CN110620375A - High-reliability shutdown method for direct-current power distribution system - Google Patents
High-reliability shutdown method for direct-current power distribution system Download PDFInfo
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- CN110620375A CN110620375A CN201910785942.8A CN201910785942A CN110620375A CN 110620375 A CN110620375 A CN 110620375A CN 201910785942 A CN201910785942 A CN 201910785942A CN 110620375 A CN110620375 A CN 110620375A
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004146 energy storage Methods 0.000 claims abstract description 34
- 238000005286 illumination Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 239000010687 lubricating oil Substances 0.000 claims description 3
- 239000003921 oil Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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Classifications
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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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Abstract
The invention discloses a high-reliability shutdown method for a direct-current power distribution system. The method comprises the following steps: cutting off the load; cutting off the distributed power supply; if the energy storage device exists, cutting off the energy storage device, and if the energy storage device does not exist, entering the next operation; stopping operation to fix the active power converter station; and stopping the operation of the fixed direct-current voltage converter station. The method is suitable for controlling the direct current power distribution system, the direct current voltage converter is shut down according to the controllable degree by means of firstly cutting off the load and finally shutting down the direct current voltage converter, the shutdown is performed sequentially and progressively, the method is standard and fast, the stability of the whole system can be effectively guaranteed, and the safety of the system is improved.
Description
Technical Field
The invention belongs to the field of electronic power distribution control, and particularly relates to a high-reliability shutdown method for a direct-current power distribution system.
Background
Compared with an alternating current distribution system, the direct current distribution system provides a direct current bus for a load, the direct current load can be directly supplied with power by the direct current bus, the alternating current load needs to be supplied with power after passing through the inverter device, and if the proportion of the direct current load in the load is large, the direct current distribution system has great advantages.
In recent years, the high-voltage direct-current transmission technology is gradually mature and widely applied to power systems, converters, circuit breakers and the like are developed more mature, a direct-current transmission system is more stable than an alternating-current transmission system, the stability problem of the alternating-current power grid can be fundamentally solved by constructing a large power grid in a direct-current mode, the reliability is high, phase-frequency control is not needed, and the capability of accepting distributed power supplies is high.
The shutdown of the direct current power distribution system means that the whole power distribution system is closed in a certain sequence, and when the traditional power distribution system is shut down, a certain normative sequence is absent, so that the stability is poor during the shutdown, and certain potential safety hazards exist.
Disclosure of Invention
In view of the above problems, the present invention provides a method for stopping a dc power distribution system with high reliability, the method comprising:
cutting off the load;
cutting off the distributed power supply;
if the energy storage device exists, cutting off the energy storage device, and if the energy storage device does not exist, entering the next operation;
stopping operation to fix the active power converter station;
and stopping the operation of the fixed direct-current voltage converter station.
Further, the air conditioner is provided with a fan,
the energy storage device comprises a super capacitor, a storage battery and the like, and is connected to a direct current bus through a converter, and the direct current bus provides electric energy stored by the energy storage device.
Further, the air conditioner is provided with a fan,
the load is a direct current load, the direct current load is connected into a direct current bus through a converter, and the direct current bus supplies power to the direct current load;
the direct current load comprises a regular direct current load, a short circuit direct current load and an accident direct current load.
Further, the air conditioner is provided with a fan,
the frequent direct current load is a load which is supplied with power uninterruptedly by a direct current power supply in an operating state;
the frequent direct current load comprises a direct current relay which is electrified frequently, a signal lamp, a position indicator, a direct current illuminating lamp which is lightened frequently, an inverter power supply which is put into operation frequently and the like.
Further, the air conditioner is provided with a fan,
the short-circuit direct current load is the short-time maximum current borne by the direct current power supply;
the short-circuit direct current load comprises a relay protection and automatic device operation loop, a tripping coil of a circuit breaker and the like.
Further, the air conditioner is provided with a fan,
the accident direct current load is a load which is powered by an alternating current power supply during normal operation and powered by a direct current power supply after the self-use alternating current power supply disappears;
the accident direct current load comprises accident illumination, a gasoline engine lubricating oil pump, a generator hydrogen-cooled sealing oil pump, a carrier communication power supply and the like.
Further, the air conditioner is provided with a fan,
the distributed power supply comprises one or more of a wind driven generator, a photovoltaic panel and a micro gas turbine, and is connected into a direct current bus through a converter to provide electric energy for the direct current bus.
Further, the air conditioner is provided with a fan,
the fixed active power converter station comprises unipolar power control, bipolar power control and unipolar current control.
