CN101847874B - Wattless current tracking method of static var compensator based on power balance - Google Patents
Wattless current tracking method of static var compensator based on power balance Download PDFInfo
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Abstract
The invention provides a wattless current tracking method of a static var compensator based on power balance, which comprises the following steps: firstly, sampling three phases of phase voltage and phase current of the low voltage side of a transformer; calculating wattless power required by a load; using the calculated wattless power as the wattless power output reference valve of STATCOM; and calculating the pure wattless reference current required to be output by STATCOM through combining the voltage of a compensating point so that the compensated wattless power is balanced with the wattless power required by the load when the actual output current equals to the pure wattless reference current. The pure wattless reference current carries out dq0 decomposition, the wattless component of the total reference current can be extracted, and the PI link output for controlling the direct current capacitance voltage of the STATCOM is used as wattful component of the total reference current, so the wattful component and the wattless component of the current can respectively carry out current PI control, and the output of the STATCOM can be controlled. In the invention, the setting of the compensating point of the STATCOM is not limited by the load current measuring point, and the compensating point can be flexibly set at each side of the transformer, so the size of the output voltage and the compensating current of the compensator can be reasonably selected.
Description
Technical field
The present invention relates to a kind of control method of SVC, be specifically related to a kind of Wattless current tracking method of the SVC based on power-balance.
Background technology
In distribution system, for improving the on high-tension side power factor of distribution transformer, improve the quality of power supply of electrical network, the low-pressure side at distribution transformer is provided with reactive power compensator usually.SVC (hereinafter to be referred as STATCOM) is a kind of reactive power compensator of extensive use; Need compensate dynamically the required reactive power of load the in service of STATCOM; When the required reactive power change of load; Require the reactive power of STATCOM output also can automatically follow the tracks of compensation, this is to be realized by the Wattless current tracking method of STATCOM.
At present, traditional Wattless current tracking method employing dq0 of STATCOM decomposes the method that directly extracts the load reactive current and make the reactive current tracking load reactive current of STATCOM output in the distribution system: to load current i
LCarry out dq0 and decompose q shaft current component i
LqRepresent the idle component of load current, thereby extract the idle component i of load current
Lq, make STATCOM output always equal the idle component i of load current with reference to the idle component of electric current
Lq, and always confirm according to the controlling unit of STATCOM dc capacitor voltage with reference to the real component of electric current.Equally the actual output current of STATCOM is made dq0 and decompose, extract the real component i of output current
OdWith idle component i
OqAs the current feedback amount; Real component and idle component to output current are carried out current closed-loop proportional integral (PI) control respectively; Generate control signal; Thereby form the switch of power electronic device among the trigger impulse control STATCOM, make the reactive current of STATCOM output follow the tracks of the variation of load reactive current, to reach the purpose of STATCOM dynamic compensation load reactive power.
Traditional Wattless current tracking method is because directly the reference value of the idle component that extracts in the load measure electric current as idle component in the STATCOM offset current, so the application scenario that the reactive current that only is applicable to the STATCOM compensation equates with the required reactive current of load that the load current measurement point records.With accompanying drawing 1 is example; When the load current measurement point is arranged on step down side L; The compensation point of STATCOM just can only be arranged on the low-pressure side L of transformer, and the offset current idle component of injecting the L side this moment must equate with the load current idle component that the L side measures; If compensation point has been crossed on the tertiary winding M of tap T or peripheral hardware that transformer is arranged on high-pressure side H, transformer; After the progress of disease of having passed through transformer; There are the difference of amplitude and phase place in offset current and load current; Then the idle component of load current no longer can be as the idle component reference value of the actual current of STATCOM output, and traditional Wattless current tracking method will be no longer suitable.Therefore, conventional method has limited the position that compensation point is provided with, and is unfavorable for choosing flexibly of compensation way.
Summary of the invention
The object of the present invention is to provide a kind of Wattless current tracking method of static var compensator based on power-balance, this method can realize compensation way more flexibly.
