CN111313455A - Control method for suppressing commutation failure of energy storage STATCOM and inverter control method - Google Patents

Control method for suppressing commutation failure of energy storage STATCOM and inverter control method Download PDF

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CN111313455A
CN111313455A CN202010115669.0A CN202010115669A CN111313455A CN 111313455 A CN111313455 A CN 111313455A CN 202010115669 A CN202010115669 A CN 202010115669A CN 111313455 A CN111313455 A CN 111313455A
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voltage
inverter
current
invq
invd
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CN111313455B (en
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罗安
陈斌超
周小平
洪乐荣
夏海涛
刘一峰
朱仁龙
尹寒航
邓凌峰
舒钰成
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Hunan University
State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
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Hunan University
State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
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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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
    • H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
    • 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
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • Y02E40/30—Reactive power compensation
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

Abstract

The invention discloses a control method for suppressing commutation failure of an energy storage STATCOM and an inverter control method, wherein the energy storage STATCOM comprises the following steps: the device comprises a storage battery pack, a DC/DC converter, a direct current side capacitor, a DC/AC converter, a filter and a controller. When the HVDC receiving end has a ground short circuit fault, the method can be used for inhibiting the phase commutation failure caused by voltage drop. The storage battery pack is used as an energy storage link, the DC/DC converter provides stable direct current voltage for the direct current side capacitor, and when the direct current side capacitor supplies power normally, the DC/AC converter maintains the voltage of the receiving end alternating current bus to be relatively stable. The filter is used for filtering high-frequency harmonic components in the output voltage and current, and the energy storage type STATCOM is connected to the receiving end converter bus through the booster transformer, the circuit breaker and the isolating switch. In addition, the invention also provides a negative sequence compensation control method which can effectively compensate voltage drop caused by asymmetric faults. The invention can be applied to a receiving-end converter station of high-voltage direct-current transmission, and effectively improves the immunity to commutation failure.

