CN105406499A - Intelligent hybrid direct current power transmission system and fault handling method - Google Patents
Intelligent hybrid direct current power transmission system and fault handling method Download PDFInfo
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Abstract
The invention discloses an intelligent hybrid direct current power transmission system and a fault handling method. The fault handling method comprises the following steps: step 1, collecting the direct voltage and direct current of the hybrid direct current power transmission system, the alternating voltage of an alternating current power grid connected with an inversion converter station, and the sub module capacitor voltage of a voltage source type current converter in the inversion converter station; step 2, judging whether the hybrid direct current power transmission system is in fault or not according to the analog quantity collected in the step 1); and 3) if so, changing the power transmitted by a rectifying converter station, and concurrently changing the direct voltage generated by the inversion converter station and/or the alternating current output by the inversion converter station. The fault handling method can effectively solve the problem of the direct overvoltage caused by the fault of the alternating current power grid that is connected with the voltage source type current converter in the inversion side in the direct current power transmission system, so as to prevent the overvoltage of the direct current bus and the sub module capacitor; and in addition, the alternating current fault can be reliably handled so as to well protect the equipment safety.
Description
Technical field
The present invention relates to a kind of Hybrid HVDC system and fault handling method of intelligence, particularly relating to a kind of at least one end that is applied in is rectification current conversion station containing current source type converter, and one end is Hybrid HVDC system and the fault handling method of inversion current conversion station composition containing voltage source converter.
Background technology
HVDC (High Voltage Direct Current) transmission system can be divided into two types: the customary DC transmission system (LCC-HVDC) based on thyristor technology and the flexible direct current power transmission system (Flexible-HVDC) based on all-controlling power electronics device technology.Wherein, customary DC transmission system (LCC-HVDC) cost is low, loss is little, running technology is ripe, at present, the DC transmission system run in the world is nearly all LCC-HVDC system, but customary DC transmission system (LCC-HVDC) exist inverter side easily occur commutation failure, strong to the dependence of AC system, absorb the shortcomings such as idle, current conversion station floor space is in a large number large.The flexible direct current power transmission system (Flexible-HVDC) of a new generation then can realize active power and reactive power uneoupled control, can power to passive network, compact conformation floor space is little, there is not the advantages such as inverter side commutation failure problem, but it exists the defects such as with high costs, loss is larger.
Therefore the Hybrid HVDC system in conjunction with customary DC transmission of electricity and flexible DC power transmission will have good future in engineering applications.The topological structure of current Hybrid HVDC system mainly contains the mixing two-terminal direct current transmission system of the mixing two-terminal direct current transmission system of symmetrical monopolar wiring as shown in Figure 1 and the bipolar wiring of symmetry shown in Fig. 2.These two kinds of systems combine that customary DC transmission losses is little, running technology is ripe and flexible DC power transmission can be powered to passive network, the advantage of commutation failure can not occur.
But the Hybrid HVDC system in Fig. 1 and 2, when the AC network that inverter side voltage source converter connects breaks down, the active power of direct current system can not output to AC, and the current source type converter being in rectification state still according to set value and power reference to direct current system transmission power, now DC voltage will increase fast because energy constantly accumulates, and jeopardizes DC equipment safety the most at last.
In prior art, based on the customary DC transmission system of thyristor technology, when the AC network that inverter side connects breaks down, will there is commutation failure in inverter side converter, and this is equivalent to DC side and is short-circuited fault, thus can not cause large DC over-voltage.Based on the flexible direct current power transmission system of all-controlling power electronics device technology, when the AC network that inverter side connects breaks down, the active power of direct current system can not output to AC, now DC voltage also can increase because energy constantly accumulates fast, it keeps the voltage of DC side in controlled range by reducing DC side active power reference value fast, is unlikely to too high.But this kind of method is inapplicable for Hybrid HVDC system, the rectification side of Hybrid HVDC system is current source type converter, slow many than flexible direct current power transmission system of the speed of its power current adjuster, can not energy be stoped timely constantly to accumulate by reducing DC side active power reference value, add the effect of the energy stored by stray inductance of long feeder, the DC bus-bar voltage of Hybrid HVDC system and submodule capacitor voltage still significantly can exceed tolerance interval, jeopardize device security.
