CN106532745B - A kind of frequency coordination control method for sending out isolated island for more DC lines - Google Patents
A kind of frequency coordination control method for sending out isolated island for more DC lines Download PDFInfo
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- CN106532745B CN106532745B CN201611158927.3A CN201611158927A CN106532745B CN 106532745 B CN106532745 B CN 106532745B CN 201611158927 A CN201611158927 A CN 201611158927A CN 106532745 B CN106532745 B CN 106532745B
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Abstract
The invention discloses a kind of frequency coordination control methods that isolated island is sent out for more DC lines.When monopole, bipolar DC locking failure occurs in system, instruction (RUNUP), direct current frequency limiter (FLC), dynamo governor primary frequency modulation, the steady secondary control means for cutting machine of control minute wheel are promoted using dc power, emergent control is carried out to the frequency under island-grid catastrophe failure.The multiple-circuit line sending that the present invention is suitable for having centralized control main website.
Description
Technical field
The invention belongs to the technical fields of power system security stability analysis, and in particular to one kind is sent for more DC lines
The frequency coordination control method of isolated island out.
Background technique
South electric network region resource characteristic and economic development disequilibrium, determine south electric network in significant period of time
It is interior to carry out transferring electricity from the west to the east and trans-regional most optimum distribution of resources.Yunnan hydropower is resourceful, as south electric network large size water
Electricity sends base outside, and as electric power sends the continuous expansion of scale outside, by 2016, western Shandong DC back to back engineering and ± 500kV were forever
Benevolence to Funing DC engineering is built up put into operation after, Yunnan Power System realizes 6 times DC transmission systems and south electric network major network asynchronous
Net.The island-grid sent out is concentrated as more direct currents, different type direct current, the safety and stability problem that Yunnan Power System faces is by networking
Angle stability problem under mode becomes the frequency stabilization problem under decoupled mode.
Although DC transmission system has many advantages, such as, but there is also some problems for opposite AC system.When list occurs for system
It returns or multiple-circuit line is latched or bipolar locking, due to power surplus in netting, system frequency will be increased, and caused consequence is tighter
Weight.Therefore after there is direct current system multipole locking failure, system needs largely cut machine, cut off its mating power supply.Due to direct current
The capacity of system support power supply is all larger, and the rated capacity of single unit is in 600MW or more, if therefore can take certain after failure
A little measures cut machine on the basis of guaranteeing system safe and stable operation, it will bring great economic benefit to power grid less.
Summary of the invention
For above-mentioned technological deficiency present in the prior art, asked to solve island-grid frequency caused by direct current is latched
Topic, the invention proposes a kind of frequency coordination control methods that isolated island is sent out for more DC lines.
The present invention specifically uses following technical scheme.
A kind of frequency coordination control method for sending out isolated island for more DC lines, it is characterised in that:
When occurring monopole, bipolar DC locking failure in more DC lines, instruction, direct current frequency are promoted using dc power
Limiter, dynamo governor primary frequency modulation, steady control minute wheel cut the control means of machine, to the frequency under island-grid catastrophe failure
Rate carries out emergent control.
A kind of frequency coordination control method for sending out isolated island for more DC lines, which is characterized in that the frequency coordination
Control method the following steps are included:
(1) the realtime power value that every time DC line conveys in real time is obtained, according to the overload capacity of DC line, is calculated every
Return the watt level that DC line is capable of modulated in real time；
(2) it judges whether there is DC line and monopole locking or bipolar locking occurs, if so, (3) are thened follow the steps, otherwise,
Return step (1)；
(3) whether all normal judge the corresponding control channel of each time DC line, if so, (4) are thened follow the steps, otherwise,
It executes step (5)；
(4) all DC lines promote the dc power in all DC lines of instruction promotion using dc power, reduce
Island-grid unbalanced power amount, subsequently into step (6)；
(5) the normal DC line of control channel promotes the direct current function in instruction promotion DC line using dc power
Whether rate reduces island-grid unbalanced power amount, subsequently determines whether island-grid frequency variation Δ f in direct current frequency limiter
In the operating dead zone dead_flc of FLC, when island-grid frequency variation Δ f is dead greater than the movement of direct current frequency limiter FLC
When area dead_flc, then the DC line that control channel is interrupted carries out island-grid frequency using direct current frequency limiter FLC
It adjusts, subsequently into step (6)；When island-grid frequency variation Δ f is less than the operating dead zone of direct current frequency limiter FLC
When dead_flc, it is directly entered step (6)；
(6) judge whether the frequency variation Δ f of island-grid is greater than the operating dead zone dead_gov of dynamo governor,
If it is, primary frequency modulation is carried out using dynamo governor, subsequently into step (7)；Otherwise return step (1)；
(7) judge whether island-grid frequency is cutting unit frequency threshold value freq_cut or more, if it is, starting safety
Stabilization control device, according to the control scheme list that off-line simulation is formulated, minute wheel time excision generating set；Otherwise, return step
(1)。
The present invention further comprises following preferred embodiment:
In step (1), for flexible DC transmission route using 1.0p.u. overload as the power regulation upper limit, routine is straight
Transmission line of electricity is flowed using 1.2p.u. overload as the power regulation upper limit, wherein p.u. refers to customary DC transmission line of electricity or soft
Property DC power transmission line rated power per unit value.
