CN102684204A - Cascading-type STATCOM DC side capacitor voltage balance control method - Google Patents
Cascading-type STATCOM DC side capacitor voltage balance control method Download PDFInfo
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Abstract
The invention relates to a cascading-type STATCOM (Static Synchronous Compensator) DC (Direct Current) side capacitor voltage balance control method. In the control method, the direct current control and the indirect current control are combined. The method comprises the following steps: generating an active current reference value; selecting a special bridge; generating an STATCOM output current reference value; carrying out indirect current control of the special bridge; and carrying out direct current control of a non-special bridge. The control method provided by the invention is used for controlling the cascading-type STATCOM DC side capacitor voltage balance. The method not only ensures the balance of a DC capacitor voltage between H bridges and improves the response speed of a control link and optimizes the system performance, but also does not require an additional hardware circuit and cannot ensure the hardware cost of a STATCOM device to be increased.
Description
Technical field
The present invention relates to solve tandem type STATCOM STATCOM (Static Synchronous Compensator; Be called for short STATCOM) control problem of dc capacitor voltage balance, be specifically related to a kind of control method of tandem type STATCOM dc capacitor voltage balance.
Background technology
At present, the STATCOM Reactive Power Control is divided into Direct Current Control and indirect current control two big classes.Direct Current Control, employing following-up type PWM control technology is carried out FEEDBACK CONTROL, the directly generation of control command electric current to the instantaneous value of current waveform.Indirect current control is phase place and the amplitude that produces the alternating voltage first-harmonic through control STATCOM inverter, comes the ac-side current of control STATCOM indirectly.Because the Direct Current Control method is the tracking Control to current instantaneous value, under the situation that switching frequency can meet the demands, the control system response speed is very fast.And the indirect current control method is not very high to the requirement of switching frequency, the big capacity STATCOM of normal and technological application in conjunction such as multipleization, many level, PWM control, but the response time is longer.
Cascade H bridge type multi-electrical level STATCOM is formed by the cascade of a plurality of voltage-type H bridge inverter, and the DC side of each cascade inverter unit provides voltage to support by capacitor.Because each dc bus capacitor device is relatively independent; If each unit power output loss and parameter unbalanced or each unit there are differences; Will cause the imbalance of each unit dc capacitor voltage; Thereby cause that the STATCOM control performance descends, even cause the dc bus capacitor overvoltage, threaten the device safe operation.
In the cascade multi-level STATCOM that adopts phase shift carrier wave PWM mode, the Balance Control strategy of dc capacitor voltage mainly comprises employing additional firmware circuit and does not adopt two big types of additional firmware circuit controls.
Adopt the method for additional firmware circuit to have: through come the equivalent loss of adjusting device at adjustable resistance of dc bus capacitor device parallel connection, based on the ac bus method of energy exchanging with adopt dc bus method of energy exchanging etc.Additional hardware circuit has increased the complexity of STATCOM circuit topological structure, has improved the control difficulty, has reduced the reliability of device, has increased device excess loss and cost.
Do not adopt the strategy of additional firmware circuit control dc capacitor voltage balance to mainly contain: based on the method control capacitance balance of voltage that the independent control strategy of the dc capacitor voltage of power signal, dc capacitor voltage hierarchical control strategy and employing phase-splitting transient current are followed the tracks of, list of references [1]-[4].
[1]J.A.Barrena，L.Marroyo，M.A.Rodriguez，et?al.DC?Voltage?Balancing?for?PWMCascaded?H-Bridge?Converter?Based?STATCOM.IEEE?IECON，Nov.7-10，2006，Paris，France：1840-1845.
[2]J.A.Barrena，L.Marroyo，M.A.Rodriguez.Individual?Voltage?Balancing?Strategy?for?PWM?Cascaded?H-Bridge?Converter-Based?STATCOM.IEEE?Transactions?on?Industrial?Electronics，2008，55(1)：21-29.
[3] Zhao Ruibin, Qiu Yufeng, Jing Ping. the DC side voltage control method of a kind of cascade STATCOM. power electronics, 2009 (4): 18-22.
