range, be 48V or 24V or 12V battery charging by controller to nominal voltage, give communication equipment load supplying simultaneously, when DC source voltage range beyond controller tolerance interval or DC source be not enough to holding load power need time, batteries electric discharge powering load.
As shown in Figure 1, the scope of batteries charging/discharging voltage Vo is V1 ~ V3, and wherein V1 is discharge off protection voltage and charging initial voltage, and V3 is battery pack even charging voltage and starts discharge initiation voltage.The impact that DC source is subject to the attribute of DC source own and considers in online operation power supply compatibility with the past, the scope of its input voltage Vs is from V2 ~ V4, the voltage of this scope can not directly to batteries and load supplying, need to be controlled by controller or convert could by batteries and load accept.
The output characteristic of DC source is when a certain electrical voltage point, can Maximum Power Output.Controller in the past adopts to throw removes formula or general MPPT (MaxiumPowerPointTrack, MPPT maximum power point tracking) DC source is transformed into batteries and needs voltage by the boosting of mode or step-down, exists insufficient to the utilization of power of new forms of energy or conversion efficiency is low or do not mate with accumulator battery voltage or configure and owe the defect such as flexible.
Existing controller technology comprises following several scheme:
Scheme one: throw and remove formula, throwing is removed formula and (is also mode switching controller, SwitchModeController), the switch of controller is relay or power electric switch device, is that access (input) or disconnection (removing) carry out rough voltage stabilizing to the output voltage of controller by controlling one or more DC source.DC source output voltage is by battery tension clamp (ignoring switch and line drop), and therefore the output voltage of DC source cannot be operated in the voltage of maximum power point (mpp), also just cannot make full use of the power output of new forms of energy.
Scheme two: adopt single-stage boosting mode or single-stage buck mode, because the output voltage range of DC source is very wide, and controller exports the batteries required voltage connect changes also very greatly when different conditions, therefore cause controller cannot be operated in its best efficiency point or the wider voltage range (namely cannot make full use of the output of new forms of energy) of DC source cannot be met.
Scheme three: boosting and step-down mode are simply gone here and there or parallel combination, or cause the low or charging voltage demand because batteries cannot be met of conversion efficiency because there is multi-stage transformation simultaneously.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of control device and control method thereof of new energy system, the defect that utilization rate of electrical is low and controller conversion efficiency is low that the DC source for overcoming new forms of energy in prior art exists.
In order to solve the problem, the present invention proposes a kind of control device of new energy system, comprise: boost module (1), voltage reduction module (2), diode (3), automatic switch (4), boosting driver module (5), step-down driver module (6), sampling control module (7), wherein:
The output of input point (A) the external DC source of described boost module (1), is connected with the anode of diode (3), the first link of automatic switch (4) simultaneously;
The output point (B) of described boost module (1) is connected with the input of voltage reduction module (2), is connected with the negative electrode of diode (3), the second link of automatic switch (4) simultaneously;
The output point (C) of described voltage reduction module (2) is connected to batteries and communication equipment load;
Described sampling control module (7) is respectively from input point (A), the output point (B) of boost module (1), the output point (C) of voltage reduction module (2) gathers voltage and current signal, send boosting driver module (5), step-down driver module (6) and control the closed of automatic switch (4) or disconnect after process computing;
Described boosting driver module (5) is used for driving boost module (1), and described step-down driver module (6) is used for driving voltage reduction module (2);
Automatic switch 4 is: relay or contactor.
Boost module (1), for when the input voltage Va of input point (A) is lower than set point Vr, boosts to input voltage; For when input voltage Va is higher than set point Vr, closes and do not work.
Described automatic switch (4) at the input voltage Va of input point (A) higher than conducting during set point Vr, by boost module (1) short circuit.
Described diode (3) does not have conducting instantaneously to voltage reduction module (2) power supply for the automatic switch (4) when boost module (1) is closed.
Described voltage reduction module (2), for when the input voltage Va of input point (A) is higher than set point Vr, carries out step-down to the input voltage transmitted by automatic switch (4) or diode (3); Or for carrying out step-down lower than during set point Vr to the output voltage of boost module at the input voltage Va of input point (A).
