CN105552897B - Direct current isolated island sends out electric grid secondary frequency modulation spare capacity collocation method - Google Patents
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
-
- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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Abstract
A kind of direct current isolated island sends out electric grid secondary frequency modulation spare capacity collocation method, including：Exit direct current isolated island and send out power network FLC functions；Calculate under the conditions of power shortage maximum Δ P1 caused by the failures of power network N 1 is sent out, mains frequency recovers the primary frequency modulation spare capacity P1 1 that to primary frequency modulation control targe F1, need to be reserved；Calculate under the conditions of power shortage Δ P1, mains frequency recovers to frequency modulation frequency modulation control targe F2, on the basis of P1 1, need to increase reserved frequency modulation frequency modulation spare capacity P1 2；Calculate under the conditions of power shortage maximum Δ P2 caused by the failures of N 2, mains frequency recovers to F1, required reserved primary frequency modulation spare capacity P2 1；Calculate under the conditions of power shortage Δ P2, mains frequency recovers to F2, and power network need to increase reserved frequency modulation frequency modulation spare capacity P2 2 on the basis of P2 1；Put into FLC functions；Calculate under the conditions of power shortage Δ P2, mains frequency recovers to revert to 0 before frequency modulation frequency modulation action to F2, FLC DC power modulations amount, the frequency modulation frequency modulation spare capacity P3 2 that need to be reserved.
Description
Technical field
Present invention relates in general to electrical network field, and it is standby to send out electric grid secondary frequency modulation more particularly, to a kind of direct current isolated island
Use capacity collocation method.
Background technology
Frequency stabilization is the important content of power system security stable operation, configures rational spare capacity, is to ensure electricity
The important measures of net frequency stabilization.Secondary spare capacity is system AGC (AUTOMATIC GENERATION CONTROL) capacity,
Reasonable disposition secondary system capacity, the effect of AGC frequency modulation frequency modulations is given full play to, coordinate primary frequency modulation and three times frequency modulation, so as to common
The frequency quality of guarantee system.
For frequency modulation frequency modulation spare capacity allocation problem, there is no the theoretical calculation method of maturation in world wide, typically all
It is empirically, it is specified that frequency modulation frequency modulation capacity is a certain ratio of system total installed capacity or load, such as the 2%- of system peak load
5%, big system gets the small value, and mini system takes large values.In addition, also two thinkings be respectively based on electricity market consider economy and
Frequency modulation frequency modulation spare capacity collocation method based on historical datas such as each type load, mains frequency examination parameters.
For example, certain domestic electric grid secondary frequency modulation standby configuration method is：
1st, the standby minimum value of the whole network load is the 2% of the whole network peak load；
2nd, determine primary frequency modulation target and to obtain primary frequency modulation standby；
3rd, standby for load, standby to subtract primary frequency modulation standby for frequency modulation frequency modulation；
During the present invention is realized, it is found by the applicant that following technological deficiency be present in above-mentioned prior art：
(1) when determining the standby minimum value of the whole network load, empirically, using the 2% of the whole network peak load, need subsequently a large amount of
Calculate and verify its reasonability；
(2) frequency modulation frequency modulation it is standby be by the standby minimum value of the whole network load deduct primary frequency modulation it is standby after obtain, if energy
Enough meet that frequency modulation frequency modulation target can not determine；
(3) when configuring frequency modulation frequency modulation capacity, system rack architectural characteristic is not considered.
