CN1101070C - Electric network reactive-load continuous compensation method and its compensation equipment - Google Patents
Electric network reactive-load continuous compensation method and its compensation equipment Download PDFInfo
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- CN1101070C CN1101070C CN 00125031 CN00125031A CN1101070C CN 1101070 C CN1101070 C CN 1101070C CN 00125031 CN00125031 CN 00125031 CN 00125031 A CN00125031 A CN 00125031A CN 1101070 C CN1101070 C CN 1101070C
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- Y02E40/30—Reactive power compensation
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Abstract
The present invention relates to an electric network reaction continuous compensation method and a compensation device. A fixed capacitor is connected in series with a variable voltage source, and then, coupled in an electric network for replacing a cutting throw mode of a traditional capacitor. The variable voltage source is generated by an automatic coupling voltage regulator or an inverter and can be coupled in the electric network directly or by a transformer. The capacitor is used under the condition of zero current, and the damage of an impact current to the electric network and the capacitor can be avoided. The sampling monitoring can be realized by a power factor display circuit, a capacitance current and a voltage detecting circuit. The reaction automatic continuous compensation of the electric network can be realized by adjusting the numerical value of the variable voltage source and continuously changing the size of a compensating current.
Description
Technical field:
The present invention relates to a kind of technology and compensation arrangement of electric network reactive-load Continuous Compensation, can be used for the single-phase or three phase reactive power compensation of high-low pressure electrical network, belong to technical field of power systems.
Background technology:
The main capacitor that adopts of power system reactive power compensation is at present both at home and abroad cut the throwing method, is about to capacitor and is directly parallel in the electrical network phase line---phase line or phase line---between the center line, by changing electrical network shunt capacitance value, reaches the purpose that changes offset current.Existing reactive power compensation technology and optimal compensating method as introducing among the Cui Chizai " low-voltage distribution network reactive power compensation simple analysis " (electric power network technique, in July, 2000) also all adopt the capacitor switching method.The reactive power compensation technology that these are traditional, throwing owing to cutting of electric capacity is that classification is carried out, so the offset current that produces also is a phase step type, power system reactive power is compensated completely, make electrical network still often be in undercompensation or overcompensation state, power factor can not be near 1, so the ability of power supply unit can not be fully utilized, the line loss of supply line can not drop to minimum value.In addition, the mechanical type A.C. contactor is adopted in the throwing of cutting of electric capacity at present mostly, arcing adhesion easily between its contact, and working life is short, and response speed is slow, and is cutting the throwing process also to system's generation surge voltage and impulse current.Though some electric capacity are cut the throwing device and used contactless solid-state relay instead, its cost height will produce bigger excess loss when flowing through than the large compensation electric current.
Summary of the invention:
The objective of the invention is to avoid the problems referred to above of existing power system reactive power compensation technique and device existence, a kind of power system reactive power continuous compensating method is proposed, and according to the reactive power compensator of the method design, make it effectively to realize automatic Continuous Compensation, reduce line loss, and can avoid the infringement of power network overvoltage and harmonic wave building-out capacitor.
For realizing such purpose, adopted following measure in the technical scheme of the present invention, insert the phase line---phase line or phase line---of electrical network between the center line after promptly single fixed capacity capacitor C being connected with a variable voltage source UV, by changing the size of voltage source UV, continuously change the size of offset current, to realize the The optimal compensation of reactive power.Concrete grammar comprises the steps: 1) maximum offset current (ic) max that produces according to every branch road needs chooses a single fixed capacitor (C), be C=(ic) max/U ω, wherein U is the grid line voltage of access leg or the effective value of phase voltage, and ω is the angular frequency of electric network source; 2) with fixed capacitor (C) and variable voltage source (U
V) be in series and afterwards insert between the phase line-phase line or phase line-center line of electrical network; 3) produce size from 0-U, phase place, variable voltage source (U that frequency is identical with power supply with autotransformer or inverter
V), required variable voltage source (U
V) numerical value require the actual ic value that produces offset current according to every branch road, by formula ic=(ic) max (1-U
V/ U) obtain; 4) by zero current commutation circuit (ZC) monitoring variable voltage source (U
V) value, when confirming U
VDuring=U, A.C. contactor (LJ) is closed a floodgate, make building-out capacitor insert electrical network, to realize the zero current input together with variable voltage source; 5) by current transformer and voltage transformer detect user's electric current and voltage mutually, make coupled power factor and display circuit (PFC) show power factor value, when power factor is crossed when low, its output drives the forward and backward of motor (M) by control circuit or controller or changes the triggering signal of inverter, to change variable voltage source U
VNumerical value, thus offset current ic value changed, to reach best compensation effect.
