CN101699694B - Three-phase three-wire dynamic split-phase reactive power compensation device and control method thereof - Google Patents
Three-phase three-wire dynamic split-phase reactive power compensation device and control method thereof Download PDFInfo
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Abstract
The invention discloses a three-phase three-wire dynamic split-phase reactive power compensation device and a control method thereof. The device has the advantages of simple structure, low cost and good compensation effect, and is more suitable for a three-phase three-wire unbalanced system. The device is structurally characterized in that: the device comprises a current detection unit I; the input end of the current detection unit I is connected with compensated distribution circuits L1, L2 and L3 before the compensation or connected with compensated distribution circuits L1, L2 and L3 after the compensation, the output end of the current detection unit I is connected with a subtraction operation device, and the subtraction operation device is connected with a reactive power current calculating unit; the input end of a voltage detection unit is connected with the compensated distribution circuits L1, L2 and L3, and the output end of the voltage detection unit is connected with the reactive power current calculating unit; the reactive power current calculating unit is connected with a compensation control unit, and the compensation control unit is connected with a compensation device of a delta connection method; the input end of a current detection unit II is connected with the compensation device, and the output end of the current detection unit II is connected with the compensation control unit; and the compensation device is connected with the circuits L1, L2 and L3.
Description
Technical field
The invention belongs to distribution system reactive power compensation technical field, relate in particular to three-phase three-wire dynamic split-phase reactive power compensation device and control method thereof.
Background technology
Reactive power in the distribution system is followed the tracks of compensation, is to improve confession, using electricity system stability and the necessary technological means of operational efficiency.Known three phase reactive power compensator has star-like connection to be connected two kinds of structures with triangular form, respectively like Fig. 5 and shown in Figure 6.In three-phase balanced system, two kinds of structures all have extensive application, during compensator work, and three compensating unit adjusted in concert, the three-phase offset current amplitude of generation is identical, is commonly referred to as " three-phase synchronous compensator " or " three-phase is mended compensator altogether ".In three-phase unbalance system, need the reactive current in three phase lines be compensated respectively, promptly adopt each compensation method respectively mutually.The compensator of this kind purposes is commonly referred to as " phase splitting compensation device " or " three-phase divides the benefit compensator ".Known phase splitting compensation device all adopts star-like syndeton shown in Figure 7, the offset current of three compensating units respectively with three phase lines in reactive current corresponding one by one; The compensator that triangular form shown in Figure 6 connects owing to be difficult to is confirmed the corresponding relation of reactive current in offset current and three phase lines of three compensating units and is not used.Need four lines to be connected between the phase splitting compensation device of star-like syndeton and the distribution system, star-like connection mid point connects the center line of distribution system, can be used for the reactive power compensation in three-phase and four-line unbalanced system or the phase three-wire three unbalanced system.
Three-phase imbalance load in the commercial power normally is made up of the many single-phase loads that are distributed on the homophase not, and industrial single-phase load generally all adopts two phase lines power supplies, like ac arc wedling machine, ac spot welding machine, interchange butt welding machine etc.This type of load constitutes the phase three-wire three unbalanced system, does not need center line, does not also have current in middle wire.There is following shortcoming in phase splitting compensation device compensation phase three-wire three unbalanced system with known star-like syndeton shown in Figure 7:
1. the complex connection of compensator and distribution system needs four lines to connect, and in having the system of center line, can't not use because of satisfying connection request; If do not connect center line, the general cisco unity malfunction of compensator then.
2. three compensating units in the star-like syndeton phase splitting compensation device are connected on respectively between each phase line and the center line, follow the tracks of each phase load electric current of compensation respectively, and the three-phase offset current generally is inequality, so compensator is can the three characteristics of the middle term uneven and produce current in middle wire.But do not need center line in the phase three-wire three unbalanced system, do not have current in middle wire yet, more need not compensate current in middle wire.Therefore the current in middle wire of compensator generation is a kind of wrong compensation, can cause added burden to distribution transformer, causes harmful effects such as excess loss.
Summary of the invention
The object of the invention is exactly the phase splitting compensation device that overcomes a known star-like syndeton existing shortcoming when being used for the reactive power compensation of phase three-wire three unbalanced system; Provide a kind of simple in structure; Cost is low; Compensation effect is good, more is applicable to the three-phase three-wire dynamic split-phase reactive power compensation device and the control method thereof of phase three-wire three unbalanced system.
