CN108233394A - A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM - Google Patents

A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM Download PDF

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Publication number
CN108233394A
CN108233394A CN201810138590.2A CN201810138590A CN108233394A CN 108233394 A CN108233394 A CN 108233394A CN 201810138590 A CN201810138590 A CN 201810138590A CN 108233394 A CN108233394 A CN 108233394A
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China
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voltage
phase
statcom
current
capacitive coupling
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Inventor
刘安灵
梁昊
陈文献
王交通
杨洋
孙荣
张超
沙鹏
熊连松
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ANKANG POWER SUPPLY Co OF STATE GRID SHAANXI ELECTRIC POWER Co
State Grid Corp of China SGCC
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ANKANG POWER SUPPLY Co OF STATE GRID SHAANXI ELECTRIC POWER Co
State Grid Corp of China SGCC
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Priority to CN201810138590.2A priority Critical patent/CN108233394A/en
Publication of CN108233394A publication Critical patent/CN108233394A/en
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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
    • 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]

Abstract

The invention discloses a kind of capacitive coupling voltage balancing control method present invention suitable for Y type chain types STATCOM first to obtain three-phase modulations signal, itself and phase shift triangular carrier are compared again, final drive signal is can obtain, to drive the switching tube IGBT of each power module.Making full use of the overall active power controller that is widely used at present, on the basis of three layers of control structure that capacitor voltage balance controls in capacitive coupling voltage balancing control and phase, by the zero sequence voltage component for the capacitive coupling balance of voltage that each phase is superimposed in the final modulated signal of device, it can be realized and the energy of each DC bus capacitors of Y type H bridge chain type STATCOM is redistributed between each phase, the sum of each phase capacitance voltage is made to remain stable and balanced, it efficiently and securely solves and limits the critical issue that structure STATCOM is used in high-voltage large-capacity occasion, substantially increase the reliability of system, so as to which Y type H bridge chain types STATCOM be promoted to be to reliably applied to mesohigh large-capacity power equipment.

Description

A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM
Technical field
The invention belongs to power quality controlling research fields, and the chain type STATCOM's that more particularly to mesohigh Y types are coupled is straight Flow side capacitive coupling voltage balancing control method.
Background technology
The unreasonable configuration of reactive power can aggravate the loss of power equipment and electric line, the reactive power of impact Can also network voltage be caused to significantly change.Chain static synchronous compensator (Static Synchronous based on H bridges Compensator, STATCOM) can in mesohigh distribution system local compensation it is idle, improve points of common connection at voltage Stability improves the runnability of power grid.In addition, chain type STATCOM also has, level quantity is more, harmonic content is few, passive device The significant advantages such as part is small, favorable expandability obtain a large amount of concerns of academia and industrial quarters.
The DC side of chain H bridge STATCOM is connected by capacitor, and the DC capacitor of different H bridge modules is mutually isolated.Chain type STATCOM includes two kinds of Y types, Δ type main connection modes.Under identical voltage class, required for Y type chain types STATCOM H bridge modules it is less, system cost is relatively low, thus be mesohigh application in preferred topological structure.However, due to each H bridges list The difference of switching loss, shunt loss, modulation ratio and the pulse delay of member etc. so that there are direct currents between each H bridge modules Capacitance voltage imbalance problem, and then affect the quality of inverter output waveforms, the active reactive of unit module output, switch The voltage and current stress of device and static accurate precision, dynamic responding speed etc., greatly limit chain H bridge multi-level inverse conversion The performance of device performance.In transient process, particularly during asymmetric operation, STATCOM is very easy to DC voltage injustice occur Weighing apparatus.Therefore, it is necessary to control outside plus ensures that DC capacitor voltage is stablized, and it is each mutually and the DC bus capacitor in phase Voltage remains equal.