Described sampling control module (7), for from input point (A) sampled input voltage of boost module (1) and input current signal, the output current that the output point (B) of boost module (1) adopts voltage signal, the output point (C) of voltage reduction module (2) samples voltage reduction module (2) and output voltage signal, according to control boosting driver module (5) after the sample electric current and/or voltage signal computing that obtain and drive boost module (1), controlled hypotension driver module (6) drives voltage reduction module (2); Send the disconnected and logical of signal controlling automatic switch (4).
The present invention also provides a kind of control method of control device of new energy system, comprising:
When sampling control module (7) detects that the input voltage Va of boost module (1) is more than or equal to setting threshold voltage Vr, automatic switch (4) closes, boost module (1) does not work, sampling control module (7) starts MPPT maximum power point tracking (MPPT) scanning by step-down driver module (6) controlled hypotension module (2), tracking is operated in DC source peak power output point, when the output voltage of controller is lower than the even charging voltage value Ve set, voltage reduction module (2) proceeds MPPT operating state.
Automatic switch (4) is: relay or contactor;
When the input voltage Va of input point (A) is lower than set point Vr, boost module 1 pair of input voltage boosts; When input voltage Va is higher than set point Vr, boost module 1 is closed and is not worked.
Described method comprises further: when the output voltage Vc of voltage reduction module (2) reaches the even charging voltage value Ve of setting, voltage reduction module (2) transfers voltage stabilizing state to by MPPT maximum power point tracking (MPPT).
Described method comprises further: when the output voltage Vc of voltage reduction module (2) reaches even charging voltage value Ve, starts timing, and after certain hour t1, transfer floating charge mode to by equal modes of filling, now output voltage Vc is reduced to float charge voltage value Vf.
Described method comprises further: when the input voltage Va of the boost module (1) that sampling control module (7) samples lower than setting threshold voltage Vr and lower voltage limit V2 higher than tolerance interval time, when the difference of the output voltage Vc of input voltage Va and boost module (2) is lower than setting voltage difference simultaneously, boost module (1) and voltage reduction module (2) all work, automatic switch (4) disconnects, diode (3) blocks, boost module (1) is operated in MPPT maximum power point tracking (MPPT) and alternately controls between control mode and voltage regulation way, voltage reduction module (2) flow-limiting voltage-stabilizing work.
The condition being operated in MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio D of voltage reduction module (2) is greater than setting dutyfactor value D1.
The condition exiting MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio of voltage reduction module (2) is less than setting dutyfactor value D2.
The present invention also provides the control method of the control device of another kind of new energy system, comprising:
When the input voltage Va of the boost module (1) that sampling control module (7) samples lower than setting threshold voltage Vr and lower voltage limit V2 higher than tolerance interval time, when the difference of the output voltage Vc of input voltage Va and voltage reduction module (2) is lower than setting voltage difference simultaneously, boost module (1) and voltage reduction module (2) all work, automatic switch (4) disconnects, diode (3) blocks, boost module (1) is operated in MPPT maximum power point tracking (MPPT) and alternately controls between control mode and voltage regulation way, voltage reduction module (2) flow-limiting voltage-stabilizing work,
Automatic switch (4) is: relay or contactor;
When the input voltage Va of input point (A) is lower than set point Vr, described boost module (1) boosts to input voltage; When input voltage Va is higher than set point Vr, described boost module (1) is closed and is not worked
.
The condition being operated in MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio D of voltage reduction module (2) is greater than setting dutyfactor value D1.
The condition exiting MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio of voltage reduction module (2) is less than setting dutyfactor value D2.
The control device of new energy system proposed by the invention and control method, during according to same DC source in wider different voltage section and in the state that storage battery is different, controller is operated in different states, the defect that utilization rate of electrical is low and controller conversion efficiency is low that the DC source that can overcome new forms of energy in prior art and method exists.Adopt control device of the present invention and method, can improve the utilance of DC source, can improve the conversion efficiency of controller itself, the DC source can removing formula mode with throwing is previously compatible, be applicable to existing communication equipment, the input direct-current source of controller configured more flexible.
Accompanying drawing explanation
Fig. 1 is DC voltage range and the batteries required voltage scope schematic diagram of new forms of energy output;
Fig. 2 is the control device schematic diagram of a kind of new energy system of the present invention;
Fig. 3 is the control method schematic diagram of the controller of a kind of new energy system of the present invention;
Fig. 4 is a kind of solar control apparatus schematic diagram of embodiment one of the present invention;
Fig. 5 is a kind of wind energy control device schematic diagram of embodiment two of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the present invention is described in further detail.
