CN100468274C - Power factor adjusting device - Google Patents
Power factor adjusting device Download PDFInfo
- Publication number
- CN100468274C CN100468274C CNB2006100009923A CN200610000992A CN100468274C CN 100468274 C CN100468274 C CN 100468274C CN B2006100009923 A CNB2006100009923 A CN B2006100009923A CN 200610000992 A CN200610000992 A CN 200610000992A CN 100468274 C CN100468274 C CN 100468274C
- Authority
- CN
- China
- Prior art keywords
- mentioned
- value
- reference value
- power
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/005—Valves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/10—Preventing damage by freezing or excess pressure or insufficient pressure
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
Providing a power factor adjuster that can adjust power factor to an optimum power factor, by using a small-capacity sub-capacitor for the control of the adjuster, according to a reactive power value Q, when the reactive power value Q becomes large, while the active power value P fed from a power company is small. According to the reactive power value Q when the active power value P is not smaller than a first reference value T1, and the small-capacity sub-capacitor is controlled so as to be opened and closed, according to the Q when the active power value P is smaller than a second reference value T2. When the relation T2<=P<T1 is satisfied, the sub-capacitor is controlled so as to be opened and closed, according the reactive power value Q when the reactive power value Q is smaller than a third reference value T3; whereas when T3<=Q is satisfied, the main capacitor is controlled so as to be opened and closed according to the reactive power value Q, whereby the power factor is improved.
Description
Technical field
The present invention relates to a kind of power-factor adjustment device, it is connected by power transformation with the load-side bus of transformer with being subjected to power transformation system etc., and the switching that improves a plurality of capacitors of usefulness by the power controlling factor improves power factor.
Background technology
In existing power-factor adjustment device, according to being used to judge the 1st and the 2nd reference value of active power load and the magnitude relationship between the useful power value, the power controlling factor improves the switching (for example, with reference to patent documentation 1) with capacitor.That is to say, under the less situation of useful power value (the useful power value is in the situation between the 1st reference value and the 2nd reference value), forbid the use of large value capacitor, utilize the closure of low value capacitor to carry out the adjustment of power factor.
Patent documentation 1: the spy opens flat 8-No. 336234 communiques (the 2nd page, Fig. 2)
Summary of the invention
As mentioned above, in existing power-factor adjustment device, be subjected to power transformation with large value capacitor and low value capacitor are installed on the load-side bus of transformer, under the little situation of useful power value (the useful power value is in the situation between the 1st reference value and the 2nd reference value), forbid the use of large value capacitor, utilize the closure of low value capacitor to carry out the adjustment of power factor.This is the control under also little this precondition of useful power value hour reactance capacity value.But, for example on the load-side bus that is subjected to power transformation with transformer, the non-utility power generation system is set, under the situation of the electric power that uses the electric power supplied with by the non-utility power generation system simultaneously and supplied with by Utilities Electric Co., the useful power value of supply capability that comes from Utilities Electric Co. sometimes is little and the reactance capacity value is big.If under such condition, use existing power-factor adjustment device, then exist power factor too to lag behind and the transmission losses increase, the problem of the effect that can't be improved.
The present invention puts forward in order to address the above problem just, and its purpose is to provide a kind of power-factor adjustment device, and it can both adjust to optimum power factor regardless of the size of useful power value and reactance capacity value.
The power-factor adjustment device that the present invention relates to has: the Power arithmetic unit, and it carries out computing according to magnitude of voltage in the electric system and current value to useful power value and reactance capacity value; The control signal generation unit, its above-mentioned useful power value more than or equal to the regulation the 1st reference value the time, perhaps above-mentioned useful power value is less than above-mentioned the 1st reference value and more than or equal to the 2nd reference value of stipulating, and above-mentioned reactance capacity value more than or equal to the regulation the 3rd reference value the time, export the 1st control signal, in above-mentioned useful power value less than above-mentioned the 1st reference value and more than or equal to above-mentioned the 2nd reference value, and above-mentioned reactance capacity value is exported the 2nd control signal during less than above-mentioned the 3rd reference value; The 1st control module, it is according to above-mentioned the 1st control signal and above-mentioned reactance capacity value, export the 1st and open and close signal, the 1st opens and closes signal by optionally controlling the 1st opening/closing unit, closed two or more the 1st capacitors that are connected with above-mentioned electric system through above-mentioned the 1st opening/closing unit, and, disconnect above-mentioned the 1st capacitor that does not have closure by optionally controlling above-mentioned the 1st opening/closing unit; And the 2nd control module, it is according to above-mentioned the 2nd control signal and above-mentioned reactance capacity value, export the 2nd and open and close signal, the 2nd opens and closes signal by optionally controlling the 2nd opening/closing unit, at least one is connected closure with above-mentioned electric system and 2nd capacitor littler than above-mentioned the 1st condenser capacity through above-mentioned the 2nd opening/closing unit, and, disconnect above-mentioned the 2nd capacitor that does not have closure by optionally controlling above-mentioned the 2nd opening/closing unit.
