CN109560564B - Method for restraining converter overload of flexible direct current transmission bipolar system - Google Patents
Method for restraining converter overload of flexible direct current transmission bipolar system Download PDFInfo
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- CN109560564B CN109560564B CN201710886506.0A CN201710886506A CN109560564B CN 109560564 B CN109560564 B CN 109560564B CN 201710886506 A CN201710886506 A CN 201710886506A CN 109560564 B CN109560564 B CN 109560564B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 34
- 230000000452 restraining effect Effects 0.000 title claims abstract description 16
- 230000021715 photosynthesis, light harvesting Effects 0.000 claims abstract description 5
- 238000005265 energy consumption Methods 0.000 claims description 9
- 230000005404 monopole Effects 0.000 claims description 4
- 238000012544 monitoring process Methods 0.000 claims description 3
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- 238000013461 design Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- H02J3/383—
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- H02J3/386—
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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 method for restraining overload of a converter in a flexible direct current transmission bipolar system, which aims at an island passive system connected with new energy access and the like, wherein two poles of the alternating current side of the bipolar converter are respectively connected with an independent alternating current bus, electronic switch equipment is adopted as a bus-coupled switch for the bipolar bus, the converter operates in a bipolar mode, the bus-coupled electronic switch is connected, when one pole is locked, when the bipolar power is monitored to be larger than the maximum power limit of the bipolar converter, the bus-coupled electronic switch is disconnected, and when the bipolar power is smaller than the maximum power limit of the one pole, the electronic switch is kept in a conducting state. In addition, aiming at the problem that the converter from the direct current line of the sending end converter to the receiving end converter has a fault, energy dissipation resistance devices connected through electronic switches are respectively added on the positive direct current bus and the negative direct current bus, and the electronic switches are switched on to put into the energy dissipation resistance devices when the direct current overvoltage is detected, so that the overvoltage of the converter is restrained.
Description
Technical Field
The invention belongs to the field of flexible power transmission of a power system, and particularly relates to a method for restraining overload of a converter by a flexible direct-current power transmission bipolar system.
Background
The flexible direct current transmission adopts the voltage source converter, can independently adjust active and reactive output, improves the transmission capacity of an alternating current system, is easy to form a multi-terminal direct current transmission system, and has obvious competitiveness in the application fields of renewable energy power generation grid connection, island urban power supply, alternating current system interconnection and the like. With the advancement of power electronics and control technology, the capacity and voltage rating of flexible dc power transmission systems is increasing.
In order to meet the requirement of high-capacity power transmission, the number of sub-modules needs to be increased to improve the voltage level, but the control difficulty of the valve control equipment is increased due to the fact that too many sub-modules are cascaded, so that the bipolar structure is adopted, the purpose of achieving the same transmission power while the number of the cascaded sub-modules of a single converter unit is reduced, and the bipolar structure becomes a feasible choice.
When realizing that the renewable new energy of island sends out, new energy such as wind-powered electricity generation, photovoltaic multiple spot is remitted into alternating current bus, and the bipolar each inserts alternating current bus, if bipolar bus is not connected, two polar power is unbalanced, and the transverter earthing pole has great current problem, and in addition, when a utmost point of transverter broke down, the bus power of connecting this utmost point will all lose, can't realize effectively sending out of new energy. If the bipolar bus bar is directly connected without control, when one pole fails, the other pole is in overload shutdown risk due to power transfer. In addition, when a fault occurs outside the sending-end converter area, power cannot be sent out, and a direct-current overvoltage problem and the like occur at the corresponding fault pole.
In order to effectively and reliably solve the problems that one pole of a bipolar system converter is locked due to faults, the other pole of the bipolar system converter is prevented from overload outage, a sending end converter has an out-of-area fault, direct-current overvoltage is prevented from occurring on a fault pole, and effective sending of new energy is guaranteed, a new overload and direct-current overvoltage suppression method needs to be found.
Disclosure of Invention
The invention aims to provide a method for restraining the overload of a converter by a flexible direct current transmission bipolar system, which can restrain the overload problem of the other pole in response to the single pole fault, solve the direct current overvoltage problem and optimally realize the reliable delivery of new energy.
