CN102780227A - Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor - Google Patents
Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor Download PDFInfo
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Abstract
The invention discloses a chained static compensator (STATCOM) direct-current-side voltage controlling method and a chained STATCOM direct-current-side voltage controlling circuit based on a voltage-sharing capacitor. The chained STATCOM direct-current-side voltage controlling circuit comprises a three-phase star-shaped connection inverter, the voltage-sharing capacitor, n bidirectional switch devices, a sensor and a microprocessor, wherein output voltage of each inversion circuit module of the three-phase inverter is detected by the sensor and is output to the microprocessor; the microprocessor is used for controlling connection/disconnection of the n bidirectional switch devices until direct-current-side capacitor voltage of each phase is balanced. By adding a small-volume auxiliary circuit, energy of each current-side capacitor of a chained STATCOM is renewedly distributed, so that the capacitor voltage keeps stable and balanced, and the key problem that the STATCOM is limited to be used in a high-pressure large-volume occasion is effectively and reliably solved; and therefore, the reliability of a system is greatly improved, and the cost of voltage-sharing control is obviously reduced so as to propel that the chained STATCOM is reliably applied to medium-high pressure high-volume power devices.
Description
Technical field:
The invention belongs to the power quality controlling research field, particularly the DC side voltage control method of the chain type STATCOM of mesohigh and control circuit.
Background technology:
Chain type STATCOM has significant advantages such as level quantity is many, harmonic content is little, passive device is little, scalability is good; In electrical power trans mission/distribution system, bringing into play compensating reactive power; Improve the stability of system voltage; The important function such as runnability of improvement system; Being the effective means that solves high-voltage large-capacity field power quality problem, is flexible AC transmitting system (Flexible AC Transmission System, one of core technology FACTS).
The premium properties of chain type STATCOM and existing systems control strategy all are based upon each power model to have on the perfect conforming basis, and this just requires each power model must have consistent dc voltage.But in the real system; Because the otherness of the parasitic parameter of switching device, operating state etc.; The active power that the different capacity module need absorb or send can be different; The dc voltage that therefore part of module will occur falls comparatively fast, and the reduction of the dc voltage of a part of module is slower in addition, i.e. the dc voltage energy imbalance.Therefore, must plus outer control ensure that dc voltage is stable and do not fall that and dc voltage remains equal.
The unbalanced reason of dc voltage is concluded and is mainly contained two aspects: the one, and the inconsistency of module parameter; The 2nd, the inconsistency of power cell operating state, these two kinds of reasons have caused the quantity of power cell consumed energy and power consumption inconsistent.Existing DC voltage control strategy also can be divided into two big types: the first kind is a hardware approach, and basic thought is the energy that comes the supply dc bus capacitor to consume through hardware circuit.Being seen in reported method has: paraller resistanc method, ac bus energy exchange method, dc bus energy exchange method etc.; The hardware circuit that these class methods are used mainly contains: the combination of PWM rectification circuit, diode rectifier bridge, inverter and isolating transformer; Difference between the distinct methods is mainly reflected in the path of circuit topology, energy source and energy Flow; Wherein classic methods is to use the phase shift multi winding transformer to add the diode rectifier scheme, and it is the main stream approach of present dc capacitor voltage control.Hardware approach is all pressed, the effect of voltage stabilizing is fine, but cost is high, volume is big, efficient is low and be not easy to expansion.The difficult design of part hardware, produce inconvenience, control is complicated, but also can cause the power factor step-down of device.
Second type is software approach, adopts closed-loop control thought, and the dc voltage of power model is measured, and carries out the PI adjusting according to the deviation of voltage or power, thereby obtains the drive signal of power model.This method is less to the dependence of hardware, only needs sensor voltage, current signal, and cost is low, volume is little.But pi regulator design, debugging complicacy.Along with the increase of power model quantity, the PI control ring increases thereupon, makes the PI parameter designing that usually need rely on commissioning experience to accomplish to accomplish.And the coupling complexity between each control ring also sharply increases with the increase of module number, the system debug difficulty, and reliability is very poor, has limited the expansion of system.Therefore, the application in actual device also seldom.