A kind of Wattless current tracking method of static var compensator provided by the invention based on power-balance; In whole process; Maintenance is carried out equal interval sampling to the three-phase phase voltage and the SVC output three-phase phase current of step down side three-phase phase voltage and phase current, SVC compensation point; It is characterized in that this method comprises following detailed process:
The 1st step was got current sampling instant for calculating the zero hour, was made as t
0, establishing T is the electrical network power frequency period, utilizes t
0Be carved into t during-T
0The three-phase phase voltage of step down side and the sampled value data of phase current calculate t constantly
0The amplitude V of moment low-pressure side three-phase phase voltage
Lam, V
Lbm, V
LcmAnd phase place
And the amplitude I of low-pressure side three-phase phase current
Lam, I
Lbm, I
LcmAnd phase place
Calculate the phase difference between phase voltage and the phase current
Third calculates
T0The required three phase reactive power Q of load constantly
L
The 2nd step was utilized t
0Be carved into t during-T
0The sampled value data of SVC compensation point phase voltage calculate t constantly
0The amplitude V of moment compensation point place phase voltage
Oam, V
Obm, V
OcmAnd phase place
Calculate the pure idle reference current of SVC output three-phase at t according to formula (1) (2) (3) then
0Instantaneous value i constantly
QRa(t
0), i
QRb(t
0), i
QRc(t
0);
The 3rd step is with the synthesized voltage vector V of compensation point voltage
O &Direction during as the d direction of principal axis of dq0 rotating coordinate system, output current vector I
O &Projection i on the d axle
OdThe real component of expression output current, the projection i on the q axle
OqThe idle component of expression output current; In view of the above SVC is exported pure idle reference current and carry out of the coordinate transform of abc three phase coordinate systems, obtain SVC and export pure idle reference current t to the dq0 rotating coordinate system
0Three-phase instantaneous value i constantly
QRa(t
0), i
QRb(t
0), i
QRc(t
0) component i under the dq0 coordinate system
QRd(t
0), i
QRq(t
0), i
QR0(t
0);
And the compensation point place actual output current phase of SVC that sampling is obtained is at t
0Three-phase instantaneous value i constantly
Oa(t
0), i
Ob(t
0), i
Oc(t
0) carry out coordinate transform, obtain their component i under the dq0 rotatable coordinate axis respectively
Od(t
0), i
Oq(t
0), i
O0(t
0);
The output of voltage ratio integral element that the 4th step will be controlled the SVC dc capacitor voltage is as t
0Constantly always with reference to the real component i of electric current
Rd(t
0); Go on foot the t that calculates with the above-mentioned the 3rd
0The q axle component i of pure idle reference current of the moment
QRq(t
0) as always with reference to the q axle idle component i of electric current
Rq(t
0), calculate i
Rd(t
0) and i
Od(t
0) difference DELTA i
d(t
0), and i
Rq(t
0) and i
Oq(t
0) difference DELTA i
q(t
0);
The Δ i that the 5th step obtained above-mentioned the 4th step
d(t
0) and Δ i
q(t
0) make system stable operation through the computing of current ratio integral element respectively, this moment current ratio integral element output variable respectively as the d axle component v of static reactive compensator voltage controlled quentity controlled variable under the dq0 coordinate system
Pd(t
0) and q axle component v
Pq(t
0), the O axle component v of voltage control quantity
P0(t
0) be made as 0;
To v
Pd(t
0), v
Pq(t
0), v
P0(t
0) carry out the coordinate transform that the dq0 rotational coordinates is tied to abc three phase coordinate systems, obtain the modulation wave signal instantaneous value v of pwm pulse generator under the abc coordinate system
Pa(t
0), v
Pb(t
0), v
Pc(t
0);
The 6th step is with modulation wave signal instantaneous value v
Pa(t
0), v
Pb(t
0), v
Pc(t
0) through the switch of power electronic device in the PWM modulation production burst signal controlling SVC, control SVC output AC voltage and electric current;
The 7th step was waited for next sampling instant, changed for the 1st step over to, repeated the 1st and went on foot for the 7th step, until shutdown.