Step (4) includes the following contents:
4.1, according to power before the failure for the DC line being latched, obtain island-grid unbalanced power amount Δ P；
4.2 are capable of the watt level of modulated in real time according to each DC line that step (1) obtains, the isolated island that needs are adjusted
What grid power amount of unbalance Δ P was averagely allocated to the DC line being latched operates normally the straight of pole and other normal operations
Flow Line.
Step (5) includes the following contents:
5.1, according to power before the failure for the DC line being latched, obtain island-grid unbalanced power amount Δ P；
5.2 are capable of the watt level of modulated in real time according to each DC line that step (1) obtains, the isolated island that needs are adjusted
Normal operation pole that grid power amount of unbalance Δ P is averagely allocated to the direct current being latched and other control channels are normally and just
The DC line often run；
If the active power of the normal DC line of 5.3 control channels is promoted, fail to control island-grid frequency straight
In the operating dead zone dead_flc for flowing frequency limit device FLC, then the DC line for the normal operation interrupted using control channel
Island-grid frequency is adjusted in direct current frequency limiter FLC.
In step (6), the dead zone of dynamo governor and the dead zone of direct current frequency limiter FLC are worked in coordination, and are enabled
Dead_gov > dead_flc, direct current frequency limiter FLC start after the frequency of island-grid is more than its dead zone dead_flc.
The invention has the following beneficial technical effects:
The present invention sends out the system operation characteristic of isolated island for more direct currents, proposes a set of promoted based on dc power and refers to
It enables, direct current frequency limiter (FLC), dynamo governor primary frequency modulation, the steady secondary control means for cutting machine of control minute wheel, to isolated island electricity
Frequency under net catastrophe failure carries out emergent control.System frequency caused by monopole and bipolar DC locking failure can be increased
Control avoids largely cutting off the mating power supply of direct current, is a kind of efficient island-grid frequency control means in zone of reasonableness.
Detailed description of the invention
Fig. 1 show the flow diagram that the present invention sends out the frequency coordination control method of isolated island for more DC lines.
Fig. 2 show certain power grid Asynchronous Interconnection configuration of power network.
Fig. 3 show the embodiment of the present invention and the locking of B direct current monopole is occurring, and each DC control channel perfects isolated island in situation
The simulation result of mains frequency.
Fig. 4 show the embodiment of the present invention and the locking of B direct current monopole, isolated island in the case of A DC control channel interrupt is occurring
The simulation result of mains frequency.
Fig. 5 show the embodiment of the present invention and B DC bipolar block is occurring, and each DC control channel perfects isolated island in situation
The simulation result of mains frequency.
Specific embodiment
Technical solution of the present invention is further stated in detail with reference to the accompanying drawings of the specification.
