CN112234625B - Practical direct-current continuous commutation failure suppression device and method based on phase modulator and stability system - Google Patents

Practical direct-current continuous commutation failure suppression device and method based on phase modulator and stability system Download PDF

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CN112234625B
CN112234625B CN202010956618.0A CN202010956618A CN112234625B CN 112234625 B CN112234625 B CN 112234625B CN 202010956618 A CN202010956618 A CN 202010956618A CN 112234625 B CN112234625 B CN 112234625B
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direct current
phase
phase modulator
commutation failure
control system
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CN112234625A (en
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肖繁
周友斌
周鲲鹏
王涛
张侃君
李鹏
陈堃
黎恒炫
叶庞琪
杜镇安
王婷
文博
饶渝泽
张隆恩
陈永昕
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State Grid Corp of China SGCC
State Grid Hubei Electric Power Co Ltd
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Hubei Electric Power Co Ltd
Electric Power Research Institute of State Grid Hubei 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
    • 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
    • H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
    • H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
    • H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
    • H02J13/00017—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using optical fiber
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/006—Means for protecting the generator by using control
    • 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

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Abstract

The invention provides a practical direct current continuous commutation failure suppression device and a method based on a phase modulator and a stability system, wherein the device comprises the phase modulator, a phase modulator control system and a direct current control protection system; the phase modulator is used for acquiring direct current bus voltage and direct current information from a direct current bus and sending the direct current information to the phase modulator control system; the phase modulator control system is used for judging whether phase commutation failure occurs to direct current according to direct current bus voltage and direct current information input by the phase modulator, if so, the phase modulator control system controls the phase modulator to enter a forced excitation state, otherwise, the phase modulator control system judges whether a direct current phase commutation failure signal sent by the direct current control protection system is received, and if so, the phase modulator control system controls the phase modulator to enter the forced excitation state. The phase modifier reactive power supporting method can improve the reactive power supporting capability of the phase modifier, reduce the risk of direct current commutation failure, and is good in economy, low in construction cost and convenient for engineering application.

Description

Practical direct-current continuous commutation failure suppression device and method based on phase modulator and stability system
Technical Field
The invention relates to the technical field of power systems, in particular to a practical direct-current continuous commutation failure suppression device and method based on a phase modulator and a stability system.
Background
With continuous establishment and production of direct current engineering in China, the problem of 'strong and weak intersection' of power grid companies is increasingly highlighted, and higher requirements are put forward on dynamic reactive power support of power grids. Therefore, a national grid company builds a batch of large phase modulators in an extra-high voltage converter station to improve the voltage stability level of a system and reduce the occurrence probability of direct current continuous commutation failure. However, the current phase modulator in the converter station is used for generator-end voltage following control, and the capability of supporting the failure of direct current continuous phase conversion by reactive power output is not considered. "study of multi-target reactive voltage coordination control system based on new generation phase modulators, sheath, shore army, etc., electric network technology, 2019" mainly aims at the control scheme of the phase modulators under the steady-state working condition, and does not relate to the suppression of the phase modulators on the direct current continuous phase commutation failure; "the phase modulation machine emergency control for inhibiting the direct current continuous commutation failure, Limega Wei, Wu Xuelian, etc., the electric power system is automatic, 2018" needs to establish a phase modulation machine emergency control substation and an emergency control system to inhibit the direct current from generating the continuous commutation failure probability, but the construction cost is large.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a practical direct current continuous commutation failure suppression device and a practical direct current continuous commutation failure suppression method based on a phase modulator and a stability system, on one hand, the direct current commutation failure condition is directly judged by adding criteria through a phase modulator control system; on the other hand, aiming at the condition that the phase modulation machine on-site criterion is difficult to accurately judge direct current commutation failure caused by some far-end faults, the direct current commutation failure is accurately judged through a direct current control protection and security system and an AVC system.