Further, the air conditioner is provided with a fan,
the voltage of the constant direct current voltage converter station is controlled below a maximum limit value so as to ensure the stability of direct current voltage.
Further, the air conditioner is provided with a fan,
and the fixed direct-current voltage converter station and the fixed active power converter station are connected with a direct-current bus and an alternating-current bus.
The shutdown method firstly cuts off the load, finally shuts down the direct current voltage converter, and shuts down according to the controllable degree, so that the shutdown is progressive in sequence, standard and fast, the stability of the whole system can be effectively ensured, and the safety of the system is improved. 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 will 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 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 shows a schematic shutdown scheme according to an embodiment of the invention;
fig. 2 shows a block diagram of a dc power distribution system according to an embodiment of the invention.
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.
FIG. 1 shows a schematic flow chart of operations according to an embodiment of the present invention. As shown in fig. 1, a method for high reliability shutdown of a dc power distribution system includes the following steps:
the method comprises the following steps: cutting off the load;
step two: cutting off the distributed power supply;
step three: if the energy storage device exists, cutting off the energy storage device, and if the energy storage device does not exist, entering the next operation;
step four: stopping operation to fix the active power converter station;
step five: and stopping the operation of the fixed direct-current voltage converter station.
Specifically, the energy storage device comprises a super capacitor, a storage battery and the like; the energy storage device is connected to a direct current bus through a converter, and the direct current bus provides electric energy stored by the energy storage device.
For example, a storage battery is installed in a direct current power distribution system, and the charging and power supply mode of the system is to connect a converter and the storage battery and then supply power to relevant equipment; under the condition that the commercial power is normal, the converter supplies power to related equipment on one hand, and charges the storage battery on the other hand so as to supplement the electric quantity lost by partial discharge of the storage battery and ensure that the storage battery has sufficient electric quantity inside; under the working state, the storage battery also has a certain filtering function; when the commercial power is interrupted, the storage battery independently supplies power to the related equipment; because the storage battery is usually in a full charge state, when the commercial power is interrupted for a short time, the storage battery ensures uninterrupted power supply.
The energy storage device generally comprises a controller, a converter and a storage battery, and is controlled by the controller during energy storage, and electric energy is converted and stored in the storage battery; when the energy storage device is cut off in the process of stopping the direct current power distribution system, the controller is usually used for controlling the disconnection of the line, and after the line is disconnected, the transmitted current and voltage cannot be converted and stored in the storage battery, so that the purpose of cutting off the energy storage device is achieved.
The controllability of the energy storage device is high, and the system cannot store electric energy after the energy storage device is cut off.
Specifically, the load is a direct current load, the direct current load is connected to a direct current bus through a converter, and the direct current bus supplies power to the direct current load; the direct current load comprises a regular direct current load, a short circuit direct current load and an accident direct current load.
Specifically, the regular dc load is a load that is supplied with power uninterruptedly by a dc power supply in an operating state; the frequent DC load comprises a frequently electrified DC relay, a signal lamp and a position indicator; a dc illumination lamp that is often lit; an inverter power supply which is often put into operation; and the proportion of the constant load in the total direct current load is relatively small.
Specifically, the short-circuit dc load is a short-time maximum current borne by the dc power supply; the short-circuit direct current load comprises a relay protection and automatic device operation loop, a tripping coil of a circuit breaker and the like.
Specifically, the emergency dc load is a load supplied with power by an ac power supply during normal operation, and supplied with power by a dc power supply after the self-use ac power supply of the power plant and the substation disappears; the accident direct current load comprises accident illumination, a gasoline engine lubricating oil pump, a generator hydrogen-cooled sealing oil pump, a power supply for carrier communication and the like.
Illustratively, taking a direct current load of a substation as an example, relevant devices of the direct current load are all configured with corresponding switches, for example, a direct current lighting lamp and an emergency lighting lamp are all provided with switches connected thereto, so as to control the direct current lighting lamp and the emergency lighting lamp to be turned on or turned off; and meanwhile, a switch for controlling the whole current and voltage to be cut off is arranged in the whole transformer substation so as to cut off all loads at the same time, and the loads can be cut off through the main switch when the loads are cut off to stop the direct-current power distribution system.
The controllability of cutting off the direct current load is strong, and the direct current load is firstly cut off in the direct current power distribution system, so that the overall stability of the power distribution system is not damaged, and the safety performance is good.
Specifically, the distributed power supply comprises one or more of a wind driven generator, a photovoltaic panel and a micro gas turbine, and is connected into the direct current bus through an inverter to provide electric energy for the direct current bus.