[4]LIU?Zhao，SHI?Yan-jun，DUAN?Shan-xu，et?al.The?Research?of?DC?Capacitance?Voltage?Balancing?Strategy?Based?on?Cascade?STATCOM?Using?Individual?Phase?Instantaneous?Current?Tracking.IEEE?6
th?International?Power?Electronics?and?Motion?Control?Conference-ECCE?Asia.May?17-20，2009，Wuhan，China：1136-1140.
Summary of the invention
Problem to prior art exists the purpose of this invention is to provide a kind of comprehensive current control method, is used for cascade multi-level STATCOM dc capacitor voltage Balance Control.This method has not only guaranteed the balance of dc capacitor voltage between each H bridge, improved controlling unit response speed, optimized systematic function, also need not the additional firmware circuit, can not increase the hardware cost of STATCOM STATCOM device.
The objective of the invention is to adopt following technical proposals to realize:
A kind of tandem type STATCOM dc capacitor voltage balance control method, its improvements are that said control method comprises that Direct Current Control and indirect current control combine;
Said method comprises the steps:
A, generation active current reference value;
B, select special bridge;
C, generation STATCOM output current reference value;
D, the control of special bridge indirect current;
E, non-special bridge Direct Current Control.
A kind of optimized technical scheme provided by the invention is: said Direct Current Control comprises FEEDBACK CONTROL current waveform instantaneous value, the generation of control command electric current; Said indirect current control is meant phase place and the amplitude that produces the alternating voltage first-harmonic through control STATCOM STATCOM, controls the ac-side current of STATCOM STATCOM indirectly.
Second optimized technical scheme provided by the invention is: active current reference value generation unit realizes that said steps A generates the active current reference value; Said active current reference value generation unit comprises adder I, multiplier I, subtracter I and integrator I;
Said steps A comprises the steps:
A, make the input variable of said active current reference value generation unit with N dc capacitor voltage measured value, the output variable that is about to the meter meter is input among the adder I sues for peace, and obtains and is worth;
B, said step a with value and constant amount 1/N input variable as multiplier I, the output variable of said multiplier I is the mean value of N dc capacitor voltage;
C, said mean value and dc capacitor voltage reference value are input to subtracter I, and the output variable of said subtracter I is the dc capacitor voltage error amount;
D, said dc capacitor voltage error amount are input to integrator I and carry out integration, and the result of integration gained is the active current reference value.
The 3rd optimized technical scheme provided by the invention is: special bridge selected cell realizes that said step B selects special bridge; Said special bridge selected cell comprises N subtracter and comparator I;
Said step B comprises the steps:
(1) with N dc capacitor voltage measured value and capacitance voltage reference value input variable as a said N subtracter; Each said dc capacitor voltage measured value and said capacitance voltage reference value compare respectively; Obtain N output variable of N subtracter, a said N output variable is N the dc capacitor voltage margin of error;
(2) said N the dc capacitor voltage margin of error is input among the comparator I; The said dc capacitor voltage margin of error compares in comparator I in twos obtains maximum dc capacitor voltage error amount, and the H bridge of said maximum dc capacitor voltage error amount is special bridge.
The 4th optimized technical scheme provided by the invention is: STATCOM output current reference value generation unit realizes that said step C generates STATCOM output current reference value; Said STATCOM output current reference value generation unit comprises phase-locked loop, SIN function maker, cosine function maker, two multipliers and adder II;
Said step C comprises the steps:
I, be the input variable of said STATCOM output current reference value generation unit, try to achieve the phase value of said low-pressure side line voltage measurement value through said phase-locked loop with low-pressure side line voltage measurement value;
Ii, said phase value obtain corresponding sine function and cosine function value respectively after importing SIN function maker and cosine function maker respectively;
The active current reference value that iii, said sine function and steps A are tried to achieve is as the input of a multiplier; Said cosine function value and given reactive current reference value obtain two output variables as the input of another multiplier;
Iv, the output variable of step I ii is input among the adder II, the output valve of said adder II is STATCOM output current reference value.