In order to achieve the above object, according to one aspect of the present invention, there is provided a practical dc continuous commutation failure suppression apparatus based on a phase modulator and a stability system, comprising a phase modulator, a phase modulator control system, and a dc protection control system;
the phase modulator is used for acquiring direct current bus voltage and direct current information from a direct current bus and sending the direct current information to the phase modulator control system;
the phase modulator control system is used for judging whether phase commutation failure occurs to direct current according to direct current bus voltage and direct current information input by the phase modulator, if so, the phase modulator control system controls the phase modulator to enter a forced excitation state, otherwise, the phase modulator control system judges whether a direct current phase commutation failure signal sent by the direct current control protection system is received, and if so, the phase modulator control system controls the phase modulator to enter the forced excitation state.
Further comprises a security device and an AVC system, wherein the security device is respectively connected with the direct current control and protection system and the AVC system,
the direct current protection system is used for judging whether the direct current has the commutation failure according to an internal commutation failure prediction module, and if the direct current has the commutation failure, sending a direct current commutation failure signal to the stability device;
the safety device is used for transmitting the direct current commutation failure signal to an AVC system;
and the AVC system is used for sending the direct-current commutation failure signal transmitted by the stabilizing device to the phase modulator control system.
Furthermore, the safety and stability device is connected with the direct current control and protection system through optical fiber communication, and the safety and stability device is connected with the AVC system through 4-20 mA analog quantity.
Further, the phase modulator control system comprises an on-site module, and the on-site module judges whether phase commutation failure occurs under the conditions of phase-to-phase fault and single-phase ground fault of the alternating current system according to the obtained direct current bus voltage and direct current information and according to the formulas (1) and (2):
wherein, the interphase fault criterion is shown as formula (1):
Figure GDA0002783903900000021
the single-phase earth fault criterion is shown as the formula (2):
Figure GDA0002783903900000022
wherein, U represents the acquired AC bus voltage value; u shapeminIndicating a direct current commutation failure critical value; i isdcRepresents the direct current of the inversion side; xCRepresenting a commutation reactance; gamma ray0Represents the minimum shut-off angle, typically 7 °; beta is a1Triggering a lead angle; u shape1The rated voltage value of the direct current bus is shown, alpha is a trigger delay angle, gamma is a turn-off angle,
Figure GDA0002783903900000031
is the phase offset angle of the commutation zero crossing.
Furthermore, the phase modulator control system is also used for controlling the phase modulator to exit the forced excitation state if the direct-current bus is recovered and the direct-current commutation failure signal is not received after the phase modulator enters the forced excitation state.
Furthermore, the phase modulator control system is also used for controlling the phase modulator to exit the forced excitation state when the direct current is judged not to have the phase commutation failure and a direct current phase commutation failure signal sent by the direct current control protection system is not received.
In order to achieve the above object, according to another aspect of the present invention, a practical dc continuous commutation failure suppression method based on a phase modulator and a stabilizing system includes the following steps:
step S11, the phase modulator obtains the DC bus voltage and the DC current information from the DC bus and sends the DC bus voltage and the DC current information to the phase modulator control system;
step S12, the phase modulation control system judges whether the phase commutation failure occurs to the direct current according to the direct current bus voltage and the direct current information input by the phase modulation, if so, the step S14 is executed, otherwise, the step S13 is executed;
step S13, the phase modulation control system judges whether a direct current commutation failure signal sent by the direct current protection system is received, if so, the step S14 is executed;
and step S14, the phase modulator control system controls the phase modulator to enter a forced excitation state.
Further, step S14 is followed by:
step S15, the phase modulation control system judges that the direct current bus is recovered and does not receive the direct current commutation failure signal, if the judgment result is yes, the step S16 is executed, otherwise, the step S14 is executed;
when it is determined in step S13 that the dc commutation failure message sent by the dc protection system is not received, step S16 is executed;
and step S16, the phase modulator control system controls the phase modulator to exit the forced excitation state.
Further, in step S13, the dc protection system determines whether the commutation failure occurs in the dc according to its internal commutation failure prediction module, and if it determines that the commutation failure occurs in the dc, sends a dc commutation failure signal to the safety device, and the safety device connects the dc protection system with the AVC system in communication, and sends the dc commutation failure signal to the AVC system, and the AVC system sends the dc commutation failure signal to the phase modulator control system.