The inventive method is at first sampled to the three-phase phase voltage and the phase current of step down side; Calculate the required reactive power of load; With the reactive power output reference value of the required reactive power of load as STATCOM; Calculate the pure idle reference current that STATCOM need export in conjunction with the voltage of compensation point, make when the STATCOM actual output current equals this pure idle reference current the reactive power equilibrium that the reactive power of compensation and load are required.This pure idle reference current is carried out dq0 decompose the idle component always to extract with reference to electric current; With voltage ratio integration (PI) the link output of control STATCOM dc capacitor voltage as always with reference to the real component of electric current; Thereby can carry out current closed-loop proportional integral (PI) control respectively to the real component and the idle component of electric current, thereby generate the output of control signal control STATCOM.Particularly, the present invention has following technique effect:
(1) the inventive method can make the setting of the compensation point (hereinafter to be referred as compensation point) of STATCOM not receive the restriction of load current measurement point.When the load current measurement point is arranged on step down side; The compensation point of compensation arrangement can be crossed over transformer; Be arranged on high-pressure side, the tertiary winding or the transformer tapping of transformer, help utilizing the electric parameters information of the many sides of transformer, thereby realize compensation way more flexibly.
(2) select output voltage and the offset current size that the position of compensation point can the reasonable selection compensation arrangement flexibly; Thereby make full use of the voltage endurance capability of power electronic device; The current value that the choose reasonable power electronic device is passed through helps reducing the cost of reactive power compensator.
(3) construct the pure idle reference current of STATCOM needs output according to the phase voltage at required reactive power of step down side and STATCOM compensation point place; Make the reactive component of STATCOM actual output current follow the tracks of this pure idle reference current through control; Guarantee the reactive power and the load reactive power equilibrium of STATCOM output, thereby reach the purpose of the required reactive power of dynamic tracking compensating load.
Description of drawings
Fig. 1 is that the configuration schematic diagram of SVC reaches the Wattless current tracking method sketch map based on power-balance
Fig. 2 is the sketch map of STATCOM compensation point voltage vector, current phasor and abc three phase coordinate systems, dq0 rotating coordinate system
Fig. 3 is a STATCOM simulation model sketch map
Fig. 4 is simulation model transformer high-voltage side (compensation point) A phase voltage waveform
Fig. 5 is a simulation model STATCOM A phase output current wave
Fig. 6 is a transformer high-voltage side A phase current waveform after the simulation model reactive power compensation
Embodiment
The method that the present invention proposes is specifically related to a kind of Wattless current tracking method of the SVC based on power-balance; Through calculating the required reactive power of load, just can realize of the tracking compensation of STATCOM output reactive current to the required reactive current of load in conjunction with the phase voltage and the phase current at STATCOM compensation point place.Because this method is based on the notion of power-balance in the electric power system; The reactive power that the employing load is required and the voltage of compensation point calculate the needs of STATCOM and export pure idle reference current; When this pure idle reference current during as the idle reference current of STATCOM actual output current; Compensating power and the required reactive power of load that can guarantee STATCOM output equate; Therefore be referred to as Wattless current tracking method of static var compensator, hereinafter to be referred as the power-balance Wattless current tracking method based on power-balance.
Power-balance Wattless current tracking method principle: the demand of electric power system the inside power is a balance with supplying with; As long as confirm the reactive power of need of load compensation; And make the compensation point voltage of STATCOM and the reactive power of output current calculating gained equal the required reactive power of load, just can reach compensation effect.Different according to selected compensation point voltage, it is also different that STATCOM need export the reactive power compensation electric current.The reactive power compensation electric current of the actual output of STATCOM not necessarily will equate with the reactive component of load current at this moment.Through selecting suitable STATCOM output voltage and electric current, guarantee to inject and the identical reactive power of the required reactive power of load at the compensation point place, make reactive power obtain balance, thereby it is idle to reach compensating load, improve the purpose of power factor of electric network.