The present invention proposes a kind of control device and control method of new energy system of applicable communication, the low defect with new forms of energy electric energy cannot be made full use of for the conversion efficiency existing for existing controller and control method, institute improves and is mainly, during according to same DC source in wider different voltage section and in the state that storage battery is different, controller is made to be operated in different states.This, with previously to throw the communication new energy resources system of removing formula controller better compatible, meets the demand of power communications preferably.The utilance of DC source can be improved, the conversion efficiency of controller itself can be improved.
New energy Systematical control apparatus of the present invention, as shown in Figure 2, comprising: boost module 1, voltage reduction module 2, diode 3, automatic switch 4, boosting driver module 5, step-down driver module 6, sampling control module 7, wherein:
The output of the external DC source 10 of input point A of described boost module 1, is connected with the anode of diode 3, the first link of automatic switch 4 simultaneously;
The output point B of described boost module 1 is connected with the input of voltage reduction module 2, is connected with the negative electrode of diode 3, the second link of automatic switch 4 simultaneously;
The output point C of described voltage reduction module 2 is connected to batteries 8 and communication equipment 9 load;
Described sampling control module 7 is respectively from input point A, the output point B of boost module 1, the output point C of voltage reduction module 2 gathers voltage and current signal, send boosting driver module 5, step-down driver module 6 and control the closed of automatic switch 4 or disconnect after process computing;
Described boosting driver module 5 is used for driving boost module 1, and described step-down driver module 6 is used for driving voltage reduction module 2.
During described new energy system controller device busy shown in Fig. 2:
Described boost module 1, can boost to input voltage lower than (Vr value can be able to be established according to different environment and batteries demand) during set point Vr at the voltage Va of input point A.When input voltage Va is higher than set point, boost module 1 is closed and is not worked.Boost module 1 is controlled by boosting driver module 5 by sampling control module 7.
The input voltage of being come by automatic switch 4 or diode 3 in described voltage reduction module 2 pairs of controllers or the output voltage of boost module 1 carry out step-down, meet battery charging voltage and powering load requirement.Voltage reduction module 2 is controlled by step-down driver module 6 by sampling control module 7.
Described automatic switch 4, when input voltage is higher than set point, because conducting when boost module 1 does not work is by boost module 1 short circuit, to reduce conduction loss, improves the conversion efficiency of controller.Automatic switch 4 controls by sampling control module 7.Automatic switch 4 can be that relay or contactor or other conduction loss are low and be easy to control device.
Described diode 3 automatic switch 4 when boost module 1 is closed does not have conducting to power to voltage reduction module 2 instantaneously, avoids voltage reduction module 2 to input power down instantaneously.
Described sampling control module 7 is from the point sampling input voltage of A shown in Fig. 2 and input current signal, B point adopts voltage signal, C point sampling output current and output voltage signal, after sampling control module 7 computing, send boosting driver module 5 and step-down driver module 6, drive boost module 1 and voltage reduction module 2 respectively.Sampling control module 7 sends the disconnected and logical of signal controlling automatic switch 4 simultaneously.
As shown in Figure 3, the control method of Fig. 2 middle controller, comprises the control to following several operating state:
Operating state 1:
When controller starts, sampling control module 7 detects input voltage, when detecting that Va is more than or equal to Vr (this value environmentally condition etc. can be established), automatic switch 4 closes, boost module 1 does not work, sampling control module 7 starts MPPT scanning by step-down driver module 6 controlled hypotension module 2, follows the tracks of and is operated in DC source peak power output point;
When the output voltage of controller is lower than the even charging voltage value Ve (this value suitably sets among a small circle according to different batteries group and local climate condition) set, represent that communication equipment 9 load and storage battery 8 need the power output of controller enough large, then voltage reduction module 2 proceeds MPPT operating state.
The general principle of MPPT is in some cycles, the input voltage (i.e. the output voltage of DC source) of sampling control module 7 pairs of controllers scans within the specific limits, differentiates to the input power (i.e. the power output of DC source) of controller.Namely △ P, △ P is the step value of algorithm, and each increase △ P, judges the derivative △ P of power output, if △ P is greater than zero, show also not reach maximum power point, if be less than zero, represents that output voltage has exceeded maximum power point.Searching out null tangent position like this, is exactly maximum power point.