Further, in step S12, the phase modulation control system determining whether the phase commutation failure occurs in the dc according to the dc bus voltage and the dc current information input by the phase modulation machine specifically includes:
the phase modulator control system comprises an on-site module, and the on-site module judges whether phase commutation failure occurs to direct current under the conditions of phase-to-phase fault and single-phase grounding fault of an alternating current system according to the obtained direct current bus voltage and direct current information and according to the formulas (1) and (2).
Wherein, the interphase fault criterion is shown as formula (1):
Figure GDA0002783903900000041
the single-phase earth fault criterion is shown as the formula (2):
Figure GDA0002783903900000042
wherein, U represents the collected AC bus voltage value; u shapeminIndicating a direct current commutation failure critical value; i isdcRepresents the direct current of the inversion side; xCRepresenting a commutation reactance; gamma ray0Represents the minimum shut-off angle, typically 7 °; beta is a1Triggering a lead angle; u shape1The rated voltage value of the direct current bus is shown, alpha is a trigger delay angle, gamma is a turn-off angle,
Figure GDA0002783903900000043
is the phase offset angle of the commutation zero crossing.
The phase modulator judges whether the direct current has failed in phase commutation through the phase modulator control system to realize quick forced excitation, and meanwhile, the direct current control protection and security system, the AVC system and the phase modulator control system ensure that the direct current fails in phase commutation and cannot be missed, so that the direct current fails in phase commutation can be accurately judged, reactive power is generated by the forced excitation, and the problem of direct current continuous phase commutation failure caused by partial alternating current power grid faults is solved; in addition, the scheme only needs to add a 4-20 mA channel between the existing stability system and the AVC system, and is simple to implement, good in economical efficiency and convenient for engineering application.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of one embodiment of a practical direct current continuous commutation failure suppression device based on a phase modulator and a stabilizing system;
FIG. 2 is a schematic flow chart of one embodiment of a practical method for suppressing the continuous commutation failure of DC based on a phase modulator and a stabilizing system according to the present invention;
FIG. 3 is a schematic flow chart of another embodiment of the practical DC continuous commutation failure suppression method based on the phase modulator and the stabilizing system of the present invention;
fig. 4 is a diagram illustrating the simulation effect of the method adopted in the embodiment of the present invention on the suppression effect of the dc continuous commutation failure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
As shown in fig. 1, one embodiment of the practical dc continuous commutation failure suppression apparatus based on a phase modulator and a stability system of the present invention includes a phase modulator 10, a phase modulator Control system 20, a dc Control and protection system 30, a stability apparatus 40, and an AVC (Automatic Voltage Control) system 50;
the phase modulator 10 is configured to obtain dc bus voltage and dc current information from a dc bus, and send the dc bus voltage and dc current information to the phase modulator control system 20;
the phase modulator control system 20 is configured to determine whether a phase commutation failure occurs in the direct current according to the direct current bus voltage and the direct current information input by the phase modulator 10, and after determining that the phase commutation failure occurs in the direct current, the phase modulator control system 20 controls the phase modulator 10 to enter a forced excitation state to emit large-capacity reactive power so as to reduce a risk of the direct current continuous phase commutation failure, that is, suppress a probability of the direct current continuous phase commutation failure; otherwise, judging whether a direct current commutation failure signal sent by the direct current protection system 30 is received, if so, controlling the phase modulator 10 to enter a forced excitation state by the phase modulator control system 20, otherwise, controlling the phase modulator 10 to exit the forced excitation state and recover to the running state before the forced excitation, namely, judging that the direct current commutation failure does not occur and the direct current commutation failure signal sent by the direct current protection system 30 is not received by the phase modulator control system 20.
After the phase modulator control system 20 controls the phase modulator 10 to enter the forced excitation state, if the dc bus is recovered and the dc commutation failure signal is not received, the phase modulator control system 20 controls the phase modulator 10 to exit the forced excitation state and recover to the pre-forced excitation operation state.
Specifically, the phase modulator control system 20 includes an on-site module, and the on-site module determines whether a phase commutation failure occurs in the case of a phase-to-phase fault and a single-phase ground fault of the ac system according to the formulas (1) and (2) based on the acquired dc bus voltage and dc current information.