Below through by embodiment the present invention being described in further detail, but following examples only are illustrative, and protection scope of the present invention does not receive the restriction of these embodiment.
As shown in Figure 1; If step down side L is load voltage and current measurement point; In the power-balance Wattless current tracking method, the compensation point of STATCOM can be not limited to be arranged on transformer side pressure side L, and compensation point can be crossed over transformer; Be chosen in transformer high-voltage side H, tapping T, perhaps carry out reactive power compensation on the tertiary winding M of peripheral hardware.Fig. 1 is located at the situation that step down side L, compensation point are located at transformer high-voltage side H for load voltage and current measurement point, and when compensation point was located on the tertiary winding M of T or peripheral hardware on the tapping, calculation procedure was identical with following step.
In following whole process; Maintenance is carried out equal interval sampling to three-phase phase voltage and the STATCOM output three-phase phase current of step down side L three-phase phase voltage and phase current, STATCOM compensation point H; Sampling time interval is T/N; Wherein T is the electrical network power frequency period, and N is the positive integer of confirming according to the sample rate needs, obtains the instantaneous value of each sampling instant low-pressure side and compensation point three-phase phase voltage and phase current.
1, gets current sampling instant for calculating the zero hour, be made as t
0If T is the electrical network power frequency period, utilize t
0Be carved into t during-T
0The three-phase phase voltage of step down side L and the sampled value data of phase current go out t through the discrete fourier algorithm computation constantly
0The amplitude V of moment low-pressure side three-phase phase voltage
Lam, V
Lbm, V
LcmAnd phase place
And the amplitude I of low-pressure side three-phase phase current
Lam, I
Lbm, I
LcmAnd phase place
Calculate the phase difference between phase voltage and the phase current
Rating formula (1) according to based on phasor calculates t
0The required three phase reactive power Q of load constantly
L
2, utilize t
0Be carved into t during-T
0The sampled value data of the phase voltage of STATCOM compensation point H go out t through the discrete fourier algorithm computation constantly
0The amplitude V of moment compensation point place phase voltage
Oam, V
Obm, V
OcmAnd phase place
Can calculate the pure idle reference current of STATCOM output three-phase at t according to formula (2) (3) (4) then
0Instantaneous value i constantly
QRa(t
0), i
QRb(t
0), i
QRc(t
0);
Q wherein
LFor calculate the required three phase reactive power of load of gained by formula (1);
3, can know by accompanying drawing 2, the synthesized voltage vector V of compensation point H voltage
O &Direction during as the d direction of principal axis of rotation dq0 coordinate system, output current vector I
O &Projection i on the d axle
OdThe real component of expression output current, the projection i on the q axle
OqThe idle component of expression output current.In view of the above STATCOM is exported pure idle reference current and actual output current is carried out the coordinate transform of abc three phase coordinate system dq0 rotating coordinate systems.