Concerning low voltage electric network, can be directly electrical network be inserted in the output of the sliding contact of the automatic coupling voltage regulator B back of connecting with fixed capacitor C.To the three-phase reactive power compensation, but then each inserts fixed capacitor C and automatic coupling voltage regulator B mutually respectively.When three-phase compensates respectively, the sliding contact output of automatic coupling voltage regulator B with after fixed capacitor C connects, is connected on phase line---between the center line; During three-phase synchroballistic, the sliding contact output of automatic coupling voltage regulator B with after fixed capacitor C connects, is connected on phase line---between the phase line.
Concerning high-voltage fence, as low-tension supply is arranged near the compensation arrangement, then with autotransformer B and low-tension supply and connect, the output voltage of its sliding contact is connected with capacitor C by the step-up transformer back of boosting, and inserts electrical network again.As near compensation arrangement, there not being low-tension supply, then low pressure autotransformer B is inserted high-voltage fence again by the step-down reactor, the output voltage of its sliding contact is connected with capacitor C after boosting by a step-up transformer, inserts electrical network again.
When needs carry out quick dynamic compensation to power system reactive power, the variable voltage source U that the present invention proposes
VTo be produced by transformer, controller, DC power supply and inverter, inverter changes DC power supply into its first-harmonic and electrical network same frequency, synchronous sine voltage, subsequently by the transformer access electrical network afterwards of connecting with capacitor C.Controller sampling main circuit voltage and current information constantly change to keep inverter output voltage and synchronized and to make it amplitude, to reach the The optimal compensation purpose.
The existing electric capacity of the present invention is cut throwing formula reactive power compensation device and is compared and have following outstanding advantage:
1, can realize the automatic continuously of power system reactive power compensated, make power factor of electric network near 1, thereby reach the power supply capacity of bringing into play power supply unit to greatest extent and the purpose that reduces line loss.
2, can realize building-out capacitor zero current condition input, avoided existing apparatus to cut when throwing impact fully to electrical network at electric capacity, also avoided dropping into the infringement of impulse current that moment may occur, the working life that can prolong capacitor significantly to electric capacity self at electric capacity.
3, replace the multistage throwing electric capacity of cutting with single large bulk capacitance, can further reduce cost and volume with reduction means.
4, capacitor classification time-delay 10s-120s is cut throwing and be the variation of real-time tracking power system reactive power, dynamic response time shortens dramatically.
5, avoid the infringement of power network overvoltage and harmonic wave, and remain on the function of the normal compensation of this condition lower device building-out capacitor.
Description of drawings and embodiment:
For understanding technical scheme of the present invention better, technical scheme of the present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is a power system reactive power continuous compensating method schematic diagram of the present invention.
As shown in the figure, power system reactive power Continuous Compensation circuit is by power supply U, fixed capacitor C and variable voltage source U
VForm.
Fig. 2 is the single-phase reactive power Continuous Compensation of low voltage electric network embodiment figure.