The 5th optimized technical scheme provided by the invention is: special bridge indirect current control unit is realized the special bridge indirect current control of said step D; Said special bridge indirect current control unit comprises two integrators, multiplier II, adder III, subtracter II and PWM modulator I;
Said step D comprises the steps:
1. the maximum dc capacitor voltage error amount that obtains with step B is as the input variable of an integrator; Obtain special bridge voltage correction amplitude through integral element; Said special bridge voltage correction amplitude output variable sine function of step I i in step C is imported multiplier II, obtains the voltage correction value of special bridge;
2. STATCOM output current reference value that step C is obtained and output current measured value back another integrator of input that in subtracter II, superposes carries out integration, obtains special bridge voltage reference value;
3. the special bridge voltage reference value that 2. special bridge voltage correction value that 1. step is obtained and step obtain is input among the adder III; The signal of output is as the input variable of PWM modulator; Output pulse sequence, said pulse train is as the pulse triggering signal of device for power switching in the special bridge.
The 6th optimized technical scheme provided by the invention is: the non-special bridge Direct Current Control of said step e is realized in non-special bridge Direct Current Control unit; Said non-special bridge Direct Current Control unit comprises subtracter III, two integrators and PWM modulator II;
Said step e comprises:
After superposeing in subtracter III, STATCOM output current reference value that step C is obtained and non-special bridge output current measured value import successively in two integrators; The signal of output is as the input variable of PWM modulator II; Output pulse sequence is as the pulse triggering signal of device for power switching in all the non-special bridges except that special bridge.
The 7th optimized technical scheme provided by the invention is: said method is special bridge and non-special bridge with the H bridge dividing elements of N cascade.
A kind of more preferably technical scheme provided by the invention is: said special bridge is meant the H bridge that adopts the control of indirect current control method; Said non-special bridge is meant the H bridge that adopts the control of Direct Current Control method.
Compared with prior art, the beneficial effect that reaches of the present invention is:
1, STATCOM dc capacitor voltage balance control method provided by the invention is introduced the notion of comprehensive Current Control, and Direct Current Control and indirect current control method are combined to use, and has reduced the control difficulty, has improved the reliability of control.
2, STATCOM dc capacitor voltage balance control method provided by the invention is introduced the notion of special bridge and non-special bridge, requires to set different constraint condition according to reality and chooses special bridge.
3, STATCOM dc capacitor voltage balance control method provided by the invention adopts indirect current control and Direct Current Control respectively to special bridge and non-special bridge, guarantees that dc capacitor voltage reaches balance between each H bridge.
4, STATCOM dc capacitor voltage balance control method provided by the invention adopts comprehensive current control method, guarantees that dc capacitor voltage reaches balance between each H bridge, and has very fast response speed, and the STATCOM device performance is played optimization function.
5, STATCOM dc capacitor voltage balance control method provided by the invention adopts comprehensive Current Control, need not the additional firmware circuit, can not increase the hardware cost of STATCOM device, and has simplified the STATCOM circuit topological structure.
6, STATCOM dc capacitor voltage balance control method clear thinking provided by the invention, control are easy to realize.
Description of drawings
Fig. 1 is the flow chart of STATCOM dc capacitor voltage balance control method provided by the invention;
Fig. 2 is single-phase Cascade H bridge multi-level STATCOM topology diagram;
Fig. 3 is a H bridge unit topology diagram;
Fig. 4 is the schematic diagram of STATCOM dc capacitor voltage balance control circuit provided by the invention;
Fig. 5 is the structure chart that active current reference value of the present invention generates the link unit;
Fig. 6 is the control block diagram that active current reference value of the present invention generates link;
Fig. 7 is the structure chart of special bridge selected cell of the present invention;
Fig. 8 is that special bridge of the present invention is selected the control block diagram;
Fig. 9 is the structure chart that STATCOM output current reference value of the present invention generates the link unit;
Figure 10 is the control block diagram that STATCOM output current reference value of the present invention generates link;
Figure 11 is a special bridge indirect current control unit structure chart of the present invention;
Figure 12 is the control block diagram that employing indirect current control method of the present invention is controlled special bridge;
Figure 13 is non-special bridge Direct Current Control cellular construction figure of the present invention;
Figure 14 is the control block diagram that employing Direct Current Control method of the present invention is controlled non-special bridge;
Figure 15 is 5 H bridge cascade model dc capacitor voltage oscillograms.
Embodiment
Do further detailed description below in conjunction with the accompanying drawing specific embodiments of the invention.
