CN103929083B - A kind of pulse rotation control method being applicable to five level H-bridge cascade connection types STATCOM - Google Patents
A kind of pulse rotation control method being applicable to five level H-bridge cascade connection types STATCOM Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
- H02J3/1857—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters wherein such bridge converter is a multilevel converter
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/20—Active power filtering [APF]
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- Control Of Electrical Variables (AREA)
Abstract
The present invention relates to a kind of dc-voltage balance control method being applicable to five level H-bridge cascade connection types STATCOM.It is characterized in that, the method controls active power flowing between each unit by the dutycycle controlling rotation sequential on the basis of pulse period rotation, and then maintains each unit dc-voltage balance.Mainly comprising the following steps of DC voltage Balance route: the benchmark rotational cycle of pulse rotation is set；Judge the polarity of required compensating power；Calculate the departure of each unit DC voltage and its average；Departure passing ratio integration (PI) link calculated is converted into discharge and recharge time adjustment amount；Discharge and recharge time adjustment amount is converted into the change in duty cycle amount of pulse rotation sequential；Calculate the dutycycle of each unit pulse rotation sequential after revising；Level state distribution start pulse signal according to device output.Dc-voltage balance method provided by the present invention can preferably realize the Balance route of DC voltage on the premise of not affecting device top level control and the most additionally increasing switching device action frequency.
Description
Technical field
The present invention relates to H bridge cascade connection type STATCOM, particularly one and be applicable to five level H-bridge cascade connection type Static Synchronous
The pulse rotation control method of compensator.
Background technology
Since within 1976, American scholar L.Gyugyi proposition power semiconductor device carries out reactive-load compensation, STATCOM
(static synchronous compensator, STATCOM) was rapidly developed at nearest 30 years, from band coupling transformer
Multiple inverter becomes to the multi-electrical level inverter without coupling transformer, H bridge cascaded inverter with its unrivaled advantage
The study hotspot in current reactive-load compensation field.In commercial production, distribution network voltage grade is more, deposits as China's coal-mine produces in distribution
In 1140V and 3300V electric pressure, according to the level of development of current power electronic devices, five level STATCOMs are in industry
Power distribution network has certain range of application.Five level H-bridge cascade connection type STATCOM main circuit topological structures as it is shown in figure 1,
In Fig. 1, L is the filter inductance of device, udc1、udc2It is respectively the DC voltage of A facies unit 1 and unit 2.
Pulsewidth modulation (pulse width modulation, PWM) technology is the core technology of H bridge cascade connection type STATCOM, it
It is related to the harmonic characterisitic of STATCOM output voltage, the balance of DC capacitor voltage and the equilibrium of power device on-off times.
Carrier wave homophase stacking modulation (carrier disposition PWM, PD-PWM) has an outstanding line voltage harmonic elimination characteristic, but the method
There is the H-bridge unit unbalanced inherent shortcoming of power device on-off times, also result in the problem that the distribution of each unit power is uneven.
For five level, carrier wave homophase stacking modulation principle is as in figure 2 it is shown, u in Fig. 2dcFor DC voltage set-point.
H bridge cascade converter is listed by four and is compared the output level shape obtaining each H-bridge unit after ripple longitudinal direction superposition with modulating wave
State.Each unit power device on-off times is unbalanced as shown in Figure 2, and this is the inherent shortcoming of carrier wave stacking.For this problem,
The method that can use pulse period rotation makes each unit reach balance within some cycles.Now by the pulse of in Fig. 2 two unit
Once exchanging at interval of half modulating wave cycle, each H-bridge unit ideal level state is as shown in Figure 3.In Fig. 3: u1、
u2It is respectively unit 1 and unit 2 output voltage.In the most each modulating wave cycle the on-off times of two unit up to
To balance.
When carrier wave homophase stacking modulation strategy is applied to H bridge cascade connection type STATCOM, the cycle rotation of pulse can only realize gaining merit
The mean allocation of energy, when each unit is caused meritorious energy requirement inequality by parameter differences and shunt loss, mixing loss, should
Method be then difficult to the to gain merit each unit distribution according to need of energy is to balance DC capacitor voltage, and then affects the performance of device
And run.
Summary of the invention
The technical issues that need to address of the present invention are: the existing pulse period rotation used based on carrier wave homophase stacking modulation strategy
Control method can not be effectively realized dc-voltage balance, it is provided that one is not affecting device top level control and the most additionally increasing
The method preferably realizing DC voltage Balance route on the premise of adding switch device activity number of times.
For solving the problems referred to above, the technical solution used in the present invention is: one is applicable to five level H-bridge cascade connection types STATCOM
The pulse rotation control method improved, the method is controlled by the dutycycle controlling rotation sequential on the basis of pulse period rotation
The active power processed flowing between each unit, and then maintain each unit dc-voltage balance.It is characterized in that, the step of the method
Rapid as follows:
Step (1) arranges the benchmark rotational cycle of pulse rotation.