Description

Control method for suppressing commutation failure of energy storage STATCOM and inverter control method
Technical Field
The invention relates to the field of suppression of commutation failure of high-voltage direct-current power transmission, and is suitable for suppressing commutation failure caused by three-phase and single-phase voltage drop by using an energy storage type STATCOM.
Background
A converter element adopted by the power grid commutation converter type high-voltage direct-current transmission (LCC-HVDC) is a thyristor without self-turn-off capability, and the system has the risk of commutation failure. The continuous commutation failure reduces the transmitted active power, causes the frequency fluctuation of a receiving-end power grid and the large consumption of reactive power, and brings threat to the stable operation of a receiving-end alternating current system. The STATCOM device is adopted for dynamic reactive power compensation, and increasing the commutation voltage time area is a feasible measure for inhibiting commutation failure.
Under the normal condition, the capacitance value of the direct current side capacitor of the STATCOM is large, the amplitude of the access point voltage is temporarily reduced when the power grid fails, the phase is suddenly changed, and the reactive power exchange between the STATCOM and the system is influenced, so that the voltage of the direct current side capacitor is fluctuated, more harmonic waves exist in the output voltage, and the phase change is not facilitated. The energy storage type STATCOM makes up the self loss of the STATCOM device through an energy storage link, has a more stable direct current side than the traditional STATCOM, has lower distortion rate of output voltage and current, and still can provide stable reactive power output under the condition of alternating voltage drop. In addition, the conventional STATCOM needs to be controlled respectively under a positive sequence coordinate system and a negative sequence coordinate system after positive sequence and negative sequence separation during unbalance compensation, and is complex.
Disclosure of Invention
The invention aims to solve the technical problem that in order to overcome the defects in the prior art, the invention provides a control method for inhibiting commutation failure of an energy storage STATCOM and an inverter control method, so that the occurrence of commutation failure is effectively inhibited.
The technical scheme adopted by the invention is as follows: a control method for suppressing commutation failure of an energy storage STATCOM is suitable for suppressing commutation failure of high-voltage direct-current transmission; the energy storage type STATCOM system comprises a storage battery pack, a DC/DC converter, a direct current side capacitor, an inverter, an output filter and a controller; the storage battery pack is connected to a direct-current side capacitor through a DC/DC converter; the inverter is connected with the direct current side capacitor; the filter is connected with the inverter, and the controller is connected with the drive protection circuit; the drive protection circuit is connected with the DC/DC converter and the inverter; the controller is connected with the sampling circuit; the controller mainly comprises a phase-locked loop module, a low-pass filter module, a high-pass filter module, a dq conversion and inverse conversion module, a current inner loop decoupling module, a PI control module and a PR control module; the method comprises the following steps:
1) at the starting point of each sampling period, outputting current i to the storage batterybatDC side capacitor voltage UdcPrimary side of step-up transformerThree-phase voltage ucxAnd the inverter outputs three-phase current iinvxSampling is carried out; (x ═ a, b, c).
2) The primary side voltage u of the step-up transformer sampled in the step 1)cxSending into PLL to obtain current voltage phase thetac；
3) DC/DC converter converts DC side reference voltage U* dcAnd DC side capacitor voltage UdcMaking difference and sending the difference to a PI controller to obtain a current inner loop instruction i of the DC/DC converter* bat，i* batAnd the output current i of the storage batterybatThe difference is sent to a PI controller to obtain a driving signal v of the DC/DC converterdc；
4) The voltage phase theta in the step 2) is converted intocAnd ucxSending the voltage into a dq conversion module to obtain a voltage dq axis component ucd，ucq. Will thetacAnd iinvxThe dq component i of the output current of the inverter is obtained by sending the dq component i to a dq conversion moduleinvdAnd iinvq. The effective value U of the primary side voltage of the step-up transformer can be obtained by the dq axis component of the voltagermsThe calculation formula is as follows:
Figure BDA0002391423070000021
5) active command P of inverter*Converted into d-axis current instruction i* invdThe specific calculation formula is as follows:
Figure BDA0002391423070000022
q-axis current command i* invqBy using the primary side reference voltage effective value U of the step-up transformer* rmsEffective value U of actual voltagermsAnd sending the difference to a PI controller to obtain the difference. Then i is put* invdAnd i* invqAnd i is low-pass filteredinvd、iinvqSending the current into an inner loop decoupling module to obtain uinvd1And uinvq1The specific calculation formula is as follows.
Figure BDA0002391423070000023
Where ω is the grid angular frequency of the PLL output, LfIs a filter inductance, Kp，KiFor the PI controller parameters:
6) the dq axis component i of the inverter output current obtained in the step 4)invdAnd iinvqHigh-pass filtering is carried out to obtain negative sequence component i of inverter output current with frequency of about 100Hz- invdAnd i- invq. The negative sequence component of the current is sent to a PR control module to obtain uinvd2And uinvq2。
7) Adding the results of step 5) and step 6) to obtain an inverter reference voltage output under the dq axis,
namely:
Figure BDA0002391423070000031