Can obtain STATCOM by above-mentioned the 2nd step and export pure idle reference current t
0Instantaneous value i constantly
QRa(t
0), i
QRb(t
0), i
QRc(t
0), by formula (5) (6) (7) are to the i under the abc coordinate system
QRa(t
0), i
QRb(t
0), i
QRc(t
0) carry out conversion, obtain their component i under the dq0 coordinate system respectively
QRd(t
0), i
QRq(t
0), i
QR0(t
0):
The compensation point place actual output current phase of STATCOM that sampling is obtained is at t
0Instantaneous value i constantly
Oa(t
0), i
Ob(t
0), i
Oc(t
0) by formula (8) (9) (10) carry out of the conversion of abc three phase coordinate systems to the dq0 rotating coordinate system, obtain their component i under the dq0 rotating coordinate system respectively
Od(t
0), i
Oq(t
0), i
O0(t
0);
4, according to method to STATCOM reactive current and active current decoupling zero control, confirm STATCOM output always with reference to the real component i of electric current
RdWith idle component i
Rq
With the output of voltage ratio integration (PI) link of the stable control of STATCOM dc capacitor voltage as t
0Constantly always with reference to the real component i of electric current
Rd(t
0); Go on foot the t that calculates with the above-mentioned the 3rd
0The q axle component i of pure idle reference current of the moment
QRq(t
0) as always with reference to the q axle idle component i of electric current
Rq(t
0), calculate i according to formula (11) (12)
Rd(t
0) and i
Od(t
0) difference DELTA i
d(t
0), and i
Rq(t
0) and i
Oq(t
0) difference DELTA i
q(t
0).
Δi
d(t
0)＝i
Rd(t
0)-i
Od(t
0) (11)
Δi
q(t
0)＝i
Rq(t
0)-i
Oq(t
0) (12)
5, the Δ i that obtains above-mentioned the 4th step
d(t
0) and Δ i
q(t
0) respectively through the computing of current ratio integration (PI) link, regulating proportionality constant and the integral constant system that makes can stable operation, then the output variable of current ratio integration (PI) link is respectively the d axle component v of STATCOM voltage control quantity under the dq0 coordinate system
Pd(t
0) and q axle component v
Pq(t
0), the O axle component v of voltage control quantity
P0(t
0) be made as 0.
To v
Pd(t
0), v
Pq(t
0), v
P0(t
0) carrying out the coordinate transform that the dq0 rotational coordinates is tied to abc three phase coordinate systems, transformation for mula is (14) (15) (16), obtains the modulation wave signal instantaneous value v of pwm pulse generator under the abc coordinate system
Pa(t
0), v
Pb(t
0), v
Pc(t
0);
6, as shown in Figure 2, with modulation wave signal three-phase instantaneous value v
Pa(t
0), v
Pb(t
0), v
Pc(t
0) the input pwm pulse generator, through PWM modulation production burst signal controlling STATCOM power electronic device switch, control STATCOM output AC voltage and electric current.Under above-mentioned control algolithm, STATCOM be in operation output reactive current can follow the tracks of the variation of the required reactive current of load, the reactive power of real-Time Compensation need of load.
7, wait for next sampling instant, changed for the 1st step over to, repeat the 1st and went on foot for the 7th step, until shutdown.
Below for explanation power-balance Wattless current tracking method with the control effect, set up simulation model, the model sketch map is shown in accompanying drawing 3, the basic parameter declaration of model is following:
Power supply rated voltage line voltage effective value V
S: 800V
Power transmission line parameter: resistance R
S=0.4 Ω, inductance L
S=2.25mH
Connect reactance parameter: resistance R
F=0.1 Ω, inductance value L
F=4mH
Transformer parameter: capacity S
TN=50kVA, DY11 connects method, and no-load voltage ratio k=800V/380V is short
The anti-X of roadlock
k%=6%
Load on the active power P under the rated voltage 380V
L=30kW, the load reactive power Q
L=30kVar
Voltage close loop control ratio constant K
VP=0.5, integral constant K
VI=0.05
Current closed-loop control ratio constant K
IP=0.005, integral constant K
II=0.125
Before the STATCOM device put into operation, active power that load is required and reactive power were all provided through transformer by power supply, and transformer high-voltage side power factor is 0.73, and certain electric voltage dropping is arranged on the circuit, recorded load voltage 0.9 times for its rated value.