Wherein, the interphase fault criterion is shown as formula (1):
Figure GDA0002783903900000061
the single-phase earth fault criterion is shown as the formula (2):
Figure GDA0002783903900000062
wherein, U represents the collected AC bus voltage value; u shapeminIndicating a direct current commutation failure critical value; i isdcRepresents the direct current of the inversion side; xCRepresenting a commutation reactance; gamma ray0Represents the minimum off angle, typically 7 °; beta is a1Triggering a lead angle; u shape1The rated voltage value of the direct current bus is represented, alpha is a trigger delay angle, gamma is a turn-off angle,
Figure GDA0002783903900000063
is the phase offset angle of the commutation zero crossing.
The dc protection system 30 is configured to determine whether a commutation failure occurs in the dc according to its internal commutation failure prediction module, and send a dc commutation failure signal to the stabilizing device 40 if it is determined that the commutation failure occurs in the dc.
And the stabilizing device 40 is used for transmitting the direct current commutation failure signal to an AVC system 50. The safety device 40 is connected with the direct current control and protection system 30 and the AVC system 50 respectively, wherein the safety device 40 is connected with the direct current control and protection system 30 through optical fiber communication, and the safety device 40 is connected with the AVC system 50 through 4-20 mA analog quantity, so that reliable rapid communication connection is established between the safety device 40 and the AVC system 50.
The direct current control protection system 30 can follow the requirements of national network company enterprise standard Q/GDW 11764 plus 2017 technical specification of high-voltage direct current engineering direct current control protection and stability control device interface, and transmits the direct current commutation failure signal to the safety device 40 in an optical fiber communication mode through an IEC 60044-8 communication protocol, and the safety device 40 is connected with the AVC system 50 through 4-20 mA analog quantity, so that the direct current commutation failure signal is transmitted to the AVC system 50.
And the AVC system 50 is used for sending the direct-current commutation failure signal transmitted by the stabilizing device 40 to an on-site module of the phase modulator control system 20. The AVC system 50 comprises a phase modulation AVC substation 51 and a phase modulation AVC master station 52, the phase modulation AVC substation 51 is in communication connection with the phase modulation AVC master station 52 through a scheduling data network, the phase modulation AVC substation 51 receives scheduling and control of the phase modulation AVC master station 52, and transmission of the direct-current phase-commutation failure signal is implemented by the phase modulation AVC substation 51.
As shown in fig. 2, one embodiment of the practical dc continuous commutation failure suppression method based on the phase modulator and the stabilizing system of the present invention includes the following steps:
step S11, the phase modulator obtains the DC bus voltage and the DC current information from the DC bus and sends the DC bus voltage and the DC current information to the phase modulator control system;
step S12, the phase modulation control system judges whether the phase commutation failure occurs to the direct current according to the direct current bus voltage and the direct current information input by the phase modulation, if so, the step S14 is executed, otherwise, the step S13 is executed;
specifically, the phase modulator control system comprises an on-site module, and the on-site module judges whether phase commutation failure occurs under the conditions of phase-to-phase fault and single-phase grounding fault of the alternating current system according to the obtained direct current bus voltage and direct current information and the formulas (1) and (2).
Wherein, the interphase fault criterion is shown as formula (1):
Figure GDA0002783903900000071
the single-phase earth fault criterion is shown as the formula (2):
Figure GDA0002783903900000072
wherein, U represents the collected AC bus voltage value; u shapeminIndicating a direct current commutation failure critical value; i isdcRepresents the direct current of the inversion side; xCRepresenting a commutation reactance; gamma ray0Represents the minimum shut-off angle, typically 7 °; beta is a beta1To trigger lead angle; u shape1The rated voltage value of the direct current bus is shown, alpha is a trigger delay angle, gamma is a turn-off angle,
Figure GDA0002783903900000081
is the phase offset angle of the commutation zero crossing.
