CN103078332A - Transformer inductive reactive power stepped control device and method - Google Patents
Transformer inductive reactive power stepped control device and method Download PDFInfo
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Abstract
The invention discloses a transformer inductive reactive power stepped control device and method. The transformer inductive reactive power stepped control device and method have the advantages that the rapid automatic stepped switching of multiple groups of capacitors are realized, the accuracy is high, the response speed is fast, the power consumption is low, the cost is low, the reliability is high and the requirements on the rapidness and the real-time performance of the reactive compensation of low-voltage transformers are satisfied.
Description
Technical field
The invention belongs to low-voltage dynamic reactive power compensation technique field, particularly a kind of transformer lagging reactive power has a grade control technology.
Background technology
In recent years, because the increase of net capacity requires also to increase with day to electric network reactive-load.Reactive power source is to guarantee electric power quality, quality of voltage, reduction via net loss and the indispensable part of safe operation as meritorious power supply.Transformer is as the important pivot part in the electric power transfer, and the reactive balance problem is particularly important.When the reactive balance imbalance of transformer bus side, when power factor reduced, line loss increased, and power equipment can not get rational Application, and user's terminal voltage descends.When serious, can cause device damage, system splitting.Therefore, resolve the reactive power compensation problem of transformer in the power distribution network, the electrical network wastage reducing and energy saving is had very important meaning.
At present, the control of reactive power compensating technology mainly contains three kinds: the one, with A.C. contactor as the fixing switching executive component of power capacitor, but impulse current is large when dropping into owing to it, produce overvoltage during excision, self lift one's head rapid wear even melting welding, noise is large, and equipment failure rate is high, poor reliability is also than being easier to occur overcompensation and undercompensation problem.The 2nd, adopt thyristor to replace A.C. contactor as the switching executive component, it guarantees to drop into the capacitor group near the voltage zero district, thereby avoided the generation of inrush phenomenon, finish when current over-zero and cut off, avoided the appearance of temporary overvoltage, this has just met the requirement of the operating passing zero of capacitor from function, in addition because the not restriction of silicon controlled triggering times, can realize accurate dynamic compensation (response time is at Millisecond), therefore be applicable to the frequent switching of capacitor, be highly suitable for the load condition of frequent variations, with respect to A.C. contactor qualitative leap arranged; Yet solid-state relay has fatal weakness in application: the controlled silicon conducting voltage drop is about about 1V when the energising operation exactly, loss is very large, so owing to there being large power consumption to need heat radiation to avoid the thermal breakdown of PN junction, just to need the very large radiator of usable floor area in order lowering the temperature, even to need fan to carry out forced ventilation.The 3rd, the static reacance generator that had just risen in recent years, its main body is a voltage source inverter, by the suitable break-make of turn-off thyristor, direct voltage on the electric capacity is converted into the three-phase alternating voltage synchronous with power system voltage, again by reactor and transformers connected in parallel access electrical network, the output voltage of suitable control inverter, just can change neatly its operating condition, make it be in capacitive, perception or zero load state, the static reacance generator response speed is faster in theory, harmonic current still less and still can inject larger reactive power to system when system voltage is low; But because its control technology more complicated, reliability and very large defective is arranged economically is to such an extent as to seldom use this type of compensation technique on the market.
Summary of the invention
Given this, the object of the present invention is to provide a kind of transformer lagging reactive power that a grade control technology is arranged, the problem that exists to overcome above-mentioned prior art, thus effectively realize continuous adjusting and the dynamic equilibrium of transformer lagging reactive power.