For realizing above-mentioned purpose, the present invention has taked following technical scheme:
A kind of three-phase three-wire dynamic split-phase reactive power compensation device is made up of compensating unit I, compensating unit II, compensating unit III, voltage detection unit, current transformer group I, current detecting unit I, subtraction unit HI, subtraction unit II, subtraction unit I, reactive current calculating unit, compensation control unit, current detecting unit II, current transformer group II.Two outputs of compensating unit I connect respectively by L1 and L2 in the compensation distribution line; Two outputs of compensating unit II connect respectively by L2 and L3 in the compensation distribution line; Two outputs of compensating unit III connect respectively by L3 and L1 in the compensation distribution line; The input termination of voltage detection unit is compensated distribution line L1, L2 and L3, and the output termination reactive-current meter of voltage detection unit is calculated the voltage input end of unit; The primary side of three current transformers is series at respectively among compensation preceding quilt compensation distribution line L1, L2 and the L3 among the current transformer group I, the input of secondary side joint current detecting unit I; Current detecting unit I is corresponding to "+" input of the output termination subtraction unit I of compensation distribution line L1 and "-" input of subtraction unit III; Current detecting unit I is corresponding to "+" input of the output termination subtraction unit II of compensation distribution line L2 and "-" input of subtraction unit I, and current detecting unit I is corresponding to "+" input of the output termination subtraction unit III of compensation distribution line L3 and "-" input of subtraction unit II; The output of subtraction unit I, subtraction unit II and subtraction unit III connects three current input terminals that reactive current is calculated the unit respectively; Reactive current is calculated the instruction current input of the output termination compensation control unit of unit; The primary side of three current transformers is series at respectively in the output loop of compensating unit I, compensating unit II and compensating unit III among the current transformer group II, the input of secondary side joint current detecting unit II; The feedback current input of the output termination compensation control unit of current detecting unit II; Three groups of control output ends of compensation control unit connect the control input end of compensating unit I, compensating unit II and compensating unit III respectively.
Two compensation outputs of compensating unit I, compensating unit II and each compensating unit of compensating unit III head and the tail successively are connected, and constitute triangular form and connect, and three head and the tail tie points are connected respectively with by L1, L2 and L3 in the compensation distribution line.
Compensating unit I, compensating unit II and compensating unit III have identical internal structure; Its internal structure is one group of compensation branch road that is composed in series by capacitor, reactor and control switch; Each branch road two ends is parallel with one another, is connected with two compensation outputs of compensating unit respectively; Each control switch is switched on or switched off by the control end control of compensating unit.
Compensating unit I, compensating unit II and compensating unit III have identical internal structure; Its internal structure is one group of compensation branch road that is composed in series by capacitor and control switch; Each branch road two ends is parallel with one another, is connected with two compensation outputs of compensating unit respectively; Each control switch is switched on or switched off by the control end control of compensating unit.
A kind of control method of three-phase three-wire dynamic split-phase reactive power compensation device, this method is:
(1) records by three line instantaneous voltage u12, u23 and u31 between compensation distribution line L1, L2, the L3 by voltage detection unit;
(2) record by three phase current instantaneous value i1, i2 and i3 in the compensation distribution line by current detecting unit I;
(3) obtain three difference current instantaneous values by subtraction unit I, subtraction unit II and subtraction unit III through subtraction:
i12＝i1-i2，i23＝i2-i3，i31＝i3-i1
(4) adopt known algorithm, calculate the unit by reactive current and calculate corresponding reactive power Q 12 according to u12 and i12; Calculate corresponding reactive power Q 23 according to u23 and i23; Calculate corresponding reactive power Q 31 according to u31 and i31, and obtain three corresponding reactive current effective values by following formula:
Wherein: U12, U23 and U31 are respectively the effective value of three line voltages between L1, L2, the L3.
(5) the compensation control unit produces corresponding offset current with Iq12, Iq23 and Iq31 as instruction current control compensation unit I, compensating unit II and compensating unit III respectively; Carry out reactive power compensation; And regulate compensating unit according to the testing result of current detecting unit II, offset current is met the requirements.