A kind of frequency coordination control method for sending out isolated island for more DC lines, comprising the following steps:
(1) the realtime power value that every time DC line conveys in real time is obtained, according to the overload capacity of DC line, is calculated every
Return the watt level that DC line is capable of modulated in real time.Wherein, flexible DC transmission route is using 1.0p.u. overload as function
Rate adjusts the upper limit, and customary DC transmission line of electricity is using 1.2p.u. overload as the power regulation upper limit, wherein p.u. refers to often
Advise DC power transmission line or flexible DC transmission route rated power per unit value；
(2) judge whether every time DC line occurs monopole locking or bipolar locking, if so, (3) are thened follow the steps, it is no
Then, return step (1)；
(3) whether all normal judge the corresponding control channel of each time DC line, if so, (4) are thened follow the steps, otherwise,
It executes step (5)；
(4) all DC lines promote the dc power in all DC lines of instruction promotion using dc power, reduce
Island-grid unbalanced power amount, subsequently into step (6)；
Step (4) includes the following contents:
4.1, according to power before the failure for the DC line being latched, obtain island-grid unbalanced power amount Δ P；
4.2 are capable of the watt level of modulated in real time according to each DC line that step (1) obtains, the isolated island that needs are adjusted
What grid power amount of unbalance Δ P was averagely allocated to the DC line being latched operates normally the straight of pole and other normal operations
Flow Line.
(5) the normal DC line of control channel promotes the direct current function in instruction promotion DC line using dc power
Whether rate reduces island-grid unbalanced power amount, subsequently determines whether island-grid frequency variation Δ f in direct current frequency limiter
In the operating dead zone dead_flc of FLC, when island-grid frequency variation Δ f is dead greater than the movement of direct current frequency limiter FLC
When area dead_flc, then the DC line that control channel is interrupted carries out island-grid frequency using direct current frequency limiter FLC
It adjusts, subsequently into step (6)；When island-grid frequency variation Δ f is less than the operating dead zone of direct current frequency limiter FLC
When dead_flc, it is directly entered step (6)；
Wherein, the value range of dead_flc is (0.0Hz, 50.0Hz).And it preferably takes in the embodiment of the present application
0.1Hz。
Step (5) includes the following contents:
5.1, according to power before the failure for the DC line being latched, obtain island-grid unbalanced power amount Δ P；
5.2 are capable of the watt level of modulated in real time according to each DC line that step (1) obtains, the isolated island that needs are adjusted
Normal operation pole that grid power amount of unbalance Δ P is averagely allocated to the direct current being latched and other control channels are normally and just
The DC line often run；
If the active power of the normal DC line of 5.3 control channels is promoted, fail to control island-grid frequency straight
In the operating dead zone dead_flc for flowing frequency limit device (FLC), then the DC line for the normal operation interrupted using control channel
Direct current frequency limiter FLC island-grid frequency is adjusted.
(6) judge whether the frequency variation Δ f of island-grid is greater than the governor that frequency modulation machine group is participated in island-grid
Operating dead zone dead_gov, if it is, using dynamo governor carry out primary frequency modulation, subsequently into step (7)；Otherwise
Return step (1)；
Wherein, dead_gov value range is (0.0Hz, 50.0Hz), the preferred 0.15Hz of the embodiment of the present application.
In step (6), the dead zone of dynamo governor and the dead zone of direct current frequency limiter FLC are worked in coordination, and are enabled
Dead_gov > dead_flc, direct current frequency limiter FLC start after the frequency of island-grid is more than its dead zone dead_flc.
(7) judge whether island-grid frequency is cutting unit frequency threshold value freq_cut or more, if it is, starting safety
Stabilization control device, according to the control scheme list that off-line simulation is formulated, minute wheel time excision generating set；Otherwise, return step
(1)。
Wherein, freq_cut value range is (0.0Hz, 50.0Hz), the preferred 0.5Hz of the embodiment of the present application.
Illustrate the above method according to an embodiment of the present invention below with reference to Fig. 2~Fig. 5.
Fig. 2 shows certain power grid Asynchronous Interconnection configuration of power network.It establishes comprising including A direct current, B direct current, C direct current and D direct current
Simulation model.A direct current is the double back quadrupole customary DC of ± 500kV, rated active power 4*1600MW=6400MW；B is straight
Stream is the bipolar customary DC of ± 800kV, rated active power 2*2500MW=5000MW；C direct current is the bipolar normal of ± 800kV
Advise direct current, rated active power 2*2500MW=5000MW；D direct current is soft directly each one time with customary DC, voltage rating
320kV, rated active power 2000MW；Four direct currents are provided with direct current frequency limiter and power ascension/return in rectification side
Function drops, and direct current frequency limiter dead zone is 0.1Hz.The hydroelectric power plant 9 A direct current mating unit A1 machine, installed capacity 9*770=
6930MW；The hydroelectric power plant 4 B direct current mating unit B1 machine, the hydroelectric power plant 6 installed capacity 4*600=2400MW, B2 machine, installation
Capacity is 6*700=4200MW；The hydroelectric power plant 9 C direct current mating unit C1 machine, installed capacity 9*650MW=5850MW；Sending end
Grid side fired power generating unit model, total installation of generating capacity 12*600MW=7200MW.The frequency dead band of fired power generating unit and Hydropower Unit
It is set as 0.15Hz.
