CN110556813B - High-reliability operation mode switching method for direct-current power distribution system - Google Patents
High-reliability operation mode switching method for direct-current power distribution system Download PDFInfo
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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
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- 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]
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Abstract
The invention provides a high-reliability operation mode switching method of a direct-current power distribution system. The method realizes the rapid smooth switching of the operation modes of the controllable devices in the direct current power distribution system so as to meet the current topological structure or operation state of the system, improves the power supply reliability of the load in the direct current power distribution system, and ensures the long-term stable operation of the direct current power distribution system.
Description
Technical Field
The invention relates to the technical field of electric power, in particular to a high-reliability operation mode switching method of a direct-current power distribution system.
Background
In contrast to the concept of an ac distribution network, there is also a dc distribution network. The direct-current power distribution network is provided with a direct-current bus, and the direct-current load can be directly supplied by the direct-current bus; and the alternating current load needs to be supplied with power after passing through the inverter device. Dc distribution would be of great advantage if the dc load proportion in the load was large. Compared with an alternating-current power distribution network, the direct-current power distribution network has the advantages of small line loss, high reliability, no need of phase frequency control and strong capacity of receiving distributed power sources.
With the wide application of dc power distribution technology, research on dc power distribution systems is also becoming more and more intensive. The direct current distribution system exchanges energy with the alternating current distribution system through the converter, so that the voltage source converters at all ports in the direct current system can supply power to the system, and the rest voltage source converters can maintain the normal operation of the direct current system when one or two of the voltage source converters are in withdrawal operation. Wherein the voltage source converter (voltage source converter, VSC for short) is a converter consisting of devices with a shutdown capability. Line breaks in the dc distribution system and some controllable devices are out of operation may cause changes in the mode of operation. If the dc power distribution system cannot switch the operation modes rapidly, accurately and reliably, damage to the power electronic devices may occur, and even the entire dc power distribution system cannot work normally.
Disclosure of Invention
In order to solve the problem of switching the running mode of the direct current power distribution system in the prior art, the invention provides a high-reliability running mode switching method of the direct current power distribution system.
A high-reliability operation mode switching method of a direct current power distribution system comprises the following steps:
dividing the running mode of the direct current power distribution system into a three-terminal power supply mode, a double-terminal isolation mode, a double-terminal power supply mode, a single-terminal power supply mode and a STATCOM mode;
the direct current power distribution system is switched freely among different operation modes according to the change of the topological structure.
Further, the direct current power distribution system freely switches between different operation modes, including:
the direct current distribution system in the three-terminal power supply mode has a T-junction fault, the direct current distribution system is automatically switched to a double-terminal isolation mode, or the T-junction fault in the direct current distribution system is recovered, and the direct current distribution system is automatically switched back to the three-terminal power supply mode from the double-terminal isolation mode; and/or
Any one voltage source converter in the direct current distribution system in the three-terminal power supply mode is out of operation, other voltage source converters work normally, the operation mode of the direct current distribution system is automatically switched to a double-terminal power supply mode, or the voltage source converter in the direct current distribution system out of operation is restored to be in operation, and the direct current distribution system is automatically switched back to the three-terminal power supply mode from the double-terminal power supply mode; and/or
Any two voltage source converters in the direct current distribution system in the three-terminal power supply mode are out of operation, only one voltage source converter is left to work normally, the direct current distribution system is automatically switched to a single-terminal power supply mode, or all the two voltage source converters out of operation in the direct current distribution system are restored to be in operation, and the direct current distribution system is automatically switched back to the three-terminal power supply mode from the single-terminal power supply mode; and/or
The direct current power distribution system in the three-terminal power supply mode is disconnected from the distribution network or is stopped, the direct current power distribution system is automatically switched to a STATCOM mode, or any one voltage source converter in the direct current power distribution system is restored to operate and drives other voltage source converters to resume normal operation, and the direct current power distribution system is automatically switched back to the three-terminal power supply mode from the STATCOM mode; and/or
The direct current distribution system in the double-end isolation mode has a non-T wiring fault, the direct current distribution system is automatically switched to a single-end power supply mode, or the non-T wiring fault in the direct current distribution system is recovered, and the direct current distribution system is automatically switched back to the double-end isolation mode from the single-end power supply mode; and/or
The direct current circuit in the direct current power distribution system in the double-end isolation mode is disconnected, the direct current power distribution system is automatically switched into a STATCOM mode, or the direct current circuit in the direct current power distribution system is reclosed, and the direct current power distribution system is automatically switched back to the double-end isolation mode from the STATCOM mode; and/or
Any one of the two voltage source converters which are in the double-ended power supply mode and normally work in the direct current distribution system is out of operation, the direct current distribution system is automatically switched to a single-ended power supply mode, or any one of the two voltage source converters which are in the direct current distribution system and out of operation is restored to be in operation, and the direct current distribution system is automatically switched back to the double-ended power supply mode from the single-ended power supply mode; and/or
And the direct current distribution system in the single-ended power supply mode has power supply cable faults, the direct current distribution system is automatically switched to a STATCOM mode, or the power supply cable faults in the direct current distribution system are recovered, and the direct current distribution system is automatically switched back to the single-ended isolation mode from the STATCOM mode.