The effect of invention
By the present invention, because under the situation of useful power value more than or equal to the 1st reference value, perhaps the useful power value is less than the 1st reference value and more than or equal to the 2nd reference value, and under the situation of reactance capacity value more than or equal to the 3rd reference value, corresponding to reactance capacity value open and close controlling large value capacitor, on the other hand, in the useful power value less than the 1st reference value and more than or equal to the 2nd reference value, and under the situation of reactance capacity value less than the 3rd reference value, corresponding to reactance capacity value open and close controlling low value capacitor, so have following effect, promptly, even under the situation that reactance capacity is big in that useful power is little,, can both adjust to optimum power factor regardless of the size of useful power value and reactance capacity value.
Description of drawings
Fig. 1 is the structured flowchart that is subjected to the power transformation system that the power-factor adjustment device 1 in the embodiments of the present invention 1 is used in expression.
Fig. 2 is the structured flowchart of the Power arithmetic device 6 in the expression embodiments of the present invention 1.
Fig. 3 is the structured flowchart that the control part in the expression embodiments of the present invention 1 is selected circuit 7.
Fig. 4 is the structured flowchart that the control part in the expression embodiments of the present invention 2 is selected circuit 70.
Fig. 5 represents the structured flowchart of the control part selection circuit 700 in the embodiments of the present invention 3.
Fig. 6 is the structured flowchart that is subjected to the power transformation system that the power-factor adjustment device 1 in the embodiments of the present invention 4 has been used in expression.
Fig. 7 is the structured flowchart that the control part in the expression embodiments of the present invention 4 is selected circuit 17.
Embodiment
Accompanying drawing according to its embodiment of expression specifies the present invention below.In embodiment, be used for being subjected to the power transformation system with the power-factor adjustment device that will the present invention relates to, the situation of controlling the switching of a plurality of capacitors that the power-factor improvement that is connected with the load-side bus that is subjected to power transformation with transformer uses is that example describes.
Fig. 1 is the structured flowchart that is subjected to the power transformation system that the power-factor adjustment device 1 of embodiments of the present invention 1 is used in expression.In Fig. 1, on the load-side bus 3 of transformer 2, be provided with current transformer 4, the line current value of each phase of load-side bus 3 is measured.In addition, on load-side bus 3, connecting potential transformer 5, the magnitude of voltage of each phase of load-side bus 3 is being measured.The line current value of each phase of measuring and magnitude of voltage are transmitted to the Power arithmetic portion 6 as the Power arithmetic unit of power-factor adjustment device 1, and useful power value P and reactance capacity value Q are carried out computing.Useful power value P is transmitted to as the control part of control signal generation unit and selects circuit 7, reactance capacity value Q sent to respectively control part select circuit 7, as the master control part 8 of the 1st control module and as the sub-control portion 9 of the 2nd control module.Select in the circuit 7 at control part, the the 1st to the 3rd reference value according to useful power value P, reactance capacity value Q and regulation, to send master control part 8 and sub-control portion 9 respectively to as the 1st decision content 7a of the 1st control signal and as the 2nd decision content 7b of the 2nd control signal.
The following describes the action that is subjected to the power transformation system shown in Figure 1.Be arranged on current transformer 4 and potential transformer 5 on the load-side bus 3 of transformer 2, measure the voltage of line current and each phase of each phase respectively, send line current value 4a and magnitude of voltage 5a to Power arithmetic portion 6.Fig. 2 shows the structure of Power arithmetic portion 6.In Fig. 2, voltage phase shifter 61 makes the phase place of voltage postpone pi/2 in time.Reactance capacity unit 62 calculates reactance capacity, and useful power unit 63 calculates useful power.Multiplying is carried out in multiplier module 64 and 65 pairs of inputs.In addition, addition module 66 and 67 carries out additive operation to the output of multiplier module 64 and 65 respectively.
The following describes the action of Power arithmetic portion 6.After the magnitude of voltage 5a that sends each phase of Power arithmetic portion 6 to was transmitted to voltage phase shifter 61, phase place was delayed pi/2.The magnitude of voltage of each phase that phase place is delayed is transmitted to the multiplier module 64 of reactance capacity unit 62.The magnitude of voltage of each phase that 64 pairs of phase places of multiplier module are delayed carries out multiplying with each line current value 4a mutually.The result who is undertaken after the multiplying by multiplier module 64 is transmitted to addition module 66, carry out additive operation after, the actual value of the reactance capacity that the output three-phase adds up to, i.e. reactance capacity value Q.On the other hand, send the magnitude of voltage 5a of each phase of Power arithmetic portion 6 to, directly do not send the multiplier module 65 of useful power unit 63 to via voltage shift phase device 61.The magnitude of voltage 5a of 65 pairs of each phases of multiplier module carries out multiplying with each line current value 4a mutually.The result who is undertaken after the multiplying by multiplier module is transmitted to addition module 67, carry out additive operation after, the actual value of the useful power that the output three-phase adds up to, i.e. useful power value P.
From the useful power value P of Power arithmetic portion 6 output and reactance capacity value Q as shown in Figure 1, all be transmitted to control part and select circuit 7.The structure of control part selection circuit 7 as shown in Figure 3.In Fig. 3, the 1st reference value T1 that the little load of useful power will be detected in the 1st reference value configuration part 71 is set at the value of regulation, sends comparer 74 to.The 2nd reference value T2 that the little load of useful power will be detected in the 2nd reference value configuration part 72 is set at the value of regulation, sends comparer 75 to.The 3rd reference value T3 that the little load of reactance capacity will be detected in the 3rd reference value configuration part 73 is set at the value of regulation, sends comparer 76 to.After 74 to 76 pairs of inputs of comparer compare, output logic signal 1 or 0. Logical circuit 77 and 78 is according to input, and logical formula according to the rules is output as the 1st decision content 7a and the 2nd decision content 7b respectively with logical signal 1 or 0.