STATCOM dc capacitor voltage balance control method provided by the invention is used to solve tandem type STATCOM (Static Synchronous Compensator; Abbreviation STATCOM) control problem of dc capacitor voltage balance also can be used for solving other dc-voltage balance control problems based on the power electronic equipment of cascade multi-level inverter technology.
H bridge multi-level STATCOM comprises three-phase six brachium pontis, and every is the Cascade H bridge mutually.As shown in Figure 2, Fig. 2 is single-phase Cascade H bridge multi-level STATCOM topology diagram, and every phase Cascade H bridge comprises H bridge unit, a N dc bus capacitor C of high voltage bus, low-voltage bus bar, single-phase transformer T, reactor L, resistance R s, a N cascade
1-C
NAnd correspondent voltage meter meter V
1-V
N, low-pressure side line current meter meter i
AbWith low-pressure side line voltage measurement table meter u
AB
The secondary side of single-phase transformer T, low-pressure side line voltage measurement table meter u
AB, reactor L, resistance R s, low-pressure side line current meter meter i
AbBe connected successively with the H bridge unit of N cascade; Its corresponding meter meter parallel connection in each H bridge unit.
Wherein the topological structure of each H bridge unit is as shown in Figure 3, comprises 2 couples of device for power switching P
1-P
4, 2 couples of inverse parallel diode D
1-D
4With 1 dc bus capacitor.
Fig. 4 is the schematic diagram of STATCOM dc capacitor voltage balance control circuit provided by the invention; STATCOM dc capacitor voltage balance control method provided by the invention is to adopt control circuit to realize, control circuit comprises active current reference value generation unit, generation STATCOM output current reference value generation unit, special bridge selected cell, special bridge indirect current control unit and the non-special Direct Current Control unit that connects successively.
As shown in Figure 1, Fig. 1 is the flow chart of STATCOM dc capacitor voltage balance control method provided by the invention, and STATCOM dc capacitor voltage balance control method provided by the invention comprises following implementation step:
1, generates the active current reference value.
Generating the active current reference value is realized by active current reference value generation unit.As shown in Figure 5, Fig. 5 is the structure chart that active current reference value of the present invention generates the link unit, and active current reference value generation unit comprises adder I, multiplier I, subtracter I and integrator I; Adder I, multiplier I, subtracter I and integrator I are connected successively.
In DC side meter Table V
1-V
NOutput variable u
Dc1-u
DcNBe the input variable of adder, promptly N dc capacitor voltage measured value is input, utilizes adder, multiplier, subtracter and integrator to realize.With u
Dc1-u
DcNInput summer summation obtains and is worth; With value and the constant amount 1/N input as multiplier, the gained result is the mean value of N dc capacitor voltage; This mean value again with given capacitance voltage reference value
Import subtracter together, the error amount input integral device that in subtracter, obtains carries out integration, and the gained result is the active current reference value
As shown in Figure 6, Fig. 6 is the control block diagram that active current reference value of the present invention generates link, and hypothesis has the cascade of N H bridge among the figure,
Be the dc capacitor voltage reference value,
Be N H bridge capacitance voltage mean value, u
Dcj, be j H bridge capacitance voltage value, U
mBe line voltage U
ABAmplitude,
Be active current reference value, T
f, k
u, τ
uBe the controlling unit parameter.With the N that measures H bridge dc capacitor voltage input controlling unit, try to achieve behind the mean value with reference value relatively error amount.After the controlling unit of this error amount through design, obtain the active current reference value.Obtain the active current reference value by error amount, also can realize, be not limited only to scheme shown in Fig. 6 frame of broken lines through other control strategy.
2, special bridge is selected.
Special bridge is selected to be realized by special bridge selected cell.As shown in Figure 7, Fig. 7 is the structure chart of special bridge selected cell of the present invention, and special bridge selected cell comprises N subtracter and 1 multi-input comparator, N subtracter and 1 multi-input comparator I series connection.
The active current reference value is identical with generating, with N dc capacitor voltage measured value u
Dc1-u
DcNAs the input variable of N subtracter, again to each subtracter input capacitance voltage reference value
Compare respectively, obtain N voltage error amount.This N voltage error amount is input in the multi-input comparator of next stage, compares in twos to obtain maximum voltage error amount Δ u
Dck, subscript k representes to occur the H bridge numbering of maximum voltage error, is special bridge.