Adopt above scheme, detected each phase reactive current is converted into reactive current between line, and the compensating unit that connects with triangle compensates; A kind of method of the uneven using electricity system of phase three-wire three being carried out dynamic split-phase reactive power compensation is provided; Can correctly realize dynamic split-phase reactive power compensation to the phase three-wire three unbalanced system; And compensation arrangement need not connect the center line in the distribution system; Overcome existing same device and must connect the center line in the distribution system, and can produce the shortcoming of harmful current in middle wire.
The invention has the beneficial effects as follows:
(1) a kind of dynamic split-phase reactive power compensation device and control method thereof that adopts triangular form to connect three compensating units is provided;
(2) can carry out dynamic split-phase reactive power compensation to the uneven using electricity system of the phase three-wire three that does not possess center line, the dynamic split-phase reactive power compensation device that has overcome star-like connection can not be used for not possessing the shortcoming of the uneven using electricity system of phase three-wire three of center line;
(3) dynamic split-phase reactive power compensation device is connected with distribution line is three-way, need not connect center line, has simplified connected mode, the convenient use;
Can not produce harmful current in middle wire when (4) compensation arrangement is worked.
Description of drawings
Fig. 1 is the first embodiment of the invention structural representation.
Fig. 2 is the second embodiment of the invention structural representation.
Fig. 3 is the internal structure sketch map of compensating unit according to the invention.
Fig. 4 is the internal structure sketch map of compensating unit according to the invention.
Fig. 5 is three synchronised reactive power compensator sketch mapes of the star-like connection of known compensating unit.
Fig. 6 is the three synchronised reactive power compensator sketch mapes that known compensating unit triangular form connects.
Fig. 7 is the phase splitting compensation reactive power compensator sketch map of the star-like connection of known compensating unit.
Wherein: 1. compensating unit I, 2. compensating unit II, 3. compensating unit III, 4. voltage detection unit, 5. current transformer group I, 6. current detecting unit I, 7. subtraction unit III, 8. subtraction unit II, 9. subtraction unit I, 10. reactive current is calculated unit, 11. compensation control units, 12. current detecting unit II, 13. current transformer group II, 14. capacitors, 15. reactors, 16. control switchs.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is a first embodiment of the invention.
A kind of three-phase three-wire dynamic split-phase reactive power compensation device as shown in Figure 1 is made up of compensating unit I 1, compensating unit II 2, compensating unit III3, voltage detection unit 4, current transformer group I 5, current detecting unit I 6, subtraction unit III 7, subtraction unit II 8, subtraction unit I 9, reactive current calculating unit 10, compensation control unit 11, current detecting unit II12, current transformer group II 13.Two outputs of compensating unit I 1 connect respectively by L1 and L2 in the compensation distribution line; Two outputs of compensating unit II 2 connect respectively by L2 and L3 in the compensation distribution line; Two outputs of compensating unit III 3 connect respectively by L3 and L1 in the compensation distribution line; The input termination of voltage detection unit 4 is compensated distribution line L1, L2 and L3, and the output termination reactive-current meter of voltage detection unit 4 is calculated the voltage input end of unit 10; The primary side of three current transformers is series at respectively among compensation preceding quilt compensation distribution line L1, L2 and the L3 among the current transformer group I 5, the input of secondary side joint current detecting unit I 6; Current detecting unit I 6 is corresponding to "+" input of the output termination subtraction unit I 9 of compensation distribution line L1 and "-" input of subtraction unit III 7; Current detecting unit I 6 is corresponding to "+" input of the output termination subtraction unit II 8 of compensation distribution line L2 and "-" input of subtraction unit I 9, and current detecting unit I 6 is corresponding to "+" input of the output termination subtraction unit III 7 of compensation distribution line L3 and "-" input of subtraction unit II 8; The output of subtraction unit I 9, subtraction unit II 8 and subtraction unit III 7 connects three current input terminals that reactive current is calculated unit 10 respectively; Reactive current is calculated the instruction current input of the output termination compensation control unit 11 of unit 10; The primary side of three current transformers is series at respectively in the output loop of compensating unit I 1, compensating unit II 2 and compensating unit III 3 among the current transformer group II 13, the input of secondary side joint current detecting unit II 12; The feedback current input of the output termination compensation control unit 11 of current detecting unit II 12; Three groups of control output ends of compensation control unit 11 connect the control input end of compensating unit I 1, compensating unit II 2 and compensating unit III 3 respectively.