The following describes control part and select the action of circuit 7.The size of 74 couples the 1st reference value T1 of comparer and useful power value P compares judgement, at useful power value P output logic signal 1 during more than or equal to the 1st reference value T1, at useful power value P output logic signal 0 during less than the 1st reference value.The size of 75 couples the 2nd reference value T2 of comparer and useful power value P compares judgement, at useful power value P output logic signal 1 during more than or equal to the 2nd reference value T2, at useful power value P output logic signal 0 during less than the 2nd reference value T2.The size of 76 couples the 3rd reference value T3 of comparer and reactance capacity value Q compares judgement, at reactance capacity value Q output logic signal 1 during more than or equal to the 3rd reference value T3, at reactance capacity value Q output logic signal 0 during less than the 3rd reference value T3.Logical circuit 77, the output signal of comparer 74 be 0 and the output signal of comparer 75 be 1 and the output signal of comparer 76 be 1 o'clock, perhaps the output signal of comparer 74 is 1 o'clock, output logic signal 1 is as the 1st decision content 7a, when condition in addition, output logic signal 0 is as the 1st decision content 7a.Logical circuit 78, the output signal of comparer 74 be 0 and the output signal of comparer 75 be 1 and the output signal of comparer 76 be 0 o'clock, output logic signal 1 is as the 2nd decision content 7b, and under condition in addition, output logic signal 0 is as the 2nd decision content 7b.
In Fig. 1, at the 1st decision content 7a that selects circuit 7 to send here from control part is 1 o'clock, master control part 8 is according to the value of the reactance capacity value Q that sends here from Power arithmetic portion 6, and the power capacity of a known in advance N main capacitor 10, to 11 outputs of main switching portion to the n in N the main capacitor 10 that is connected with load-side bus 3 B signal that carries out closure, to meet or exceed the target power factor, that is, making power factor is 1 or leading power factor.On the other hand, for remaining (the individual main capacitor 10 of N-n), the b signal that their is disconnected to 11 outputs of main switching portion.In addition, it is 0 o'clock at the 1st decision content 7a, for all N main capacitor 10, to main switching portion 11 output b signals, to disconnect whole main capacitor 10.At the 2nd decision content 7b that selects circuit 7 to send here from control part is 1 o'clock, sub-control portion 9 is according to the value of the reactance capacity value Q that sends here from Power arithmetic portion 6, and the power capacity of known in advance M secondary capacitor 12, carry out closed a-signal to 13 outputs of pair switching portion to m in M the secondary capacitor 12 that is connected with load-side bus 3, to meet or exceed the target power factor, that is, make power factor more than or equal to 1.On the other hand, for remaining (the individual secondary capacitor 12 of M-m), a signal that their is disconnected to 13 outputs of pair switching portion.In addition, it is 0 o'clock at the 2nd decision content 7b, for all M secondary capacitor 12, to pair switching portion 13 output a signals, to disconnect whole secondary capacitors 12.
Main switching portion 11 is by the corresponding switch that is arranged on the main capacitor 10 of B signal closed and input, a closed desired n main capacitor 10, and, disconnect desired (the individual main capacitor 10 of N-n) by disconnecting the corresponding switch that is arranged on the main capacitor 10 of b signal with input.In addition, pair switching portion 13 is by the corresponding switch that is arranged on the secondary capacitor 12 of a-signal closed and input, closed desired m secondary capacitor 12, and, disconnect desired (M-m) individual secondary capacitor 12 by disconnecting and the corresponding switch of importing that is arranged on the secondary capacitor 12 of a signal.
In embodiment 1, measure in advance by using power meter etc., determine the T1～T3 that is set in the 1st to the 3rd above-mentioned reference value configuration part.For example, by measuring the useful power value Pd under non-utility power generation on daytime system 16 duties respectively, and the useful power value Pn under non-utility power generation at night system 16 halted states, set T1, specifically, be made as Pn＜T1＜Pd.In addition,, set T2, specifically, be made as Ph＜T2＜Pn by measuring the useful power value Ph of festivals or holidays.In addition, by measuring the reactance capacity value Qd under non-utility power generation on daytime system 16 duties respectively, and the reactance capacity value Qn under non-utility power generation at night system 16 halted states, set T3, specifically, be made as Qn＜T3＜Qd.
In the power-factor adjustment device 1 of above-mentioned such formation, on daytime at ordinary times, under the state that non-utility power generation system 16 stops, useful power value P, reactance capacity value Q are all big.That is to say that because useful power value P becomes T1 ≦ P, thereby comparer 74 is output as 1, so, logical circuit 77 be output as 1 and logical circuit 78 be output as 0.In the case, because in master control part 8,, come the big main capacitor of open and close controlling power capacity 10 by main switching portion 11, thereby can avoid becoming lagging power-factor corresponding to reactance capacity value Q.