After STATCOM device input coefficient and stable operation, control system is 27.3kVar through the reactive power that sampled value calculates need of load.STATCOM compensation point phase voltage first-harmonic effective value is 450V when recording stable operation; Can construct the pure idle reference current that STATCOM need export by above-mentioned practical implementation step 2 in conjunction with the required reactive power of load, 90 ° in pure idle reference current phase-lag compensation point voltage phase place.With the pure idle reference current of three-phase through always extracting idle component after the coordinate transform with reference to electric current; Dc capacitor practical stability value is 1502V, and reference value is 1500V, and both differences always form the real component with reference to electric current through voltage ratio integral control (PI) link.With the STATCOM actual output current as feedback current and always with reference to electric current through current ratio integration (PI) decoupling zero control, generate modulation wave signal control STATCOM output required voltage and electric current.During stable operation, the first-harmonic effective value of STATCOM compensation point voltage and output current is respectively 450V and 20A, compensation point voltage A phase waveform such as Fig. 4; Output current A phase waveform such as Fig. 5; Both phase differences are 90.3 °, mainly export reactive power, absorb a small amount of active power; Load-side phase voltage and phase current first-harmonic effective value are respectively 209V and 62A, and phase difference is 45 °.Calculating the output reactive power respectively is 27.30kVar; The required reactive power of load is 27.31kVar; Basically realized that compensation point injects reactive power and load consumption reactive power equilibrium; Transformer high-voltage side source current A phase waveform such as Fig. 6, basic identical with relatively more visible high side voltage of high-pressure side (being compensation point) voltage waveform shown in Figure 5 and source current phase place, 0.73 when the high-pressure side power factor never compensates is increased to 0.99; And load voltage is increased to 0.96 times of its rated value, is higher than 0.9 times when not compensating.The idle reference current that wherein STATCOM followed the tracks of is to construct gained through calculating, and its phase current effective value is 20A; And the phase current effective value of three-phase reactive current is 43A in the load current.It is thus clear that under the power-balance Wattless current tracking method, the reactive current that STATCOM follows the tracks of is not directly to be worth the reactive current component in the load current as a reference, can remove to construct corresponding idle reference current according to the voltage of actual selection compensation point.Compensation point is arranged on the transformer high-voltage side in this emulation example; When reactive power that compensates and the required reactive power equilibrium of load; Higher compensation point voltage makes that the actual offset current reactive current more required than load is little, when reaching compensation effect, has also reduced the current value through power electronic device.
Claims (1)
1. Wattless current tracking method of static var compensator based on power-balance; In whole process; Maintenance is carried out equal interval sampling to the three-phase phase voltage and the SVC output three-phase phase current of step down side three-phase phase voltage and phase current, SVC compensation point; It is characterized in that this method comprises following detailed process:
The 1st step was got current sampling instant for calculating the zero hour, was made as t
0, establishing T is the electrical network power frequency period, utilizes t
0Be carved into t during-T
0The three-phase phase voltage of step down side and the sampled value data of phase current calculate t constantly
0The amplitude V of moment low-pressure side three-phase phase voltage
Lam, V
Lbm, V
LcmAnd phase place
And the amplitude I of low-pressure side three-phase phase current
Lam, I
Lbm, I
LcmAnd phase place
Calculate the phase difference between phase voltage and the phase current
Calculate t again
0The required three phase reactive power Q of load constantly
L
The 2nd step was utilized t
0Be carved into t during-T
0The sampled value data of SVC compensation point phase voltage calculate t constantly
0The amplitude V of moment compensation point place phase voltage