As shown in Figure 8; Fig. 8 is the control block diagram according to the special bridge of the maximum principles of selected of absolute value of dc capacitor voltage and its reference value error; The present invention will adopt the H bridge of indirect current control method to be defined as special bridge; Because the H bridge quantity with this method is controlled is less relatively, non-special bridge is occupied an leading position.Among the figure,
Be dc capacitor voltage reference value, u
DcjBe j H bridge capacitance voltage value, Δ u
DcjBe j H bridge capacitance voltage value error amount.Each voltage error value is input among the maximizing link max after asking absolute value link abs, obtains Δ u
Dck, it is maximum to show that promptly k H bridge capacitance voltage departs from reference value, need carry out the capacitance voltage correction to it.The selection of special bridge; Not only can be according to the maximum principles of selected of the absolute value of dc capacitor voltage shown in Figure 8 and its reference value error, also can alternative condition be set at two maximum (or other quantity of setting) H bridges of Error Absolute Value, Error Absolute Value greater than a plurality of H bridges of the threshold value of setting, from two maximum (or other quantity of setting) H bridges of positive and negative both direction error amount etc.
3, generate STATCOM output current reference value.
Generating STATCOM output current reference value is realized by STATCOM output current reference value generation unit.As shown in Figure 9, STATCOM output current reference value generation unit comprises phase-locked loop, SIN function maker, cosine function maker, 2 multipliers and adder II; Phase-locked loop, function maker, multiplier and adder II are connected successively.
With low-pressure side line voltage measurement value u
ABBe the unique input variable of STATCOM output current reference value generation unit, try to achieve u through phase-locked loop
ABPhase value θ.θ imports SIN function maker and cosine function maker respectively, then obtains corresponding sine, cosine function value sin θ and cos θ.At this moment; The active current reference value that sin θ and step 1 are tried to achieve
is as the input of 1 multiplier; Cos θ and given reactive current reference value
are as the input of other 1 multiplier; 2 output variables that the output of two multipliers obtains are again in the input summer; The output of adder obtains and is worth, and it is exactly STATCOM output current reference value
with value
Shown in figure 10, Figure 10 is the control block diagram that STATCOM output current reference value of the present invention generates link, among the figure, and U
ABBe line voltage,
Be the active current reference value,
Be the reactive current reference value,
Be STATCOM output current reference value.Sin θ is and line voltage U
ABSynchronous sinusoidal component.
4, special bridge indirect current control.
Special bridge indirect current control is realized by special bridge indirect current control unit.Shown in figure 11, Figure 11 is a special bridge indirect current control unit structure chart of the present invention, special bridge indirect current control unit PWM modulator I, adder III, subtracter II, multiplier IV, integrator II and integrator III; Said subtracter II and integrator III connect to form subtracter II and integrator III branch road; Said multiplier IV and integrator II connect to form multiplier IV and integrator II branch road; Said adder III is connected with integrator II branch road with multiplier IV with integrator III branch road with subtracter II respectively; Said PWM modulator I is connected with adder III;
The maximum voltage error amount Δ u that obtains with step 2
DckAs the input variable of an integrator, obtain the amplitude u of k H bridge (being special bridge) voltage correction through integral element
Abk, u
AbkThe middle output variable sin θ that tries to achieve with step 3 again imports multiplier, then obtains the voltage correction value of special bridge.Simultaneously, the output current reference value and the output current measured value i that step 3 are obtained
AbInput another integrator in stack back carries out integration in subtracter II, obtains special bridge voltage reference value
With voltage reference value
Superpose in adder with the voltage correction value, the signal of output is as the input variable of PWM modulator, output pulse sequence, and said pulse train is as the pulse triggering signal of device for power switching in the special bridge.
Shown in figure 12, Figure 12 is the control block diagram that employing indirect current control method of the present invention is controlled special bridge.Adopt the indirect current control method that k H bridge (special bridge) capacitance voltage is revised.Among the figure,
Be STATCOM output current reference value, i
AbBe the output current measured value,
It is the H bridge output voltage reference value that generates by control strategy.The control strategy that generates
also can be realized through other control strategy, be not limited only to scheme shown in Figure 12 frame of broken lines.