According to an aspect of the present invention, provide a kind of transformer lagging reactive power that a grade control device is arranged, described device comprises: voltage/current isolation sensor, voltage transformer, DC converter, controller, circuit breaker, combination switch, power capacitor bank, digital pipe display circuit and status indicator lamp, wherein
Described voltage/current isolation sensor comprises each self-corresponding voltage/current isolation sensor of triple line, and it is used for the alternating voltage on the phase line and alternating current are carried out isolation processing, thus convert to can with described controller in the phase voltage signal of CPU compatibility;
Described voltage transformer is used for three-phase voltage is depressured to low-voltage ac voltage, with the input end signal as the locking phase Acquisition Circuit in the described controller;
Described DC converter is used for being input to after in real time each capacitor residual voltage value step-down with described power capacitor bank the analog to digital conversion circuit in the described controller;
Described controller is used for realizing signal processing and the control of described device, and it comprises that further D/A converting circuit, locking phase Acquisition Circuit, CPU and optocoupler trigger and drive circuit;
Described circuit breaker is used for when transformer various faults or described device occur breaks down described device being protected;
Described combination switch is respectively separately corresponding switch of triple line, and each switch all further comprises thyristor and A.C. contactor in parallel;
Described power capacitor bank is separately corresponding power capacitor bank of triple line;
Described digital pipe display circuit is used for circulation and shows the triple line parameters of electric power; And
Described status indicator lamp is used to indicate unit state, and the buzzer warning function is provided.
Preferably, described CPU is the ARM7 chip.
Preferably, described low-voltage ac voltage is 6V.
Preferably, every mutually described power capacitor bank comprises N electric capacity, is the control capacittance that the electric capacity of C, two capacitances are respectively C/2, C/4 comprising N-2 capacitance.
Preferably, described parameters of electric power comprises: voltage, electric current and power factor.
Preferably, described unit state comprises: switching state, overvoltage and the low-pressure state of every branch road.
Preferably, in described controller,
Described CPU, the signal of inputting for the treatment of described D/A converting circuit and described locking phase Acquisition Circuit, and trigger and drive circuit is realized control to described combination switch by described optocoupler;
Described D/A converting circuit, capacitor residual voltage value for the phase voltage signal that described voltage/current isolation sensor is changed and the output of described DC converter converts the digital signal that described CPU can directly process to, the output of the described described voltage/current isolation sensor of D/A converting circuit one termination and described DC converter, the other end directly link to each other with described CPU;
Described locking phase Acquisition Circuit is embodied as voltage comparator, be used for the voltage signal of electrical network is converted into the square-wave signal of same frequency, with the real-time tracking mains frequency, wherein, the low-voltage ac voltage of processing by described voltage transformer is two input end signals of described voltage comparator, described locking phase Acquisition Circuit is detecting the sinusoidal phase voltage of transformer bus side by bearing to positive zero passage moment, the external interrupt of the described CPU of instantaneous triggering, the output of the described voltage transformer of described locking phase Acquisition Circuit one termination, the external interrupt mouth of the described CPU of another termination; And
Described optocoupler triggers and drive circuit is embodied as optical coupler and NPN type triode at a high speed, this optical coupler is isolated output with the electric impulse signal that described CPU sends through opto-electronic conversion, increase driving force through this triode again, described this optocoupler triggers and the described CPU of drive circuit one termination, and the other end is connected with the trigger end of each thyristor in the described combination switch respectively.
According to another aspect of the present invention, also provide a kind of transformer lagging reactive power that stage control method is arranged, described control method has a grade control device operation by above-mentioned transformer lagging reactive power, said method comprising the steps of:
Step 1: the AC voltage/current of measuring every phase line, make measurement result pass through analog to digital conversion circuit in voltage/current isolation sensor and the controller, thereby convert the digital phase voltage signal that the CPU in the controller can directly process to, and send into CPU and process;
Step 2: DC converter gathers each the capacitor residual voltage value in the power capacitor bank, through the analog-to-digital conversion of the analog to digital conversion circuit in the controller, sends into CPU and processes after the step-down, thereby calculate phase-triggered angle and corresponding timer count value;
Step 3: voltage transformer is depressured to low-voltage ac voltage with three-phase voltage, be input to the locking phase Acquisition Circuit in the controller, the locking phase Acquisition Circuit changes into this low-voltage ac voltage the square-wave signal of same frequency, and in the sinusoidal phase voltage of transformer bus side by negative to positive zero passage instantaneous trigger CPU external interrupt, timer among the CPU begins counting at this moment, and CPU gathers the load current of transformer bus side simultaneously;
Step 4:CPU calculates power system reactive power according to phase voltage signal and load current; And
Step 5: when the timer counting reaches above-mentioned timer count value, CPU triggers and drive circuit transmission trigger impulse to the optocoupler of controller, optocoupler triggers and the drive circuit basis is controlled the trigger end of each thyristor in each combination switch with the switching scheme that the reactive power that calculates is complementary, thereby makes corresponding power capacitor bank carry out the switching operation.