Summary of the invention
For the problems referred to above; the invention provides a kind of Hybrid HVDC system and fault handling method of intelligence; effectively can process DC over-voltage problem caused when AC network that in Hybrid HVDC system, inverter side voltage source converter connects breaks down; prevent DC bus and submodule capacitance overvoltage; pass through AC fault reliably, better proterctive equipment safety.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the present invention is achieved through the following technical solutions:
A kind of Hybrid HVDC system of intelligence, comprise Hybrid HVDC system, described Hybrid HVDC system comprises rectification current conversion station for connecting sending end AC network, for connecting the inversion current conversion station of receiving end AC network and the DC power transmission line for connecting rectification current conversion station and inversion current conversion station, described rectification current conversion station comprises at least one group of current source type inverter unit, and described inversion current conversion station comprises at least one group of voltage source converter unit;
It is characterized in that, also comprise fault treating apparatus, described fault treating apparatus comprises collecting unit, fault distinguishing unit, active power current control unit and direct-current voltage control unit, wherein:
Described collecting unit for gather the direct voltage of Hybrid HVDC system, direct current, inversion current conversion station connect the submodule capacitor voltage of voltage source converter in the alternating voltage of AC network and inversion current conversion station;
Described fault distinguishing unit is used for the state of the associated analog amount gathered according to collecting unit and then judges whether Hybrid HVDC system breaks down;
Described active power current control unit is used for the alternating current of power and the inversion current conversion station output exported according to the differentiation output control rectification current conversion station of fault distinguishing unit;
Described direct-current voltage control unit is used for the direct voltage produced according to the differentiation output control inversion current conversion station of fault distinguishing unit.
Wherein, whether rectification current conversion station and inversion current conversion station independently detect Hybrid HVDC system and break down, or whether rectification current conversion station communicates with inversion current conversion station and jointly detect Hybrid HVDC system and break down.
A fault handling method for the Hybrid HVDC system of intelligence, is characterized in that, comprise the steps:
Step 1, the direct voltage gathering Hybrid HVDC system, direct current, inversion current conversion station connect the submodule capacitor voltage of voltage source converter in the alternating voltage of AC network and inversion current conversion station;
The analog quantity that step 2, foundation step 1 gather differentiates whether Hybrid HVDC system breaks down;
If step 3 breaks down, then change the power of rectification current conversion station conveying, change the direct voltage of inversion current conversion station generation and/or the alternating current of output simultaneously.
Wherein, when failure vanishes, then the power before the power that rectification current conversion station is carried returns to fault, the direct voltage of inversion current conversion station generation and the alternating current of output return to the level before fault.
Preferably, rectification current conversion station is by increasing Trigger Angle or changing a kind of of direct current power/current-order according to the DC voltage value measured or combine the power changing conveying; Inversion current conversion station according to the effective value of ac bus voltage of actual measurement dynamically change alternating current instruction to change the alternating current of output, inversion current conversion station dynamically changes the switching number of submodule to change the direct voltage of generation according to the submodule capacitor voltage of actual measurement.
The invention has the beneficial effects as follows:
1) the present invention effectively can process the AC fault of inversion current conversion station end in Hybrid HVDC system, prevents DC bus and submodule capacitance overvoltage, passes through AC fault reliably, better proterctive equipment safety.
2) the present invention effectively can process DC over-voltage problem caused when AC network that in Hybrid HVDC system, inverter side inversion current conversion station connects breaks down, and can effectively keep DC voltage in controlled range between age at failure.
3) structure of the present invention is simple, easy to operate, when the AC network that can connect at inverter side inversion current conversion station breaks down, effectively prevents the rising of direct voltage, keeps DC voltage in controlled range, thus effectively passes through AC fault.
Accompanying drawing explanation
Fig. 1 is the mixing two-terminal direct current transmission system schematic diagram of symmetrical monopolar wiring;
Fig. 2 is the mixing two-terminal direct current transmission system schematic diagram of symmetrical bipolar wiring;
Fig. 3 is the structured flowchart of the Hybrid HVDC system failure processing unit of a kind of intelligence of the present invention;
Fig. 4 is the flow chart of the fault handling method of the Hybrid HVDC system of a kind of intelligence of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical solution of the present invention is described in further detail, can better understand the present invention to make those skilled in the art and can be implemented, but illustrated embodiment is not as a limitation of the invention.