In addition, make on daytime at ordinary times under the state of non-utility power generation system 16 work, if consider the useful power supplied with by non-utility power generation system 16, then useful power value P diminishes, on the other hand, and because of the characteristic reactance capacity value Q of generator becomes big.That is to say, because for useful power value P and reactance capacity value Q, T2 ≦ P＜T1 and T3 ≦ Q set up, thus comparer 74 be output as 0 and comparer 75 be output as 1 and comparer 76 be output as 1, therefore, logical circuit 77 be output as 1 and logical circuit 78 be output as 0.In the case, in master control part 8,, come the big main capacitor of open and close controlling power capacity 10 by main switching portion 11 corresponding to reactance capacity value Q.That is to say, do not use secondary capacitor 12 in the case and use main capacitor 10.Thus, owing to using main capacitor 10 capacious, thereby can avoid becoming lagging power-factor with respect to big reactance capacity value Q.
In addition, at ordinary times night useful power value P and reactance capacity value Q all little.That is to say, because for useful power value P and reactance capacity value Q, T2 ≦ P＜T1 and Q＜T3 set up, thus comparer 74 be output as 0 and comparer 75 be output as 1 and comparer 76 be output as 0, thereby logical circuit 77 be output as 0 and logical circuit 78 be output as 1.In the case, owing in sub-control portion 9,, come the little secondary capacitor 12 of open and close controlling power capacity by pair switching portion 13, thereby can avoid becoming lagging power-factor corresponding to reactance capacity value Q.And in the case, because the little secondary capacitor 12 of use capacity, so can avoid power factor significantly leading.
In addition, in power consumption minimum festivals or holidays, useful power value P and reactance capacity value Q are all little, thereby do not need to connect capacitor.In the case, because for useful power value P, P＜T2 sets up, thus comparer 74 be output as 0 and comparer 75 be output as 0 and comparer 76 be output as 0, therefore, logical circuit 77 be output as 0 and logical circuit 78 be output as 0.In the case, as mentioned above, master control part 8 and sub-control portion 9 to main switching portion 11 and secondary switching portion 13 output b signal and a signals, disconnects whole main capacitors 10 and secondary capacitor 12 simultaneously.That is to say, because not closed unwanted capacitor, thereby can avoid power factor significantly leading.
As described above described, by embodiment 1,, can both avoid becoming lagging power-factor regardless of the size of useful power value P and the size of reactance capacity value Q, power factor can be adjusted to optimum condition.
In addition, in the above description, illustrated that the power capacity with main capacitor 10 and secondary capacitor 12 is set at all identical situations, but it might not be identical.That is to say that the power capacity of main capacitor 10 and secondary capacitor 12 also can have nothing in common with each other.In addition, in the above description, the big situation of aggregate capacity of the secondary capacitor 12 of volume ratio of 1 main capacitor 10 has been described, but might not be bigger than it.
In addition, in the above explanation, illustrated that the target power factor is 1 situation, but target power factor not necessarily 1, so long as near 1 value, power factor is that lagging power-factor or leading power factor can.
In embodiment 1, the situation that reactance capacity value Q that the 3rd reference value T3 measures in advance according to using power meter etc. determines has been described.Relative with it, in embodiment 2, do not measure the reactance capacity value in advance, but set the 3rd reference value T3 according to the reactance capacity value Q in the moment of importing the specified reference value setting signal.Owing to used the structure that is subjected to the power transformation system of the power-factor adjustment device 1 in the embodiment 2, identical with Fig. 1 in the embodiment 1, thereby omit its explanation.In embodiment 2, the control part that uses control part to select circuit 70 to replace Fig. 1 is selected circuit 7.
Fig. 4 is the block diagram that the control part in the expression embodiment 2 is selected circuit 70, is equivalent to Fig. 3 of embodiment 1.In addition, identical with Fig. 3 part marks identical label and omits its explanation.In Fig. 4, as the 3rd reference value setting signal portion 701 output logic signals 1 or 0 of reference value setting signal output unit.Minimax reactance capacity storage control part 702 as minimax reactance capacity storage control unit, according to the useful power value P, the reactance capacity value Q that send here from Power arithmetic portion 6 and the 1st reference value T1, the 2nd reference value T2, determine the maximum reactance capacity Qmax and the minimum reactance capacity Qmin that should store.As the maximum reactance capacity Qmax of maximum reactance capacity storage part 703 storages of maximum reactance capacity storage unit, as the minimum reactance capacity Qmin of minimum reactance capacity storage part 704 storages of minimum reactance capacity storage unit.The 3rd reference value operational part 705 as the reference value arithmetic element carries out computing according to maximum reactance capacity Qmax and minimum reactance capacity Qmin, calculates the 3rd reference value T3.
The following describes the action that is subjected to the power transformation system in the embodiment 2.Because general action is identical with embodiment 1, thereby omits its explanation.In embodiment 2, the action of setting the 3rd reference value T3 is different with embodiment 1.Output logic signal 0 when the 3rd reference value setting signal portion 701 is usual, but when setting the 3rd reference value T3, output logic signal 1 is as the reference value setting signal.Under the situation of output logic signal 1, logical 772 in the logical circuit 771 and logical circuit 781 equal output logic signals 0.And this moment, during less than the 1st reference value T1 and more than or equal to the 2nd reference value T2, promptly under the situation that T2 ≦ P＜T1 sets up, set the 3rd reference value T3 at useful power value P.In the case, comparer 74 is output as logical signal 0.So, disconnect control by 9 pairs of all main capacitors 10 of master control part 8 and sub-control portion and secondary capacitor 12.Therefore, when setting the 3rd reference value T3, can get rid of the influence of all capacitors.