When controller startup work, sampling control module 7 sampled input voltage, input current, and the variable quantity △ P of rated output, if △ is P=0, this means that controller is operated in DC source peak power output point, just without the need to adjustment.If △ P ≠ 0, represent that controller is not also operated in the peak power output point of DC source, need to change its operating voltage point, quiescent potential is heightened or is reduced and depends on current variation tendency, if U* (dI)+I* (dU) < 0, representing that current quiescent potential is higher than maximum power point voltage, needing working point to move toward reducing voltage direction.Otherwise, if U* (dI)+I* (dU) > 0, represent that work at present point voltage is lower than maximum power point voltage, needs to heighten quiescent potential.
When DC source output voltage is with environmental condition or the change of load reason, controller adjusts operating voltage point in time by above-mentioned workflow, so that controller reaches maximum power output, maximally utilizes the output energy of DC source.
Operating state 2
When the output voltage Vc of controller reaches the even charging voltage value Ve of setting, represent that load and storage battery no longer need the power of full-amount MPPT control mode output, voltage reduction module 2 transfers voltage stabilizing state to by MPPT state, now output voltage stabilization, and output current progressively reduces.
Operating state 3
Start timing when the output voltage Vc of controller reaches even charging voltage value Ve, after certain hour t1 (can establish), reduce output voltage to float charge voltage value Vf, namely transfer floating charge mode to by equal modes of filling.
When three kinds of operating states of above-mentioned 1,2,3, boost module 1 is closed, just voltage reduction module 2 works, be based on the input voltage Va of controller higher than the magnitude of voltage Vr (this value environmentally condition etc. can establish) of setting or the input voltage of controller and the difference of output voltage higher than (Va-Vc=△ U, this voltage difference carrys out Optimal Setting according to voltage reduction module self character and duty ratio) during some set points.
Operating state 4
When the input voltage Va of the controller that sampling control module in controller 7 samples lower than Vr but lower voltage limit V2 higher than tolerance interval time, with the input voltage of Time Controller and the difference of output voltage lower than (this voltage difference carrys out Optimal Setting according to voltage reduction module itself and duty ratio) during some set points, boost module 1 and the voltage reduction module 2 of this Time Controller all need work, the boost module 1 of prime is started working, automatic switch 4 disconnects, diode 3 blocks, prime boost module 1 is operated between MPPT ring and Voltage loop and alternately controls, the work of voltage reduction module 2 flow-limiting voltage-stabilizing.
Operating state 5
The condition of the MPPT state of prime boost module 1 is: when the duty ratio D of rear class voltage reduction module 2 is greater than a certain set point D1, duty ratio strengthens proves that rear class output current while regulation loop action, in increasing, needs prime to carry out the power output of MPPT state raising DC source.
Operating state 6
The condition that prime boost module 1 exits MPPT state is: when the duty ratio of the voltage reduction module 2 of rear class is less than a certain set point D2, while duty ratio reduces and proves the work of rear class regulation loop, output current is in reduction, power output is in reduction, need prime to exit MPPT state, reduce the power output of DC source 10.
When the MPPT ring of prime boost module 1 exits, DC source 10 power output reduces, now the duty ratio of the voltage reduction module 2 of rear class can increase △ D, for ensureing not to reenter MPPT state because of the increase of △ D, need △ D < D1-D2, namely represent that the duty ratio of the voltage reduction module 2 of rear class enters MPPT to prime and exit MPPT slightly different, have one to return stagnant, returning stagnant setting should hold controller steady operation, can improve again the utilance of DC source.
If when now the input voltage Va of controller is higher than Vr, then close boost module 1, diode 3 conducting, automatic switch 4 closes, and now only has the voltage reduction module 2 of rear class to work, gets back to operating state 1.
If when the input voltage Va of controller is lower than V2, then controller dormancy, communication equipment 9 load institute energy requirement is all provided by the electric discharge of 8 groups, storage battery.
Embodiment one: a kind of control device of solar photovoltaic powered system and control method
As shown in Figure 4, the control device schematic diagram that the present invention is based on solar photovoltaic powered system is given.In this embodiment, the DC source 10 shown in Fig. 2 is replaced with photovoltaic array 200, photovoltaic array 200 is powered to communication equipment load by controller as DC source, and storage battery is charged.