The superposed signal of
and its correction value; As the input variable of PWM modulator, can obtain the trigger impulse of k H bridge.
5, non-special bridge Direct Current Control.
Non-special bridge Direct Current Control is realized by non-special bridge Direct Current Control unit.Shown in figure 13, Figure 13 is non-special bridge Direct Current Control cellular construction figure of the present invention, and non-special bridge Direct Current Control unit comprises subtracter, 2 integrators and PWM modulator II; Subtracter, 2 integrators are connected with PWM modulator II successively.
Because the dc capacitor voltage error amount of non-special bridge is within the acceptable range, thus need not carry out the voltage correction, and take direct current control can obtain control response speed faster.Go on foot the STATCOM output current reference value that obtains with the 3rd
With output current measured value i
AbIn adder, import successively in 2 integrators after the stack, the gained signal is finally exported set of pulses sequence as the input variable of phase-shift PWM modulator, as the start pulse signal of device for power switching in all the non-special bridges except that k H bridge.
Shown in figure 14, Figure 14 is the control block diagram that employing Direct Current Control method of the present invention is controlled non-special bridge.After selecting special bridge, other H bridge can be referred to as non-special bridge.
Be STATCOM output current reference value, i.e. the output variable of Figure 12 controlling unit, i
AbBe STATCOM output current measured value, k
p, k
iBe PI link parameter, τ
1And τ
2It is lead and lag controlling unit parameter.
With i
AbError amount through behind PI link and the lead-lag correction link, obtain command signal i
Cmdi
CmdWith one group of carrier signal with phase difference relatively after, export the trigger impulse of non-special bridge
(j=1 ..., k-1, k+1 ..., N).Also available other control strategies of controlling unit among the figure in the frame of broken lines are realized.
After adopting above-mentioned control implementation, on the example of calculation shows that is provided with the cascade of 5 H bridges, verify.Figure 15 has provided and has dropped into before and after the capacitance voltage balance control circuit that the present invention designed each H bridge capacitance voltage oscillogram.When 0.45s, drop into capacitance voltage Balance Control, wherein long lines U
DcMean value for capacitance voltage.Can find out that when not dropping into the capacitance voltage Balance Control, the capacitance voltage and the mean value of each unit differ greatly, and are example with unit I, maximum deviation can reach about 220V, and passes increase tendency in addition in time; After having added the capacitance voltage Balance Control, the capacitance voltage curves of each unit almost overlaps with mean value, and maximum deviation is no more than 5V.
STATCOM dc capacitor voltage balance control method provided by the invention has not only guaranteed the balance of dc capacitor voltage between each H bridge; Improved controlling unit response speed, optimized systematic function; Also need not the additional firmware circuit, can not increase the hardware cost of STATCOM device.
Should be noted that at last: above embodiment is only in order to technical scheme of the present invention to be described but not to its restriction; Although the present invention has been carried out detailed explanation with reference to the foregoing description; Under the those of ordinary skill in field be to be understood that: still can specific embodiments of the invention make amendment or be equal to replacement; And do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (9)
1. a tandem type STATCOM dc capacitor voltage balance control method is characterized in that, said control method comprises that Direct Current Control and indirect current control combine;
Said method comprises the steps:
A, generation active current reference value;
B, select special bridge;
C, generation STATCOM output current reference value;
D, the control of special bridge indirect current;
E, non-special bridge Direct Current Control.
2. STATCOM dc capacitor voltage balance control method as claimed in claim 1 is characterized in that said Direct Current Control comprises FEEDBACK CONTROL current waveform instantaneous value, the generation of control command electric current; Said indirect current control is meant phase place and the amplitude that produces the alternating voltage first-harmonic through control STATCOM STATCOM, controls the ac-side current of STATCOM STATCOM indirectly.