Preferably, in described step 2, timer internal among the CPU is configured to per 0.1 microsecond timer counting and adds 1, namely a complete electrical network cycle needs timer counting 200000 times, the trigger angle 0-360 ° of correspondence that is about to one-period becomes counting 0-200000 time, timer is counted every increase by 1 and is equivalent to trigger angle and moves (360/200000) °
Therefore each voltage gather capacitor residual voltage value corresponding to a corresponding phase place in the AC signal, calculates corresponding phase-triggered angle α and corresponding timer count value N according to this capacitor residual voltage value, and computing formula is
Preferably, in described step 4, the concrete mode of calculating power system reactive power is:
If phase voltage is:
The load phase current is:
Namely
Wherein, U is the electrical network rated voltage, i
p(t) and i
q(t) be respectively active current and reactive current component,
When ω t=2k π,
Reactive power is: P=UI
QM
According to technique scheme, the present invention has realized that precision is high to the fast automatic classification switching of multiple unit capacitor, and fast response time is low in energy consumption, and cost is low, and reliability is high, has satisfied low-tension transformer reactive power compensation rapidity and requirement of real-time.
Owing to adopting down trigger and timer to cooperate the thyristor precision Control Technology that realizes, so that conducting transient voltage zero cross fired is injected without harmonic wave substantially.During current over-zero, the generation of transient state overvoltage phenomenon has been avoided in the excision of thyristor automatic current zero passage.Apparatus of the present invention adopt combination switch as switching element, its operation principle is that thyristor is in parallel with A.C. contactor, so that have advantages of the thyristor operating passing zero in the moment that switches on and off, during normal the connection, has advantages of again the contactless contactor idle.Because A.C. contactor resistance is little, thereby do not generate heat, so just need not outer radiation fin and fan, reduced cost, thoroughly avoided the phenomenon of burning of thyristor, really reached the purpose of saving energy and reduce the cost.
Description of drawings
Fig. 1 is the structure chart that the transformer lagging reactive power has grade control device in the specific embodiment of the invention;
Fig. 2 is the schematic diagram in kind that the transformer lagging reactive power has grade control device in the specific embodiment of the invention;
Fig. 3 is the flow chart of steps that the transformer lagging reactive power has stage control method in the specific embodiment of the invention.
Embodiment
Fig. 1 is the structure chart that the transformer lagging reactive power has grade control device in the specific embodiment of the invention.As shown in Figure 1, the transformer lagging reactive power in the specific embodiment of the invention has a grade control device to comprise: voltage/current isolation sensor 1, voltage transformer 2, DC converter 3, controller 4, circuit breaker 5, combination switch 6-8, power capacitor bank 9-11, digital pipe display circuit 12 and status indicator lamp 13 etc.
Below just introduce in detail above-mentioned each construction module in conjunction with Fig. 1:
Voltage/current isolation sensor 1 comprises each self-corresponding voltage/current isolation sensor of triple line, the effect of this transducer is that the alternating voltage on the phase line and alternating current are carried out isolation processing, thus convert to can with controller 4 in the phase voltage signal of CPU compatibility.
Voltage transformer 2 is used for three-phase voltage is depressured to low-voltage ac voltage, probably about 6V, with the input end signal as the locking phase Acquisition Circuit in the controller 4.