Step (2) judges the polarity of compensating power according to the phase relation of surveyed voltage, electric current.
Step (3) computing unit 1 DC voltage and the departure of unit DC voltage meansigma methods.Use voltage sensor senses
Each unit DC voltage in each sampling period, asks for unit DC voltage according to the data that sensor is gathered by DSP
Meansigma methods, the unit DC voltage meansigma methods that calculates of order and unit 1 DC voltage measured value are made difference and i.e. be can get unit
1 DC voltage and the departure of unit DC voltage meansigma methods.
Step (4) according to step 2 judge the voltage deviation amount that the polarity of reactive power and step 3 calculate calculate revise after each list
The dutycycle of unit's pulse rotation sequential.
The level state distribution start pulse signal that step (5) exports according to device, according to revised pulse rotation sequential to triggering
Pulse signal carries out rotation and drives each unit switching device to perform corresponding actions.
Choose in described step 1 that benchmark rotational cycle is the modulating wave cycle 1/2, the reference duty cycle of the most each rotational cycleNote unit 1 is respectively g with unit 2 pulse rotation sequential1With g2。
If compensating power is perception in step 2, remember Q > 0, sign=1；If compensating power is capacitive, remember Q < 0,
Sign=-1, wherein sign is the sign function of reactive power.
According to two unit DC voltage u measured by voltage sensor in step 3dc1、udc2, unit DC side can be calculated
Average voltageThen voltage deviation amount is:
Step 4 calculates the dutycycle of rotation sequential after revising and comprises following step:
The first step, it is judged that in each rotational cycle, each unit DC bus capacitor needs charge status, corresponding relation is as shown in table 1.
Table 1. each unit DC bus capacitor discharge and recharge judges
| Δ u ＞ 0 | Δ u ＜ 0 | |
| Unit 1 | Charging | Electric discharge |
| Unit 2 | Electric discharge | Charging |
Second step, is converted into pulse rotation sequential correction amount t by departure Δ u passing ratio integration (PI) link calculated.
3rd step, it is stipulated that DC bus capacitor discharge and recharge respective pulses rotation timing variations rule.As a example by unit 1, unit 1 is straight
Stream lateral capacitance discharge and recharge and pulse rotation sequential g1Corresponding relation is as shown in table 2.
Table 2. unit 1 DC bus capacitor discharge and recharge and pulse sequence corresponding relation
| g1 | Charging | Electric discharge |
| Q>0 | Move to right trailing edge (moving to left trailing edge) | Move to right rising edge (moving to left rising edge) |
| Q<0 | Move to right rising edge (moving to left rising edge) | Move to right trailing edge (moving to left trailing edge) |
Corresponding rotation sequential g of unit 22With g1Complementation, existing regulation is unified takes the mode of moving to right to control capacitor charge and discharge, then move to right trailing edge
g1The dutycycle of pulse rotation sequential increases, and moves to right rising edge dutycycle and reduces.
4th step, note g1 change in duty cycle amount is Δ Don, pulse rotation sequential correction amount t is converted into pulse duty factor change
Amount Δ Don。ΔDonComputing formula is:
ΔDon=K sign Δ t
In formula, K is the transformation ratio of discharge and recharge time adjustment amount and pulse rotation sequential dutycycle,Sign is reactive power pole
The sign function of property, Δ t is discharge and recharge time adjustment amount.
5th step, calculates dutycycle D of unit 1 pulse rotation sequential after revisingon.The change in duty cycle calculated by step 5
Amount Δ DonWith reference duty cycleIt is added, gets final product dutycycle D of rotation sequential after computing unit 1 is revisedon, and then obtain unit
1 revised rotation sequential, unit 2 pulse rotation sequential is complementary with unit 1.
In step 5, device output level state is as shown in table 3 with start pulse signal corresponding relation.
Table 3. device output level state and start pulse signal corresponding relation
| Unit 1 | Unit 2 | |
| Output level state | [s1s2s3s4] | [s1s2s3s4] |
| 1 | [1001] | [1100] |
| 2 | [1001] | [1001] |
| 0 | [1100] | [1100] |
| -1 | [0110] | [0011] |
| -2 | [0110] | [0110] |
Wherein s1, s2, s3, s4 are the triggering pulse of each power device, and concrete corresponding relation is as shown in Figure 1.
Beneficial effect
Compared with prior art, the dc-voltage balance control method that the present invention provides has the advantage that
Pulse rotation control method the most provided by the present invention is taken into account carrier wave homophase stacking and is modulated outstanding line voltage harmonic elimination characteristic and power
The advantage of devices switch number of times equilibrium assignment；
2. the method preferably realizes the balance control of DC voltage on the premise of the most additionally increasing power device on-off times；
3. the method has wider power adjustment, can be applied to the commutator of H bridge cascade structure.