Further, the operation mode division of the direct current power distribution system includes:
the topological structure change of the direct current distribution system causes the control mode of the power electronic equipment to be switched;
and dividing the running mode of the direct current power distribution system according to the switching condition of the control modes of the power electronic equipment.
Further, the dc power distribution system topology change includes: and one or more of direct current line disconnection and recovery, single voltage source converter out-of-operation and recovery operation, and voltage source converter alternating current side fault and fault recovery.
The invention firstly divides the running mode of the direct current distribution system into five modes of three-terminal power supply mode, two-terminal isolation mode, two-terminal power supply mode, single-terminal power supply mode and STATCOM mode, and then the system is freely switched among the five running modes according to the change of the topological structure. The invention realizes the rapid smooth switching of the operation modes of the controllable devices in the direct current distribution system so as to meet the current topological structure or operation state of the system, improves the power supply reliability of the load in the direct current distribution system, and further ensures the long-term stable operation of the direct current distribution system. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a dc power distribution system according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a switching relationship of an operation mode of a dc power distribution system according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 shows a schematic structural diagram of a dc power distribution system according to an embodiment of the present invention. As shown, the DC distribution system includes three DC buses (first DC bus DC1, second DC bus DC2, third DC bus DC 3), three voltage source converters (first voltage source converter VSC1, second voltage source converter VSC2, third voltage source converter VSC 3), and a three-terminal AC distribution system (first AC distribution system AC1, second AC distribution system AC2, third AC distribution system AC 3). Wherein the first direct current bus DC1 is connected to a first alternating current distribution system AC1 by means of a first voltage source converter VSC 1. The second direct current bus DC2 and the third direct current bus DC3 are connected with the second alternating current distribution system AC2 and the third alternating current distribution system AC3 sequentially through the second voltage source converter VSC2 and the third voltage source converter VSC3, wherein the connection structure of the second direct current bus DC1 is the same as that of the first direct current bus DC 1; meanwhile, the three direct current buses are provided with direct current breakers, a first direct current bus DC1 is provided with a first direct current breaker DCB1, a second direct current bus DC2 is provided with a second direct current breaker DCB2, and a third direct current bus DC3 is provided with a third direct current breaker DCB3; the three voltage source converters are provided with direct current breakers on one side connected with the direct current buses, alternating current breakers are arranged on one side connected with the alternating current distribution system, direct current breakers DCB4 are arranged on one end, connected with the first direct current buses DC1, of the first voltage source converter VSC1, and alternating current breakers ACB1 are arranged on one end, connected with the first alternating current distribution system AC1, of the first voltage source converter VSC 1. Similar to the structure of the two ends of the first voltage source converter VSC1, the two ends of the second voltage source converter VSC2 are connected with a direct current breaker DCB5 and an alternating current breaker ACB2, and the two ends of the third voltage source converter VSC3 are connected with a direct current breaker DCB6 and an alternating current breaker ACB3. It should be noted that the present invention is exemplified by a dc breaker and an ac breaker, but is not limited to the dc breaker and the ac breaker, and any device capable of realizing the circuit breaking protection may be used in the present invention, for example: a dc switching component, an ac switching component, etc.