DC converter 3 is used for being input to after in real time each capacitor residual voltage value (because capacitor is energy-storage travelling wave tube, it can maintain certain residual voltage after the each cut) step-down with power capacitor bank 9-11 in the analog to digital conversion circuit in the controller 4.
Controller 4, namely the transformer lagging reactive power has the main circuit board of grade control device, processes and control with the signal of realizing this device.This controller 4 further comprises D/A converting circuit, locking phase Acquisition Circuit, CPU and optocoupler triggering and drive circuit etc.
Wherein, CPU can be embodied as the ARM7 chip, the signal of inputting for the treatment of D/A converting circuit and locking phase Acquisition Circuit, and trigger and drive circuit is realized control to combination switch 6-8 by optocoupler.
Wherein, D/A converting circuit is used for the digital signal that the analog signal conversion such as capacitor residual voltage value of phase voltage signal that voltage/current isolation sensor 1 is changed and DC converter 3 outputs become CPU directly to process.The output of this D/A converting circuit one termination voltage/separate current sensor 1 and DC converter 3, the other end directly links to each other with CPU.
Wherein, the locking phase Acquisition Circuit can be embodied as voltage comparator, is used for the voltage signal of electrical network is converted into the square-wave signal of same frequency, with the real-time tracking mains frequency.Particularly, because the low-voltage ac signal of input locking phase Acquisition Circuit has two signal line, article one, be live wire, article one, be zero line, alternating voltage about the 6V that processed by voltage transformer 2 on this two signal line is exactly two input end signals of comparator, wherein, zero line is as reference voltage (exchanging 0V), and live wire is as needs voltage relatively.When exchanging positive half period, hot voltage is greater than zero line voltage, voltage comparator output high level, and when when exchanging negative half-cycle, hot voltage is less than zero line voltage, the voltage comparator output low level.The square-wave signal of final comparator output and AC signal same frequency, that is, AC signal changes into the square-wave signal of same frequency by comparator.The locking phase Acquisition Circuit is detecting the sinusoidal phase voltage of transformer bus side by bearing to positive zero passage moment instantaneous triggering CPU external interrupt, the at this moment current effective value of CPU Quick Acquisition transformer bus side.The output of this locking phase Acquisition Circuit one termination voltage instrument transformer 2, the external interrupt mouth of another termination CPU.
Wherein, optocoupler triggers and drive circuit is embodied as optical coupler and NPN type triode at a high speed, and this optical coupler is isolated output with the electric impulse signal that CPU sends through opto-electronic conversion, increases driving force through triode again.This optocoupler triggers and drive circuit one termination CPU, and the other end is connected with the trigger end of each thyristor among the combination switch 6-8 respectively.
Combination switch 6-8 is respectively separately corresponding switch of triple line, all further comprise thyristor and A.C. contactor in parallel, its basic functional principle is: thyristor is subject to the control of this optocoupler triggering and drive circuit, be responsible for input and the excision of control capacitor, A.C. contactor is responsible for keeping the connection after capacitor drops into and is excised front cut-out.Thyristor is just out of service immediately after A.C. contactor drops into, and has so just avoided the heating of thyristor, and when excision, A.C. contactor disconnects first, and thyristor can disconnect by nature when current over-zero.Because the combination switch that thyristor and A.C. contactor consist of belongs to prior art, the specific implementation that thyristor and A.C. contactor function are switched in this combination switch repeats no more herein.
Like this, because this thyristor is in parallel with this A.C. contactor, so that have advantages of the thyristor operating passing zero in the moment that switches on and off, during normal the connection, has advantages of again A.C. contactor switch idle, thoroughly avoid the phenomenon of burning of thyristor, and reached energy-saving and cost-reducing purpose.