Among the figure, variable voltage source U
VAdopt automatic coupling voltage regulator B, power system reactive power Continuous Compensation circuit is made up of power supply U, fixed capacitor C and automatic coupling voltage regulator B, inserts electrical network after the sliding contact output of automatic coupling voltage regulator B is connected with fixed capacitor C.
Fig. 3 compensates embodiment figure respectively for the low voltage electric network three phase reactive power.
Among the figure, each is connected to fixed capacitor C and automatic coupling voltage regulator B mutually respectively in the electrical network.The electrical network phase line is inserted in the sliding contact output of the automatic coupling voltage regulator B back of connecting with fixed capacitor C---between the center line, i.e. and three Y connections that coordinate.
Fig. 4 is low voltage electric network three phase reactive power synchroballistic embodiment figure.
Among the figure, each is connected to fixed capacitor C and automatic coupling voltage regulator B mutually respectively in the electrical network.The electrical network phase line is inserted in the sliding contact output of the automatic coupling voltage regulator B back of connecting with fixed capacitor C---between the phase line, i.e. and three star-star-delta connection Y-Y-s that coordinate.
As Fig. 2, Fig. 3, shown in Figure 4, to low voltage electric network compensation, the variable voltage source U that the present invention adopts
VBe to produce, change its sliding contact position, just can change the variable voltage source U that connects with capacitor C by single-phase or three-phase automatic coupling voltage regulator B
VNumerical value, when contact position during in the top, U
V=U, offset current ic are zero, when contact position during bottom, and U
V=0, offset current ic is a maximum.
Fig. 5 is for there being low-tension supply high-voltage fence reactive power Continuous Compensation embodiment figure.
As shown in the figure, automatic coupling voltage regulator B and low-tension supply U/n also connect, the secondary side winding of the output voltage of its sliding contact by the step-up transformer T1 back back access electrical network of connect with capacitor C that boosts.
Fig. 6 is no low-tension supply high-voltage fence reactive power Continuous Compensation embodiment figure.
As shown in the figure, near compensation arrangement as no low-tension supply, low pressure automatic coupling voltage regulator B inserts high-voltage fence again by a step-down reactor L, the secondary side winding of the output voltage of its sliding contact by the step-up transformer T1 back back access electrical network of connect with capacitor C that boosts.
Fig. 7 is the power system reactive power Continuous Compensation embodiment figure with fast dynamic response characteristic.
Among the figure, when needs carry out quick dynamic compensation to power system reactive power, the variable voltage source U that the present invention proposes
VBy transformer T2, controller CR, DC power supply U
DAnd inverter IT produces DC power supply U
DIT is connected with inverter, and the output of inverter IT is connected to transformer T2, inserts electrical network after the output of transformer T2 is connected with capacitor C.
Inverter IT is with DC power supply U
DChange its first-harmonic and electrical network same frequency, synchronous sine voltage into, insert electrical network after connecting with capacitor C by the pair side of transformer T2 subsequently.Being controlled by controller CR with size synchronously of alternating voltage, controller CR sampling main circuit voltage and current information constantly change to keep inverter output voltage and synchronized and to make it amplitude, to reach the The optimal compensation purpose.
Fig. 8 is that power system reactive power Continuous Compensation device is implemented block diagram.
Compensate situation respectively for three-phase shown in the circuit, remove compensation fixed capacitor C, variable voltage source U
VAdopt outside the automatic coupling voltage regulator B, also comprise circuit breaker ZD, zero current input affirmation circuit ZC, A.C. contactor CJ, power factor detection and display circuit PFC, motor positive inversion control circuit MC, motor M and capacitance current and voltage detecting circuit CVD etc.The sliding contact of automatic coupling voltage regulator B inserts electrical network with after fixed capacitor C connects through A.C. contactor CJ, and through circuit breaker ZD connection line user YH.A.C. contactor CJ is controlled by the zero current input that is attached thereto and confirms circuit ZC, power factor that links to each other with voltage transformer with electrical network main circuit current instrument transformer and the output of display circuit PFC are connected to circuit for controlling motor MC, the output of circuit for controlling motor MC is connected with motor M, capacitance current that links to each other with autotransformer B limit switch in the device and the output of voltage detecting circuit CVD are connected with motor M, and the output of motor M is connected to the sliding contact of automatic coupling voltage regulator B.