Existing DC capacitor voltage control strategy is broadly divided into hardware, two major class of software, and hardware approach mainly passes through Additional hardware circuit, provides additional active power channel, the active energy that compensating unit module needs, by using PWM rectification circuits, diode uncontrollable rectifier bridge, isolating transformer etc., realize the exchange of active energy.Hardware approach voltage equalizing It is good, but additional hardware circuit, of high cost, efficiency is needed to reduce.Software approach is then controlled using feedback closed loop.This method is not Hardware circuit can additionally be increased, reduce cost and the volume of device, be the emphasis studied at present.However, when Y shape connection In unbalanced run, in power transformer and load Y shape connection, they are not grounded STATCOM, Active power between phase and phase cannot exchange at this time, and the average active power for flowing in and out each phase is not zero, and leads to three The sum of capacitance voltage of a certain phase in phase will incrementally increase, and system will be out of service because of overvoltage.Therefore, Y types chain type STATCOM must take into consideration capacitance voltage Balance route problem during asymmetric operation, and the capacitance voltage between especially each phase is equal Weighing apparatus.
Invention content
The purpose of the present invention is to provide a kind of capacitive coupling voltage balancing control sides suitable for Y type chain types STATCOM Method.The present invention proposes the capacitive coupling voltage balancing control strategy injected based on zero sequence voltage component, and discloses zero sequence Specific execution of the amplitude phase calculation formula and the control strategy of component of voltage in Y type H bridge chain type STATCOM systems Step.This method can reliably control each power module DC capacitor voltages of Y type H bridge chain types STATCOM, stablize it, Equilibrium especially can be ensured that each alternate capacitance voltage is balanced, it is ensured that system under high-voltage large-capacity power utilization environment efficiently, Reliably work.
To achieve the above object, the present invention uses following technological means：
A kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM includes the following steps：
A) signal detection：Detect threephase load electric current and the three-phase compensation electricity of device output respectively by current sensor Stream detects three-phase power grid voltage by voltage sensor, and detects the DC side of 3N H bridge module respectively by voltage sensor Capacitance voltage；
B) Current calculation is compensated：According to instantaneous reactive power theory, rotation is synchronized to the threephase load electric current detected Turn coordinate transform, obtain each phase current ingredient for needing to compensate；
C) overall watt current calculates：The DC capacitor voltage of the 3N H bridge module detected is subjected to summation operation, is connect Get off and make the difference it with 3N times of DC capacitor voltage command value, the deviation voltage value is finally subjected to operation by pi regulator Later, the overall watt current instruction under dq coordinate systems is obtained；
D) voltage between phases balance control：Using alternate DC capacitor voltage control method, by the side for injecting residual voltage Method makes the active loss of each phase be compensated accordingly, while compensates the asymmetric electric current of load；
E) voltage balancing control in phase：The DC capacitor voltage of N number of H bridge modules that each phase detects is subjected to summation fortune It calculates, next it with N times of DC capacitor voltage command value is made the difference, finally carries out the deviation voltage value by pi regulator After operation, which with the voltage of corresponding phase is multiplied, obtains the superposition instruction of each phase modulated signal, and be superimposed As final modulated signal on to the modulated signal of each phase；
F) feed forward decoupling control：It is instructed according to the current-order that step b) is obtained as q shaft currents, step c) is obtained Current component is instructed as d shaft currents, and the three-phase fundamental modulation that device is obtained by the feed forward decoupling control under dq coordinate systems is believed Number, it is superimposed the trim component that step d) and step e) are generated on the basis of the modulated signal, and by the sum of above-mentioned three kinds of components As final modulated signal, CPS-SPWM signals are generated using phase shift carrier modulating method, to drive each power module Switching tube IGBT.
Preferably, in step b), the phase of the required PCC points voltage of synchronous rotating angleBy phase-lock-loop algorithm It obtains.
Preferably, in step b), current-order i is compensatedlqBy to threephase load current sample and instantaneous reactive current Detection algorithm obtains.
Preferably, in step c), watt current instruction ildBy being detected to 3N H bridge power modules DC capacitor voltage And total watt current control algolithm obtains.
Preferably, in step b), three-phase fundamental modulation signal be by detecting voltage on line side, device output current, it is and right It synchronizes rotating coordinate transformation and obtains the feed-forward voltage u under synchronous rotating framesd、usqAnd feedback current icd、icq, It is the command voltage u that can obtain device by feed forward decoupling control algorithmcd、ucq, command voltage after park inverse transformations by obtaining It arrives.