A kind of Hybrid HVDC system of intelligence, comprise Hybrid HVDC system and fault treating apparatus, wherein, Hybrid HVDC system comprises rectification current conversion station for connecting sending end AC network, for connecting the inversion current conversion station of receiving end AC network and the DC power transmission line for connecting rectification current conversion station and inversion current conversion station, inversion current conversion station connects receiving end AC network by transformer, described rectification current conversion station comprises at least one group of current source type inverter unit, and described inversion current conversion station comprises at least one group of voltage source converter unit.
General, rectification current conversion station adopts the current source type converter based on thyristor device, and current source type converter can be six pulsation bridge circuits, 12 pulsation bridge circuits or two 12 pulsation bridge circuits; And inversion current conversion station adopts the voltage source converter based on all-controlling power electronics device, the submodule forming voltage source converter brachium pontis be following one or more: semi-bridge type, bridge-type, class bridge-type, the modular type of clamp Shuangzi, and the switching device forming submodule is full-controlled switch device, such as IGBT, IGCT, IEGT or GTO.
The mixing two-terminal direct current transmission system of the mixing two-terminal direct current transmission system of the symmetrical monopolar wiring shown in Fig. 1 and the bipolar wiring of symmetry shown in Fig. 2 is more common Hybrid HVDC system, the present invention is applicable to Hybrid HVDC system as depicted in figs. 1 and 2, but be not limited to this two kinds of transmission systems, method is applicable to all Hybrid HVDC systems.Be described using Fig. 2 as specific embodiment below.
As shown in Figure 2, Hybrid HVDC system comprises: rectification current conversion station and inversion current conversion station, both are connected by two DC power transmission line, wherein: rectification current conversion station sends inversion current conversion station to by DC power transmission line after being used for that the three-phase alternating current of sending end AC network is converted to direct current, the bus that sending end AC network enters the station can be connected with passive filter, may not have yet, need determine according to system engineering condition, when current source type converter is made up of thyristor converter device, generally need to install passive filter, sometimes also need to install reactive-load compensation capacitor.In Fig. 2, rectification current conversion station is made up of two groups of thyristor converter device units in series, and its series connection node connects earth electrode, and the positive and negative two ends after series connection are all connected with DC power transmission line by smoothing reactor; Between DC line and the earth, be equiped with DC filter simultaneously.
Thyristor converter device unit adopts 12 pulsation bridge circuits; Wherein, each brachium pontis is formed by several Thyristors in series, and thyristor converter device adopts constant DC current control policy control.The three-winding transformer that thyristor converter device is respectively Y0/Y/ Δ by a mode of connection is connected with sending end AC network, and transformer primary side is equiped with AC circuit breaker respectively.Transformer can carry out electric pressure conversion to the three-phase alternating current of sending end AC system, to adapt to required DC voltage level, two the six pulse conversion bridges not up and down being all 12 pulsation bridge-type thyristor converter devices of the transformer secondary mode of connection provide phase angle difference to be the three-phase alternating current of 30 °, to reduce the harmonic current flowing into electrical network.
Inversion current conversion station flows to receiving end AC network after being used for that direct current is converted to three-phase alternating current, it is composed in series by two groups of voltage source converter, its series connection node connects earth electrode, the two winding transformer that voltage source converter is Y0/ Δ by a mode of connection is connected with receiving end AC network, be equiped with AC circuit breaker respectively at transformer primary side, voltage source converter adopts to be determined direct voltage and determines Reactive Power Control policy control.
As shown in Figure 3, Hybrid HVDC system failure processing unit comprises collecting unit, fault distinguishing unit, active power current control unit and direct-current voltage control unit, is described in detail below to unit:
Described collecting unit for gather the direct voltage of Hybrid HVDC system, direct current, inversion current conversion station connect the submodule capacitor voltage of voltage source converter in the alternating voltage of AC network and inversion current conversion station;
Described fault distinguishing unit is used for the state of the associated analog amount gathered according to collecting unit and then judges whether Hybrid HVDC system breaks down;
Described active power current control unit is used for the alternating current of power and the inversion current conversion station output exported according to the differentiation output control rectification current conversion station of fault distinguishing unit;
Described direct-current voltage control unit is used for the direct voltage produced according to the differentiation output control inversion current conversion station of fault distinguishing unit.
Wherein, whether rectification current conversion station and inversion current conversion station independently can detect Hybrid HVDC system and break down, or whether rectification current conversion station communicates with inversion current conversion station and jointly detect Hybrid HVDC system and break down.