Monopole locking failure occurs when showing B dc power 5000MW for Fig. 3, and each DC control channel perfects lonely in situation
The simulation result of island mains frequency.After monopole locking occurs for B direct current, island-grid unbalanced power amount Δ P=2500MW.According to
For flexible DC transmission route using 1.0p.u. overload as the power regulation upper limit, customary DC transmission line of electricity uses 1.2p.u.
Overload as the power regulation upper limit, calculate A direct current at this time, C direct current, D direct current, B direct current non-faulting pole power-adjustable, benefit
The dc power in all DC lines is promoted with the power ascension instruction of DC line.After above-mentioned measure, island-grid
Frequency variation Δ f is less than the operating dead zone 0.15Hz of frequency modulation unit, and unit primary frequency modulation is not operating.Final mains frequency restores
To 49.95Hz.
Monopole locking failure, orphan in the case of A DC control channel interrupt occur when showing B dc power 5000MW for Fig. 4
The simulation result of island mains frequency.Monopole locking, island-grid unbalanced power amount Δ P=2500MW occur for B direct current.According to soft
Property DC power transmission line the power regulation upper limit is used as using 1.0p.u. overload, customary DC transmission line of electricity is using 1.2p.u. mistake
Load as the power regulation upper limit, calculate C direct current at this time, D direct current, B direct current non-faulting pole power-adjustable, utilize AC line
The power ascension instruction on road promotes the dc power in above-mentioned DC line.But the above measure fails to become island-grid frequency
Change amount Δ f is limited in the operating dead zone 0.1Hz of direct current frequency limiter (FLC), using A direct current frequency limiter FLC to orphan
Island mains frequency is adjusted.After above-mentioned measure, island-grid frequency variation Δ f is less than the operating dead zone of frequency modulation unit
0.15Hz, unit primary frequency modulation are not operating.Final mains frequency is restored to 50.1Hz.
Bipolar locking failure occurs when showing B dc power 5000MW for Fig. 5, and each DC control channel perfects lonely in situation
The simulation result of island mains frequency.Bipolar locking, island-grid unbalanced power amount Δ P=5000MW occur for B direct current.According to soft
Property DC power transmission line the power regulation upper limit is used as using 1.0p.u. overload, customary DC transmission line of electricity is using 1.2p.u. mistake
Load calculates the power-adjustable of A direct current, C direct current, D direct current at this time, utilizes the power of DC line as the power regulation upper limit
Promote the dc power in all DC lines of instruction promotion.After above-mentioned measure, island-grid frequency variation Δ f is still
Greater than the operating dead zone 0.15Hz of frequency modulation unit, primary frequency modulation is carried out using dynamo governor.After above-mentioned measure, isolated island
Mains frequency variation delta f, which is still greater than, cuts gate threshold value 0.5Hz, cuts off 3 generators of B2 power plant.Final mains frequency restores
To 50.1Hz.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope disclosed by the invention, any changes or substitutions that can be easily thought of by any people for being familiar with the technology, should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (5)
1. a kind of frequency coordination control method for sending out isolated island for more DC lines, which is characterized in that the frequency coordination control
Method processed the following steps are included:
(1) it obtains the realtime power value that every time DC line conveys in real time and every Hui Zhi is calculated according to the overload capacity of DC line
Flow Line is capable of the watt level of modulated in real time；
(2) it judges whether there is DC line and monopole locking or bipolar locking occurs, if so, thening follow the steps (3), otherwise, return
Step (1)；
(3) whether all normal judge the corresponding control channel of each time DC line, if so, thening follow the steps (4), otherwise, execute
Step (5)；
(4) all DC lines promote the dc power in all DC lines of instruction promotion using dc power, reduce isolated island
Grid power amount of unbalance, subsequently into step (6)；
(5) the normal DC line of control channel promotes the dc power in instruction promotion DC line using dc power, subtracts
Whether few island-grid unbalanced power amount, subsequently determine whether island-grid frequency variation Δ f direct current frequency limiter FLC's
In the dead_flc of operating dead zone, when island-grid frequency variation Δ f is greater than the operating dead zone of direct current frequency limiter FLC
When dead_flc, then the DC line that control channel is interrupted adjusts island-grid frequency using direct current frequency limiter FLC
Section, subsequently into step (6)；When island-grid frequency variation Δ f is less than the operating dead zone of direct current frequency limiter FLC
When dead_flc, it is directly entered step (6)；
(6) judge whether the frequency variation Δ f of island-grid is greater than the operating dead zone dead_gov of dynamo governor, if
It is then primary frequency modulation to be carried out using dynamo governor, subsequently into step (7)；Otherwise return step (1)；
(7) judge whether island-grid frequency is cutting unit frequency threshold value freq_cut or more, if it is, starting safety and stability
Control device, according to the control scheme list that off-line simulation is formulated, minute wheel time excision generating set；Otherwise, return step (1).