Based on the connection structure of the direct current distribution system, the direct current distribution system is connected with three alternating current distribution systems in a ground mode, and the three-terminal alternating current distribution system can supply power to the direct current distribution system through a voltage source converter connected with the three-terminal alternating current distribution system; meanwhile, when one or more voltage source converters are out of operation or have faults, the rest voltage source converters maintain the normal operation of the direct current distribution system, so that the long-term stable operation of the direct current distribution system is ensured. Preferably, in the dc power distribution system according to the embodiment of the present invention, power electronic devices with bidirectional current capability are selected as components in the system, for example: the voltage source converter, the direct current breaker, the alternating current breaker and the like with the bidirectional current capacity enable the system to automatically adapt to forward or reverse power flow when the operation mode changes, namely the system has the self-adaptive function of bidirectional power flow.
Fig. 2 is a schematic diagram illustrating a switching relationship of an operation mode of a dc power distribution system according to an embodiment of the present invention. As shown in the figure, on the basis of the dc power distribution system, the method for switching the operation mode of the dc power distribution system in the embodiment of the present invention firstly divides the operation mode of the dc power distribution system into five modes, i.e., three-terminal power supply mode, two-terminal isolation mode, two-terminal power supply mode, single-terminal power supply mode and STATCOM mode (Static Synchronous Compensator, i.e., static synchronous compensation mode); the system is then free to switch between the five modes of operation according to the topology changes.
The principle of dividing the running mode of the direct current power distribution system is mainly based on the switching condition of the control mode of the ground power electronic equipment caused by the topological structure change of the direct current power distribution system. The power direction in the system is not used as a judging standard of an operation mode, and the control mode of each power electronic device is not influenced by the power direction because the system has a self-adaptive function of power bidirectional flow. The system topology includes: and D.C. line disconnection and recovery, single voltage source converter quit operation and recovery operation or voltage source converter AC side fault and fault recovery. According to the operation mode division principle, the topology structure change of the direct current power distribution system can enable the system to have the following 5 operation modes: three-terminal power mode, two-terminal isolation mode, single-terminal power mode, and STATCOM mode. The three-terminal power supply mode is that all power electronic equipment in the direct-current power distribution system normally works and has good connection relation, and the direct-current power distribution system and the three alternating-current power distribution systems normally supply power; the double-end power supply mode is that one alternating-current power distribution system is out of operation, and normal power supply is performed between the direct-current power distribution system and the other two alternating-current power distribution systems; the single-ended power supply mode is that two alternating-current power distribution systems are out of operation, and the direct-current power distribution systems only normally supply power with the rest alternating-current power distribution systems; the double-end isolation mode is based on the fact that when the system is in a three-terminal power supply mode, a T wiring circuit fault occurs or a direct current breaker on the T wiring circuit needs to be overhauled, and other two alternating current power distribution systems supply power through the direct current power distribution systems. The T-connection line refers to a line which is indirectly connected from a line for supplying power to a second party from a first party and supplies power to a third party, and the T-connection line is exemplified by a third direct current bus DC3 shown in fig. 1; the STATCOM mode of the system is equivalent to a controllable reactive power supply, the reactive current of the reactive power supply can quickly change along with the change of the reactive current of the load, the reactive power required by the system is automatically compensated, and dynamic reactive compensation is realized on the reactive power of the direct-current distribution system.
After the operation modes of the direct current power distribution system are divided, the system is freely switched among the five operation modes according to the topological structure change of the system so as to meet the changed topological structure of the system. The free switching mode among the five operation modes is as follows:
when the direct current power distribution system works normally, the system is in a three-terminal power supply mode when power is supplied normally between the system and three alternating current power distribution systems AC1, AC2 and AC 3. When a direct current distribution system keeps a three-terminal power supply mode, and a T wiring DC3 in the system fails and a direct current breaker DCB3 on the T wiring DC3 needs to be overhauled, a third voltage source converter VSC stops working, a first voltage source converter VSC1 and a second voltage source converter VSC2 still normally operate, and the operation mode of the system is automatically switched from the three-terminal power supply mode to a double-terminal isolation mode, namely, normal power supply is carried out between the first alternating current distribution system AC1 and the second alternating current distribution system AC2 and the direct current distribution system; or when the T-junction fault is recovered, the three alternating current distribution systems AC1, AC2 and AC3 and the system are powered normally, and then the system is automatically switched back to the three-terminal power supply mode from the double-terminal isolation mode.