Wherein, when at least one of them meets following 5 conditions, fault distinguishing unit can differentiate Hybrid HVDC system jam:
1) direct voltage is greater than the first voltage definite value Uset1, and the duration more than first detection time definite value Tset1;
2) direct current is less than the first current ration Iset1, and the duration more than second detection time definite value Tset2;
3) rate of change of the absolute value of direct voltage is greater than first rate definite value DUset, and the duration more than the 3rd detection time definite value Tset3;
4) rate of change of the absolute value of direct current is greater than the second speed definite value DIset, and the duration more than the 4th detection time definite value Tset4;
5) voltage source converter connect the alternating voltage of AC network effective value be less than the second voltage definite value Uset2, and the duration more than the 5th detection time definite value Tset5.
When fault distinguishing unit judges Hybrid HVDC system jam, the power of rectification current conversion station conveying will be changed, and the alternating current of the direct voltage that inversion current conversion station produces or the alternating current of output or the direct voltage of generation and output will change.
Be specially:
Active power current control unit controls rectification current conversion station to be passed through to increase Trigger Angle (i.e. trigger delay angle) or change a kind of of direct current power/current-order according to the DC voltage value measured or combine the power changing conveying, i.e. the change of the power of rectification current conversion station conveying can be realized by any one in following three modes:
The first, the power of conveying is changed by increasing Trigger Angle fast;
The second, change according to the DC voltage value measured the power that direct current power/current-order changes conveying, it should be noted that, "/" all herein represents the meaning of "or";
Three, increase Trigger Angle simultaneously fast and change according to the DC voltage value measured the power that direct current power/current-order changes conveying.
And concrete the changing into of alternating current of the direct voltage that inversion current conversion station produces and/or output:
The effective value that active power current control unit controls the ac bus voltage of inversion current conversion station foundation actual measurement dynamically changes alternating current instruction to change the alternating current of output;
Direct-current voltage control unit controls inversion current conversion station and dynamically changes the switching number of submodule to change the direct voltage of generation according to the submodule capacitor voltage of surveying.
Whether fault distinguishing unit disappears according to the further failure judgement of associated analog amount of collecting unit collection after fault occurs, and when at least one of them meets following condition, fault distinguishing unit differentiates that the Hybrid HVDC system failure disappears:
The error of the direct current instruction a) before direct current and fault is less than the second current ration Iset2, and the duration more than the 6th detection time definite value Tset6;
B) direct voltage continues to be less than tertiary voltage definite value Uset3, and the duration more than the 7th detection time definite value Tset7;
C) voltage source converter connect the alternating voltage of AC network effective value be greater than the 4th voltage definite value Uset4, and the duration more than the 8th detection time definite value Tset8.
When failure vanishes, power, the direct voltage of inversion current conversion station generation and the alternating current of output before the power that active power current control unit and direct-current voltage control unit control rectification current conversion station are carried returns to fault return to the level before fault.
Wherein, Tset1 to Tset8, Iset1, Iset2, Uset1, Uset2, Uset3, Uset4, DUset and DIset value of different Hybrid HVDC systems are different according to the difference of its circuit performance parameters, below provide some spans:
The time span of definite value Tset1 to Tset8 is 0-5s, and the span of direct current definite value Iset1 and Iset2 is K
itimes rated direct current, wherein 0≤K
ithe span of≤2, direct voltage definite value Uset1 and Uset3 is K
u1times rated direct voltage, wherein 0<K
u1the span of≤2.5, alternating voltage definite value Uset2 and Uset4 is K
u2doubly specified alternating voltage, wherein 0<K
u2the span of≤1, DUset is the span of 0.001pu/s to 100pu/s, DIset is-100 to-0.001pu/s.
Can also be other conditions in concrete implementation procedure, specifically as the harmonics condition etc. of voltage source converter AC, be not limited to above-mentioned condition.
A fault handling method for the Hybrid HVDC system of intelligence, as shown in Figure 4, comprises the steps:
Step 1, the direct voltage gathering Hybrid HVDC system, direct current, inversion current conversion station connect the submodule capacitor voltage of voltage source converter in the alternating voltage of AC network and inversion current conversion station;
The analog quantity that step 2, foundation step 1 gather differentiates whether Hybrid HVDC system breaks down;
If step 3 breaks down, then change the power of rectification current conversion station conveying, change the direct voltage of inversion current conversion station generation and/or the alternating current of output simultaneously.