Circuit breaker ZD installs electricly after closing a floodgate, and motor M is rotated, and makes autotransformer B sliding contact put position topmost, even variable voltage source U
VReach maximum, after the zero current input confirms that circuit ZC confirms, make A.C. contactor CJ automatic closing, make compensation fixed capacitor C under the zero current condition, insert electrical network, power factor and display circuit PFC detect power factor of electric network subsequently, and by motor positive inversion control circuit MC control motor M forward or reverse, to change variable voltage source U
VNumerical value, reach the The optimal compensation effect.Capacitance current and the continuous monitor flows of voltage detecting circuit CVD are crossed the electric current and the terminal voltage value of electric capacity, during if any overrate trend, allow motor M rotate to increase U
VNumerical value, guaranteeing in the line voltage overvoltage or to avoid when big harmonic voltage component is arranged capacitor C to damage, but do not influence in this case this device to the compensate function of power system reactive power because of overvoltage or overload.
In one embodiment of the invention, the electrical network rated line voltage is 400V, and every maximum capacitive that provides mutually is idle for 10Kvar, one in the 665 μ f capacitors of whenever being connected, and the apparent power of the automatic coupling voltage regulator of employing is 2.5KVA.
Claims (7)
1, a kind of electric network reactive-load continuous compensating method, it is characterized in that comprising the steps: 1) maximum offset current (ic) max that produces according to every branch road needs chooses a single fixed capacitor (C), be C=(ic) max/U ω, wherein U is the grid line voltage of access leg or the effective value of phase voltage, and ω is the angular frequency of electric network source; 2) fixed capacitor (C) and variable voltage source (UV) are in series back is inserted between the phase line-phase line or phase line-center line of electrical network; 3) produce size from 0-U, phase place, variable voltage source (UV) that frequency is identical with power supply with autotransformer or inverter, the numerical value of required variable voltage source (UV) requires the actual ic value that produces offset current according to every branch road, is obtained by formula ic=(ic) max (1-UV/U); 4) by zero current commutation circuit (ZC) monitoring variable voltage source (UV) value, when confirming UV=U, A.C. contactor (LJ) is closed a floodgate, make building-out capacitor insert electrical network, to realize the zero current input together with variable voltage source; 5) by current transformer and voltage transformer detect user's electric current and voltage mutually, make coupled power factor and display circuit (PFC) show power factor value, when power factor is crossed when low, its output drives the forward and backward of motor (M) by control circuit or controller or changes the triggering signal of inverter, to change variable voltage source Uv numerical value, thereby change offset current ic value, to reach best compensation effect.
2, a kind of electric network reactive-load Continuous Compensation device of implementing the method for claim 1, the sliding contact that it is characterized in that autotransformer (B) is with after fixed capacitor (C) is connected, insert electrical network through A.C. contactor (CJ), A.C. contactor (CJ) confirms that with the zero current input circuit (ZC) links to each other, the power factor that links to each other with voltage transformer with electrical network main circuit current instrument transformer and the output of display circuit (PFC) are connected to circuit for controlling motor (MC), the output of circuit for controlling motor (MC) is connected with motor (M), the capacitance current that links to each other with autotransformer (B) limit switch and the output of voltage detecting circuit (CVD) are connected with motor (M), and the output of motor (M) is connected to the sliding contact of autotransformer (B).
3, a kind of electric network reactive-load Continuous Compensation device of implementing the method for claim 1 is characterized in that by transformer (T2), controller (CR), DC power supply (U
D) and inverter (IT) composition variable voltage source (U
V), DC power supply (U
D) be connected with inverter (IT), the alternating voltage output of inverter (IT) is connected with transformer (T2), inserts electrical network after the output of transformer (T2) is connected with fixed capacitor (C).