Preferably, in step d),
The phase of zero sequence voltage component is calculated first, and calculation formula is：
Wherein：For STATCOM current regulator a phases, the phase of b phase reference currents, and meet：
Wherein：U′sam、And U 'sbm、Respectively PCC point voltages usab、usbc、uscaIndirect measuring comes out virtual Line voltage and its phase, and meet：
Wherein, PCC point voltages usab、usbc、uscaIt is obtained by voltage sensor；
Next the amplitude U of zero sequence voltage component can be calculated0m, calculation formula is：
Preferably, the topological structure of Y types chain type STATCOM includes three phase network, reactive load, connects inductance and by N The linked storage structure that a H bridges single-phase inverter is composed in series, and pass through Y type knots between 3 linked storage structures Structure connects, and N is the power cell quantity per phase；Per phase linked storage structure by be connected in series with after inductance be parallel to it is public Tie point；N ＞ em/udc, wherein emTo access the voltage magnitude of power grid, udcDC side electricity for each H bridges single-phase inversion module Hold voltage desired value.
Through the above technical solutions, beneficial effects of the present invention are：
The present invention first obtains three-phase modulations signal, then itself and phase shift triangular carrier are compared, you can obtains final Drive signal, to drive the switching tube IGBT of each power module.The present invention has making full use of the totality being widely used at present On the basis of three layers of control structure that capacitor voltage balance controls in work(power control, capacitive coupling voltage balancing control and phase, By the zero sequence voltage component for the capacitive coupling balance of voltage that each phase is superimposed in the final modulated signal of device, you can real Now the energy of each DC bus capacitors of Y type H bridge chain type STATCOM between each phase is redistributed, makes each phase capacitance voltage The sum of remain and stablize and balanced efficiently and securely solve and limit structure STATCOM and make in high-voltage large-capacity occasion Critical issue substantially increases the reliability of system, so as to which Y type H bridge chain types STATCOM be promoted to be to reliably applied to middle height Press large-capacity power equipment.In addition, by building Y type H bridge chain type STATCOM simulation models, this control program is carried out Simulating, verifying, it was confirmed that the validity and reliability of the program.Although what is built in emulation is the tandem junction of every 12 modules of phase Structure, but this method can be extended to the series connection of any amount module in actual device, so as to which Y type H bridge chain types STATCOM be applied In the power utilization environment of various voltage class, therefore with practical engineering application value.
Description of the drawings
The structure diagram of Fig. 1 chain types STATCOM；
The systematic control algorithm block diagram of Fig. 2 chain types STATCOM；
Fig. 3 totality active power controller algorithm block diagrams；
Fig. 4 STATCOM voltage vector calculation flow charts；
Fig. 5 STATCOM current vector calculation flow charts；
Fig. 6 inverter output voltages and network voltage relationship vectors figure；
DC voltage Balance route flow chart between the every mutually each H bridge modules of Fig. 7；
Fig. 8 load current curve graphs；
Fig. 9 does not add power network current curve graph during alternate control；
Figure 10 adds the power network current curve graph after alternate control；
Figure 11 STATCOM output current curve graphs；
The zero sequence voltage component curve graph of Figure 12 injections；
The average value curve graph of Figure 13 three-phase CMI DC capacitor voltages.
Specific embodiment
Below from topological structure and control strategy two it is different in terms of be illustrated respectively：
The system structure of Y type H bridge chain types STATCOM as shown in Figure 1, including three phase network, reactive load, connection inductance with And be composed in series by N number of H bridges single-phase inverter linked storage structure (Cascaded Multilevel Inverter, CMI it), and between 3 CMI is connected by y-type structure, N is the power cell quantity per phase.Per phase CMI by being connected in series with electricity Points of common connection (Point of Common Coupling, PCC) is parallel to after sense.
1) topological structure：
Y type H bridge chain type STATCOM devices are connected by three connection inductance with three-phase AC grid；Device is each mutually by N A H-bridge inverter circuit block coupled in series for possessing independent direct current lateral capacitance is formed, and using Y type types of attachment, module between three-phase Quantity N can be determined according to the voltage class of access power grid, generally take N ＞ em/udc, wherein emTo access the voltage amplitude of power grid Value, udcDC capacitor voltage desired value for each H bridges single-phase inversion module.