Accompanying drawing explanation
Accompanying drawing 1 is five level H-bridge cascade connection type STATCOM main circuit topological structure figures.
Accompanying drawing 2 is carrier wave homophase stacking principle schematic.
Accompanying drawing 3 is carrier cycle rotation waveform diagram.
Accompanying drawing 4 is the pulse rotation policy control schematic diagram improved.
Accompanying drawing 5 is each unit DC bus capacitor charge-discharge region schematic diagram.
Accompanying drawing 6 is pulse period rotation DC voltage oscillogram.
Accompanying drawing 7 is the pulse rotation DC voltage oscillogram improved.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail.
The invention provides a kind of pulse rotation DC voltage control side being applicable to five level H-bridge cascade connection types STATCOM
Method, its control principle block diagram as shown in Figure 4, implements step as follows:
Step (1) arranges the benchmark rotational cycle of pulse, and rotational cycle is:
In formula, T is the modulating wave cycle, and k is any positive integer, the reference duty cycle of the most each rotational cycleDue to arteries and veins
Rushing rotational cycle the shortest, it is the best that each unit DC voltage adjusts real-time, the most generally takes k=1.Two unit direct currents
Lateral capacitance charge-discharge region and rotation sequential are as shown in Figure 5.In Fig. 5, flag1、flag2It is respectively unit 1 and unit 2 electric capacity
Discharge and recharge mark, g1、g2Being respectively unit 1 and unit 2 level state rotation sequential, this sequential is Tong Bu with modulating wave, t1、t2
It is respectively g1Trailing edge and rising edge.
Step (2) judges the polarity of compensating power.Phase relation according to surveyed voltage, electric current i.e. can determine whether reactive power
Polarity, when the reactive power of required compensation is perception, remembers reactive power Q > 0, sign=1；When reactive power is capacitive,
Note Q < 0, sign=-1.
Step (3) computing unit 1 DC voltage and the departure of unit DC voltage meansigma methods.Employing voltage sensor is respectively
Detector unit 1 and instantaneous value u of unit 2 DC voltagedc1With udc2, the data according to being gathered calculate unit by DSP
DC voltage meansigma methodsThen unit 1 DC voltage with the departure of unit DC voltage meansigma methods is:
Voltage deviation amount Δ u passing ratio integration (PI) link is converted into discharge and recharge time adjustment amount Δ t by step (4).
Discharge and recharge time adjustment amount Δ t is converted into pulse rotation sequential g by step (5)1Change in duty cycle amount Δ Don。ΔDonCalculate
Formula is:
ΔDon=K sign Δ t
In formula, K is the transformation ratio of discharge and recharge time adjustment amount and pulse rotation sequential dutycycle,Sign is reactive power pole
The sign function of property, Δ t is discharge and recharge time adjustment amount.
Step (6) calculates dutycycle D of the pulse rotation sequential of unit 1 after revisingon.The dutycycle calculated by step (5) becomes
Change amount Δ DonWith reference duty cycleDo additive operation, dutycycle D after correction can be calculatedonFor:
Unit 2 pulse rotation sequential is complementary with unit 1.
The level state distribution start pulse signal that step (7) exports according to device, according to revised pulse rotation sequential to triggering
Pulse signal carries out rotation and drives each unit switching device to perform corresponding actions, device output level state and the tool triggering pulse
Body corresponding relation is as shown in table 3.
Fig. 6, for using pulse period rotation control strategy DC capacitor voltage oscillogram, joins due to each components and parts in actual condition
The existence that the difference of number and shunt loss are lost with mixed type, DC capacitor voltage just can not maintain balance, also can affect defeated
Go out the waveform quality of voltage, electric current.
Fig. 7 is to use the pulse rotation control strategy DC capacitor voltage oscillogram improved, and two DC capacitor voltages all can
Realize balance well, control respond well.