In addition, the essence of software approach is to have regulated the pulse duration or the phase angle of each power model, has just changed the output pulse signal of CPS-SPWM modulator approach.Change pulse duration or phase angle and make the CMI output voltage waveforms become asymmetric, introduced more harmonic wave; A lot of when the power model number, when inconsistency difference is big more, the harmonic frequency that this method is introduced can be low more, the adjustable range of phase angle is also more little, therefore applicable scope is very limited.
The present invention has combined advantages such as the hardware approach effect is excellent, software approach is with low cost, adopts the chain type STATCOM DC voltage control strategy of equalizing capacitance and the compound use of hierarchical control thought.This scheme only need be added the auxiliary circuit of low capacity; Cooperate simple control program can realize the stable, balanced of each dc capacitor voltage, saved a large amount of high Precision Detection elements, and need not the voltage close loop control of complicacy, fragility; Thereby control program and design of Regulator have been simplified; Improve the reliability and the easy implementation of system greatly, reduced the cost of electric voltage equalization control significantly, thereby impelled chain type STATCOM to be applied to mesohigh large-capacity power equipment reliably.
Below provide the pertinent literature of retrieval:
[1] Liu Wenhua, Song Qiang, Teng Letian. based on the dc-voltage balance control [J] of the 50MVA STATCOM of chain inverter. Proceedings of the CSEE .2004,24 (4): 145-150.
[2] Wei Wenhui. chain type is ended the main circuit of synchronous compensator and the research of Dynamic Control Strategy [D]. Tsing-Hua University's doctorate paper, 2004.
[3] permitted to win. based on the research [D] of the big capacity DSTATCOM of four-quadrant dual H-bridge current transformer cascade type key technology. Southeast China University's doctorate paper, 2009.
[4] wear jade-like stone, Chen Jingjing, palace power. adopt the cascade connection type DSTATCOM decentralized control strategy [J] of many DSP. high voltage technique .2010,36 (11): 2821-2826.
[5] Qiu Yanhui. the research of multiple-level serially connected electric energy quality controller DC side voltage control method. [D] Xi'an Communications University master thesis, 2010.
[6] Liu Zhao, Liu Bangyin, Duan Shanxu. the dc capacitor voltage Balance Control [J] of chain static synchronous compensator. Proceedings of the CSEE .2009,29 (30): 7-12.
[7]Chen?Junling,Yin?Zhizhu,Wang?Ping?et?al.Capacitor?voltage?balancing?control?of?cascaded?multilevel?inverter?for?high-power?active?power?filters[C].Proceedings?of?the?2008?IEEE?DRPT,2008:1683-1687.
[8]Fujii?K,De?Doncker?R?W.A?Novel?DC-link?Voltage?Control?of?PWM-Switched?Cascade?Cell?Multi-Level?Inverter?Applied?to?STATCOM[C].Proceedings?of?the?2005IEEE?IAS,2005.961-967.
[9]Yanhui?Qiu,Yingjie?He,Ji?njun?Liu,Fang?Zhuo.A?DC?Voltage?Control?Method?of?Cascaded?H-bridge?Inverter?for?Power?Quality?Conditioner[C].ISIE?2010,Bari.
[10]Yingjie?He,Yanhui?Qiu,Jinjun?Liu,Fang?Zhuo.A?Comprenhensive?Study?of?Voltage?Balancing?Problem?of?Cascaded?H-bridge?Inverter?for?Power?Quality?Conditioner[C].Proc.of?IEEE?IPEC2010.
Summary of the invention:
The object of the present invention is to provide a kind of chain type STATCOM dc capacitor voltage control strategy based on equalizing capacitance and the compound use of hierarchical control thought.This scheme only need be added the auxiliary circuit of low capacity; Cooperate simple control program can realize the stable, balanced of each dc capacitor voltage; Thereby save complicated voltage close loop control fully, significantly reduce the hardware cost of Pressure and Control, control each power model dc capacitor voltage of chain type STATCOM reliably; Make it stable, balanced, guarantee system under the high-voltage large-capacity power utilization environment efficiently, work reliably.