2) control strategy：
A) signal detection：The three of threephase load electric current and device output are detected respectively by 6 Hall current sensors Phase current detects three-phase power grid voltage, and detect 3N by 3N Hall voltage sensor by 3 Hall voltage sensors The DC capacitor voltage of H bridge modules；
B) Current calculation is compensated：In control circuit board, according to instantaneous reactive power theory, the threephase load to detecting Electric current synchronizes rotating coordinate transformation, obtains each phase current ingredient --- reactive current, harmonic current, the negative phase-sequence for needing to compensate Electric current, zero-sequence current etc., it should be noted that the compensation electric current of Y type H bridge chain type STATCOM devices is usually with reactive current Based on；
C) overall watt current calculates：The DC capacitor voltage of the 3N H bridge module detected is subjected to summation operation, is connect Get off and make the difference it with 3N times of DC capacitor voltage command value, the deviation voltage value is finally subjected to operation by pi regulator Later, you can obtain the overall watt current instruction under dq coordinate systems；
D) voltage between phases balance control：Using alternate DC capacitor voltage control method disclosed by the invention, pass through injection The method of residual voltage makes the active loss of each phase be compensated accordingly, while compensates the asymmetric electric current of load, wherein The amplitude U of zero sequence voltage component0m, phaseCalculation formula is：
Wherein：For STATCOM current regulator a phases, the phase of b phase reference currents, and
U′sam、And U 'sbm、Respectively PCC point voltages usab、usbc、uscaThe virtual line voltage that indirect measuring comes out And its phase, and
Wherein, PCC point voltages usab、usbc、uscaIt is obtained by voltage sensor.
E) voltage balancing control in phase：The DC capacitor voltage of N number of H bridge modules that each phase detects is subjected to summation fortune It calculates, next it with N times of DC capacitor voltage command value is made the difference, finally carries out the deviation voltage value by pi regulator After operation, which is multiplied with the voltage of corresponding phase, you can obtain each phase modulated signal superposition instruction, and by its As final modulated signal on the modulated signal of each phase that is added to；
F) feed forward decoupling control：It is instructed according to current-order b) obtained as q shaft currents, the current component that will c) obtain It is instructed as d shaft currents, the three-phase fundamental modulation signal of device is obtained by the feed forward decoupling control under classical dq coordinate systems, Be superimposed trim component d) and e) generated on the basis of the modulated signal, and using above-mentioned three kinds of components and as final tune Signal processed generates CPS-SPWM signals, to drive the switching tube IGBT of each power module using phase shift carrier modulating method.
Y type H bridge chain types STATCOM device in the present invention uses now widely used carrier phase sinusoidal pulse width modulation Feedforward Decoupling under technology (Carrier Phase-Shifted SPWM, CPS-SPWM) and dq coordinate systems as shown in Figure 2 Control strategy.Wherein, compensation current-order ilqBy being obtained to threephase load current sample and instantaneous reactive current detection algorithm ；Watt current instructs ildBy controlling 3N H bridge power modules DC capacitor voltage detection and total watt current Algorithm obtains, as shown in Figure 3；Voltage on line side, device output current are detected, and rotating coordinate transformation is synchronized to it and is obtained together Walk the feed-forward voltage u under rotating coordinate systemsd、usqAnd feedback current icd、icq, above-mentioned physical quantity is by feed forward decoupling control calculation Method is that can obtain the command voltage u of devicecd、ucq, command voltage is by obtaining three-phase fundamental modulation letter after park inverse transformations Number, superposition utilizes voltage between phases balance method disclosed by the invention to generate the fine tuning for the transfer of alternate power on basis herein The fine tuning instruction that voltage balancing control generates in instruction and phase, you can obtain final three-phase modulations signal, then by itself and shifting Phase triangular carrier is compared, you can final drive signal is obtained, to drive the switching tube IGBT of each power module.
Capacitive coupling voltage balancing control method disclosed by the invention suitable for Y type H bridge chain types STATCOM is specific to walk It is rapid as follows：
1st, overall active power controller
The DC capacitor voltage of the 3N H bridge module detected is subjected to summation operation udc_sum, next by itself and 3N times DC capacitor voltage command value 3Nudc_refIt makes the difference, after the deviation voltage value finally is carried out operation by pi regulator, The overall watt current instruction under dq coordinate systems is can obtain, as shown in Figure 3；Wherein：
udc_ai、udc_bi、udc_ciRespectively actual samples to A, B, C three-phase in DC capacitor electricity per phase i-th of module Pressure, N are the number per phase H bridge modules.