In order to achieve the above purpose, the solution of the invention is:
a method for restraining overload of a converter in a flexible direct current transmission bipolar system is characterized in that alternating-current side bipoles of the bipolar converter are respectively connected with respective alternating-current buses, bus-coupled electronic type switch equipment is additionally arranged between the alternating-current buses for connection, the bipolar of the converter operates, the bus-coupled electronic type switch is connected, when one pole of the converter is locked, the bus-coupled electronic type switch is disconnected when the bipolar power is monitored and judged to be larger than the maximum power limit Pmax of a single-pole converter, and when the bipolar power is smaller than the maximum power limit Pmax of the single-pole converter, the bus-coupled electronic type switch is kept in a connected state.
Further, the specific operation steps are as follows:
(1) the double poles of the current converter are respectively connected to respective alternating current buses, bus-coupled electronic type switch equipment is additionally arranged between the alternating current buses, and the bus-coupled electronic type switch is in a communicated state;
(2) judging and comparing the current bipolar bus power P (P1 + P2) with the maximum power limit Pmax of the unipolar converter; when the monopole is locked due to a fault, judging that when P is larger than or equal to Pmax, delaying t moment, breaking the bus-coupled electronic switch QF, and when P is smaller than Pmax, keeping the bus-coupled electronic switch QF in a connected state;
(3) after one pole of the converter is locked due to a fault, the power on the alternating current bus corresponding to the fault pole is sent out or stopped to be sent out from the other normal pole according to the state of the bus-coupled electronic switch, so that the power sent out by the non-fault pole is ensured to be within Pmax, and the problem of overload shutdown of the other pole caused by the fault pole is solved.
Further, the settable range of the delay T in the step (2) is (0-T)set)，TsetAnd the time is less than the time for the power of the other pole to rise to the overload threshold of the current converter after the single pole is locked.
Further, the bus-bar electronic switch is a fast electronic switch device with a current switching function.
Furthermore, the bus-bar electronic switch is a power electronic switch or a direct current breaker.
Further, the maximum power limit Pmax of the unipolar converter is a converter design capacity or a converter operation maximum power interval limit value set manually.
Further, the method is applied to a new energy source sending end converter to restrain overload.
Furthermore, when the direct current line to the receiving end converter fails and cannot be sent out for grid connection, an electronic switch is added on the positive and negative direct current buses to connect with an energy consumption resistance device so as to inhibit direct current overvoltage.
Further, the control method for increasing the electronic switch connection energy consumption resistance device is concretely that when a fault occurs outside a converter region of a one-pole sending end, a direct-current overvoltage occurs at a fault pole, and the pole direct-current voltage U is judgeddcAnd an overvoltage set value Udcset when Udc≥UdcWhen set, the pole electronic switch is turned on at the time of delay delta t, and a power consumption resistance device is put into use, so that the purpose of suppressing direct current overvoltage is achieved.
Further, the delay delta t is less than the action time t of the direct current overvoltage protectionovSaid overvoltage setpoint UdcAnd the set is smaller than the overvoltage bearing threshold value of the equipment.
Further, the method for restraining the overload of the converter by the flexible direct current power transmission bipolar system is applied to the flexible direct current power transmission island bipolar system.
The method for restraining the overload of the converter in the flexible direct current transmission bipolar system comprises the steps of increasing a bus electronic switch, monitoring, judging and comparing bipolar power and unipolar maximum power, controlling the bus switch to be disconnected when a unipolar of the converter is locked due to fault, effectively restraining the overload problem of the other electrode when the unipolar fault is responded, and putting an energy consumption resistance device when the overvoltage problem occurs to restrain the overvoltage and optimally achieving reliable sending of new energy.