In order to compatible with the assembly output voltage of the solar electric power supply system throwing formula of removing in the past, also in order to compatible with 48V batteries, in the present embodiment one, adopt 2 pieces of standard P V assembly (English photovoltaicmodule of a group or many group parallel connections, photovoltaic module) solar battery of connecting is as DC source, and 1 piece of standard P V assembly is containing 72 Cell (electrochemical cell) series connection.
The power output of PV assembly strengthens with intensity of illumination and increases, and the output voltage of PV assembly reduces with the temperature rising of assembly.During 2 pieces of standard P V assembly series connection, MPPT maximum power point tracking MPPT (MaxiumPowerPointTrack) the voltage Vmp when assembly temperature 25 DEG C is about 72V.And during from-40 DEG C ~ 80 DEG C of range, during MPPT maximum power point tracking, voltage corresponds to Vmp is 98.4V ~ 49.6V.The charging voltage that communication 48V lead-acid batteries requires is: 43.2V ~ 57.6V.
As Fig. 4, the output of external one group or the many groups solar battery array be composed in series by 2 pieces of standard P V assemblies (200) of input point A of the boost module 1 of the present embodiment, is connected with the anode of diode 3, one end of automatic switch 4 simultaneously.The output point B of boost module 1 is connected with the input of voltage reduction module 2, is connected with the negative electrode of diode 3, the other end of automatic switch 4 simultaneously.The output point C of voltage reduction module 2 connects 48V lead-acid batteries or other close type batteries and communication equipment load with 48V voltage.Sampling control module 7 gathers voltage and current signal from A point, B point, C point respectively, after process computing, send boosting driver module 5, step-down driver module 6 and control automatic switch 4 and close or disconnect, boosting driver module 5 is used for driving boost module 1, step-down driver module 6 is used for driving voltage reduction module 2.
In control method when the controller of embodiment one works, comprise following several operating state:
Operating state 1:
When the controller of solar photovoltaic powered system starts, sampling control module 7 detects input voltage, when detecting that Va is more than or equal to Vr (this value environmentally condition etc. can be established), automatic switch 4 closes, boost module 1 does not work, the beginning MPPT of voltage reduction module 2 scans, tracking is operated in PV assembly peak power output point, when the output voltage of controller is lower than the even charging voltage value Ve (as 56.4V) set, represent that communication equipment 9 load and batteries 8 need the power output of controller to need enough large, then voltage reduction module 2 proceeds MPPT operating state.
When solar components changes with intensity of illumination, assembly temperature, load or other reason, controller adjusts operating voltage point in time by MPPT control mode, so that controller reaches maximum power output, maximally utilizes the output energy of photovoltaic module.
Operating state 2
When controller output voltage reaches the bulk charge pressure point of setting, represent that communication equipment 9 load and batteries 8 no longer need the power of full-amount MPPT control mode output, voltage reduction module 2 transfers the voltage stabilizing state of output voltage to by MPPT state, now output voltage stabilization, output current progressively reduces.
Operating state 3
Start timing when output voltage reaches even charging voltage value Ve, after certain hour t1, reduce output voltage to float charge voltage value Vf, all modes of filling that namely turns are floating charge mode.
Operating state 4
When three kinds of operating states of above-mentioned 1,2,3, boost module 1 is closed, just voltage reduction module 2 works, (establish 60 ~ 65V based on the input voltage of controller higher than the magnitude of voltage Vr set, this value environmentally condition etc. can be established) or the input voltage of controller and the difference of output voltage higher than (as 5V, this voltage difference carrys out Optimal Setting according to voltage reduction module itself and duty ratio) during some set points.If the input voltage of controller is lower than Vr, with the input voltage of Time Controller and the difference of output voltage lower than during some set points (as 5V, this voltage difference carrys out Optimal Setting according to voltage reduction module itself and duty ratio), boost module 1 and the voltage reduction module 2 of this Time Controller all need work, prime boost module 1 is started working, automatic switch 4 disconnects, diode 3 blocks, rear class voltage reduction module 2 voltage stabilizing work, prime boost module 1 adopts MPPT control mode and voltage regulation way alternately to control, and rear class is flow-limiting voltage-stabilizing control mode.
Operating state 5
The condition that prime boost module 1 enters MPPT state is: when the duty ratio of rear class voltage reduction module 2 is greater than a certain set point D1, duty ratio strengthens proves that rear class output current while regulation loop action, in increasing, needs prime to carry out the power output of MPPT state raising PV assembly.