Preferably, when failure vanishes, then the power before the power that rectification current conversion station is carried returns to fault, the direct voltage of inversion current conversion station generation and the alternating current of output return to the level before fault.Be specially:
Rectification current conversion station is by increasing Trigger Angle or changing a kind of of direct current power/current-order according to the DC voltage value measured or combine the power changing conveying; Inversion current conversion station according to the effective value of ac bus voltage of actual measurement dynamically change alternating current instruction to change the alternating current of output, inversion current conversion station dynamically changes the switching number of submodule to change the direct voltage of generation according to the submodule capacitor voltage of actual measurement.
Corresponding with Hybrid HVDC system failure processing unit, when at least one of them meets following condition, differentiate Hybrid HVDC system jam:
1) direct voltage is greater than the first voltage definite value Uset1, and the duration more than first detection time definite value Tset1;
2) direct current is less than the first current ration Iset1, and the duration more than second detection time definite value Tset2;
3) rate of change of the absolute value of direct voltage is greater than first rate definite value DUset, and the duration more than the 3rd detection time definite value Tset3;
4) rate of change of the absolute value of direct current is greater than the second speed definite value DIset, and the duration more than the 4th detection time definite value Tset4;
5) voltage source converter connect the alternating voltage of AC network effective value be less than the second voltage definite value Uset2, and the duration more than the 5th detection time definite value Tset5;
When at least one of them meets following condition, differentiate that the Hybrid HVDC system failure disappears:
The error of the direct current instruction a) before direct current and fault is less than the second current ration Iset2, and the duration more than the 6th detection time definite value Tset6;
B) direct voltage continues to be less than tertiary voltage definite value Uset3, and the duration more than the 7th detection time definite value Tset7;
C) voltage source converter connect the alternating voltage of AC network effective value be greater than the 4th voltage definite value Uset4, and the duration more than the 8th detection time definite value Tset8.
Only be described with a specific embodiment of the Hybrid HVDC system shown in Fig. 2 below, its fault handling method is similar, repeats no more.
A mixing two-terminal direct current transmission system as shown in Figure 2, current source type converter is in converting plant, voltage source converter is in Inverter Station, in system normal course of operation, detect that the effective value of the alternating voltage of the AC network that voltage source converter connects is less than the specified ac voltage of 0.8 times when Inverter Station collection, and the duration is more than 10ms, then Inverter Station determines that the AC system that now voltage source converter connects breaks down, and give converting plant by fault-signal by the communication between two stations, after converting plant receives this fault-signal, the power control unit of converting plant reduces the power of sending end current source type converter conveying by increasing Trigger Angle fast or changes according to the DC voltage value measured the power that direct current power/current-order reduces the conveying of sending end current source type converter immediately, or increase Trigger Angle simultaneously fast and change according to the DC voltage value measured the power that direct current power/current-order reduces the conveying of sending end current source type converter, simultaneously, Inverter Station by the voltage source converter according to actual measurement connect ac bus voltage effective value dynamically change alternating current instruction, and then change the alternating current of voltage source converter output, and the direct voltage that control voltage source type converter produces remains unchanged by the direct-current voltage control unit of Inverter Station.
In failure process, detect that the effective value of the alternating voltage of the AC network that voltage source converter connects is greater than the specified ac voltage of 0.9 times when Inverter Station collection, and the duration is more than 10ms, then Inverter Station determines that the fault in ac transmission system that now voltage source converter connects disappears, and give converting plant by this failure vanishes signal by the communication between two stations, after converting plant receives this failure vanishes signal, the intervention to Trigger Angle and direct current power/current-order cancelled immediately by the current source type converter of converting plant, the power of conveying is returned to the power level before fault, the voltage source converter of Inverter Station cancels the intervention to direct voltage and alternating current instruction immediately, the direct voltage of generation and the alternating current of output are returned to the level before fault.
The invention has the beneficial effects as follows:
1) the present invention effectively can process the AC fault of inversion current conversion station end in Hybrid HVDC system, prevents DC bus and submodule capacitance overvoltage, passes through AC fault reliably, better proterctive equipment safety.
2) the present invention effectively can process DC over-voltage problem caused when AC network that in Hybrid HVDC system, inverter side inversion current conversion station connects breaks down, and can effectively keep DC voltage in controlled range between age at failure.