4, as the said electric network reactive-load Continuous Compensation of claim 2 device, the sliding contact output that it is characterized in that autotransformer (B) is connected on the electrical network phase line with after fixed capacitor (C) is connected---between the center line.
5, as the said electric network reactive-load Continuous Compensation of claim 2 device, the sliding contact output that it is characterized in that autotransformer (B) is connected on the electrical network phase line with after fixed capacitor (C) is connected---between the phase line.
6,, it is characterized in that autotransformer (B) and low-tension supply (U/n) and connect that the output of its sliding contact is connected with electric capacity (C) by step-up transformer (T1) and inserted electrical network again as the said electric network reactive-load Continuous Compensation of claim 2 device.
7, as the said electric network reactive-load Continuous Compensation of claim 2 device, it is characterized in that low pressure autotransformer (B) inserts high-voltage fence by step-down reactor (L), the output of its sliding contact is connected with electric capacity (C) by step-up transformer (T1) and is inserted electrical network again.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 00125031 CN1101070C (en) | 2000-09-05 | 2000-09-05 | Electric network reactive-load continuous compensation method and its compensation equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00125031 CN1101070C (en) | 2000-09-05 | 2000-09-05 | Electric network reactive-load continuous compensation method and its compensation equipment |
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| CN1282130A CN1282130A (en) | 2001-01-31 |
| CN1101070C true CN1101070C (en) | 2003-02-05 |
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| CN 00125031 Expired - Fee Related CN1101070C (en) | 2000-09-05 | 2000-09-05 | Electric network reactive-load continuous compensation method and its compensation equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347923C (en) * | 2004-10-13 | 2007-11-07 | 哈尔滨工业大学 | Static reactive compensator able to continuously regulating capacity reactive |
| CN101142731B (en) * | 2005-02-23 | 2011-12-07 | 歌美飒创新技术公司 | Method and device for injecting reactive current during a mains supply voltage dip |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330066C (en) * | 2003-09-12 | 2007-08-01 | 贵州工业大学 | Method for adjusting reactive power of capacitor and apparatus therefor |
| CN100367621C (en) * | 2005-06-16 | 2008-02-06 | 上海交通大学 | High-voltage network high-capacity powerfree compensation continuous regulation method |
| CN102221642B (en) * | 2010-04-16 | 2013-09-18 | 浙江容大电力设备制造有限公司 | Power factor sampling method and power factor compensation equipment |
| CN102904260A (en) * | 2012-09-24 | 2013-01-30 | 长兴县供电局 | Low-voltage capacitor equipment, reactive compensation control system and reactive compensation control method |
| FI124025B (en) * | 2012-11-22 | 2014-02-14 | Abb Technology Ag | Reactive power compensator for electric grid |
| CN104202020B (en) * | 2014-06-12 | 2017-07-25 | 武汉武新电气科技有限公司 | A kind of reactive power compensator and its control method |
| CN106094952A (en) * | 2016-07-25 | 2016-11-09 | 成都翰道科技有限公司 | A kind of automatic AC regulated power supply based on voltage detecting circuit |
| CN107239094B (en) * | 2017-08-14 | 2018-08-24 | 高玉琴 | A kind of power factor setter |
-
2000
- 2000-09-05 CN CN 00125031 patent/CN1101070C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100347923C (en) * | 2004-10-13 | 2007-11-07 | 哈尔滨工业大学 | Static reactive compensator able to continuously regulating capacity reactive |
| CN101142731B (en) * | 2005-02-23 | 2011-12-07 | 歌美飒创新技术公司 | Method and device for injecting reactive current during a mains supply voltage dip |
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| Publication number | Publication date |
|---|---|
| CN1282130A (en) | 2001-01-31 |
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