2. the frequency coordination control method according to claim 1 for sending out isolated island for more DC lines, it is characterised in that:
In step (1), for flexible DC transmission route using 1.0p.u. overload as the power regulation upper limit, customary DC is defeated
Electric line is using 1.2p.u. overload as the power regulation upper limit, wherein p.u. refers to customary DC transmission line of electricity or flexible straight
Flow transmission line of electricity rated power per unit value.
3. the frequency coordination control method according to claim 1 for sending out isolated island for more DC lines, it is characterised in that:
Step (4) includes the following contents:
4.1, according to power before the failure for the DC line being latched, obtain island-grid unbalanced power amount Δ P；
4.2 are capable of the watt level of modulated in real time according to each DC line that step (1) obtains, the island-grid that needs are adjusted
Unbalanced power amount Δ P is averagely allocated to the AC line of the normal operation pole and other normal operations for the DC line being latched
Road.
4. the frequency coordination control method according to claim 1 for sending out isolated island for more DC lines, it is characterised in that:
Step (5) includes the following contents:
5.1, according to power before the failure for the DC line being latched, obtain island-grid unbalanced power amount Δ P；
5.2 are capable of the watt level of modulated in real time according to each DC line that step (1) obtains, the island-grid that needs are adjusted
Unbalanced power amount Δ P is averagely allocated to the normal operation pole for the direct current being latched and other control channels normally and are normally transported
Capable DC line；
If the active power of the normal DC line of 5.3 control channels is promoted, fail to control island-grid frequency in direct current frequency
In the operating dead zone dead_flc of rate limiter FLC, then the direct current of the DC line for the normal operation interrupted using control channel
Island-grid frequency is adjusted in frequency limit device FLC.
5. the frequency coordination control method according to claim 1 for sending out isolated island for more DC lines, it is characterised in that:
In step (6), the dead zone of dynamo governor and the dead zone of direct current frequency limiter FLC are worked in coordination, and enable dead_
Gov > dead_flc, direct current frequency limiter FLC start after the frequency of island-grid is more than its dead zone dead_flc.
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| CN107565594B (en) * | 2017-10-17 | 2020-10-30 | 北京四方继保自动化股份有限公司 | Multi-DC-to-DC power boost distribution method considering influence of terminal voltage deviation |
| CN107658897A (en) * | 2017-10-18 | 2018-02-02 | 广东电网有限责任公司电力调度控制中心 | A kind of more direct current frequency limiters based on permanent order regulation |
| CN107769226A (en) * | 2017-10-25 | 2018-03-06 | 贵州电网有限责任公司电力调度控制中心 | A kind of mains frequency control method based on mixed DC feed-in |
| CN108631336B (en) * | 2018-05-15 | 2021-09-28 | 南瑞集团有限公司 | Control method for improving frequency stability in flexible direct and near region island forming process |
| CN110380454B (en) * | 2019-07-17 | 2021-02-23 | 南瑞集团有限公司 | Multi-power-supply coordination control method for restraining transient high frequency of VSC-HVDC (Voltage Source converter-high Voltage direct Current) transmission end island system |
| CN110460096B (en) * | 2019-08-07 | 2021-12-03 | 国网山东省电力公司电力科学研究院 | Fault ride-through control method and device for new energy island flexible direct-sending system |
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