For example, a wind power generator is taken as an example, wind power is used for driving a windmill blade to rotate, and then the rotating speed is increased through a speed increaser to promote the generator to generate electricity; when the distributed power supply is cut off, the control program on the wind driven generator can be used for controlling, so that the generator is in a stop state, and the cutting off of the distributed power supply can be realized.
Specifically, the fixed active power converter station includes unipolar power control, bipolar power control, and unipolar current control.
Specifically, the voltage of the fixed dc voltage converter station is controlled below a maximum limit value, so as to ensure the stability of the dc voltage.
Specifically, the fixed direct-current voltage converter station and the fixed active power converter station are both connected with a direct-current bus and an alternating-current bus.
When the current voltage is in the limit value, the current is converted by using the fixed direct-current voltage converter station, when the current voltage exceeds the limit value, the current is converted by using the fixed active power converter station, the fixed direct-current voltage converter station is used as a main part, the fixed active power converter station is used as an auxiliary part, the fixed direct-current voltage converter station and the active power converter station can work in a coordinated way, and the fixed direct-current voltage converter station and the active power converter station are used for converting the current in an auxiliary way, so that the.
One side of the converter station is connected with an alternating current system, and the other side of the converter station is connected with a direct current power network, and the converter station is a power engineering facility for realizing alternating current-direct current power conversion (alternating current-direct current conversion or direct current-alternating current conversion) in a direct current power distribution system.
The converter station mainly comprises a converter, a valve hall, a converter transformer, an alternating current switching plant, a smoothing reactor, a filter, reactive power compensation equipment and the like; the control of the converter station generally does not include equipment with control or protection functions such as a disconnecting switch, a circuit breaker, a transformer tap switch and the like, the occupied area of the converter station is large, the control is mainly monitored by a monitoring room, the monitoring room is mainly used for arranging and installing the monitoring and related equipment of the converter station and is used as an operator to carry out monitoring, operation and maintenance, a control simulation screen is generally arranged in a traditional direct current converter station control room, and a microcomputer work station can be generally arranged for monitoring due to the adoption of an advanced computer technology in the existing high-voltage direct current converter station; when the direct-current voltage converter station needs to be stopped, the microcomputer working station is directly operated to control the converter station to stop operation; specifically, when a converter in a fixed direct-current voltage converter station is started, a starting resistor is connected in series in a charging loop, uncontrolled rectification charging is carried out on the converter through the voltage of an alternating-current side system, when the voltage of a sub-module of the converter is approximately 0.7 time of the rated voltage, the pre-charging is completed, the converter is unlocked by the starting resistor at the same time, the converter is further charged through controlling the voltage converter, and the direct-current voltage is controlled to reach the rated value; when the power supply is shut down, the power supply can be directly cut off through control, so that the fixed direct-current voltage converter station does not work.
The fixed direct-current voltage converter station mainly ensures the stability of direct-current voltage, and finally stops operation, so that the previous operation can be protected to the greatest extent in a stable state, and the stability and the safety of the system are improved.
In summary, as shown in fig. 1, when the dc distribution system is shut down, the dc loads existing in the system are first removed, and when a plurality of dc loads exist in the system, the dc loads need to be removed one by one; after the direct current load is cut off, the distributed power sources are cut off, if a plurality of distributed power sources such as a photovoltaic panel and a wind driven generator exist in the system at the same time, all the distributed power sources need to be cut off at the same time; then judging whether an energy storage device exists in the system, and if so, cutting off the energy storage device; if the energy storage device does not exist, directly carrying out the next operation; then stopping operation to fix the active power converter station, and finally stopping operation to fix the active power converter station; and stopping the whole system.
Illustratively, fig. 2 shows a block diagram of a dc power distribution system according to an embodiment of the invention. As shown in fig. 2, in a direct current power distribution system (flexible grid system), a distributed power source is used to collect electric energy, a typical distributed power source mainly includes a photovoltaic cell for direct current power generation, a fan for alternating current power generation, and the like, the photovoltaic power generation generates direct current power, and due to its volatility, the direct current power is generally merged into a conventional alternating current power distribution network through a DC/DC (direct current voltage) and DC/AC (direct current/alternating current) two-stage converter or converter; although the wind turbine generates electric energy in an alternating current mode, the generated alternating current is generally unstable like a photovoltaic cell, and the generated alternating current can be incorporated into an alternating current distribution network generally through an AC/DC and DC/AC two-stage converter or converter; the direct current with a fixed voltage value is converted into a direct current power supply with a variable voltage value through a converter and is transmitted to a direct current bus, the direct current bus is provided for a load, the direct current load can be directly powered by the direct current bus, redundant electric energy of the distributed power supply can be converted through the converter and then stored in an energy storage device, and when the distributed power supply cannot provide the electric energy, the electric energy stored in the energy storage device is used for providing the electric energy for the whole system; the direct current bus is connected with the direct current bus through a direct current circuit, the direct current bus is connected with the converter station and can convert direct current into alternating current, and the alternating current bus and the alternating current circuit are connected with an alternating current system to provide the alternating current into the alternating current system; the direct-current power distribution system and the alternating-current power distribution system are butted.