Power capacitor bank 9-11 is separately corresponding power capacitor bank of triple line.The reactive power of transformer consumption generally is about 10%～15% of its rated capacity, according to formula Q=2 π fCU
2In N electric capacity of every phase power capacitor bank, this part reactive power is converted into the electric capacity that N-2 capacitance be C, the combining form that two capacitances are respectively the control capacittance of C/2, C/4, and the adjusting of compensation just has the 4N level like this, has effectively improved compensation precision.
Digital pipe display circuit 12 is used for the parameters of electric power such as voltage, electric current and power factor that circulation shows triple line.
Status indicator lamp 13 is device running LEDs, is used to indicate switching state and overvoltage and the low pressure caution of every branch road, and the buzzer warning function is provided.
Fig. 2 is the schematic diagram in kind that the transformer lagging reactive power has grade control device in the specific embodiment of the invention.As shown in Figure 2, shown in the Reference numeral 101,102,103 is respectively the interface of transformer and controller, the 110th, the voltage/current isolation sensor, the 109th, controller, the 104th, circuit breaker, the 105th, combination switch, the 106th, power capacitor bank, the 108th, hold the cabinet of apparatus of the present invention, and 107 is DC converter.
Fig. 3 is the flow chart of steps that the transformer lagging reactive power has stage control method in the specific embodiment of the invention.As shown in Figure 3, this control method may further comprise the steps:
Step 1: the AC voltage/current of measuring every phase line, make measurement result pass through analog to digital conversion circuit in voltage/current isolation sensor and the controller, thereby convert the digital phase voltage signal that the CPU in the controller can directly process to, and send into CPU and process.
Step 2: DC converter gathers each the capacitor residual voltage value in the power capacitor bank, through the analog-to-digital conversion of the analog to digital conversion circuit in the controller, sends into CPU and processes after the step-down, thereby calculate phase-triggered angle and corresponding timer count value.
Step 3: voltage transformer is depressured to low-voltage ac voltage with three-phase voltage, be input to the locking phase Acquisition Circuit in the controller, the locking phase Acquisition Circuit changes into this low-voltage ac voltage the square-wave signal of same frequency, and in the sinusoidal phase voltage of transformer bus side by negative to positive zero passage instantaneous trigger CPU external interrupt, timer among the CPU begins counting at this moment, and CPU gathers the load current of transformer bus side simultaneously.
Particularly, the cycle of the square-wave signal of locking phase Acquisition Circuit output is 20 milliseconds of electrical network cycles (frequency is 50 hertz), timer internal among the CPU of the present invention is configured to per 0.1 microsecond timer counting and adds 1, namely a complete electrical network cycle needs timer counting 200000 times, trigger angle (0-360 °) correspondence that can be understood as one-period becomes counting 0-200000 time, also can be understood as timer and counts every increase by 1 and be equivalent to trigger angle and move (360/200000) °.Like this, each voltage as long as detect voltage, just calculates corresponding phase angle corresponding to a corresponding phase place in the AC signal, and further calculates the coupling count value N of timer.Specific implementation process is: when needing switching, gather first capacitor residual voltage value, calculate the coupling count value N(of corresponding triggering control phase angle [alpha] and corresponding timer according to formula according to this capacitor residual voltage value
), and at 0 ° triggering CPU external interrupt, simultaneously the opening timing device of electrical network in the cycle.
Step 4:CPU calculates reactive power according to phase voltage signal and load current.
Particularly, measuring in real time reactive power is the prerequisite that realizes dynamic compensation, and it is to calculate according to the load current, the phase voltage signal that collect, and concrete principle is prior art, and existing brief introduction is as follows:
If the contact phase voltage is
The load phase current is
Namely
Wherein, U is the electrical network rated voltage, i
p(t) and i
q(t) be respectively active current and reactive current component.
Work as ω
tDuring=2k π,
As seen, as long as measure at phase voltage positive going zeror crossing load current constantly, just know corresponding reactive current maximum I
QM, reactive power is: P=UI
QMThis reactive current detection method is simple, quick, and each needs only once sampling in one-period, can satisfy the requirement of the dynamic phase splitting compensation of first-harmonic.