Two compensation outputs of compensating unit I 1, compensating unit II 2 and compensating unit III 3 each compensating unit head and the tail successively are connected, and constitute triangular form and connect, and three head and the tail tie points are connected respectively with by L1, L2 and L3 in the compensation distribution line.
Compensating unit I 1, compensating unit II 2 and compensating unit III 3 have identical internal structure; Its internal structure is one group of compensation branch road that is composed in series by capacitor 14, reactor 15 and control switch 16; Each branch road two ends is parallel with one another, is connected with two compensation outputs of compensating unit respectively; Each control switch 16 is switched on or switched off by the control end control of each compensating unit, referring to Fig. 3.
Perhaps compensating unit I 1, compensating unit II 2 and compensating unit III 3 have identical internal structure; Its internal structure is one group of compensation branch road that is composed in series by capacitor 14 and control switch 16; Each branch road two ends is parallel with one another, is connected with two compensation outputs of each compensating unit respectively; Each control switch 16 is switched on or switched off by the control end control of compensating unit, referring to Fig. 4.
The control method of three-phase three-wire dynamic split-phase reactive power compensation device, this method is:
(1) records by three line instantaneous voltage u12, u23 and u31 between compensation distribution line L1, L2, the L3 by voltage detection unit 4;
(2) record by three phase current instantaneous value i1, i2 and i3 in the compensation distribution line by current detecting unit I 6;
(3) obtain three difference current instantaneous values by subtraction unit I 9, subtraction unit II 8 and subtraction unit III 7 through subtraction:
i12＝i1-i2，i23＝i2-i3，i31＝i3-i1
(4) adopt known algorithm, calculate unit 10 by reactive current and calculate corresponding reactive power Q 12 according to u12 and i12; Calculate corresponding reactive power Q 23 according to u23 and i23; Calculate corresponding reactive power Q 31 according to u31 and i31, and obtain three corresponding reactive current effective values by following formula:
Wherein: U12, U23 and U31 are respectively the effective value of three line voltages between L1, L2, the L3.
(5) compensation control unit 11 produces corresponding offset current with Iq12, Iq23 and Iq31 as instruction current control compensation unit I 1, compensating unit II 2 and compensating unit III 3 respectively; Carry out reactive power compensation; And regulate compensating unit according to the testing result of current detecting unit II 12, offset current is met the requirements.
Adopt such scheme; Current detecting unit I 6 detects threephase load current i 1, i2 and i3 through current transformer group I 5; And calculate three instruction current Iq12, Iq23 and Iq31; Compensation control unit 11 is controlled three control switchs 16 in the compensating unit respectively according to Iq12, Iq23 and Iq31 and predetermined control logic control, connects the suitable compensation branch road, produces corresponding compensation electric current I c12, Ic23 and Ic31; And whether correct according to the testing result judgement compensation of current detecting unit II 13 couples of Ic12, Ic23 and Ic31, carry out necessary adjusting or processing.The target of this control logic is followed the tracks of Iq12, Iq23 and Iq31 respectively for keeping Ic12, Ic23 and Ic31; When the Ic of correspondence * * and Iq * * when difference between the two surpasses pre-set limit; Then control the on off operating mode that the adjustment of corresponding compensation unit respectively compensates branch road; Reduce difference, keep Ic * * to Iq * * tracking.11 pairs of three compensating units of compensation control unit are independently regulated respectively, can realize the phase splitting compensation to unbalanced load; When load current changes, compensation arrangement will be realized dynamic compensation from the motion tracking load variations.
Voltage detection unit 4 in the said three-phase three-wire dynamic split-phase reactive power compensation device, two current detecting units, each subtraction unit, reactive current calculate unit 10 and compensation control unit 11 is known technology.For example voltage detection unit available sampling transformer or voltage transformer and LM324 operational amplifier are realized; Current detecting unit can be realized by sampling resistor and LM324 operational amplifier; The subtraction unit can adopt the LM324 operational amplifier to realize, or adopts digital signal processor such as TMS320F2812 after mould/number conversion, to realize through the digital operation method; Reactive current is calculated unit 10 and all can be adopted digital signal processor such as TMS320F2812 through digital operation and logical calculation method realization with compensation control unit 11.