Minimax reactance capacity storage control part 702 is when setting the 3rd reference value T3, and promptly from the 3rd reference value setting signal portion 701 output logic signals 1, and useful power value P moves under the situation of T2 ≦ P＜T1.Then, if reactance capacity value Q is bigger than the maximum reactance capacity Qmax that has been stored in the maximum reactance capacity storage part 703, then with the value of this reactance capacity value Q as new maximum reactance capacity Qmax, store in the maximum reactance capacity storage part 703.On the other hand, if reactance capacity value Q is littler than the minimum reactance capacity Qmin that has been stored in the minimum reactance capacity storage part 704, then with the value of this reactance capacity value Q as minimum reactance capacity Qmin, store in the minimum reactance capacity storage part 704.The 3rd reference value operational part 705 calculates the maximum reactance capacity Qmax that is stored in the maximum reactance capacity storage part 703 and is stored in the intermediate value Qave=(Qmax+Qmin)/2 of the minimum reactance capacity Qmin in the minimum reactance capacity storage part 704, and sends Qave to the 3rd reference value configuration part 73 as the 3rd reference value T3.If the setting of the 3rd reference value T3 is finished, then stop the output of reference value setting signal, finish and set action.That is to say that the logical signal of exporting from the 3rd reference value setting signal portion 701 becomes 0 by 1.
By above action, can not measure reactance capacity value Q in advance and set the 3rd reference value T3.In addition, in above-mentioned action, even from the 3rd reference value setting signal portion 701 output logic signals 1, if useful power P is P＜T2 or T1 ≦ P, then minimax reactance capacity storage control part 702 also is failure to actuate.That is to say, under state that non-utility power generation on daytime system 16 at ordinary times stops or the festivals or holidays situations such, that irrespectively control with the value of the 3rd reference value T3, minimax reactance capacity storage control part 702 is failure to actuate, only just action under the value of the 3rd reference value T3 condition relevant with control.
In embodiment 2, illustrated by using the reference value setting signal, do not measure reactance capacity value Q in advance and set the situation of the 3rd reference value T3.In embodiment 3, the power capacity value according to employed main capacitor 10 and secondary capacitor 12 is described, set the situation of the 3rd reference value T3.Because used the structure that is subjected to the power transformation system of the power-factor adjustment device 1 in the embodiment 3, identical with Fig. 1 in the embodiment 1, thereby omit its explanation.In embodiment 3, the control part that uses control part to select circuit 700 to replace among Fig. 1 is selected circuit 7.
Fig. 5 is the block diagram that the control part in the expression embodiment 3 is selected circuit 700, is equivalent to Fig. 3 of embodiment 1 and Fig. 4 of embodiment 2.The part identical with Fig. 3 or Fig. 4 marks identical label and omits its explanation.In Fig. 5, the reactance capacity var value of storing in advance as the power capacity value of main capacitor 10 as the main capacitor var value configuration part 7001 of the 1st storage unit, the reactance capacity var value of storing in advance as the power capacity value of secondary capacitor 12 as the secondary capacitor var value configuration part 7002 of the 2nd storage unit.As the 3rd reference value operational part 705 of reference value arithmetic element according to from main capacitor var value configuration part 7001 and secondary capacitor var value configuration part 7002 main capacitor var value and the secondary capacitor var value sent here carry out computing, calculate the 3rd reference value T3.
The following describes the action that is subjected to transformation system in the embodiment 3.Because general action is identical with embodiment 1, thereby omits its explanation.In embodiment 3, main capacitor var value configuration part 7001 sends the power capacity Q1 of a main capacitor 10 to the 3rd reference value operational part 705.On the other hand, secondary capacitor var value configuration part 7002 sends whole secondary capacitors 12 power capacity sum Q2 to the 3rd reference value operational part 705.The 3rd reference value operational part 705 sends (Q1+Q2)/2 to the 3rd reference value configuration part 73 as the 3rd reference value T3 according to Q1 and Q2.
By above action, by embodiment 3, can with embodiment 2 in the same manner, do not measure reactance capacity value Q in advance and set the 3rd reference value T3.
Embodiment 4.
In embodiment 1, illustrate that by optionally main capacitor 10 or secondary capacitor 12 being carried out open and close controlling come the capacity of control capacitor, the situation of lagging power-factor is eliminated in control thus corresponding to reactance capacity value Q.Relative with it, in embodiment 4, allow to form lagging power-factor, be near the control of 1 value by making power factor, control and eliminate extreme leading power factor.In embodiment 4, use the 1st master control part 81 and the 2nd master control part 82 to replace master control part 8 among Fig. 1.