3) structure of the present invention is simple, easy to operate, when the AC network that can connect at inverter side inversion current conversion station breaks down, effectively prevents the rising of direct voltage, keeps DC voltage in controlled range, thus effectively passes through AC fault.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in the technical field that other are relevant, be all in like manner included in scope of patent protection of the present invention.
Claims (12)
1. an intelligent Hybrid HVDC system, comprise Hybrid HVDC system, described Hybrid HVDC system comprises rectification current conversion station for connecting sending end AC network, for connecting the inversion current conversion station of receiving end AC network and the DC power transmission line for connecting rectification current conversion station and inversion current conversion station, described rectification current conversion station comprises at least one group of current source type inverter unit, and described inversion current conversion station comprises at least one group of voltage source converter unit;
It is characterized in that, also comprise fault treating apparatus, described fault treating apparatus comprises collecting unit, fault distinguishing unit, active power current control unit and direct-current voltage control unit, wherein:
Described collecting unit for gather the direct voltage of Hybrid HVDC system, direct current, inversion current conversion station connect the submodule capacitor voltage of voltage source converter in the alternating voltage of AC network and inversion current conversion station;
Described fault distinguishing unit is used for the state of the associated analog amount gathered according to collecting unit and then judges whether Hybrid HVDC system breaks down;
Described active power current control unit is used for the alternating current of power and the inversion current conversion station output exported according to the differentiation output control rectification current conversion station of fault distinguishing unit;
Described direct-current voltage control unit is used for the direct voltage produced according to the differentiation output control inversion current conversion station of fault distinguishing unit.
2. the Hybrid HVDC system failure processing unit of a kind of intelligence according to claim 1, it is characterized in that, whether rectification current conversion station and inversion current conversion station independently detect Hybrid HVDC system and break down, or whether rectification current conversion station communicates with inversion current conversion station and jointly detect Hybrid HVDC system and break down.
3. the Hybrid HVDC system failure processing unit of a kind of intelligence according to claim 2, it is characterized in that, when fault distinguishing unit judges Hybrid HVDC system jam: active power current control unit controls rectification current conversion station changes conveying power by a kind of or combination of the DC voltage value change direct current power/current-order increasing Trigger Angle or foundation measurement.
4. the Hybrid HVDC system failure processing unit of a kind of intelligence according to claim 1, it is characterized in that, when fault distinguishing unit judges Hybrid HVDC system jam: the alternating current of the direct voltage that inversion current conversion station produces and/or output changes.
5. the Hybrid HVDC system failure processing unit of a kind of intelligence according to claim 3, is characterized in that, concrete the changing into of alternating current of the direct voltage that inversion current conversion station produces and/or output:
The effective value that active power current control unit controls the ac bus voltage of inversion current conversion station foundation actual measurement dynamically changes alternating current instruction to change the alternating current of output;
Direct-current voltage control unit controls inversion current conversion station and dynamically changes the switching number of submodule to change the direct voltage of generation according to the submodule capacitor voltage of surveying.
6. the Hybrid HVDC system failure processing unit of a kind of intelligence according to claim 1, is characterized in that, whether described fault distinguishing unit disappears according to the further failure judgement of associated analog amount of collecting unit collection after fault occurs.
7. the Hybrid HVDC system failure processing unit of a kind of intelligence according to claim 6, is characterized in that:
When at least one of them meets following condition, fault distinguishing unit differentiates Hybrid HVDC system jam:
1) direct voltage is greater than the first voltage definite value, and the duration more than first detection time definite value;
2) direct current is less than the first current ration, and the duration more than second detection time definite value;
3) rate of change of the absolute value of direct voltage is greater than first rate definite value, and the duration more than the 3rd detection time definite value;
4) rate of change of the absolute value of direct current is greater than the second speed definite value, and the duration more than the 4th detection time definite value;
5) voltage source converter connect the alternating voltage of AC network effective value be less than the second voltage definite value, and the duration more than the 5th detection time definite value;
When at least one of them meets following condition, fault distinguishing unit differentiates that the Hybrid HVDC system failure disappears:
The error of the direct current instruction a) before direct current and fault is less than the second current ration, and the duration more than the 6th detection time definite value;
B) direct voltage continues to be less than tertiary voltage definite value, and the duration more than the 7th detection time definite value;
C) voltage source converter connect the alternating voltage of AC network effective value be greater than the 4th voltage definite value, and the duration more than the 8th detection time definite value.