2nd, capacitive coupling voltage balancing control
Using capacitive coupling voltage balancing control method disclosed by the invention, by injecting amplitude in each phase modulated signal The suitable zero sequence voltage component of phase, makes the active loss of each phase be compensated accordingly, you can realizes each phase capacitance voltage Summation is stable and equal, while compensates the asymmetric electric current of load, needs amplitude, the phase of the zero sequence voltage component injected It can gradually be obtained with following step.
The phase of zero sequence voltage component is calculated firstCalculation formula is：
Wherein：For STATCOM current regulator a phases, the phase of b phase reference currents, specifically as Fig. 5 is obtained , and
Wherein：U′sam、And U 'sbm、Respectively PCC point voltages usab、usbc、uscaIndirect measuring comes out virtual Line voltage and its phase, specific such as Fig. 4 are obtained, and
Wherein, PCC point voltages usab、usbc、uscaIt is obtained by voltage sensor.
Next the amplitude U of zero sequence voltage component can be calculated0m, calculation formula is：
In Figure 5, threephase load electric current iLa、iLb、iLcIt is obtained by current sensor, watt current instruction idc_pBy in Fig. 3 Control algolithm obtain.
The phase of the required PCC points voltage of synchronous rotating angle in Fig. 4, Fig. 5By phaselocked loop (Phase Locked Loop, PLL) algorithm acquisition.
3rd, capacitor voltage balance controls in phase
The DC capacitor voltage for N number of H bridge modules that each phase is detected carries out summation operation, next by itself and N times DC capacitor voltage command value makes the difference, finally by the deviation voltage value by pi regulator carry out operation after, by the result with The voltage of corresponding phase is multiplied, you can obtains the superposition instruction of each phase modulated signal, and the modulation letter for each phase that is added to As final modulated signal on number；Principle Analysis is as follows：
Because total active power is equal to total loss, so if having the voltage value high pressure set point of part of module, then Necessarily there is another part capacitance voltage to be less than rated value, i.e.,：The sum of total voltage remains unchanged, only different H bridge modules it Between unreasonable distribution.It is analyzed so that two H bridge modules are connected as an example.When the active power exchanged between inverter and power grid When determining, angleAs definite value, as shown in Figure 6.Wherein：ua_outRepresent A phase port voltages；usaRepresent power grid A phase voltages；Represent the declinate between inverter output voltage and network voltage.When inverter only exports reactive current,It is 0 °.It is practical In system, inverter port voltage ua_outWith network voltage usaBetween will have an angleIf fundamental active current value idc_pIt determines, thenAlso it is definite value.Obviously, the target of third layer control is to make udc_a1、udc_a2The vector met in Fig. 6 closes System, size is identical, and direction all differs between network voltageAt this time due to ua_outIt has been be to determine that, so working as udc_ai Size meet reference value, then can reach requirement.The block diagram that capacitance voltage controls in third layer phase is as shown in Figure 7.Wherein：va、 vb、vcPWM modulation wave for inverter.By taking A phases as an example, udc_aiFor i-th of H-bridge unit module DC voltage of A phases, urefFor The reference value of DC voltage, Δ v 'aiFine tuning for i-th of H-bridge unit PWM modulation wave of inverter A phases instructs.
Using above-mentioned three kinds of modulated signals and as final modulated signal, phase shift carrier modulating method is utilized to generate CPS- SPWM signals, to drive the switching tube IGBT of each power module.
The present invention in the final modulated signal of device by being superimposed the zero sequence for the capacitive coupling balance of voltage of each phase Component of voltage, you can realize that the energy of each DC bus capacitors of Y type H bridge chain type STATCOM is redistributed between each phase, make The sum of each phase capacitance voltage remains stable and balanced, efficiently and securely solves and limits structure STATCOM in high pressure The critical issue that large capacity occasion uses substantially increases the reliability of system, so as to promote Y type H bridge chain types STATCOM reliable Ground is equipped applied to mesohigh large-capacity power.