Step S13, the phase modulation control system judges whether a direct current commutation failure signal sent by the direct current protection system is received, if so, the step S14 is executed;
and the direct current protection system judges whether the direct current has commutation failure according to an internal commutation failure prediction module, and if the direct current has commutation failure, a direct current commutation failure signal is sent to the safety device. The safety device is used for connecting the direct current protection system with the AVC system in a communication mode, sending the direct current commutation failure signal to the AVC system, and sending the direct current commutation failure signal to the phase modulator control system by the AVC system.
And step S14, the phase modulator control system controls the phase modulator to enter a forced excitation state and emit high-capacity reactive power so as to reduce the risk of direct current continuous commutation failure, namely, the probability of direct current continuous commutation failure is inhibited.
Referring to fig. 3, in another embodiment, after step S14, the method further includes:
step S15, the phase modulation control system determines that the dc bus is recovered and the dc commutation failure signal is not received, if the determination result is yes, step S16 is executed, otherwise, step S14 is executed again.
When it is determined in step S13 that the signal of the dc commutation failure sent by the dc protection system is not received, step S16 is executed;
and step S16, the phase modulator control system controls the phase modulator to exit the forced excitation state.
Fig. 4 shows that the adoption of the scheme can reduce the occurrence probability of continuous phase commutation failure of direct current under partial fault conditions, wherein a solid line shows that under the condition of single-phase ground fault, 3 times of phase commutation failure of direct current without a phase modulator can be locked; the dotted line indicates that two commutation failures occur under the corresponding situation of phase modifier uncontrolled adaptation; the dotted line shows that only one commutation failure occurs after the control method of the scheme is adopted, and the situation that continuous commutation failure does not occur.
The practical direct-current continuous commutation failure suppression device and method based on the phase modulator and the safety system, which are provided by the embodiment of the invention, aim at the problems that the current phase modulator is controlled by the follow voltage and the direct-current commutation failure cannot be accurately judged and the investment cost for establishing the phase modulator emergency control system is high, provide a practical method for suppressing the direct-current continuous commutation failure by considering the phase modulator and the safety system, realize the accurate judgment of the direct-current commutation failure by combining the in-place judgment and the judgment result of the direct-current control phase-commutation failure, further forcibly send out large-capacity reactive power and reduce the occurrence probability of the direct-current continuous commutation failure.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims (7)

1. A practical direct current continuous commutation failure suppression device based on a phase modulator and a stability system is characterized in that: the system comprises a phase modulator, a phase modulator control system and a direct current control and protection system;
the phase modulator is used for acquiring direct current bus voltage and direct current information from a direct current bus and sending the direct current information to the phase modulator control system;
the phase modulator control system is used for judging whether phase commutation failure occurs to direct current according to direct current bus voltage and direct current information input by the phase modulator, if so, the phase modulator control system controls the phase modulator to enter a forced excitation state, otherwise, the phase modulator control system judges whether a direct current phase commutation failure signal sent by the direct current control protection system is received, and if so, the phase modulator control system controls the phase modulator to enter the forced excitation state;
the device also comprises a safety and stability device and an AVC system, wherein the safety and stability device is respectively connected with the direct current control and protection system and the AVC system,
the direct current protection system is used for judging whether the direct current has commutation failure according to an internal commutation failure prediction module of the direct current protection system, and if the direct current has commutation failure, sending a direct current commutation failure signal to the safety device;
the safety device is used for transmitting the direct current commutation failure signal to an AVC system;
the AVC system is used for sending the direct-current commutation failure signal transmitted by the stabilizing device to the phase modulator control system;
the phase modulator control system comprises an on-site module, and the on-site module judges whether phase commutation failure occurs to direct current under the conditions of phase-to-phase fault and single-phase grounding fault of an alternating current system according to the obtained direct current bus voltage and direct current information and according to the formula (1) and the formula (2):
the interphase fault criterion is shown as the formula (1):
Figure FDA0003655079530000011
the single-phase earth fault criterion is shown as the formula (2):
Figure FDA0003655079530000012
wherein, U represents the collected AC bus voltage value; u shapeminIndicating a direct current commutation failure critical value; i isdcRepresents the direct current of the inversion side; xCRepresenting a commutation reactance; gamma ray0Represents the minimum shut-off angle, typically 7 °; beta is a1To trigger lead angle; u shape1Expressing the rated voltage value of the direct current bus, alpha is a trigger delay angle, and gamma is a turn-off angle，
Figure FDA0003655079530000021
Is the phase offset angle of the commutation zero crossing.