Operating state 6
The condition that prime boost module 1 exits MPPT state is: when the duty ratio of rear class voltage reduction module 2 is less than a certain set point D2, while duty ratio reduces and proves the work of rear class regulation loop, output current is in reduction, power output is in reduction, need prime to exit MPPT state, reduce the power output of PV assembly.
When prime boost module 1 exit MPPT control mode time, PV assembly exports energy and reduces, now the duty ratio of rear class voltage reduction module 2 can increase △ D suddenly, for ensureing not to reenter MPPT state because of the increase of △ D, needs △ D < D1-D2.Namely represent that the duty ratio of rear class voltage reduction module 2 enters MPPT to prime and exit MPPT slightly different, have one to return stagnant, returning stagnant setting should hold controller steady operation, can improve again the utilance of DC source.
If when now the input voltage Va of controller is higher than Vr, then close boost module 1, diode 3 conducting, relay (i.e. automatic switch 4) closes, and now only has rear class voltage reduction module 2 to work, gets back to operating state 1.
If when the input voltage Va of controller is lower than V2, then controller dormancy, communication equipment 9 load institute energy requirement is all discharged by batteries 8 to be provided.
In embodiment one, described controller 100 and 2 pieces of standard packages connect to input as DC source, controller is step-down control mode or throwing is removed compared with formula, can improve the utilance of solar energy, concrete contrast situation can be joined and is shown in Table 1 technology contents.
Table 1: adopt the present embodiment and do not adopt the project plan comparison table of the present embodiment:
Note: in table 1, " 2 block assembly " refers to " 2 pieces of standard P V assembly series connection " abbreviation, abbreviation that " 3 block assembly " refers to " 3 pieces of standard P V assembly series connection ".
When communication equipment it is desirable that 24V electric power system time, then external PV assembly is that 1 piece or polylith standard package are in parallel, export equal float charge voltage value, prime boost module work starting resistor all relatively 48V system reduce by half.
When communication equipment it is desirable that 12V electric power system time, then external PV assembly is the modules in parallel of 1 piece or polylith 36 Cell series connection, exports equal float charge voltage value, prime boost module 1 starting resistor that works is 1/4 of 48V system.
When the lead acid accumulator of backup batteries not to be nominal voltage be 2V or 12V integral multiple, but during as other batteries such as lithium batteries, then in PV arrangement of components and controller, voltage is arranged according to aforementioned proportion equivalence.
Embodiment two: a kind of control device of wind power generation electric power system and control method
Embodiment two is as shown in Figure 5 substantially identical with the technical scheme of the embodiment one shown in Fig. 4, distinctive points is, compare photovoltaic array 200 as DC source, adopt blower fan power generation system 300 as power supply in embodiment two, blower fan generate electricity general output AC electricity, before the input of the controller 100 of powered by wind energy system, then increase a rectification module 11, the electric power sent by blower fan is transformed into direct current after carrying out rectification by rectification module.
The structure of follow-up control device 100 and control method, all similar to control method to the control device in embodiment 1.
Embodiment two, owing to adopting blower fan generating as DC source, by controller of the present invention, can improve the utilance of wind energy and the conversion efficiency of controller of fan itself.
The foregoing is only embodiments of the invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within right of the present invention.
Claims (9)
1. the control device of a new energy system, it is characterized in that, comprise: boost module (1), voltage reduction module (2), diode (3), automatic switch (4), boosting driver module (5), step-down driver module (6), sampling control module (7), wherein:
The output of input point (A) the external DC source of described boost module (1), is connected with the anode of diode (3), the first link of automatic switch (4) simultaneously;
The output point (B) of described boost module (1) is connected with the input of voltage reduction module (2), is connected with the negative electrode of diode (3), the second link of automatic switch (4) simultaneously;
The output point (C) of described voltage reduction module (2) is connected to batteries and communication equipment load;
Described sampling control module (7) is respectively from input point (A), the output point (B) of boost module (1), the output point (C) of voltage reduction module (2) gathers voltage and current signal, delivers to boosting driver module (5), step-down driver module (6) and control the closed of automatic switch (4) or disconnect after process computing;
Described boosting driver module (5) is used for driving boost module (1), and described step-down driver module (6) is used for driving voltage reduction module (2);
Automatic switch 4 is: relay or contactor;
Described boost module (1), for when the input voltage Va of input point (A) is lower than set point Vr, boosts to input voltage; For when input voltage Va is higher than set point Vr, closes and do not work;
When the input voltage Va of the boost module (1) that sampling control module (7) samples lower than setting threshold voltage Vr and lower voltage limit V2 higher than tolerance interval time, when the difference of the output voltage Vc of input voltage Va and boost module (2) is lower than setting voltage difference simultaneously, boost module (1) and voltage reduction module (2) all work, automatic switch (4) disconnects, diode (3) blocks, boost module (1) is operated in MPPT maximum power point tracking (MPPT) and alternately controls between control mode and voltage regulation way, voltage reduction module (2) flow-limiting voltage-stabilizing work,
The condition being operated in MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio D of voltage reduction module (2) is greater than setting dutyfactor value D1;
The condition exiting MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio of voltage reduction module (2) is less than setting dutyfactor value D2.