Fig. 6 is the structured flowchart that is subjected to the power transformation system in the expression embodiment 4, is equivalent to Fig. 1 of embodiment 1.In addition, the part identical with Fig. 1 marks identical label and omits its explanation.In Fig. 6, the control part of power-factor adjustment device 1 selects circuit 17 output the 3rd decision content 7c and the 4th decision content 7d to replace the 1st decision content 7a.The 3rd decision content 7c wherein is transmitted to the 1st master control part 81.In addition, the 4th decision content 7d is transmitted to the 2nd master control part 82.
The following describes the action that is subjected to the power transformation system in the embodiment 4.Because the action before 6 output useful power value P of Power arithmetic portion and reactance capacity value Q is identical with embodiment 1, thereby omits its explanation.In embodiment 4, control part selects circuit 17 output the 3rd decision content 7c and the 4th decision content 7d to replace the 1st decision content 7a.Fig. 7 is the block diagram that the control part in the expression embodiment 4 is selected circuit 17, is equivalent to Fig. 3 of embodiment 1, Fig. 4 of embodiment 2 or Fig. 5 of embodiment 3.In addition, the part identical with Fig. 3 to Fig. 5 marks identical label and omits its explanation.In Fig. 7, the size of 74 couples the 1st reference value T1 of comparer and useful power value P compares judgement, at useful power value P during more than or equal to the 1st reference value T1, output logic signal 1 is as the 3rd decision content 7c, in addition, during less than the 1st reference value T1, output logic signal 0 is as the 3rd decision content 7c at useful power value P.Logical circuit 79 the output signal of comparer 74 be 0 and the output signal of comparer 75 be 1 and the output signal of comparer 76 be 1 o'clock, output logic signal 1 is as the 4th decision content 7d, under condition in addition, output logic signal 0 is as the 4th decision content 7d.
The 1st master control part 81 is according to the 3rd decision content 7c that selects circuit 17 to send here from control part, according to the value of the reactance capacity value Q that sends here from Power arithmetic portion 6 and the power capacity of main capacitor 10, to the B signal of the closed main capacitor 10 of main switching portion 11 outputs and with the b signal of its disconnection.That is to say that non-utility power generation on the daytime system 16 at ordinary times is that halted state is this, under the situation that T1 ≦ P sets up, the 1st master control part 81 is carried out and the identical action of master control part 8 in the embodiment 1, to avoid becoming lagging power-factor.
On the other hand, the 2nd master control part 82 is according to the 4th decision content 7d that selects circuit 17 to send here from control part, according to the value of the reactance capacity value Q that sends here from Power arithmetic portion 6 and the power capacity of main capacitor 10, to the B signal of the closed main capacitor 10 of main switching portion 11 outputs and with the b signal of its disconnection, so that power factor becomes the value near 1.
Specifically, make the state of non-utility power generation system 16 work this on daytime at ordinary times, T2 ≦ P＜T1 and T3 ≦ Q sets up, and allows to become under the situation of lagging power-factor, and the 2nd master control part 82 replaces the 1st control part 81 and moves.Promptly the 2nd master control part 82 is utilized optionally open and close controlling main capacitor 10 of main switching portion 11, allows lagging power-factor and makes power factor near 1 control, to avoid occurring extreme leading power factor.In addition, in these cases, sub-control portion 9 also with the 2nd master control part 82 in the same manner, make power factor near 1 control.In addition, because later action is identical with embodiment 1, thereby omit its explanation.
As mentioned above,,, can both adjust power factor, and can control and extreme leading power factor do not occur regardless of the size of useful power value P or the size of reactance capacity value Q by embodiment 4.
Claims (7)
1. power-factor adjustment device is characterized in that having:
The Power arithmetic unit, it carries out computing according to magnitude of voltage in the electric system and current value to useful power value and reactance capacity value;
The control signal generation unit, its above-mentioned useful power value more than or equal to the regulation the 1st reference value the time, perhaps above-mentioned useful power value is less than above-mentioned the 1st reference value and more than or equal to the 2nd reference value of stipulating, and above-mentioned reactance capacity value more than or equal to the regulation the 3rd reference value the time, export the 1st control signal, in above-mentioned useful power value less than above-mentioned the 1st reference value and more than or equal to above-mentioned the 2nd reference value, and above-mentioned reactance capacity value is exported the 2nd control signal during less than above-mentioned the 3rd reference value;
The 1st control module, it is according to above-mentioned the 1st control signal and above-mentioned reactance capacity value, export the 1st and open and close signal, the 1st opens and closes signal is used for two or more the 1st capacitors of being connected with above-mentioned electric system at through the 1st opening/closing unit, by optionally controlling above-mentioned the 1st opening/closing unit, need closed above-mentioned the 1st capacitor closure and make, and by optionally controlling above-mentioned the 1st opening/closing unit, and will not need closed above-mentioned the 1st capacitor to disconnect; And
The 2nd control module, it is according to above-mentioned the 2nd control signal and above-mentioned reactance capacity value, export the 2nd and open and close signal, the 2nd opens and closes signal is used at being connected with above-mentioned electric system through the 2nd opening/closing unit and at least one 2nd capacitor littler than above-mentioned the 1st condenser capacity, by optionally controlling above-mentioned the 2nd opening/closing unit, need closed above-mentioned the 2nd capacitor closure and make, and by optionally controlling above-mentioned the 2nd opening/closing unit, and will not need closed above-mentioned the 2nd capacitor to disconnect.