3. STATCOM dc capacitor voltage balance control method as claimed in claim 1 is characterized in that, active current reference value generation unit realizes that said steps A generates the active current reference value; Said active current reference value generation unit comprises adder I, multiplier I, subtracter I and integrator I;
Said steps A comprises the steps:
A, make the input variable of said active current reference value generation unit with N dc capacitor voltage measured value, the output variable that is about to the meter meter is input among the adder I sues for peace, and obtains and is worth;
B, said step a with value and constant amount 1/N input variable as multiplier I, the output variable of said multiplier I is the mean value of N dc capacitor voltage;
C, said mean value and dc capacitor voltage reference value are input to subtracter I, and the output variable of said subtracter I is the dc capacitor voltage error amount;
D, said dc capacitor voltage error amount are input to integrator I and carry out integration, and the result of integration gained is the active current reference value.
4. STATCOM dc capacitor voltage balance control method as claimed in claim 1 is characterized in that special bridge selected cell realizes that said step B selects special bridge; Said special bridge selected cell comprises N subtracter and comparator I;
Said step B comprises the steps:
(1) with N dc capacitor voltage measured value and capacitance voltage reference value input variable as a said N subtracter; Each said dc capacitor voltage measured value and said capacitance voltage reference value compare respectively; Obtain N output variable of N subtracter, a said N output variable is N the dc capacitor voltage margin of error;
(2) said N the dc capacitor voltage margin of error is input among the comparator I; The said dc capacitor voltage margin of error compares in comparator I in twos obtains maximum dc capacitor voltage error amount, and the H bridge of said maximum dc capacitor voltage error amount is special bridge.
5. STATCOM dc capacitor voltage balance control method as claimed in claim 1 is characterized in that, STATCOM output current reference value generation unit realizes that said step C generates STATCOM output current reference value; Said STATCOM output current reference value generation unit comprises phase-locked loop, SIN function maker, cosine function maker, two multipliers and adder II;
Said step C comprises the steps:
I, be the input variable of said STATCOM output current reference value generation unit, try to achieve the phase value of said low-pressure side line voltage measurement value through said phase-locked loop with low-pressure side line voltage measurement value;
Ii, said phase value obtain sine function and cosine function value respectively after importing SIN function maker and cosine function maker respectively;
The active current reference value that iii, said sine function and steps A are tried to achieve is as the input of a multiplier; Said cosine function value and given reactive current reference value obtain two output variables as the input of another multiplier;
Iv, the output variable of step I ii is input among the adder II, the output valve of said adder II is STATCOM output current reference value.
6. STATCOM dc capacitor voltage balance control method as claimed in claim 1 is characterized in that, special bridge indirect current control unit is realized the special bridge indirect current control of said step D; Said special bridge indirect current control unit comprises two integrators, multiplier II, adder III, subtracter II and PWM modulator I;
Said step D comprises the steps:
1. the maximum dc capacitor voltage error amount that obtains with step B is as the input variable of an integrator; Obtain special bridge voltage correction amplitude through integral element; Said special bridge voltage correction amplitude output variable sine function of step I i in step C is imported multiplier II, obtains special bridge voltage correction value;
2. another integrator carried out integration after the STATCOM output current reference value input and output current measurement value that step C is obtained superposeed in subtracter II, obtained special bridge voltage reference value;
3. the special bridge voltage reference value that 2. special bridge voltage correction value that 1. step is obtained and step obtain is input among the adder III; The signal of output is as the input variable of PWM modulator; Output pulse sequence, said pulse train is as the pulse triggering signal of device for power switching in the special bridge.
7. STATCOM dc capacitor voltage balance control method as claimed in claim 1 is characterized in that, the non-special bridge Direct Current Control of said step e is realized in non-special bridge Direct Current Control unit; Said non-special bridge Direct Current Control unit comprises subtracter III, two integrators and PWM modulator II;
Said step e comprises:
After superposeing in subtracter III, STATCOM output current reference value that step C is obtained and non-special bridge output current measured value import successively in two integrators; The signal of output is as the input variable of PWM modulator II; Output pulse sequence, said pulse train is as the pulse triggering signal of device for power switching in all the non-special bridges except that special bridge.
8. STATCOM dc capacitor voltage balance control method as claimed in claim 1 is characterized in that, said method is special bridge and non-special bridge with the H bridge dividing elements of N cascade.
9. STATCOM dc capacitor voltage balance control method as claimed in claim 8 is characterized in that, said special bridge is meant the H bridge that adopts the control of indirect current control method; Said non-special bridge is meant the H bridge that adopts the control of Direct Current Control method.
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