8. the Hybrid HVDC system failure processing unit of a kind of intelligence according to claim 6, it is characterized in that, when failure vanishes, power, the direct voltage of inversion current conversion station generation and the alternating current of output before the power that active power current control unit and direct-current voltage control unit control rectification current conversion station are carried returns to fault return to the level before fault.
9. the fault handling method of an intelligent Hybrid HVDC system, it is characterized in that, comprise the steps: step 1, the direct voltage gathering Hybrid HVDC system, direct current, inversion current conversion station connect the submodule capacitor voltage of voltage source converter in the alternating voltage of AC network and inversion current conversion station;
The analog quantity that step 2, foundation step 1 gather differentiates whether Hybrid HVDC system breaks down;
If step 3 breaks down, then change the power of rectification current conversion station conveying, change the direct voltage of inversion current conversion station generation and/or the alternating current of output simultaneously.
10. the fault handling method of the Hybrid HVDC system of a kind of intelligence according to claim 9, it is characterized in that, when failure vanishes, then the power before the power that rectification current conversion station is carried returns to fault, the direct voltage of inversion current conversion station generation and the alternating current of output return to the level before fault.
The fault handling method of the Hybrid HVDC system of 11. a kind of intelligence according to claim 9, it is characterized in that, rectification current conversion station is by increasing Trigger Angle or changing a kind of of direct current power/current-order according to the DC voltage value measured or combine the power changing conveying; Inversion current conversion station according to the effective value of ac bus voltage of actual measurement dynamically change alternating current instruction to change the alternating current of output, inversion current conversion station dynamically changes the switching number of submodule to change the direct voltage of generation according to the submodule capacitor voltage of actual measurement.
The fault handling method of the Hybrid HVDC system of 12. a kind of intelligence according to claim 9, is characterized in that:
When at least one of them meets following condition, differentiate Hybrid HVDC system jam:
1) direct voltage is greater than the first voltage definite value, and the duration more than first detection time definite value;
2) direct current is less than the first current ration, and the duration more than second detection time definite value;
3) rate of change of the absolute value of direct voltage is greater than first rate definite value, and the duration more than the 3rd detection time definite value;
4) rate of change of the absolute value of direct current is greater than the second speed definite value, and the duration more than the 4th detection time definite value;
5) voltage source converter connect the alternating voltage of AC network effective value be less than the second voltage definite value, and the duration more than the 5th detection time definite value;
When at least one of them meets following condition, differentiate that the Hybrid HVDC system failure disappears:
The error of the direct current instruction a) before direct current and fault is less than the second current ration, and the duration more than the 6th detection time definite value;
B) direct voltage continues to be less than tertiary voltage definite value, and the duration more than the 7th detection time definite value;
C) voltage source converter connect the alternating voltage of AC network effective value be greater than the 4th voltage definite value, and the duration more than the 8th detection time definite value.
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| CN106058826A (en) * | 2016-06-03 | 2016-10-26 | 南京南瑞继保电气有限公司 | Method for handling failure of alternating current side of invertor side of mixed-type direct current transmission system |
| CN106329560A (en) * | 2016-11-09 | 2017-01-11 | 北京四方继保自动化股份有限公司 | Method for increasing hybrid direct-current rectifier side power in alternating-current fault period |
| CN106711972A (en) * | 2017-02-24 | 2017-05-24 | 国家电网公司西南分部 | Evaluation method for distance protection performance of mixed direct current feeding alternating current system |
| CN107017654A (en) * | 2017-05-31 | 2017-08-04 | 国网四川省电力公司电力科学研究院 | A kind of extra-high voltage direct-current transmission control device for suppressing exchange temporary overvoltage |
| CN107147140A (en) * | 2017-05-05 | 2017-09-08 | 南京南瑞继保电气有限公司 | A kind of DC transmission system power instruction deviation monitoring device and deviation monitoring method |
| CN107785921A (en) * | 2017-11-13 | 2018-03-09 | 国网天津市电力公司 | Urban distribution network subregion interconnected operation dispatching method based on Technology of HVDC based Voltage Source Converter |
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| CN113162100A (en) * | 2021-03-29 | 2021-07-23 | 南京南瑞继保电气有限公司 | Control method and device for hybrid cascade direct current transmission system and electronic equipment |
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