Capacitive coupling voltage balancing control method disclosed by the invention suitable for Y type H bridge chain types STATCOM.And it utilizes Simulink in MATLAB has carried out simulating, verifying to the control method.CMI in emulation employs 12 H bridge power modules Series connection, devices switch frequency are 1kHz, and power grid phase voltage peak value is 311V, frequency 50Hz, DC bus capacitor 7200uF, H Bridge module DC voltage reference value is 38V, and the resistance of in parallel per mutually different H bridge capacitances both ends 200~600 not grades are with mould Intend the loss of power cell, load and hinder inductive load for asymmetry.Fig. 8 is threephase load electric current, occurs certain journey in 0.08s The asymmetry of degree；Fig. 9 is power network current waveform when not adding the control of capacitive coupling voltage；Figure 10 is to add in capacitive coupling voltage control Three phase network current waveform after system, it is seen that it is symmetrical always；Figure 11 is using the chain after voltage between phases control method Formula STATCOM output current waves.Figure 12 is the zero sequence voltage component calculated using control method of the present invention；Figure 13 is chain type The DC capacitor voltage average value of mono- phase CMI of STATCOM, in load current symmetrically with asymmetry when all be stablize and it is balanced. Simulation result shows：Y type H bridge chain type STATCOM capacitive coupling voltage balancing control methods realize chain type STATCOM DC sides Stabilization of the capacitance voltage in alternate and phase with balanced, can ensuring equipment for a long time it is safe and stable, efficiently work, have Highly important practical engineering value.
The capacitive coupling voltage balancing control method suitable for Y type H bridge chain types STATCOM of the present invention, and utilize Simulink tools in MATLAB have carried out simulating, verifying to the control method.From simulation result it can be seen that, program energy Enough significantly stable DC lateral capacitance voltage, and make each phase CMI capacitance voltages balanced and equal, efficiently and securely solve limit The critical issue that structure STATCOM is used in high-voltage large-capacity occasion is made, substantially increases the reliability of system, so as to promote Y type H bridge chain types STATCOM is to reliably applied to mesohigh large-capacity power equipment, has practical engineering application value.
The angle of the present invention active energy exchange between device and power grid, in three layers of control for inheriting existing classics On the basis of thought processed, solves capacitive coupling voltage balancing control problem existing for Y type chain types STATCOM, it is proposed that base In the control strategy of zero sequence voltage component injection, and disclose the amplitude phase calculation formula of zero sequence voltage component and be somebody's turn to do Specific execution step of the control strategy in Y type H bridge chain type STATCOM systems.Wherein, classical muti-layer control tactics include Three levels：First layer is controlled for total watt current, determines the big of inverter and total active power of electricity exchange between grids It is small；Balance control of the second layer between three-phase, the method by injecting residual voltage make the active loss of each phase obtain phase The compensation answered, while the asymmetric electric current of load namely the main protection content of the present invention can be compensated；Third layer is each in phase The capacitance voltage Balance route of intermodule.Simulation result shows：Chain type STACOM is not only able to the idle need of quick response load It asks, while the DC capacitor voltage between each phase can also fast and effeciently be controlled to balance, substantially increase the reliability of system And technical performance, product development cycle is shortened, so as to which Y type chain types STATCOM be promoted to be to reliably applied to mesohigh large capacity Electrical circuitry equipment.
The above content is combine specific case further description made for the present invention, it is impossible to assert the present invention's Specific embodiment is only limitted to this, for those of ordinary skill in the art to which the present invention belongs, is not departing from the present invention Under the premise of design, several simple deduction or replace can also be made, should all be considered as belonging to the right that the present invention is submitted The scope of patent protection that claim determines.