Set forth from topology design and control realization two aspects below:
1) topology design:
Three-phase chain structure inverter joins through three inlet wire inductance and three phase network; Each is made up of inverter n 2H bridge inverter circuit module series connection that has the independent direct current lateral capacitance, and module number n confirms according to the line voltage grade, generally gets n＞e
m/ u
Dc, e wherein
mBe line voltage amplitude, u
DcDc capacitor voltage desired value for each power model;
Whenever, use 1 equalizing capacitance mutually, size is close with the dc bus capacitor of power model, is used on the DC side of each power model, moving unbalanced energy, makes the dc capacitor voltage of each module reach poised state;
3 * 2 * n bidirectional switch device is used for independently 2H bridge inverter circuit module dc bus capacitor of control connection equalizing capacitance and each.
2) control realizes:
A) the threephase load electric current through the current sensor senses target compensation;
B) in control circuit board, the load current that detects is carried out the instantaneous reactive conversion, needing to obtain each phase current composition of compensation---idle, harmonic wave, imbalance etc.;
C) save the phase information that computing obtains three phase network voltage through phase-locked loop; And itself and predetermined amplitude multiplied each other obtain the fundamental active current composition, promptly overall active power control algolithm (this preset amplitude information is decided to be chain type STATCOM system balance capacity 1% ~ 3% corresponding fundamental active current amplitude);
D) with above b) and the electric current composition that c) obtains superimposed as final control command, control three-phase inverter output current; Concrete implementation method is to detect the three-phase inverter output current; And it and corresponding each control command are mutually done poor; And the modulator approach through utilizing the phase shift carrier wave after the PI adjusting produces corresponding C PS-SPWM signal, in order to drive the switching tube IGBT of each power model.
The traversal method perhaps is worth most the drive signal that comparison method generates the bidirectional switch device during e) through grade; To connect the electric capacity of equalizing capacitance and power model by turns; Unbalanced energy is redistributed, until the capacitance voltage balance between the dc bus capacitor of each power model.
The invention has the beneficial effects as follows:
The present invention passes through the auxiliary circuit of additional low capacity, and through simple program control, just can realize the energy of each dc bus capacitor of chain type STATCOM is redistributed; Make its capacitance voltage keep stable and balanced; Effectively and reliably solved and limited the key issue that this structure STATCOM uses in the high-voltage large-capacity occasion, and saved a large amount of high Precision Detection elements, and the control of complicated, fragile voltage close loop; Thereby control program and design of Regulator have been simplified; Improve the reliability of system greatly, reduced the cost of Pressure and Control significantly, thereby impelled chain type STATCOM to be applied to mesohigh large-capacity power equipment reliably.In addition,, this controlling schemes has been carried out simulating, verifying, confirmed the validity and the reliability of this scheme through building the chain type STATCOM simulation model of five level.Only built the cascaded structure of 2 modules in the emulation, but this method can extend to the series connection of operational blocks which partition system in the real system, thus with this system applies in more high-tension power utilization environment, therefore have application of practical project and be worth.
Description of drawings:
The structural representation of Fig. 1 chain type STATCOM.
The systematic control algorithm block diagram of Fig. 2 chain type STATCOM.
The overall active power control algolithm of Fig. 3 block diagram.
Fig. 4 capacitor voltage equalizing sketch map.
The equalizer circuit figure of the system that Fig. 5 is made up of N power model.
Energy Flow sketch map during Fig. 6 employing etc. during the traversal method.
Bidirectional switch drive waveforms during Fig. 7 employing etc. during the traversal method.
The CMI circuit diagram that Fig. 8 emulation is used (phase).
Dc voltage waveform when Fig. 9 does not have DC voltage control.
Figure 10 (a) applies the control of overall active power and the Equivalent DC side voltage waveform of CMI during the balanced control of no-voltage.
Figure 10 (b) applies the control of overall active power and the dc voltage waveform of each power model during the balanced control of no-voltage.
Figure 11 (a) adopts the dc voltage waveform of each power model when traveling through method when waiting.
Figure 11 (b) adopts the drive signal waveform of the bidirectional switch pipe when traveling through method when waiting.