2. The practical dc continuous commutation failure suppression apparatus based on a phase modulator and a stabilizing system as claimed in claim 1, wherein: the safety and stability device is connected with the direct current control and protection system through optical fiber communication, and the safety and stability device is connected with the AVC system through 4-20 mA analog quantity.
3. The practical dc continuous commutation failure suppression apparatus based on a phase modulator and a stabilizing system as claimed in claim 1, wherein: and the phase modulator control system is also used for controlling the phase modulator to exit the forced excitation state if the direct-current bus is recovered and a direct-current commutation failure signal is not received after the phase modulator enters the forced excitation state.
4. The practical dc continuous commutation failure suppression apparatus based on a phase modulator and a stabilizing system as claimed in claim 1, wherein: and the phase modulator control system is also used for controlling the phase modulator to exit the forced excitation state when judging that the direct current has not failed in phase commutation and does not receive a direct current phase commutation failure signal sent by the direct current control protection system.
5. A practical direct current continuous commutation failure suppression method based on a phase modulator and a stability system is characterized by comprising the following steps: the method comprises the following steps:
step S11, the phase modulator obtains the DC bus voltage and the DC current information from the DC bus and sends the DC bus voltage and the DC current information to the phase modulator control system;
step S12, the phase modulation control system judges whether the phase commutation failure occurs to the direct current according to the direct current bus voltage and the direct current information input by the phase modulation, if so, the step S14 is executed, otherwise, the step S13 is executed;
step S13, the phase modulation control system judges whether a direct current commutation failure signal sent by the direct current protection system is received, if so, the step S14 is executed;
step S14, the phase modulator control system controls the phase modulator to enter a forced excitation state;
in step S12, the phase modulation control system determines whether a phase commutation failure occurs in the dc according to the dc bus voltage and the dc current information input by the phase modulation machine, specifically:
the phase modulator control system comprises an on-site module, and the on-site module judges whether phase commutation failure occurs under the conditions of phase-to-phase fault and single-phase ground fault of an alternating current system according to the obtained direct current bus voltage and direct current information and the formulas (1) and (2);
the interphase fault criterion is shown as the formula (1):
Figure FDA0003655079530000031
the single-phase earth fault criterion is shown as the formula (2):
Figure FDA0003655079530000032
wherein, U represents the collected AC bus voltage value; u shapeminIndicating a direct current commutation failure critical value; i isdcRepresents the direct current of the inversion side; xCRepresenting a commutation reactance; gamma ray0Represents the minimum shut-off angle, typically 7 °; beta is a1Triggering a lead angle; u shape1The rated voltage value of the direct current bus is shown, alpha is a trigger delay angle, gamma is a turn-off angle,
Figure FDA0003655079530000033
is the phase offset angle of the commutation zero crossing.
6. The practical direct-current continuous commutation failure suppression method based on the phase modulator and the stabilizing system as claimed in claim 5, wherein: step S14 is followed by:
step S15, the phase modulation control system judges that the direct current bus is recovered and does not receive the direct current commutation failure signal, if the judgment result is yes, the step S16 is executed, otherwise, the step S14 is executed;
when it is determined in step S13 that the signal of the dc commutation failure sent by the dc protection system is not received, step S16 is executed;
and step S16, the phase modulator control system controls the phase modulator to exit the forced excitation state.
7. The practical direct-current continuous commutation failure suppression method based on the phase modulator and the stable system as claimed in claim 5, wherein: in step S13, the dc protection system determines whether the commutation failure occurs in the dc according to its internal commutation failure prediction module, and if it determines that the commutation failure occurs in the dc, sends a dc commutation failure signal to the stabilizing device, and the stabilizing device connects the dc protection system with the AVC system in a communication manner, and sends the dc commutation failure signal to the AVC system, and the AVC system sends the dc commutation failure signal to the phase modulation control system.
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