Claims (7)

  1. A kind of 1. capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM, which is characterized in that including following Step：
    A) signal detection：Detect threephase load electric current and the three-phase compensation electric current of device output respectively by current sensor, Three-phase power grid voltage is detected by voltage sensor, and detects the DC side electricity of 3N H bridge module respectively by voltage sensor Hold voltage；
    B) Current calculation is compensated：According to instantaneous reactive power theory, rotation is synchronized to the threephase load electric current detected and is sat Mark transformation, obtains each phase current ingredient for needing to compensate；
    C) overall watt current calculates：The DC capacitor voltage of the 3N H bridge module detected is subjected to summation operation, next It is made the difference with 3N times of DC capacitor voltage command value, finally by the deviation voltage value by pi regulator carry out operation it Afterwards, the overall watt current instruction under dq coordinate systems is obtained；
    D) voltage between phases balance control：Using alternate DC capacitor voltage control method, the method by injecting residual voltage makes The active loss of each phase is compensated accordingly, while compensates the asymmetric electric current of load；
    E) voltage balancing control in phase：The DC capacitor voltage for N number of H bridge modules that each phase is detected carries out summation operation, connects Get off and make the difference it with N times of DC capacitor voltage command value, the deviation voltage value is finally subjected to operation by pi regulator Later, which with the voltage of corresponding phase is multiplied, obtains the superposition instruction of each phase modulated signal, and it is each to be added to As final modulated signal on the modulated signal of phase；
    F) feed forward decoupling control：It is instructed according to the current-order that step b) is obtained as q shaft currents, the electric current that step c) is obtained Ingredient is instructed as d shaft currents, and the three-phase fundamental modulation signal of device is obtained by the feed forward decoupling control under dq coordinate systems, Be superimposed the trim component that step d) and step e) are generated on the basis of the modulated signal, and using above-mentioned three kinds of components and as most Whole modulated signal generates CPS-SPWM signals, to drive the switching tube of each power module using phase shift carrier modulating method IGBT。
  2. 2. a kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM according to claim 1, It is characterized in that, in step b), the phase of the required PCC points voltage of synchronous rotating angleIt is obtained by phase-lock-loop algorithm It takes.
  3. 3. a kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM according to claim 1, It is characterized in that, in step b), current-order i is compensatedlqBy being detected to threephase load current sample and instantaneous reactive current Algorithm obtains.
  4. 4. a kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM according to claim 1, It is characterized in that, in step c), watt current instruction ildBy to the detection of 3N H bridge power modules DC capacitor voltage and Total watt current control algolithm obtains.
  5. 5. a kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM according to claim 1, It is characterized in that, in step b), three-phase fundamental modulation signal be by detecting voltage on line side, device output current, and to its into Row synchronous rotating angle obtains the feed-forward voltage u under synchronous rotating framesd、usqAnd feedback current icd、icq, pass through Feed forward decoupling control algorithm is the command voltage u that can obtain devicecd、ucq, command voltage after park inverse transformations by obtaining.
  6. 6. a kind of capacitive coupling voltage balancing control method suitable for Y type chain types STATCOM according to claim 1, It is characterized in that, in step d),
    The phase of zero sequence voltage component is calculated first, and calculation formula is：
    Wherein：For STATCOM current regulator a phases, the phase of b phase reference currents, and meet：
    Wherein：U′sam、And U 'sbm、Respectively PCC point voltages usab、usbc、uscaThe virtual line voltage that indirect measuring comes out And its phase, and meet：
    Wherein, PCC point voltages usab、usbc、uscaIt is obtained by voltage sensor；
    Next the amplitude U of zero sequence voltage component can be calculated0m, calculation formula is：
  7. 7. a kind of capacitive coupling voltage suitable for Y type chain types STATCOM according to claim 1 to 6 any one is put down Weigh control method, which is characterized in that the topological structure of Y type chain types STATCOM includes three phase network, reactive load, connection inductance And the linked storage structure being composed in series by N number of H bridges single-phase inverter, and lead between 3 linked storage structures Y-type structure connection is crossed, N is the power cell quantity per phase；Per phase linked storage structure by being connected in series with after inductance simultaneously It is linked to points of common connection；N ＞ em/udc, wherein emTo access the voltage magnitude of power grid, udcFor each H bridges single-phase inversion module DC capacitor voltage desired value.