Step 5: when the timer counting reaches above-mentioned timer count value, CPU triggers and drive circuit transmission trigger impulse to the optocoupler of controller, optocoupler triggers and the drive circuit basis is controlled the trigger end of each thyristor in each combination switch with the switching scheme that the reactive power that calculates is complementary, thereby makes corresponding power capacitor bank carry out the switching operation.
Concrete switching the establishment of the project principle is: according to the reactive power of calculating, select only one group of electric capacity to carry out switching, so that the reactive power that electric capacity is arranged in pairs or groups is close to the reactive power of calculating.Because configuration electric capacity is to realize that the definite value reactive power is state of the art, those skilled in the art can make rational capacitor switching configuration according to the reactive power that calculates at an easy rate in capacitor group 9-11, do not do herein and give unnecessary details.
According to above-mentioned embodiment introduction as can be known, the present invention has realized that precision is high to the fast automatic classification switching of multiple unit capacitor, and fast response time is low in energy consumption, and cost is low, and reliability is high, has satisfied low-tension transformer reactive power compensation rapidity and requirement of real-time.Owing to adopting down trigger and timer to cooperate the thyristor precision Control Technology that realizes, so that conducting transient voltage zero cross fired is injected without harmonic wave substantially.During current over-zero, the generation of transient state overvoltage phenomenon has been avoided in the excision of thyristor automatic current zero passage.Apparatus of the present invention adopt combination switch as switching element, its operation principle is that thyristor is in parallel with A.C. contactor, so that have advantages of the thyristor operating passing zero in the moment that switches on and off, during normal the connection, has advantages of again the contactless contactor idle.Because A.C. contactor resistance is little, thereby do not generate heat, so just need not outer radiation fin and fan, reduced cost, thoroughly avoided the phenomenon of burning of thyristor, really reached the purpose of saving energy and reduce the cost.
Claims (10)
1. a transformer lagging reactive power has a grade control device, it is characterized in that, described device comprises: voltage/current isolation sensor, voltage transformer, DC converter, controller, circuit breaker, combination switch, power capacitor bank, digital pipe display circuit and status indicator lamp, wherein
Described voltage/current isolation sensor comprises each self-corresponding voltage/current isolation sensor of triple line, and it is used for the alternating voltage on the phase line and alternating current are carried out isolation processing, thus convert to can with described controller in the phase voltage signal of CPU compatibility;
Described voltage transformer is used for three-phase voltage is depressured to low-voltage ac voltage, with the input end signal as the locking phase Acquisition Circuit in the described controller;
Described DC converter is used for being input to after in real time each capacitor residual voltage value step-down with described power capacitor bank the analog to digital conversion circuit in the described controller;
Described controller is used for realizing signal processing and the control of described device, and it comprises that further D/A converting circuit, locking phase Acquisition Circuit, CPU and optocoupler trigger and drive circuit;
Described circuit breaker is used for when transformer various faults or described device occur breaks down described device being protected;
Described combination switch is respectively separately corresponding switch of triple line, and each switch all further comprises thyristor and A.C. contactor in parallel;
Described power capacitor bank is separately corresponding power capacitor bank of triple line;
Described digital pipe display circuit is used for circulation and shows the triple line parameters of electric power; And
Described status indicator lamp is used to indicate unit state, and the buzzer warning function is provided.
2. device according to claim 1 is characterized in that, described CPU is the ARM7 chip.
3. device according to claim 1 is characterized in that, described low-voltage ac voltage is 6V.
4. device according to claim 1 is characterized in that, every mutually described power capacitor bank comprises N electric capacity, is the control capacittance that the electric capacity of C, two capacitances are respectively C/2, C/4 comprising N-2 capacitance.
5. device according to claim 1 is characterized in that, described parameters of electric power comprises: voltage, electric current and power factor.
6. device according to claim 1 is characterized in that, described unit state comprises: switching state, overvoltage and the low-pressure state of every branch road.