Embodiment 2:
Fig. 2 is a second embodiment of the invention.Different with first embodiment is; Among the current transformer group I 5 primary side of three current transformers be series at respectively after the compensation by among compensation distribution line L1, L2 and the L3; What current detecting unit I 6 detected is the compensation after-current among distribution line L1, L2 and the L3 that compensated after the compensation, therefore belongs to closed-loop adjustment (first embodiment then belongs to adjusted open loop).This moment is except that current transformer group I 6 accesses are changed by the position of compensated line; The structure of device does not change; The method of calculating three instruction current Iq12, Iq23 and Iq31 does not change yet; But the compensation control unit is different according to logical AND first embodiment that Iq12, Iq23 and Iq31 control three compensating units, to adapt to the needs of closed-loop control.
The Iq of this moment * * be after the compensation Iq * *, because of offset current is opposite with load reactive current phase place, under non-overcompensation state, when Ic * * Iq of correspondence when increasing * * will reduce.The target of control logic is that Iq12, Iq23 and the Iq31 after keeping compensating all remains within the preset upper lower limit value scope (lower limit＞0 is to avoid overcompensation).Any Iq in Iq12, Iq23 and Iq31 * * when exceeding pre-set limit; Then control the on off operating mode that the adjustment of corresponding compensation unit respectively compensates branch road; Through change corresponding Ic * * change this Iq * *, make Iq after the compensation * * remain within the preset upper lower limit value scope.
For example, when Iq12 exceeded preset upper limit value, then control compensation unit I respectively compensated the on off operating mode of branch road through adjustment, increased offset current Ic12 reducing Iq12, thereby kept Iq12 after the compensation less than preset upper limit value; When Iq12 exceeded preset lower limit, then control compensation unit I respectively compensated the on off operating mode of branch road through adjustment, reduced offset current Ic12 increasing Iq12, thereby kept Iq12 after the compensation greater than preset lower limit.
When Iq23 exceeded preset upper limit value, then control compensation unit II respectively compensated the on off operating mode of branch road through adjustment, increased offset current Ic23 reducing Iq23, thereby kept Iq23 after the compensation less than preset upper limit value; When Iq23 exceeded preset lower limit, then control compensation unit II respectively compensated the on off operating mode of branch road through adjustment, reduced offset current Ic23 increasing Iq23, thereby kept Iq23 after the compensation greater than preset lower limit.
When Iq31 exceeded preset upper limit value, then control compensation unit III respectively compensated the on off operating mode of branch road through adjustment, increased offset current Ic31 reducing Iq31, thereby kept Iq31 after the compensation less than preset upper limit value; When Iq31 exceeded preset lower limit, then control compensation unit III respectively compensated the on off operating mode of branch road through adjustment, reduced offset current Ic31 increasing Iq31, thereby kept Iq31 after the compensation greater than preset lower limit.
Claims (8)
1. three-phase three-wire dynamic split-phase reactive power compensation device; It is characterized in that; It comprises current detecting unit I (6); Current detecting unit I (6) input through before current transformer group I (5) and the compensation by compensation distribution line L1, L2 is connected with L3 or with compensation after compensated distribution line L1, L2 is connected with L3, output is connected with subtraction device, subtraction device is connected with reactive current calculating unit (10); Voltage detection unit (4) input is connected with L3 with quilt compensation distribution line L1, L2, and output calculates unit (10) with reactive current and is connected; Reactive current is calculated unit (10) and is connected with compensation control unit (11), and compensation control unit (11) is connected with the compensation arrangement of delta connection; Current detecting unit II (12) input is connected with compensation arrangement through current transformer group II (13), and output is connected with compensation control unit (11); Compensation arrangement then is connected with circuit L1, L2 and L3.
2. three-phase three-wire dynamic split-phase reactive power compensation device as claimed in claim 1; It is characterized in that; Said compensation arrangement is made up of compensating unit I (1), compensating unit II (2) and compensating unit III (3), and two compensation outputs of each compensating unit head and the tail successively connect, and constitute triangle and connect; Two compensation outputs of compensating unit I (1) are link L1 and L2 respectively; Two compensation outputs of compensating unit II (2) are link L2 and L3 respectively; Two compensation outputs of compensating unit III (3) are link L3 and L1 respectively.