Figure 12 (a) adopts the dc voltage waveform of each power model when being worth comparison method most.
Figure 12 (b) adopts the drive signal waveform of the bidirectional switch pipe when being worth comparison method most.
The compensation effect of Figure 13 five level chain type STATCOM.
Embodiment:
Below in conjunction with accompanying drawing the present invention is done detailed description.
The structure of chain type STATCOM is as shown in Figure 1, by electrical network, reactive load, connection inductance and chain type multi-electrical level inverter (Cascaded Multilevel Inverter, formation such as CMI).CMI is composed in series by N power model.The present invention describes with the Y-connection structure, and the control method that triangle connects can be analogized, every phase CMI be parallel to after through the inductance that is connected in series system points of common connection (Point of Common Coupling, PCC).The power model that constitutes CMI is a complete single-phase inverter; Comprise independently power switch pipe, DC side power supply, drive circuit, testing circuit, protection and control circuit etc.; It can be a diode-clamped circuit; Perhaps the capacitor type clamp circuit also can be a 3H bridge inverter circuit etc.Power model shown in Fig. 1 is single-phase 2H bridge inverter, is present the most frequently used a kind of power model.
The present widely used modulation strategy of chain type STATCOM is carrier phase sinusoidal pulse width modulation technology CPS-SPWM (Carrier Phase-Shifted SPWM).Widely used system control strategy is for feedforward decoupling zero control algolithm, and is as shown in Figure 2.Referenced reactive current i
LqThrough load current sampling and idle detection algorithm are obtained; Active current instruction i
LdThrough detection of power model dc voltage and active current control algolithm are obtained; Detect voltage on line side, device output current, and it is carried out coordinate transform obtain the feed-forward voltage u under the synchronous rotating frame
Sd, u
SqAnd feedback current i
Cd, i
Cq, above-mentioned physical quantity promptly gets the command voltage u of auto levelizer through the decoupling zero control algolithm
Cd, u
Cq, command voltage obtains final modulation signal through the park inverse transformation, compares with the phase shift triangular carrier and has just obtained final drive signal.
The thinking that patent disclosed method of the present invention has adopted hierarchical control thought to combine with equalizing capacitance; Be divided into two levels generally: ground floor is through the total active power of software approach control device, and the second layer is realized the electric voltage equalization between the power model through equalizing capacitance.Second layer control has utilized the most basic principle of circuitry: the electric capacity that two voltage does not wait is through after the resistance series connection, and energy is can nature mobile so that both voltage is equal fully, and is the mean value of the two.Soft, hardware approach advantage separately that the method has combined, the shortcoming of having avoided both is a kind of reliable, effective practical methods.
1, overall active power control
Actual chain type STATCOM is not to be desirable reacance generator.In the course of the work; Because actions such as the cut-offfing of switching tube, conducting are to need consumption active power; Therefore, if do not add control, the dc voltage of power model will little by little reduce; The speed that reduces depends on the size of the active power that power model consumes, and the decrease that is to say dc voltage has reflected the active power of module needs.Therefore, the needed total active power positive correlation of summation and system of the dc voltage of each module reduction.Promptly obtain overall active power (fundamental positive sequence active power) control algolithm by negative feedback thought, as shown in Figure 3.U among the figure
RefRepresentation module dc voltage set-point; u
Dc_ai, u
Dc_bi, u
Dc_ciRepresent respectively actual detected to A, B, C three-phase in the dc voltage value of i module.Utilize the method in time to inject the active power that required active power just can remedy the loss of system works institute to power model.
Because the inconsistency of module, the dc voltage rate of descent of disparate modules is also inconsistent; In like manner every mutually required active power also maybe be inconsistent.At this moment, the control of active power should comprise two levels: the alternate Balance Control of overall active power control and active power.The emphasis of this patent is the electric voltage equalization control strategy between the module, supposes that therefore the situation of each phase is consistent, so do not consider alternate equilibrium control.