2. power-factor adjustment device according to claim 1 is characterized in that,
Above-mentioned the 3rd reference value is that above-mentioned useful power value is less than above-mentioned the 1st reference value and more than or equal to the maximal value under the situation of above-mentioned the 2nd reference value, above-mentioned reactance capacity value and the intermediate value of minimum value.
3. power-factor adjustment device according to claim 1 is characterized in that having:
Reference value setting signal output unit, its output reference value setting signal, this reference value setting signal disconnect above-mentioned the 1st opening/closing unit and above-mentioned the 2nd opening/closing unit, and the setting of above-mentioned the 3rd reference value is carried out in indication simultaneously;
Minimax reactance capacity storage control unit, it judges the maximal value and the minimum value of reactance capacity value according to said reference value setting signal;
Maximum reactance capacity storage unit, it stores the maximal value of above-mentioned reactance capacity value;
Minimum reactance capacity storage unit, it stores the minimum value of above-mentioned reactance capacity value; And
The reference value arithmetic element, it carries out computing to maximal value that is stored in the reactance capacity value in the above-mentioned maximum reactance capacity storage unit and the intermediate value that is stored in the minimum value of the reactance capacity value in the above-mentioned minimum reactance capacity storage unit, and is set at above-mentioned the 3rd reference value.
4. power-factor adjustment device according to claim 1 is characterized in that having:
The 1st storage unit, it stores above-mentioned the 1st capacitor volume;
The 2nd storage unit, it stores above-mentioned the 2nd capacitor volume; And
The reference value arithmetic element, it is to being stored in the minimum capacity in above-mentioned the 1st capacitor in above-mentioned the 1st storage unit, carry out computing with the intermediate value of the aggregate capacity that is stored in above-mentioned the 2nd capacitor in above-mentioned the 2nd storage unit, and be set at above-mentioned the 3rd reference value.
5. according to any described power-factor adjustment device in the claim 1 to 4, it is characterized in that,
Above-mentioned the 1st control module output makes power factor open and close signal more than or equal to the 1st of setting.
6. according to any described power-factor adjustment device in the claim 1 to 4, it is characterized in that,
Above-mentioned the 1st control module output makes power factor open and close signal near the 1st of setting.
7. power-factor adjustment device is characterized in that having:
The Power arithmetic unit, it carries out computing according to magnitude of voltage in the electric system and current value to useful power value and reactance capacity value;
The control signal generation unit, its above-mentioned useful power value more than or equal to the regulation the 1st reference value the time, export the 1st control signal, above-mentioned useful power value less than above-mentioned the 1st reference value and more than or equal to the regulation the 2nd reference value, and above-mentioned reactance capacity value more than or equal to the regulation the 3rd reference value the time, export the 2nd control signal, in above-mentioned useful power value less than above-mentioned the 1st reference value and more than or equal to above-mentioned the 2nd reference value, and above-mentioned reactance capacity value is exported the 3rd control signal during less than above-mentioned the 3rd reference value;
The 1st control module, it is according to above-mentioned the 1st control signal and above-mentioned reactance capacity value, export the 1st and open and close signal, the 1st opens and closes signal is used for two or more the 1st capacitors of being connected with above-mentioned electric system at through the 1st opening/closing unit, by optionally controlling above-mentioned the 1st opening/closing unit, need closed above-mentioned the 1st capacitor closure and make, and by optionally controlling above-mentioned the 1st opening/closing unit, and will not need closed above-mentioned the 1st capacitor to disconnect, thereby make power factor more than or equal to setting;
The 2nd control module, it is according to above-mentioned the 2nd control signal and above-mentioned reactance capacity value, export the 2nd and open and close signal, the 2nd opens and closes signal is used at above-mentioned the 1st capacitor, by optionally controlling above-mentioned the 1st opening/closing unit, need closed above-mentioned the 1st capacitor closure and make, and by optionally controlling above-mentioned the 1st opening/closing unit, and will not need closed above-mentioned the 1st capacitor to disconnect, thereby make power factor near setting; And
The 3rd control module, it is according to above-mentioned the 3rd control signal and above-mentioned reactance capacity value, export the 3rd and open and close signal, the 3rd opens and closes signal is used at being connected with above-mentioned electric system through the 2nd opening/closing unit and at least one 2nd capacitor littler than above-mentioned the 1st condenser capacity, by optionally controlling above-mentioned the 2nd opening/closing unit, need closed above-mentioned the 2nd capacitor closure and make, and by optionally controlling above-mentioned the 2nd opening/closing unit, and will not need closed above-mentioned the 2nd capacitor to disconnect.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005201658 | 2005-07-11 | ||
| JP2005201658A JP2007020365A (en) | 2005-07-11 | 2005-07-11 | Power factor adjuster |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1896899A CN1896899A (en) | 2007-01-17 |