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109245120A (en) * 2018-11-10 2019-01-18 深圳市禾望电气股份有限公司 Static reactive generator and its control method, storage medium
NL2021569B1 (en) * 2018-08-14 2019-05-01 Univ Central South Method and system for hierarchically controlling cascaded statcom system
CN109951090A (en) * 2019-04-01 2019-06-28 中国矿业大学(北京) The unidirectional cascade multi-level electronic power convertor dc-voltage balance strategy of three-phase
CN109980962A (en) * 2019-04-01 2019-07-05 中国矿业大学(北京) The unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase
CN109995047A (en) * 2019-01-29 2019-07-09 西北工业大学 A kind of non-equilibrium model predictive control method of triangle chain type STATCOM
CN110994705A (en) * 2019-11-22 2020-04-10 广西交通职业技术学院 Common direct current bus bidirectional converter with power quality control function and control method thereof
CN112909961A (en) * 2021-03-18 2021-06-04 北方工业大学 Direct-current side voltage balance control method of chain type STATCOM
CN113364003A (en) * 2021-06-22 2021-09-07 荣信汇科电气股份有限公司 Star-connected STATCOM multiple overload control method under power grid unbalance condition

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102780227A (en) * 2012-08-08 2012-11-14 西安交通大学 Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor
CN102780226A (en) * 2012-08-08 2012-11-14 西安交通大学 Direct-current-side voltage control method of cascaded STATCOM (static var compensator) based on chopping-control voltage sharing and control circuit
CN105471312A (en) * 2015-12-22 2016-04-06 合肥工业大学 Three-phase cascade H bridge photovoltaic grid-connected inverter interphase power balance control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102780227A (en) * 2012-08-08 2012-11-14 西安交通大学 Chained static compensator (STATCOM) direct-current-side voltage controlling method and controlling circuit based on voltage-sharing capacitor
CN102780226A (en) * 2012-08-08 2012-11-14 西安交通大学 Direct-current-side voltage control method of cascaded STATCOM (static var compensator) based on chopping-control voltage sharing and control circuit
CN105471312A (en) * 2015-12-22 2016-04-06 合肥工业大学 Three-phase cascade H bridge photovoltaic grid-connected inverter interphase power balance control method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
刘安灵等: ""Y形链式STATCOM的相间电容电压平衡控制策略研究"", 《智慧电力》 *

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2021569B1 (en) * 2018-08-14 2019-05-01 Univ Central South Method and system for hierarchically controlling cascaded statcom system
CN109245120A (en) * 2018-11-10 2019-01-18 深圳市禾望电气股份有限公司 Static reactive generator and its control method, storage medium
CN109995047A (en) * 2019-01-29 2019-07-09 西北工业大学 A kind of non-equilibrium model predictive control method of triangle chain type STATCOM
CN109995047B (en) * 2019-01-29 2023-01-31 西北工业大学 Unbalanced model prediction control method of triangular chained STATCOM
CN109980962B (en) * 2019-04-01 2019-11-15 中国矿业大学(北京) The unidirectional Cascaded multi-level converter dc-voltage balance modulation control method of three-phase
CN109951090B (en) * 2019-04-01 2019-10-22 中国矿业大学(北京) The unidirectional cascade multi-level electronic power convertor DC voltage balance control method of three-phase
CN109980962A (en) * 2019-04-01 2019-07-05 中国矿业大学(北京) The unidirectional Cascaded multi-level converter dc-voltage balance modulation strategy of three-phase
CN109951090A (en) * 2019-04-01 2019-06-28 中国矿业大学(北京) The unidirectional cascade multi-level electronic power convertor dc-voltage balance strategy of three-phase
CN110994705A (en) * 2019-11-22 2020-04-10 广西交通职业技术学院 Common direct current bus bidirectional converter with power quality control function and control method thereof
CN110994705B (en) * 2019-11-22 2023-07-21 广西交通职业技术学院 Common direct current bus bidirectional converter with electric energy quality control function and control method thereof
CN112909961A (en) * 2021-03-18 2021-06-04 北方工业大学 Direct-current side voltage balance control method of chain type STATCOM
CN112909961B (en) * 2021-03-18 2023-02-28 北方工业大学 Direct-current side voltage balance control method of chain type STATCOM
CN113364003A (en) * 2021-06-22 2021-09-07 荣信汇科电气股份有限公司 Star-connected STATCOM multiple overload control method under power grid unbalance condition
CN113364003B (en) * 2021-06-22 2024-02-20 荣信汇科电气股份有限公司 Star-connection type STATCOM multiple overload control method under unbalanced power grid condition

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