2. device as claimed in claim 1, is characterized in that,
Described automatic switch (4) at the input voltage Va of input point (A) higher than conducting during set point Vr, by boost module (1) short circuit.
3. device as claimed in claim 1, is characterized in that,
Described diode (3) does not have conducting instantaneously to voltage reduction module (2) power supply for the automatic switch (4) when boost module (1) is closed.
4. device as claimed in claim 2 or claim 3, is characterized in that,
Described voltage reduction module (2), for when the input voltage Va of input point (A) is higher than set point Vr, carries out step-down to the input voltage transmitted by automatic switch (4) or diode (3); Or for carrying out step-down lower than during set point Vr to the output voltage of boost module at the input voltage Va of input point (A).
5. device as claimed in claim 1, is characterized in that,
Described sampling control module (7), for from input point (A) sampled input voltage of boost module (1) and input current signal, the output current that the output point (B) of boost module (1) adopts voltage signal, the output point (C) of voltage reduction module (2) samples voltage reduction module (2) and output voltage signal, according to control boosting driver module (5) after the sample electric current and/or voltage signal computing that obtain and drive boost module (1), controlled hypotension driver module (6) drives voltage reduction module (2); Send the disconnected and logical of signal controlling automatic switch (4).
6. a control method for the control device of new energy system, is characterized in that,
Control device comprises: boost module (1), voltage reduction module (2), diode (3), automatic switch (4), boosting driver module (5), step-down driver module (6), sampling control module (7), wherein:
The output of input point (A) the external DC source of described boost module (1), is connected with the anode of diode (3), the first link of automatic switch (4) simultaneously;
The output point (B) of described boost module (1) is connected with the input of voltage reduction module (2), is connected with the negative electrode of diode (3), the second link of automatic switch (4) simultaneously;
The output point (C) of described voltage reduction module (2) is connected to batteries and communication equipment load;
Described sampling control module (7) is respectively from input point (A), the output point (B) of boost module (1), the output point (C) of voltage reduction module (2) gathers voltage and current signal, delivers to boosting driver module (5), step-down driver module (6) and control the closed of automatic switch (4) or disconnect after process computing;
Described boosting driver module (5) is used for driving boost module (1), and described step-down driver module (6) is used for driving voltage reduction module (2);
Described method comprises:
When sampling control module (7) detects that the input voltage Va of boost module (1) is more than or equal to setting threshold voltage Vr, automatic switch (4) closes, boost module (1) does not work, sampling control module (7) starts MPPT maximum power point tracking (MPPT) scanning by step-down driver module (6) controlled hypotension module (2), tracking is operated in DC source peak power output point, when the output voltage of controller is lower than the even charging voltage value Ve set, voltage reduction module (2) proceeds MPPT operating state;
Automatic switch (4) is: relay or contactor;
When the input voltage Va of input point (A) is lower than set point Vr, described boost module (1) boosts to input voltage; When input voltage Va is higher than set point Vr, described boost module (1) is closed and is not worked;
When the input voltage Va of the boost module (1) that sampling control module (7) samples lower than setting threshold voltage Vr and lower voltage limit V2 higher than tolerance interval time, when the difference of the output voltage Vc of input voltage Va and boost module (2) is lower than setting voltage difference simultaneously, boost module (1) and voltage reduction module (2) all work, automatic switch (4) disconnects, diode (3) blocks, boost module (1) is operated in MPPT maximum power point tracking (MPPT) and alternately controls between control mode and voltage regulation way, voltage reduction module (2) flow-limiting voltage-stabilizing work,
The condition being operated in MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio D of voltage reduction module (2) is greater than setting dutyfactor value D1;
The condition exiting MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio of voltage reduction module (2) is less than setting dutyfactor value D2.