| CN100468274C true CN100468274C (en) | 2009-03-11 |
Family
ID=37609435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100009923A Expired - Fee Related CN100468274C (en) | 2005-07-11 | 2006-01-13 | Power factor adjusting device |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP2007020365A (en) |
| KR (1) | KR100738761B1 (en) |
| CN (1) | CN100468274C (en) |
| TW (1) | TWI275921B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2010201620B8 (en) | 2010-02-18 | 2012-05-03 | Mitsubishi Heavy Industries, Ltd. | Maintenance operation method for wind turbine generator and wind turbine generator |
| CN102280893A (en) * | 2011-08-09 | 2011-12-14 | 东营区供电公司 | Electric power line optimizing and compensating device |
| JP6536348B2 (en) * | 2015-10-22 | 2019-07-03 | 三菱電機株式会社 | Power factor adjustment device and power factor adjustment method |
| TWI693768B (en) * | 2019-02-18 | 2020-05-11 | 英捷力電機股份有限公司 | Method for monitoring capacitance value of capacitor in power system |
| KR102272981B1 (en) * | 2019-09-05 | 2021-07-05 | 목포대학교산학협력단 | Device for controlling voltage of renewable energy power system based on power factor |
| KR102173655B1 (en) * | 2020-03-04 | 2020-11-03 | 주식회사 쓰리아이씨 | A method for determinating the disturbance direction in power plant |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204150A (en) * | 1978-06-20 | 1980-05-20 | H.O.P. Consulab Inc. | Apparatus and method for regulating the power factor in an electrical distributing-network line |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04372527A (en) * | 1991-06-20 | 1992-12-25 | Nkk Corp | Automatic controller of phase-advance capacitor |
| JPH05341863A (en) * | 1992-06-08 | 1993-12-24 | Mitsubishi Electric Corp | Automatic power factor controller |
| JPH08336234A (en) * | 1995-06-05 | 1996-12-17 | Nissin Electric Co Ltd | Power receiving facility |
| JP2000032664A (en) | 1998-07-14 | 2000-01-28 | Chubu Electric Power Co Inc | Method and device for controlling reactive power- adjusting device with capacitor bank |
| KR100554263B1 (en) * | 2002-12-12 | 2006-02-22 | 홍윤기 | Electric energy saving system using power-factor correction |
-
2005
- 2005-07-11 JP JP2005201658A patent/JP2007020365A/en active Pending
- 2005-11-22 TW TW094140904A patent/TWI275921B/en not_active IP Right Cessation
-
2006
- 2006-01-11 KR KR1020060003233A patent/KR100738761B1/en not_active IP Right Cessation
- 2006-01-13 CN CNB2006100009923A patent/CN100468274C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4204150A (en) * | 1978-06-20 | 1980-05-20 | H.O.P. Consulab Inc. | Apparatus and method for regulating the power factor in an electrical distributing-network line |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2007020365A (en) | 2007-01-25 |
| TW200702971A (en) | 2007-01-16 |
| KR20070007700A (en) | 2007-01-16 |
| TWI275921B (en) | 2007-03-11 |
| KR100738761B1 (en) | 2007-07-12 |
| CN1896899A (en) | 2007-01-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100468274C (en) | Power factor adjusting device | |
| CN102394501B (en) | Energy-saving method and device based on power grid load dynamic balance | |
| Li et al. | Power quality enhancement and engineering application with high permeability distributed photovoltaic access to low-voltage distribution networks in Australia | |
| Rao et al. | A generalized approach for determination of optimal location and performance analysis of FACTs devices | |
| US20180219377A1 (en) | Apparatuses including power electronics circuitry, and related methods of operation | |
| CN106033891B (en) | A kind of automatic commutation device of low-voltage load parallel on-line and its operating method | |
| Efkarpidis et al. | Technical assessment of centralized and localized voltage control strategies in low voltage networks | |
| CN104104325B (en) | The control method of a kind of group of string data photovoltaic DC-to-AC converter and system | |
| WO2004042889A1 (en) | Hybrid power flow controller and method | |
| JP3591247B2 (en) | Loosely coupled power system controller | |
| CN102055198B (en) | Reactive compensation intelligent monitoring management system | |
| CN109713726A (en) | The adaptive model forecast Control Algorithm run for Z-source inverter isolated island and grid connected dual mode | |
| US20220253080A1 (en) | Smart voltage reduction and reverse power operating mode determination for load tap charging transformers and voltage regulators | |
| AU2012374312B2 (en) | Power consumption mode guiding device and system | |
| CN109390941B (en) | Power distribution system for distributed energy supply system | |
| Bogodorova et al. | Voltage control-based ancillary service using thermostatically controlled loads | |
| Singh et al. | UPFC facts devices in power system to improve the voltage profile and enhancement of power transfer loadability | |
| JP5274413B2 (en) | Phase advance capacitor controller | |
| CN111541257B (en) | Residential micro-grid based on high-frequency alternating-current bus and operation method | |
| Rehtanz | Dynamic power flow controllers for transmission corridors | |
| CN205429746U (en) | Intelligent terminal voltage dynamic adjustment ware | |
| Soni et al. | Potentials and capabilities of FACTS controllers for quality and performance enhancement of power system | |
| CN111404252A (en) | Power supply energy storage device | |
| CN110429610A (en) | A kind of idle regulation method containing more DFACTS equipment power distribution system voltages | |
| Mewara et al. | Conceptual comparative study of New FACTS Technology: Unified Power Flow Controller Distributed Power Flow Controller Interline Power Flow Controller and Separated-Interline Power Flow Controller |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090311 Termination date: 20110113 |