Drawings
FIG. 1 is a schematic diagram of an additional electronic switch and energy dissipation device of a flexible DC power transmission bipolar system according to the present invention;
fig. 2 is a schematic diagram of a method for suppressing overload of a converter by using a flexible direct current transmission bipolar system according to the invention.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of adding an electronic switch and an energy consumption device to a flexible direct-current transmission bipolar system in the present invention, that is, adding a QF bus-coupled electronic switch between a pole 1 alternating-current bus and a pole 2 alternating-current bus to connect, adding a QF3 electronic switch to connect with an energy consumption resistance device to the pole 1, and adding a QF4 electronic switch to connect with an energy consumption resistance device to the pole 2. Fig. 2 is a schematic diagram of a method for suppressing overload of a converter in a flexible direct-current transmission bipolar system, where the method specifically includes the following steps:
(1) the bipolar alternating current sides of the current converter are respectively connected with alternating current buses, bus-coupled electronic type switch equipment QF between the alternating current buses is added, and the bus-coupled electronic type switch QF is in a connected state;
(2) monitoring power P1 sent by a converter pole 1, power P2 sent by a pole 2, calculating bipolar power P (P1 + P2), and judging and comparing the current bipolar bus power P with the maximum power Pmax of the unipolar converter; when the monopole has a fault, judging that the bus-bar electronic switch QF is switched off at the time of delay t when P is larger than or equal to Pmax, and keeping the bus-bar electronic switch QF in a connected state when P is smaller than Pmax;
(3) after one pole of the converter is locked due to a fault, the power on the alternating current bus corresponding to the fault pole is sent out or stopped to be sent out from the other normal pole according to the switching state of the bus-coupled electronic switch, so that the sending power of the non-fault pole is ensured to be within Pmax, the overload shutdown of the other pole caused by the fault pole is avoided, and the maximum new energy sending is realized;
(4) after a fault occurs to one pole outside a current converter sending end area, supposing that a pole 1 fails, power cannot be sent out for grid connection, and detecting the overvoltage condition of the fault pole 1 and the pole 1 direct-current voltage UdcExceeding the overpressure set value UdcAnd set, the electronic switch QF3 of the energy consumption resistor of the connecting electrode 1 is turned on at the time of delaying delta t, and the direct-current overvoltage problem is restrained through the energy consumption of the resistor.
The invention relates to a method for restraining overload of a converter, which is implemented by taking a method for restraining overload of the converter as an example, wherein an alternating current bus is respectively connected to alternating current sides of a bipolar converter, the buses are connected through a bus-coupled electronic switch, the method is not limited to a method for restraining overload of the converter, the bipolar system is respectively connected to the alternating current buses, the method is suitable for being connected with a plurality of alternating current buses at the alternating current sides, the buses are connected through the bus-coupled electronic switch, and according to the method, when a single pole fails, the method for restraining the overload of the converter under the condition of the disconnection state of the bus-coupled electronic switch is determined by judging the power condition.
When the single-pole fault is responded, the conditions of the bipolar power and the single-pole maximum power are judged and compared, and the method for operating the bus-bar electronic switch is determined, and is a method for restraining overload of a new energy transmission end power transmission system. In addition, when the direct current line or the receiving end converter breaks down and detects direct current overvoltage, the electronic switch is controlled to be conducted and put into the energy dissipation resistance device, and the direct current overvoltage problem is solved.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (10)
1. A method for restraining overload of a converter by a flexible direct current transmission bipolar system is characterized by comprising the following steps: the method comprises the following steps that the alternating current side double poles of a double-pole converter are respectively connected with respective alternating current buses, bus-coupled electronic type switch equipment is additionally arranged between the alternating current buses for connection, the double poles of the converter operate, the bus-coupled electronic type switch is connected, when one pole of the converter is locked, the bus-coupled electronic type switch is disconnected when the monitoring and judging result shows that the double-pole power is larger than the maximum power limit Pmax of the single-pole converter, and when the double-pole power is smaller than the maximum power limit Pmax of the single-pole converter, the bus-coupled electronic type switch is kept in a conducting state; when the direct current overvoltage is detected, the electronic switch is controlled to be conducted, the energy dissipation resistance device is put into use, and the direct current overvoltage is restrained.
2. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 1 comprises the following specific operation steps:
(1) the double poles of the current converter are respectively connected to respective alternating current buses, bus-coupled electronic type switch equipment is additionally arranged between the alternating current buses, and the bus-coupled electronic type switch is in a communicated state;
(2) judging and comparing the current bipolar bus power P (P1 + P2) with the maximum power limit Pmax of the unipolar converter; when the monopole is locked due to a fault, judging that when P is larger than or equal to Pmax, delaying t moment, breaking the bus-coupled electronic switch QF, and when P is smaller than Pmax, keeping the bus-coupled electronic switch QF in a connected state;
(3) after one pole of the converter is locked due to a fault, the power on the alternating current bus corresponding to the fault pole is sent out or stopped to be sent out from the other normal pole according to the state of the bus-coupled electronic switch, so that the power sent out by the non-fault pole is ensured to be within Pmax, and the problem of overload shutdown of the other pole caused by the fault pole is solved.
3. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 2, wherein the method comprises the following steps: the settable time delay T range in the step (2) is (0-T)set)，TsetAnd the time is less than the time for the power of the other pole to rise to the overload threshold of the current converter after the single pole is locked.
4. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 1, wherein the method comprises the following steps: the bus-bar electronic switch is a rapid electronic switch device with a current switching-on and switching-off function.
5. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 4, wherein the method comprises the following steps: the bus-tie electronic switch is a power electronic switch or a direct-current circuit breaker.
6. A method of suppressing converter overload in a flexible DC power transmission bipolar system according to any one of claims 1 to 5, characterized by: and the maximum power limit Pmax of the monopole converter is the designed capacity of the converter or the limit value of the maximum power interval of the converter which is set manually.
7. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 1, wherein the method comprises the following steps: the method is applied to the new energy sending end converter to restrain overload.
8. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 1, wherein the method comprises the following steps: the control method for increasing the connection of the electronic switch with the energy consumption resistor device is characterized in that when a fault occurs outside a converter region of a sending end of one pole, direct-current overvoltage occurs at a fault pole, and the direct-current voltage U of the pole is judgeddcAnd an overvoltage set value Udcset when Udc≥UdcWhen set, the pole electronic switch is turned on at the time of delay delta t, and a power consumption resistance device is put into use, so that the purpose of suppressing direct current overvoltage is achieved.
9. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 8, wherein the method comprises the following steps: the delay delta t is less than the action time t of the direct current overvoltage protectionovSaid overvoltage setpoint UdcAnd the set is smaller than the overvoltage bearing threshold value of the equipment.
10. The method for suppressing the overload of the converter by the flexible direct current transmission bipolar system according to claim 1, wherein the method comprises the following steps: the method for restraining the overload of the converter by the flexible direct current transmission bipolar system is applied to the flexible direct current transmission island bipolar system.
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| CN201710886506.0A CN109560564B (en) | 2017-09-27 | 2017-09-27 | Method for restraining converter overload of flexible direct current transmission bipolar system |
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| CN201710886506.0A CN109560564B (en) | 2017-09-27 | 2017-09-27 | Method for restraining converter overload of flexible direct current transmission bipolar system |
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| CN109560564B true CN109560564B (en) | 2022-05-17 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618305A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Method for live access of multi-terminal flexible direct-current power transmission system by using isolating switch |
| CN105140948A (en) * | 2015-07-06 | 2015-12-09 | 南京南瑞继保电气有限公司 | Flexible direct current transmission system power coordination control method |
| CN105162155A (en) * | 2015-08-26 | 2015-12-16 | 浙江大学 | Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability |
| CN107039993A (en) * | 2017-04-20 | 2017-08-11 | 国网福建省电力有限公司 | Symmetrical bipolar flexible direct-current transmission converter power turns band control method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103618305A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Method for live access of multi-terminal flexible direct-current power transmission system by using isolating switch |
| CN105140948A (en) * | 2015-07-06 | 2015-12-09 | 南京南瑞继保电气有限公司 | Flexible direct current transmission system power coordination control method |
| CN105162155A (en) * | 2015-08-26 | 2015-12-16 | 浙江大学 | Series hybrid bipolar direct-current transmission system with direct-current fault ride-through capability |
| CN107039993A (en) * | 2017-04-20 | 2017-08-11 | 国网福建省电力有限公司 | Symmetrical bipolar flexible direct-current transmission converter power turns band control method |
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