7. the described device of each claim is characterized in that according to claim 1-6, in described controller,
Described CPU, the signal of inputting for the treatment of described D/A converting circuit and described locking phase Acquisition Circuit, and trigger and drive circuit is realized control to described combination switch by described optocoupler;
Described D/A converting circuit, capacitor residual voltage value for the phase voltage signal that described voltage/current isolation sensor is changed and the output of described DC converter converts the digital signal that described CPU can directly process to, the output of the described described voltage/current isolation sensor of D/A converting circuit one termination and described DC converter, the other end directly link to each other with described CPU;
Described locking phase Acquisition Circuit is embodied as voltage comparator, be used for the voltage signal of electrical network is converted into the square-wave signal of same frequency, with the real-time tracking mains frequency, wherein, the low-voltage ac voltage of processing by described voltage transformer is two input end signals of described voltage comparator, described locking phase Acquisition Circuit is detecting the sinusoidal phase voltage of transformer bus side by bearing to positive zero passage moment, the external interrupt of the described CPU of instantaneous triggering, the output of the described voltage transformer of described locking phase Acquisition Circuit one termination, the external interrupt mouth of the described CPU of another termination; And
Described optocoupler triggers and drive circuit is embodied as optical coupler and NPN type triode at a high speed, this optical coupler is isolated output with the electric impulse signal that described CPU sends through opto-electronic conversion, increase driving force through this triode again, described this optocoupler triggers and the described CPU of drive circuit one termination, and the other end is connected with the trigger end of each thyristor in the described combination switch respectively.
8. a transformer lagging reactive power has stage control method, it is characterized in that, described control method has a grade control device operation by each described transformer lagging reactive power among the claim 1-7, said method comprising the steps of:
Step 1: the AC voltage/current of measuring every phase line, make measurement result pass through analog to digital conversion circuit in voltage/current isolation sensor and the controller, thereby convert the digital phase voltage signal that the CPU in the controller can directly process to, and send into CPU and process;
Step 2: DC converter gathers each the capacitor residual voltage value in the power capacitor bank, through the analog-to-digital conversion of the analog to digital conversion circuit in the controller, sends into CPU and processes after the step-down, thereby calculate phase-triggered angle and corresponding timer count value;
Step 3: voltage transformer is depressured to low-voltage ac voltage with three-phase voltage, be input to the locking phase Acquisition Circuit in the controller, the locking phase Acquisition Circuit changes into this low-voltage ac voltage the square-wave signal of same frequency, and in the sinusoidal phase voltage of transformer bus side by negative to positive zero passage instantaneous trigger CPU external interrupt, timer among the CPU begins counting at this moment, and CPU gathers the load current of transformer bus side simultaneously;
Step 4:CPU calculates power system reactive power according to phase voltage signal and load current; And
Step 5: when the timer counting reaches above-mentioned timer count value, CPU triggers and drive circuit transmission trigger impulse to the optocoupler of controller, optocoupler triggers and the drive circuit basis is controlled the trigger end of each thyristor in each combination switch with the switching scheme that the reactive power that calculates is complementary, thereby makes corresponding power capacitor bank carry out the switching operation.