When a direct current distribution system is in a three-terminal power supply mode, any one voltage source converter in the system is out of operation, other voltage source converters work normally, and the operation mode of the system is automatically switched into a two-terminal power supply mode; or when the system is in the double-end power supply mode, the voltage source converter which is out of operation in the system is restored to be in operation, and the system is automatically switched into the three-end power supply mode.
When the system is in a three-terminal power supply mode, any two voltage source converters in the system are out of operation, only one voltage source converter is left to normally work, and the operation mode of the system is directly switched from the three-terminal power supply mode to a single-terminal power supply mode; or when the system is in the single-end power supply mode, all the two voltage source converters which are out of operation in the system are restored to be in operation, and the system is directly switched back to the three-end power supply mode.
When the distribution network of the system in the three-terminal power supply mode is disconnected or the distribution network is stopped, the system is disconnected from the three alternating current power distribution systems AC1, AC2 and AC3, and the system is automatically switched to a STATCOM mode; or when any one of the voltage source converters in the system resumes operation and drives the other voltage source converters to resume normal operation, the system resumes connection with the three alternating current distribution systems AC1, AC2 and AC3, and the system is automatically switched back to the three-terminal power supply mode from the STATCOM mode.
When a dc power distribution system is in a double-ended isolation mode, if a non-T wiring fault occurs in the system again, for example: the second direct current bus DC2 has a non-T wiring fault, only the first alternating current distribution system AC1 and the system normally supply power, and the system is automatically switched into a single-ended power supply mode; or when the non-T wiring fault is recovered, the first alternating current distribution system AC1 and the system are normally powered, the second alternating current distribution system AC2 and the system are recovered to be powered, the third alternating current distribution system AC3 and the system are disconnected, and the system is automatically switched back to the double-end isolation mode from the single-end power supply mode.
When the system is in the double-ended isolation mode, if the first direct current bus DC1 and the second direct current bus DC2 are disconnected, namely the first alternating current power distribution system AC1, the second alternating current power distribution system AC2 and the third alternating current power distribution DC3 are disconnected with the system, the system is switched into a STATCOM mode; or when the two direct current buses reclose, the system switches from the STATCOM mode back to the double-end isolation mode.
When the system is in a double-end power supply mode, any one of the two voltage source converters which normally work in the system is taken out of operation, namely only one voltage source converter which normally works, and the system is automatically switched from the double-end power supply mode to a single-end power supply mode; or when the system is in the single-ended power supply mode, any one of the two voltage source converters which are out of operation in the system is recovered to operate, namely, at the moment, the two voltage source converters normally work, and the system is automatically switched into the double-ended power supply mode.
When the direct current power distribution system is in a single-ended power supply mode, if the system power supply cable fails, for example: when normal power supply is left between the first alternating current power distribution system AC1 and the system, then the first direct current bus DC1 has cable fault, the first alternating current power distribution system AC1 is disconnected from the system, and the system is automatically switched into a STATCOM mode; or when the cable fault of the first direct current bus DC1 is recovered, the first alternating current distribution system AC1 and the system recover power supply, and the second alternating current distribution system AC2 and the third alternating current distribution system AC3 and the system still cannot supply power, the system is automatically switched from the STATCOM mode to the single-end power supply mode.