8) subjecting u obtained in step 7) toinvdAnd uinvqRotating and transforming the voltage to be in an abc coordinate system to obtain a reference output voltage v in the abc coordinate systeminva，vinvb，vinvcThe calculation formula is as follows:
Figure BDA0002391423070000032
and the reference output voltage is subjected to scaling and amplitude limiting to obtain an inverter driving signal.
9) The drive signal v of the DC/DC converter obtained in the step 3) and the step 2)dcAnd a drive signal v of the inverterinva，vinvb，vinvcAnd transmitting the voltage to a drive protection circuit for driving the DC/DC converter and the inverter.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a method for maintaining the voltage stability of a capacitor at the direct current side by adopting an energy storage link, and compared with the traditional STATCOM, the method has the advantages that the distortion rate of an output reactive current waveform is lower, and the compensation effect is better. The shock resistance and load resistance are strong, and the effect of peak clipping and valley filling can be achieved. When a voltage drop occurs on a current conversion bus at the receiving end of the high-voltage direct-current transmission system, the occurrence of phase conversion failure can be effectively inhibited. Meanwhile, aiming at the condition of single-phase voltage drop, the PR controller is adopted to control the negative sequence output current, the control under a positive-negative sequence rotating coordinate system is avoided, and the method is more convenient and effective to realize in an actual controller.
Drawings
Fig. 1 is a schematic structural diagram of an energy storage STATCOM according to an embodiment of the invention;
FIG. 2 is a block diagram of a DC/AC portion of an energy storage STATCOM controller according to an embodiment of the present invention;
fig. 3 is a block diagram of a DC/DC portion of an energy storage STATCOM controller according to an embodiment of the invention.
Detailed Description
Fig. 1 is a schematic structural diagram of an energy storage type STATCOM according to an embodiment of the present invention, including a storage battery pack, a DC/DC converter, a DC side capacitor, and an output filter; the storage battery pack is connected to a direct-current side capacitor through a DC/DC converter; the inverter is connected with the direct current side capacitor; the filter is connected with the inverter, and the controller is connected with the drive protection circuit; the drive protection circuit is connected with the DC/DC converter and the inverter; the controller is connected with the sampling circuit; the control system comprises a controller, a sampling circuit and a drive protection circuit.
Fig. 2 and fig. 3 are block diagrams of an energy storage type STATCOM phase commutation failure suppression controller according to an embodiment of the present invention, which mainly include a phase-locked loop module, a low-pass filter module, a high-pass filter module, a dq transformation and inverse transformation module thereof, a current inner loop decoupling module, a PI control module, and a PR control module, and the specific control method includes the following steps:
1) at the starting point of each sampling period, outputting current i to the storage batterybatDC side capacitor voltage UdcPrimary side three-phase voltage u of step-up transformercx(x ═ a, b, c) and inverter output three-phase current iinvx(x ═ a, b, c) sampling;
2) the primary side voltage u of the step-up transformer sampled in the step 1)cx(x ═ a, b, c) is sent to the PLL to obtain the current voltage phase θc；
3) DC/DC converter converts DC side reference voltage U* dcAnd DC side capacitor voltage UdcMaking difference and sending the difference to a PI controller to obtain a current inner loop instruction i of the DC/DC converter* bat，i* batAnd the output current i of the storage batterybatThe difference is sent to a PI controller to obtain a driving signal v of the DC/DC converterdc；
4) The voltage phase theta in the step 2) is converted intocAnd ucx(x ═ a, b, c) is sent to a dq conversion module to obtain a voltage dq axis component ucd，ucq. Obtaining dq axis component i of inverter output current by the same methodinvdAnd iinvq. The effective value U of the primary side voltage of the step-up transformer can be obtained by the dq axis component of the voltagermsThe calculation formula is as follows:
Figure BDA0002391423070000041
5) active command P of inverter*Converted into d-axis current instruction i* invdThe specific calculation formula is as follows:
Figure BDA0002391423070000042
q-axis current command i* invqBy using the primary side reference voltage effective value U of the step-up transformer* rmsEffective value U of actual voltagermsAnd sending the difference to a PI controller to obtain the difference. Then i is put* invd、i* invqAnd i is low-pass filteredinvd、iinvqSending the current into an inner loop decoupling module to obtain uinvd1And uinvq1The specific calculation formula is as follows:
Figure BDA0002391423070000043
wherein L isfTo output the inductance value of the filter, ω is the PLL outputOf (c) is detected.
6) The dq axis component i of the inverter output current obtained in the step 4)invdAnd iinvqHigh-pass filtering is carried out to obtain negative sequence component i of inverter output current with frequency of about 100Hz- invdAnd i- invq. The negative sequence component of the current is sent to a PR control module to obtain uinvd2And uinvq2。
7) Adding the results of step 5) and step 6) to obtain the inverter reference voltage output under dq axis, namely:
Figure BDA0002391423070000051
8) subjecting u obtained in step 7) toinvdAnd uinvqRotating and transforming the voltage to be in an abc coordinate system to obtain a reference output voltage v in the abc coordinate systeminva，vinvb，vinvcThe calculation formula is as follows:
Figure BDA0002391423070000052
9) the drive signal v of the DC/DC converter obtained in the step 3) and the step 2)dcAnd a drive signal v of the inverterinva，vinvb，vinvcAnd transmitting the voltage to a drive protection circuit for driving the DC/DC converter and the inverter.