2, the control of the electric voltage equalization between the module
Total active power enough the time, be exactly remaining work makes unbalanced energy reasonable distribution between each module.If do not adopt the electric voltage equalization control algolithm, the module that can have is overcharged, and the module overdischarge that has finally causes the voltage between the module seriously unbalanced, finally causes system's cisco unity malfunction.As shown in Figure 4, if capacitor C
iVoltage u
Dc_iSurpass set point u
Ref, then must have the voltage of some or certain several power model to be lower than set point.Because total active power is confirmed, is unreasonable distribution.Suppose C among Fig. 4
jVoltage be lower than preset value u
Ref, C
iVoltage surpass preset value u
RefThe method that this patent proposes adopts equalizing capacitance C exactly
b" carrying " unbalanced energy between a plurality of electric capacity makes the voltage of each module finally reach balanced.Concrete step is:
Though this method is to tell about to the electric voltage equalization of two modules, can analogize the system that forms to a plurality of module series connection.The system of N module series connection formation is as shown in Figure 5, wherein switching tube S
iWith
Be a switch combination, control being connected between i module and the equalizing capacitance, both are indispensable, must occur simultaneously.Reason has 2 points: the one, constitute equal hydraulic circuit; The 2nd, realize the de between the power model.Switching tube S
iWith
Switching logic remain unanimity: during logical one, equalizing capacitance and module i connect, and carry out energy transfer with balanced; During logical zero, break off fully between equalizing capacitance and the module i.According to the difference of switching tube drive signal generation method, concrete control strategy can be divided into two kinds again: travel through method when waiting, be worth comparison method most.
2.1 Deng time traversal method
Basic thought Deng time traversal method is: equalizing capacitance puts in order according to power cell, is connected with the dc bus capacitor of each module respectively, promptly travels through; And identical with the time that each power model connects, make the equiprobability of each power model and equalizing capacitance positive energy exchange, when promptly waiting.As long as parameter designing is proper, according to said method repeat just to realize the electric voltage equalization between each module, as shown in Figure 6.The drive waveforms of bidirectional switch pipe can be when waiting, travel through these two principles confirms that as shown in Figure 7, the duty ratio of the drive signal of bidirectional switch pipe is: 1/N, the phase difference between the drive signal of adjacent power module are 2 π/N.
2.2 be worth comparison method most
The basic thought that is worth most comparison method is: detect each power model i (i=1,2 ..., magnitude of voltage N) is therefrom selected voltage the maximum C
iWith voltage reckling C
j, then with equalizing capacitance C
bWith C
iBe connected, make C
iPart in the excess energy is transferred to equalizing capacitance C earlier
bIn, method is to open S
i,
Next with equalizing capacitance C
bWith C
jBe connected, make equalizing capacitance C
bTo C
jCharging makes C
jVoltage raises, and method is to open S
j,
Repeat above-mentioned steps successively,, just can realize the electric voltage equalization between each module as long as parameter designing is proper.Concrete implementation process is carried out according to following steps:
Step 1: maximum voltage side-play amount ε and command voltage u that permission is set
Ref
Step 2: the dc voltage u that measures each power model
Dc_i(i=1,2 ..., N);
Step 3: seek maximum voltage value u
Dc_iWith minimum voltage value u
Dc_j
Step 4: calculating voltage offset u
1=u
Max-u
Ref, Δ u
2=u
Ref-u
Min
Step 5: judge whether voltage deviation meets the demands, i.e. Δ u
1≤ε and Δ u
2Whether≤ε sets up.Then directly jump to step 2 if set up, otherwise continue to carry out downwards;
Step 6: open S
i,
Turn-off S
k,
Promptly
Step 7: open S
j,
Turn-off S
k,
Promptly
Step 8: forward step 2 to, repeat above-mentioned steps.
2.3 the contrast of two kinds of implementation methods
Simple Deng time traversal method; Need not to detect all dc capacitor voltages; Need not complicated calculating and logic determines, the frequency of the drive signal of bidirectional switch, duty ratio and phase place are all very fixing, and all press the overall control algolithm of algorithm and system relatively independent; Do not influence each other, implement relatively easy; But in this method, each electric capacity is identical by the time of equilibrium, and chance is identical, and is without regard to the relative importance or urgency, connects in turn.Therefore, when module became many, the time that each module is waited for was longer, certain module may occur and not need equilibrium, and the time that perhaps need connect is very short just can to meet the demands, and other module possibly also not reach equilibrium and just broken off with equalizing capacitance.Module number is many more, and effect is poor more, even can not meet the demands, and the cost of perhaps paying is very big.