The embodiment of the invention firstly divides the running mode of the direct current power distribution system into five running modes of a three-terminal power supply mode, a double-terminal isolation mode, a double-terminal power supply mode, a single-terminal power supply mode and a STATCOM mode, and then the system is freely switched among the five running modes according to the change of a topological structure. The embodiment of the invention realizes that each controllable device in the direct current distribution system is rapidly and smoothly switched in an operation mode so as to meet the current topological structure or operation state of the system, improves the power supply reliability of the load in the direct current distribution system, and further ensures the long-term stable operation of the direct current distribution system.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (2)
1. The switching method for the high-reliability operation mode of the direct-current power distribution system is characterized by comprising the following steps of:
dividing the running mode of the direct current power distribution system into a three-terminal power supply mode, a double-terminal isolation mode, a double-terminal power supply mode, a single-terminal power supply mode and a STATCOM mode;
the direct current power distribution system is freely switched among different operation modes according to the topological structure change, and the topological structure change of the direct current power distribution system comprises: the direct current line is disconnected and recovered, and the single voltage source converter is withdrawn from operation and recovered, and one or more of the fault and fault recovery of the alternating current side of the voltage source converter are carried out;
the direct current power distribution system freely switches between different operation modes, and comprises:
the direct current distribution system in the three-terminal power supply mode has a T-junction fault, the direct current distribution system is automatically switched to a double-terminal isolation mode, or the T-junction fault in the direct current distribution system is recovered, and the direct current distribution system is automatically switched back to the three-terminal power supply mode from the double-terminal isolation mode;
any one voltage source converter in the direct current distribution system in the three-terminal power supply mode is out of operation, other voltage source converters work normally, the operation mode of the direct current distribution system is automatically switched to a double-terminal power supply mode, or the voltage source converter in the direct current distribution system out of operation is restored to be in operation, and the direct current distribution system is automatically switched back to the three-terminal power supply mode from the double-terminal power supply mode;
any two voltage source converters in the direct current distribution system in the three-terminal power supply mode are out of operation, only one voltage source converter is left to work normally, the direct current distribution system is automatically switched to a single-terminal power supply mode, or all the two voltage source converters out of operation in the direct current distribution system are restored to be in operation, and the direct current distribution system is automatically switched back to the three-terminal power supply mode from the single-terminal power supply mode;
the direct current power distribution system in the three-terminal power supply mode is disconnected from the distribution network or is stopped, the direct current power distribution system is automatically switched to a STATCOM mode, or any one voltage source converter in the direct current power distribution system is restored to operate and drives other voltage source converters to resume normal operation, and the direct current power distribution system is automatically switched back to the three-terminal power supply mode from the STATCOM mode;
the direct current distribution system in the double-end isolation mode has a non-T wiring fault, the direct current distribution system is automatically switched to a single-end power supply mode, or the non-T wiring fault in the direct current distribution system is recovered, and the direct current distribution system is automatically switched back to the double-end isolation mode from the single-end power supply mode;
the direct current circuit in the direct current power distribution system in the double-end isolation mode is disconnected, the direct current power distribution system is automatically switched into a STATCOM mode, or the direct current circuit in the direct current power distribution system is reclosed, and the direct current power distribution system is automatically switched back to the double-end isolation mode from the STATCOM mode;
any one of the two voltage source converters which are in the double-ended power supply mode and normally work in the direct current distribution system is out of operation, the direct current distribution system is automatically switched to a single-ended power supply mode, or any one of the two voltage source converters which are in the direct current distribution system and out of operation is restored to be in operation, and the direct current distribution system is automatically switched back to the double-ended power supply mode from the single-ended power supply mode;
and the direct current distribution system in the single-ended power supply mode has power supply cable faults, the direct current distribution system is automatically switched to a STATCOM mode, or the power supply cable faults in the direct current distribution system are recovered, and the direct current distribution system is automatically switched back to the single-ended power supply mode from the STATCOM mode.
2. The switching method according to claim 1, wherein the operation mode division of the direct current power distribution system includes:
the topological structure change of the direct current distribution system causes the control mode of the power electronic equipment to be switched;
and dividing the running mode of the direct current power distribution system according to the switching condition of the control modes of the power electronic equipment.
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| CN108199422A (en) * | 2018-01-26 | 2018-06-22 | 南京工程学院 | A kind of operational mode switching system based on both ends flexible direct current power distribution network |
| CN108539776B (en) * | 2018-05-10 | 2021-05-07 | 国网江苏省电力有限公司徐州供电分公司 | Coordination control method for low-voltage flexible distribution network power supply system |
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