When the power distribution system is shut down, firstly, the direct current load of the whole power distribution system is cut off, so that the electric energy on the direct current bus can not be input into the direct current load for consumption; then, the distributed power supply is cut off, namely the photovoltaic cell or the wind turbine is cut off, so that electric energy is not generated any more; and the energy storage device exists in the system, the energy storage device is cut off next step, so that the electric energy cannot be stored in the energy storage device continuously, and then the convertor station is shut down.
Firstly, the direct current load is cut off, and the influence on the stability of the whole system after the direct current load is cut off is small due to strong controllability of the direct current load; and then cutting off the distributed power supply, cutting off the energy storage device, having strong controllability, stopping operation of the active power converter, and finally stopping operation of the direct-current voltage converter station, wherein the direct-current voltage converter station controls the direct-current voltage to be below a maximum limit value, so that the stability of the direct-current voltage is maintained, the direct-current voltage converter station is left in the last one for stopping operation, the stability of the whole system is ensured, and the overall safety is further improved.
Although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A high-reliability shutdown method for a direct current power distribution system is characterized by comprising the following steps:
cutting off the load;
cutting off the distributed power supply;
if the energy storage device exists, cutting off the energy storage device, and if the energy storage device does not exist, entering the next operation;
stopping operation to fix the active power converter station;
and stopping the operation of the fixed direct-current voltage converter station.
2. The method of claim 1, wherein the method comprises the following steps:
the energy storage device comprises a super capacitor, a storage battery and the like, and is connected to a direct current bus through a converter, and the direct current bus provides electric energy stored by the energy storage device.
3. A method for stopping a dc power distribution system with high reliability according to claim 1 or 2, wherein:
the load is a direct current load, the direct current load is connected into a direct current bus through a converter, and the direct current bus supplies power to the direct current load;
the direct current load comprises a regular direct current load, a short circuit direct current load and an accident direct current load.
4. A method for stopping a dc power distribution system with high reliability as set forth in claim 3, wherein:
the frequent direct current load is a load which is supplied with power uninterruptedly by a direct current power supply in an operating state;
the frequent direct current load comprises a direct current relay which is electrified frequently, a signal lamp, a position indicator, a direct current illuminating lamp which is lightened frequently, an inverter power supply which is put into operation frequently and the like.
5. A method for stopping a dc power distribution system with high reliability as set forth in claim 3, wherein:
the short-circuit direct current load is the short-time maximum current borne by the direct current power supply;
the short-circuit direct current load comprises a relay protection and automatic device operation loop, a tripping coil of a circuit breaker and the like.
6. A method for stopping a dc power distribution system with high reliability as set forth in claim 3, wherein:
the accident direct current load is a load which is powered by an alternating current power supply during normal operation and powered by a direct current power supply after the self-use alternating current power supply disappears;
the accident direct current load comprises accident illumination, a gasoline engine lubricating oil pump, a generator hydrogen-cooled sealing oil pump, a carrier communication power supply and the like.
7. A method for stopping a dc power distribution system with high reliability according to any one of claims 1-2 and 4-6, wherein:
the distributed power supply comprises one or more of a wind driven generator, a photovoltaic panel and a micro gas turbine, and is connected into a direct current bus through a converter to provide electric energy for the direct current bus.
8. A method for stopping a dc power distribution system with high reliability according to any one of claims 1-2 and 4-6, wherein:
the fixed active power converter station comprises unipolar power control, bipolar power control and unipolar current control.
9. The method of claim 8, wherein the method comprises the steps of:
the voltage of the constant direct current voltage converter station is controlled below a maximum limit value so as to ensure the stability of direct current voltage.
10. The method of claim 9, wherein the method comprises the steps of:
and the fixed direct-current voltage converter station and the fixed active power converter station are connected with a direct-current bus and an alternating-current bus.
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| CN201910785942.8A CN110620375A (en) | 2019-08-23 | 2019-08-23 | High-reliability shutdown method for direct-current power distribution system |
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| CN201910785942.8A CN110620375A (en) | 2019-08-23 | 2019-08-23 | High-reliability shutdown method for direct-current power distribution system |
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Application publication date: 20191227 |