Claims (3)

1. A control method for suppressing commutation failure by using an energy storage STATCOM, wherein the energy storage STATCOM comprises a storage battery, a DC/DC converter, a DC side capacitor, an inverter, an output filter and a controller; the storage battery pack is connected to a direct-current side capacitor through a DC/DC converter; the inverter is connected with the direct current side capacitor; the output filter is connected with the inverter, and the controller is connected with the drive protection circuit and the sampling circuit; the drive protection circuit is connected with the DC/DC converter and the inverter; the method is characterized by comprising the following steps:
1) at the starting point of each sampling period, outputting current i to the storage battery packbatDC side capacitor voltage UdcPrimary side three-phase voltage u of step-up transformercxAnd the inverter outputs three-phase current iinvxSampling is carried out; x is a, b, c;
2) the primary side voltage u of the step-up transformer sampled in the step 1)cxSending into PLL to obtain current voltage phase thetac；
3) Reference voltage U at DC side* dcAnd DC side capacitor voltage UdcMaking a difference, sending the difference value to a PI controller to obtain a current inner loop instruction i of the DC/DC converter* bat，i* batAnd the output current i of the accumulator batterybatThe difference is sent to a PI controller to obtain a driving signal v of the DC/DC converterdc；
4) The current voltage phase theta is converted intocAnd ucxSending the voltage into a dq conversion module to obtain a voltage dq axis component ucd，ucqWill thetacAnd iinvxThe dq component i of the output current of the inverter is obtained by sending the dq component i to a dq conversion moduleinvdAnd iinvq(ii) a Calculating the effective value U of the primary side voltage of the step-up transformer from the dq axis component of the voltagerms；
5) Active command P of inverter*Converted into d-axis current instruction i* invdThe specific calculation formula is as follows:
Figure FDA0002391423060000011
q-axis current command i* invqBy using the primary side reference voltage effective value U of the step-up transformer* rmsEffective value U of actual voltagermsThe difference is sent to a PI controller to obtain; will i* invd、i* invqAnd i is low-pass filteredinvd、iinvqSending the current into an inner loop decoupling module to obtain uinvd1And uinvq1The specific calculation formula is as follows:
Figure FDA0002391423060000012
where ω is the grid angular frequency of the PLL output, LfIs a filter inductance, Kp，KiFor the PI controller parameters:
6) the dq axis component i of the inverter output current obtained in the step 4)invdAnd iinvqCarrying out high-pass filtering to obtain negative sequence component i of output current of the inverter- invdAnd i- invq(ii) a Feeding the negative sequence component of the current into a PR controller to obtain uinvd2And uinvq2；
7) Using uinvd1And uinvq1、uinvd2And uinvq2Obtaining the inverter reference voltage output u under the dq axisinvd、uinvqNamely:
Figure FDA0002391423060000021
8) subjecting u obtained in step 7) toinvdAnd uinvqRotating and transforming the voltage to be in an abc coordinate system to obtain a reference output voltage v in the abc coordinate systeminva，vinvb，vinvcThe calculation formula is as follows:
Figure FDA0002391423060000022
and the reference output voltage is subjected to scaling and amplitude limiting to obtain an inverter driving signal.
9) The drive signal v of the DC/DC converter obtained in the step 3) and the step 8) is useddcAnd a drive signal v of the inverterinva，vinvb，vinvcAnd transmitting the voltage to a drive protection circuit for driving the DC/DC converter and the inverter.
2. The method as claimed in claim 1, wherein the boost transformer has a primary side voltage effective value of UrmsThe calculation formula is as follows:
Figure FDA0002391423060000023
3. an inverter control method of an energy storage STATCOM is characterized by comprising the following steps:
1) at the starting point of each sampling period, the primary side three-phase voltage u of the step-up transformer is subjected tocxAnd the inverter outputs three-phase current iinvxSampling is carried out; x is a, b, c;
2) the primary side voltage u of the step-up transformer sampled in the step 1)cxSending into PLL to obtain current voltage phase thetac；
3) The current voltage phase theta is converted intocAnd ucxSending the voltage into a dq conversion module to obtain a voltage dq axis component ucd，ucqWill thetacAnd iinvxThe dq component i of the output current of the inverter is obtained by sending the dq component i to a dq conversion moduleinvdAnd iinvq(ii) a Calculating the effective value U of the primary side voltage of the step-up transformer from the dq axis component of the voltagerms；
4) Active command P of inverter*Converted into d-axis current instruction i* invdThe specific calculation formula is as follows:
Figure FDA0002391423060000031
q-axis current command i* invqBy using the primary side reference voltage effective value U of the step-up transformer* rmsEffective value U of actual voltagermsThe difference is sent to a PI controller to obtain; will i* invd、i* invqAnd i is low-pass filteredinvd、iinvqSending the current into an inner loop decoupling module to obtain uinvd1And uinvq1The specific calculation formula is as follows.
Figure FDA0002391423060000032
Where ω is the PLL inputAngular frequency of the outgoing power grid, LfIs a filter inductance, Kp，KiFor the PI controller parameters:
5) the dq axis component i of the inverter output current obtained in the step 4)invdAnd iinvqCarrying out high-pass filtering to obtain negative sequence component i of output current of the inverter- invdAnd i- invq(ii) a Feeding the negative sequence component of the current into a PR controller to obtain uinvd2And uinvq2；
6) Using uinvd1And uinvq1、uinvd2And uinvq2Obtaining the inverter reference voltage output u under the dq axisinvd、uinvqNamely:
Figure FDA0002391423060000033
7) u obtained in step 6)invdAnd uinvqRotating and transforming the voltage to be in an abc coordinate system to obtain a reference output voltage v in the abc coordinate systeminva，vinvb，vinvcThe calculation formula is as follows:
Figure FDA0002391423060000034
and the reference output voltage is subjected to scaling and amplitude limiting to obtain an inverter driving signal.
8) Driving signal v of the inverter in the step 7)inva，vinvb，vinvcAnd transmitting the voltage to a drive protection circuit for driving the inverter.
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Publication number Priority date Publication date Assignee Title
CN111786396A (en) * 2020-07-10 2020-10-16 国网湖南省电力有限公司 High-voltage direct-current power transmission system commutation failure suppression method based on energy storage type chain STATCOM
CN111786396B (en) * 2020-07-10 2023-12-12 国网湖南省电力有限公司 Phase-change failure suppression method for high-voltage direct-current transmission system based on energy storage type chained STATCOM

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