7. method as claimed in claim 6, it is characterized in that, described method comprises further:
When the output voltage Vc of voltage reduction module (2) reaches the even charging voltage value Ve of setting, voltage reduction module (2) transfers voltage stabilizing state to by MPPT maximum power point tracking (MPPT).
8. method as claimed in claim 7, it is characterized in that, described method comprises further:
When the output voltage Vc of voltage reduction module (2) reaches even charging voltage value Ve, start timing, after certain hour t1, transfer floating charge mode to by equal modes of filling, now output voltage Vc is reduced to float charge voltage value Vf.
9. a control method for the control device of new energy system, is characterized in that,
Control device comprises: boost module (1), voltage reduction module (2), diode (3), automatic switch (4), boosting driver module (5), step-down driver module (6), sampling control module (7), wherein:
The output of input point (A) the external DC source of described boost module (1), is connected with the anode of diode (3), the first link of automatic switch (4) simultaneously;
The output point (B) of described boost module (1) is connected with the input of voltage reduction module (2), is connected with the negative electrode of diode (3), the second link of automatic switch (4) simultaneously;
The output point (C) of described voltage reduction module (2) is connected to batteries and communication equipment load;
Described sampling control module (7) is respectively from input point (A), the output point (B) of boost module (1), the output point (C) of voltage reduction module (2) gathers voltage and current signal, delivers to boosting driver module (5), step-down driver module (6) and control the closed of automatic switch (4) or disconnect after process computing;
Described boosting driver module (5) is used for driving boost module (1), and described step-down driver module (6) is used for driving voltage reduction module (2);
Method comprises:
When the input voltage Va of the boost module (1) that sampling control module (7) samples lower than setting threshold voltage Vr and lower voltage limit V2 higher than tolerance interval time, when the difference of the output voltage Vc of input voltage Va and voltage reduction module (2) is lower than setting voltage difference simultaneously, boost module (1) and voltage reduction module (2) all work, automatic switch (4) disconnects, diode (3) blocks, boost module (1) is operated in MPPT maximum power point tracking (MPPT) and alternately controls between control mode and voltage regulation way, voltage reduction module (2) flow-limiting voltage-stabilizing work,
The condition being operated in MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio D of voltage reduction module (2) is greater than setting dutyfactor value D1;
The condition exiting MPPT maximum power point tracking (MPPT) state of described boost module (1) is: the duty ratio of voltage reduction module (2) is less than setting dutyfactor value D2;
Automatic switch (4) is: relay or contactor;
When the input voltage Va of input point (A) is lower than set point Vr, described boost module (1) boosts to input voltage; When input voltage Va is higher than set point Vr, described boost module (1) is closed and is not worked.
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| CN105743373B (en) * | 2014-12-12 | 2018-07-27 | 易讯科技股份有限公司 | A kind of multiple protective DC voltage regulation device and method |
| TWI664798B (en) * | 2017-11-20 | 2019-07-01 | 國立成功大學 | Power supply system |
| CN108322020A (en) * | 2018-03-16 | 2018-07-24 | 广州金升阳科技有限公司 | A kind of liter of voltage protection circuit and its control method |
| JP7216889B2 (en) * | 2018-11-28 | 2023-02-02 | トヨタ自動車株式会社 | power system |
| JP7129008B2 (en) * | 2018-11-29 | 2022-09-01 | トヨタ自動車株式会社 | power system |
| CN109494989B (en) * | 2019-01-02 | 2020-06-09 | 西安微电子技术研究所 | Low-power voltage compensation combined DC/DC converter circuit and working method thereof |
| CN110196613B (en) * | 2019-05-28 | 2021-03-30 | 电子科技大学 | Power supply device for DUT in integrated circuit test system |
| CN110336353A (en) * | 2019-07-09 | 2019-10-15 | Oppo广东移动通信有限公司 | Battery, circuit system and its control method, electronic equipment |
| CN113965076A (en) * | 2021-10-28 | 2022-01-21 | 西安微电子技术研究所 | Low-voltage self-adaptive switching DC/DC multi-channel converter and control method |
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