9. method according to claim 8, it is characterized in that, in described step 2, timer internal among the CPU is configured to per 0.1 microsecond timer counting and adds 1, namely a complete electrical network cycle needs timer counting 200000 times, the trigger angle 0-360 ° of correspondence that is about to one-period becomes counting 0-200000 time, and timer is counted every increase by 1 and is equivalent to trigger angle and moves (360/200000) °
Therefore each voltage gather capacitor residual voltage value corresponding to a corresponding phase place in the AC signal, calculates corresponding phase-triggered angle α and corresponding timer count value N according to this capacitor residual voltage value, and computing formula is
10. method according to claim 8 is characterized in that, in described step 4, the concrete mode of calculating power system reactive power is:
If phase voltage is:
The load phase current is:
Namely
Wherein, U is the electrical network rated voltage, i
p(t) and i
q(t) be respectively active current and reactive current component,
When ω t=2k π,
Reactive power is: P=UI
QM
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| CN104218580A (en) * | 2014-09-23 | 2014-12-17 | 张慧慧 | Distributed smart power grid adjustment device |
| CN104242224A (en) * | 2014-08-25 | 2014-12-24 | 国家电网公司 | Design method for input inductive load control parameters of compound switch |
| CN104882894A (en) * | 2015-06-18 | 2015-09-02 | 南京新联能源技术有限责任公司 | Reactive compensation controller based on dynamic phase-splitting compensation and control method thereof |
| CN104967042A (en) * | 2015-07-07 | 2015-10-07 | 国家电网公司 | Outdoor switch cabinet circuit breaker action alarm device |
| CN105717842A (en) * | 2016-03-21 | 2016-06-29 | 珠海博威智能电网有限公司 | Zero crossing detection medium voltage on-off controller and control method |
| CN110618308A (en) * | 2019-10-18 | 2019-12-27 | Tcl空调器(中山)有限公司 | Single-phase alternating-current voltage zero point detection method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000259268A (en) * | 1999-03-10 | 2000-09-22 | Matsushita Electric Ind Co Ltd | Device for compensating static reactive power |
| CN201199628Y (en) * | 2008-02-03 | 2009-02-25 | 沈阳工大恒晟鑫源机械制造有限公司 | Protecting equipment for electric force power distribution PLC control detection line |
| CN201623488U (en) * | 2009-11-02 | 2010-11-03 | 哈尔滨九洲电气股份有限公司 | Trigger pulse forming device used in high-voltage reactive power compensation equipment |
| CN201994680U (en) * | 2011-04-01 | 2011-09-28 | 河南新月实业有限公司 | Nondestructive intelligent switching device for high-voltage capacitor group |
-
2013
- 2013-01-05 CN CN201310003156.0A patent/CN103078332B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000259268A (en) * | 1999-03-10 | 2000-09-22 | Matsushita Electric Ind Co Ltd | Device for compensating static reactive power |
| CN201199628Y (en) * | 2008-02-03 | 2009-02-25 | 沈阳工大恒晟鑫源机械制造有限公司 | Protecting equipment for electric force power distribution PLC control detection line |
| CN201623488U (en) * | 2009-11-02 | 2010-11-03 | 哈尔滨九洲电气股份有限公司 | Trigger pulse forming device used in high-voltage reactive power compensation equipment |
| CN201994680U (en) * | 2011-04-01 | 2011-09-28 | 河南新月实业有限公司 | Nondestructive intelligent switching device for high-voltage capacitor group |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104242224A (en) * | 2014-08-25 | 2014-12-24 | 国家电网公司 | Design method for input inductive load control parameters of compound switch |
| CN104218580A (en) * | 2014-09-23 | 2014-12-17 | 张慧慧 | Distributed smart power grid adjustment device |
| CN104882894A (en) * | 2015-06-18 | 2015-09-02 | 南京新联能源技术有限责任公司 | Reactive compensation controller based on dynamic phase-splitting compensation and control method thereof |
| CN104967042A (en) * | 2015-07-07 | 2015-10-07 | 国家电网公司 | Outdoor switch cabinet circuit breaker action alarm device |
| CN105717842A (en) * | 2016-03-21 | 2016-06-29 | 珠海博威智能电网有限公司 | Zero crossing detection medium voltage on-off controller and control method |
| CN110618308A (en) * | 2019-10-18 | 2019-12-27 | Tcl空调器(中山)有限公司 | Single-phase alternating-current voltage zero point detection method and device |
| CN110618308B (en) * | 2019-10-18 | 2021-11-09 | Tcl空调器(中山)有限公司 | Single-phase alternating-current voltage zero point detection method and device |
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| CN103078332B (en) | 2014-12-03 |
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