Claims (4)
1. it is applicable to a pulse rotation control method for five level H-bridge cascade connection types STATCOM, H bridge cascade connection type STATCOM
AC accesses between electrical network and load by reactor parallel connection, it is characterised in that: the method is at the base of pulse period rotation
By adjusting the Duty ratio control active power flowing between each unit of rotation sequential on plinth, reach to maintain each unit DC side electricity
The purpose of pressure balanced, comprises the steps of
Step (1) arranges the benchmark rotational cycle of pulse rotation；Rotational cycle is:
In formula, T is the modulating wave cycle, and k is any positive integer, the reference duty cycle of each rotational cycleNote unit 1
It is respectively g with unit 2 pulse rotation sequential1With g2；
Step (2) judges the polarity of compensating power according to the phase relation of surveyed voltage, electric current；When reactive power is for holding
Property time, remember Q ＜ 0, sign=-1；Sign is the sign function of reactive power polarity, when the reactive power of required compensation is perception,
Note reactive power Q ＞ 0, sign=1；
Step (3) computing unit 1 DC voltage and the departure of unit DC voltage meansigma methods: use voltage sensor
Detect cascade each unit DC voltage in each sampling period, based on DSP computing unit DC voltage meansigma methods, this is put down
Average compares the deviation of acquiring unit 1 DC voltage and unit DC voltage meansigma methods with unit 1 DC voltage measured value
Amount；Described unit 1 DC voltage with deviation delta u of unit DC voltage meansigma methods is:
The voltage deviation amount correction each unit that the reactive power polarity that step (4) is judged according to step 2 and step 3 calculate
The dutycycle of pulse rotation sequential；
Step (5) is according to the level state distribution start pulse signal of output, according to revised pulse rotation sequential to triggering arteries and veins
Rush signal carry out rotation and drive each unit switching device to perform corresponding actions.
The pulse rotation control method of H bridge cascade connection type STATCOM the most according to claim 1, it is characterised in that: institute
The step 4 stated calculates the dutycycle of rotation sequential after revising and comprises following step:
The first step, it is judged that in each rotational cycle, each DC bus capacitor needs charge status, shown in corresponding relation following table:
Second step, is converted into discharge and recharge time adjustment amount Δ t by departure Δ u passing ratio integration (PI) link calculated；
3rd step, it is stipulated that DC bus capacitor discharge and recharge respective pulses rotation timing variations rule, as a example by unit 1, unit 1 is straight
Stream lateral capacitance discharge and recharge and pulse rotation sequential g1Shown in corresponding relation following table；
Corresponding rotation sequential g of unit 22With g1Complementation, then move to right trailing edge g1The dutycycle of pulse rotation sequential increases, and moves to right rising
Reduce along dutycycle；
4th step, remembers g1Change in duty cycle amount is Δ Don, discharge and recharge time adjustment amount Δ t is converted into pulse duty factor variable quantity
ΔDon
ΔDon=K sign Δ t
In formula, K is the transformation ratio of discharge and recharge time adjustment amount and pulse rotation sequential dutycycle,
5th step, calculates dutycycle D of unit 1 pulse rotation sequential after revisingon, four-step calculation the change in duty cycle that goes out
Amount Δ DonWith reference duty cycleIt is added, gets final product dutycycle D of rotation sequential after computing unit 1 is revisedon, and then obtain unit
1 revised rotation sequential, unit 2 pulse rotation sequential is complementary with unit 1.
The pulse rotation control method of H bridge cascade connection type STATCOM the most according to claim 1, it is characterised in that: institute
In the step 5 stated shown in device output level state and start pulse signal corresponding relation following table:
Wherein s1, s2, s3, s4 are the triggering pulse that each power device is corresponding.
The pulse rotation control method of H bridge cascade connection type STATCOM the most according to claim 1, it is characterised in that: take
K=1.
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| CN107302300B (en) * | 2017-06-15 | 2019-02-22 | 温州大学 | A kind of parallel system Balance route departure acquisition circuit based on PWM filtering |
| CN108879715B (en) * | 2018-07-05 | 2021-03-30 | 中国矿业大学 | Voltage control method based on cascade U-Cell topology static synchronous compensator |
| CN113391124B (en) * | 2021-06-03 | 2023-09-29 | 珠海万力达电气自动化有限公司 | Insulation level monitoring method, device and system for medium-voltage power system |
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| US4941079A (en) * | 1988-10-07 | 1990-07-10 | The Royal Institution For The Advancement Of Learning | Pulse width modulation power transmission system |
| CN101951162A (en) * | 2010-09-06 | 2011-01-19 | 东北电力大学 | Pulse width control method of modular multilevel converter |
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| CN103199550A (en) * | 2013-04-26 | 2013-07-10 | 哈尔滨工业大学 | Capacitor voltage balance control method of cascade reactive power compensation device |
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2014
- 2014-04-17 CN CN201410156246.8A patent/CN103929083B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4941079A (en) * | 1988-10-07 | 1990-07-10 | The Royal Institution For The Advancement Of Learning | Pulse width modulation power transmission system |
| CN101951162A (en) * | 2010-09-06 | 2011-01-19 | 东北电力大学 | Pulse width control method of modular multilevel converter |
| CN102340259A (en) * | 2011-09-21 | 2012-02-01 | 山东大学 | Novel instantaneous-current-direct-control-based pulse width modulation current tracking control method |
| CN103199550A (en) * | 2013-04-26 | 2013-07-10 | 哈尔滨工业大学 | Capacitor voltage balance control method of cascade reactive power compensation device |
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