Oam, V
Obm, V
OcmAnd phase place
Calculate the pure idle reference current of SVC output three-phase at t according to formula (1) (2) (3) then
0Instantaneous value i constantly
QRa(t
0), i
QRb(t
0), i
QRc(t
0);
The 3rd step is with the synthesized voltage vector of the three-phase phase voltage of compensation point
Direction during as the d direction of principal axis of dq0 rotating coordinate system, the output current vector
Projection i on the d axle
OdThe real component of expression output current, the projection i on the q axle
OqThe idle component of expression output current; In view of the above the pure idle reference current of SVC output three-phase is carried out the coordinate transform of abc three phase coordinate systems to the dq0 rotating coordinate system, obtain SVC and export pure idle reference current t
0Three-phase instantaneous value i constantly
QRa(t
0), i
QRbt(t
0), i
QRc(t
0) component i under the dq0 rotating coordinate system
QRd(t
0), i
QRq(t
0), i
QR0(t
0);
And the compensation point place actual output current phase of SVC that sampling is obtained is at t
0Three-phase instantaneous value i constantly
Oa(t
0), i
Ob(t
0), i
Oc(t
0) carry out coordinate transform, obtain their component i under the dq0 rotatable coordinate axis respectively
Od(t
0), i
Oq(t
0), i
O0(t
0);
The output of voltage ratio integral element that the 4th step will be controlled the SVC dc capacitor voltage is as t
0Constantly always with reference to the real component i of electric current
Rd(t
0); Go on foot the t that calculates with the above-mentioned the 3rd
0The q axle component i of pure idle reference current of the moment
QRq(t
0) as always with reference to the q axle idle component i of electric current
Rq(t
0), calculate i
Rd(t
0) and i
Od(t
0) difference DELTA i
d(t
0), and i
Rq(t
0) and i
Oq(t
0) difference DELTA i
q(t
0);
The Δ i that the 5th step obtained above-mentioned the 4th step
d(t
0) and Δ i
q(t
0) make system stable operation through the computing of current ratio integral element respectively, this moment current ratio integral element output variable respectively as the d axle component v of static reactive compensator voltage controlled quentity controlled variable under the dq0 rotating coordinate system
Pd(t
0) and q axle component v
Pq(t
0), 0 component v of voltage control quantity
P0(t
0) be made as 0;
To v
Pd(t
0), v
Pq(t
0), v
P0(t
0) carry out the coordinate transform that the dq0 rotational coordinates is tied to abc three phase coordinate systems, obtain the modulation wave signal instantaneous value v of pwm pulse generator under abc three phase coordinate systems
Pa(t
0), v
Pb(t
0), v
Pc(t
0);
The 6th step is with modulation wave signal instantaneous value v
Pa(t
0), v
Pb(t
0), v
Pc(t
0) through the switch of power electronic device in the PWM modulation production burst signal controlling SVC, control SVC output AC voltage and electric current;
The 7th step was waited for next sampling instant, changed for the 1st step over to, repeated the 1st and went on foot for the 7th step, until shutdown.
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| CN102157948B (en) * | 2011-04-02 | 2012-11-21 | 华中科技大学 | Static var compensation device current detection method based on transient power balance |
| CN102222925B (en) * | 2011-06-15 | 2013-04-03 | 江苏省电力公司常州供电公司 | Phase current balance method for line current asymmetric compensation of D-STATCOM |
| CN103944171B (en) * | 2014-05-09 | 2015-12-09 | 北京四方继保自动化股份有限公司 | The circular current control method of a kind of corner connection chain type SVG |
| CN103972899B (en) * | 2014-05-15 | 2016-08-24 | 徐州中矿大传动与自动化有限公司 | A kind of STATCOM access point voltage compensating method |
| CN104377710A (en) * | 2014-11-13 | 2015-02-25 | 国网重庆市电力公司电力科学研究院 | Transformer reactive power compensation method and device |
| CN107947670B (en) * | 2017-12-15 | 2019-06-11 | 华中科技大学 | A kind of power factor control method of direct current biasing type motor |
| CN114123225B (en) * | 2021-11-19 | 2023-06-30 | 福州大学 | Control method of three-phase reactive power compensator based on double prediction control |
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| CN101232187A (en) * | 2008-01-30 | 2008-07-30 | 湖南大学 | Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance |
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| CN101232187A (en) * | 2008-01-30 | 2008-07-30 | 湖南大学 | Positive and negative order double ring stacking control method of electric power distribution static state synchronous compensator based on instantaneous power balance |
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