3. three-phase three-wire dynamic split-phase reactive power compensation device as claimed in claim 2; It is characterized in that; Said compensating unit I (1), compensating unit II (2) and compensating unit III (3) have identical internal structure; Its internal structure is one group of compensation branch road that is composed in series by capacitor (14), reactor (15) and control switch (16), and each branch road two ends is parallel with one another, is connected with two compensation outputs of compensating unit respectively; Each control switch is switched on or switched off by the control end control of compensating unit.
4. three-phase three-wire dynamic split-phase reactive power compensation device as claimed in claim 2; It is characterized in that; Said compensating unit I (1), compensating unit II (2) and compensating unit III (3) have identical internal structure; Its internal structure is one group of compensation branch road that is composed in series by capacitor (14) and control switch (16), and each branch road two ends is parallel with one another, is connected with two compensation outputs of compensating unit respectively; Each control switch is switched on or switched off by the control end control of compensating unit.
5. like claim 3 or 4 described three-phase three-wire dynamic split-phase reactive power compensation devices, it is characterized in that said control switch (16) is semiconductor solid-state switch or electric-controlled mechanical switch.
6. three-phase three-wire dynamic split-phase reactive power compensation device as claimed in claim 1; It is characterized in that; Said subtraction device comprises subtraction unit I (9), subtraction unit II (8), subtraction unit III (7); The output of corresponding each the quilt compensation distribution line L1 of current detecting unit I (6), L2 and L3 connects subtraction unit III (7), subtraction unit II (8), subtraction unit I (9) input respectively, and the output of subtraction unit I (9), subtraction unit II (8) and subtraction unit III (7) connects the input that reactive current is calculated unit (10) respectively.
7. three-phase three-wire dynamic split-phase reactive power compensation device as claimed in claim 2; It is characterized in that; The primary side of three current transformers is series at three respectively by among compensation distribution line L1, L2 and the L3 among the said current transformer group I (5), the input of secondary side joint current detecting unit I (6); The primary side of three current transformers is series at respectively in the output loop of compensating unit I (1), compensating unit II (2) and compensating unit III (3) among the said current transformer group II (13), the input of secondary side joint current detecting unit II (12).
8. a control method that is applicable to the said three-phase three-wire dynamic split-phase reactive power compensation device of claim 1 is characterized in that, its step is:
(1) records by three line instantaneous voltage u12, u23 and u31 between compensation distribution line L1, L2, the L3 by voltage detection unit (4);
(2) record by three phase current instantaneous value i1, i2 and i3 in the compensation distribution line by current detecting unit I (6);
(3) subtraction device comprises subtraction unit I (9), subtraction unit II (8) and subtraction unit III (7), and subtraction unit I (9), subtraction unit II (8) and subtraction unit III (7) obtain three difference current instantaneous values through subtraction:
i12＝i1-i2，i23＝i2-i3，i31＝i3-i1
(4) calculate the unit by reactive current and calculate corresponding reactive power Q 12 according to u12 and i12; Calculate corresponding reactive power Q 23 according to u23 and i23; Calculate corresponding reactive power Q 31 according to u31 and i31, and obtain three corresponding reactive current effective values by following formula:
Wherein: U12, U23 and U31 are respectively the effective value of three line voltages between L1, L2, the L3;
(5) compensation arrangement is made up of compensating unit I (1), compensating unit II (2) and compensating unit III (3); Compensation control unit (11) produces corresponding offset current with Iq12, Iq23 and Iq31 as instruction current control compensation unit I (1), compensating unit II (2) and compensating unit III (3) respectively; Carry out reactive power compensation; And regulate each compensating unit according to the testing result of current detecting unit II (12), offset current is met the requirements.
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| CN201556947U (en) * | 2009-10-29 | 2010-08-18 | 山东山大华天科技股份有限公司 | Three-phase three-wire dynamic split-phase reactive power compensation device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201556947U (en) * | 2009-10-29 | 2010-08-18 | 山东山大华天科技股份有限公司 | Three-phase three-wire dynamic split-phase reactive power compensation device |
Non-Patent Citations (1)
| Title |
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| 赵伟等.静止无功发生器与晶闸管投切电容器协同运行混合无功补偿***.《中国电机工程学报》.2009,第29卷(第19期),92-98. * |
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