The remarkable advantage that is worth most comparison method is an inconsistency of having considered module, pays the utmost attention to the most serious module of skew, does not consider that side-play amount has satisfied the module of ripple requirement, and therefore balanced speed is very fast.Therefore the cost of paying is the more calculating and the logic determines of more complicated, makes control system become complicated, and the drive signal waveform of bidirectional switch pipe is irregular.
Obviously, when the power model number greater than 2 the time, the switching tube open and close times that is worth comparison method most is less relatively, balancing speed is the fastest, and is most effective, number of modules is many more, advantage is obvious more.Consider the complexity that is worth comparison method most, suggestion when number of modules greater than 5 the time, preferentially employing is worth comparison method most.
Provided a kind of chain type STATCOM DC side voltage control method among the present invention based on equalizing capacitance.And utilize the simulink among the MATLAB that this control method has been carried out simulating, verifying.In the simulation model, the CMI circuit topology of star chain type STATCOM is as shown in Figure 8.Fig. 9 emulation do not add the influence that DC voltage control can cause, Figure 10 emulation the effect when having only overall active power control, Figure 11 and Figure 12 respectively emulation etc. the time travel through method and be worth the control effect of comparison method most.Simulation result shows: realized the stable and balanced of chain type STATCOM dc voltage based on the control method of equalizing capacitance, can the long-time safety of safeguards system, stable, work efficiently.Can substitute the traditional hardware pressure equalizing control method fully and the control effect is constant, thereby the purpose of realize practicing thrift cost, raising the efficiency has the important project practice significance.
Claims (8)
1. based on the chain type STATCOM DC side voltage control method of equalizing capacitance, it is characterized in that, comprise the steps:
1) topology design:
Three-phase Y-connection inverter joins through three inlet wire inductance and three phase network; Each is made up of inverter n 2H bridge inverter circuit module series connection that has the independent direct current lateral capacitance; Whenever, use 1 equalizing capacitance mutually, its two ends are connected through the dc bus capacitor two ends of bidirectional switch device with n said inverter circuit module respectively, through the control of bidirectional switch device its with the conducting and the shutoff of the individual said dc bus capacitor of n;
2) control realizes:
A) the threephase load electric current through the current sensor senses target compensation;
B) load current that detects is carried out the instantaneous reactive conversion, needing to obtain each phase current composition of compensation;
C) obtain the phase information of three phase network voltage through the computing of phase-locked loop joint, and itself and predetermined amplitude multiplied each other obtain the fundamental active current composition;
D) with above b) and the electric current composition that c) obtains superimposed as final control command, control three-phase inverter output current;
E) drive signal of the said bidirectional switch device of generation to connect equalizing capacitance and dc bus capacitor by turns, redistributes unbalanced energy, until the dc capacitor voltage balance of every phase between the dc bus capacitor of each power model.
2. method according to claim 1 is characterized in that: the balance of voltage e) be meant the voltage of each dc bus capacitor equate basically, or in twos voltage deviation Δ u the regulation scope in.
3. method according to claim 1 is characterized in that: the traversal method perhaps is worth most the drive signal that comparison method generates said bidirectional switch device during through grade.
4. method according to claim 1 is characterized in that: said module number n confirms that according to the line voltage grade get n＞em/udc, wherein em is the line voltage amplitude, and udc is the dc capacitor voltage desired value of each power model.
5. according to the described method of claim 1, it is characterized in that: said equalizing capacitance size is close with the dc bus capacitor of power model.
6. according to the described method of claim 1, it is characterized in that: each phase current composition comprises idle, harmonic wave, uneven composition.
7. according to the described method of claim 1; It is characterized in that; The output current implementation method of control three-phase inverter is in the said step d): detect the three-phase inverter output current; And it and corresponding each control command are mutually done poor, and utilize the modulator approach of phase shift carrier wave to produce corresponding C PS-SPWM signal after regulating through PI, in order to drive the switching tube of each power model.
8. based on the chain type STATCOM DC voltage control circuit of equalizing capacitance, comprise three-phase Y-connection inverter, 3 equalizing capacitances, a n bidirectional switch device, transducer and microprocessors; It is characterized in that: three-phase Y-connection inverter joins through three inlet wire inductance and three phase network; Each is made up of inverter n 2H bridge inverter circuit module series connection that has the independent direct current lateral capacitance; Whenever, use 1 equalizing capacitance mutually, its two ends are connected with the dc bus capacitor two ends of n said inverter circuit module respectively, through the control of bidirectional switch device its with the conducting and the shutoff of the individual said dc bus capacitor of n; The output voltage of each inverter circuit module of sensor three-phase inverter, and export microprocessor to, the conducting and the shutoff of n bidirectional switch device of microprocessor control are until the dc capacitor voltage balance of every phase.
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Cited By (9)
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| CN103684018A (en) * | 2013-12-16 | 2014-03-26 | 苏州相城常理工技术转移中心有限公司 | Novel multi-level inverter capacitor voltage balanced circuit and control method thereof |
| CN104065061A (en) * | 2014-06-23 | 2014-09-24 | 许继电气股份有限公司 | STATCOM start modulation control method |
| CN106374729A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | High-voltage balance DC-side power supply of chain type high-voltage active filtering apparatus |
| CN106374730A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | Chain link voltage balancing device for three-phase chain high-voltage active power filter |
| CN107658890A (en) * | 2017-10-20 | 2018-02-02 | 国网湖南省电力公司 | The STATCOM reference voltages of transformer station's mixing reactive compensation system determine and control method |
| CN108233394A (en) * | 2018-02-10 | 2018-06-29 | 国家电网公司 | A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM |
| CN108599219A (en) * | 2018-01-29 | 2018-09-28 | 太原理工大学 | A kind of chain type STATCOM DC bus-bar voltage control device and methods |
| CN112152231A (en) * | 2020-09-08 | 2020-12-29 | 东北电力大学 | Direct-current voltage balance control method for chain-type STATCOM submodule |
| CN114156904A (en) * | 2021-12-07 | 2022-03-08 | 东北电力大学 | Capacitor voltage indirect detection method for chain type STATCOM submodule |
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| CN103684018A (en) * | 2013-12-16 | 2014-03-26 | 苏州相城常理工技术转移中心有限公司 | Novel multi-level inverter capacitor voltage balanced circuit and control method thereof |
| CN103684018B (en) * | 2013-12-16 | 2016-08-17 | 苏州相城常理工技术转移中心有限公司 | The multi-electrical level inverter capacitor voltage balance circuit of principle is refreshed based on electric charge |
| CN104065061A (en) * | 2014-06-23 | 2014-09-24 | 许继电气股份有限公司 | STATCOM start modulation control method |
| CN106374729A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | High-voltage balance DC-side power supply of chain type high-voltage active filtering apparatus |
| CN106374730A (en) * | 2015-07-23 | 2017-02-01 | 利思电气（上海）有限公司 | Chain link voltage balancing device for three-phase chain high-voltage active power filter |
| CN107658890A (en) * | 2017-10-20 | 2018-02-02 | 国网湖南省电力公司 | The STATCOM reference voltages of transformer station's mixing reactive compensation system determine and control method |
| CN108599219A (en) * | 2018-01-29 | 2018-09-28 | 太原理工大学 | A kind of chain type STATCOM DC bus-bar voltage control device and methods |
| CN108233394A (en) * | 2018-02-10 | 2018-06-29 | 国家电网公司 | A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM |
| CN112152231A (en) * | 2020-09-08 | 2020-12-29 | 东北电力大学 | Direct-current voltage balance control method for chain-type STATCOM submodule |
| CN114156904A (en) * | 2021-12-07 | 2022-03-08 | 东北电力大学 | Capacitor voltage indirect detection method for chain type STATCOM submodule |
| CN114156904B (en) * | 2021-12-07 | 2023-09-29 | 东北电力大学 | Chain type STATCOM submodule capacitor voltage indirect detection method |
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