The content of the invention
The invention provides a kind of direct current isolated island to send out electric grid secondary frequency modulation spare capacity collocation method, it is characterised in that
This method comprises the following steps：
It is F1 that step 1, clear and definite direct current isolated island, which send out primary frequency regulation of power network control targe, and frequency modulation frequency modulation control targe is F2；
Power shortage maximum caused by step 2, clear and definite direct current isolated island submitting power network N-1 failures is Δ P1；N-2 failures are drawn
The power shortage maximum risen is Δ P2；
If step 3, direct current isolated island send out power network acquiescence input direct current frequency limitation control FLC functions, the work(is exited
Can, otherwise ignore step 3；
Step 4, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1, direct current isolated island sends out electricity
Net frequency retrieval to F1, direct current isolated island sends out the primary frequency modulation spare capacity P1-1 reserved needed for power network；
Step 5, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1, direct current isolated island sends out electricity
For net frequency retrieval to F2, direct current isolated island sends out power network on the basis of P1-1, also needs the reserved frequency modulation frequency modulation spare capacity P1- of increase
2；
Step 6, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out electricity
Net frequency retrieval to F1, direct current isolated island sends out the primary frequency modulation spare capacity P2-1 reserved needed for power network；
Step 7, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out electricity
For net frequency retrieval to F2, direct current isolated island sends out power network on the basis of P2-1, also needs the reserved frequency modulation frequency modulation spare capacity P2- of increase
2；
Step 8, input direct current isolated island send out power network FLC functions；
Step 9, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out electricity
Net frequency retrieval is to F2, and FLC DC power modulations amount reverts to 0 before frequency modulation frequency modulation action, and direct current isolated island sends out power network institute
The frequency modulation frequency modulation spare capacity P3-2 that need to be reserved；
Step 10, P1-2 and P2-2 are that direct current isolated island sends out power network without can resist N-1 and N-2 failures in the case of FLC
Two-stage frequency modulation frequency modulation spare capacity configuration, P3-2 be direct current isolated island send out power network configuration FLC under can resist N-2 failures
Frequency modulation frequency modulation spare capacity configures.
Alternatively, in the step 1, F1 is determined by following principle, that is, after being disturbed, direct current isolated island sends out mains frequency
Recover to 50 ± 0.2HZ；F2 is determined by following principle, that is, after being disturbed, direct current isolated island send out mains frequency recover to 50 ±
0.1HZ。
Brief description of the drawings
For a more complete understanding of the present invention and its advantage, referring now to the following description with reference to accompanying drawing, wherein：
Fig. 1 shows that stream isolated island according to embodiments of the present invention sends out electric grid secondary frequency modulation spare capacity collocation method flow
Figure.
Fig. 2 shows south electric network Asynchronous Interconnection configuration of power network.
Fig. 3 is shown meets F1 targets Yunnan orphan under the conditions of power shortage Δ P1 (700MW) according to embodiments of the present invention
Send mains frequency recovery situation outside in island.
Fig. 4 is shown meets F2 targets Yunnan orphan under the conditions of power shortage Δ P1 (700MW) according to embodiments of the present invention
Send mains frequency recovery situation outside in island.
Fig. 5 is shown meets F1 targets Yunnan orphan under the conditions of power shortage Δ P2 (3000MW) according to embodiments of the present invention
Send mains frequency recovery situation outside in island.
Fig. 6 is shown meets F2 targets Yunnan orphan under the conditions of power shortage Δ P2 (3000MW) according to embodiments of the present invention
Send mains frequency recovery situation outside in island.
Fig. 7 is shown meets F2 targets Yunnan orphan under the conditions of power shortage Δ P2 (3000MW) according to embodiments of the present invention
Send mains frequency recovery situation outside in island.
Fig. 8 is shown meets each direct current of F2 targets under the conditions of power shortage Δ P2 (3000MW) according to embodiments of the present invention
FLC DC power modulations amount acts situation.
Embodiment
According to reference to accompanying drawing to the described in detail below of exemplary embodiment of the present, other side of the invention, advantage
It is will become obvious with prominent features for those skilled in the art.
In the present invention, term " comprising " and " containing " and its derivative mean including and it is unrestricted；Term "or" is bag
Containing property, mean and/or.
In this manual, following various embodiments for being used to describe the principle of the invention simply illustrate, should not be with any
Mode is construed to the scope of limitation invention.Referring to the drawings described below is used to help comprehensive understanding by claim and its equivalent
The exemplary embodiment of the invention that thing limits.It is described below to help to understand including a variety of details, but these details should
Think what is be merely exemplary.Therefore, it will be appreciated by those of ordinary skill in the art that without departing substantially from scope and spirit of the present invention
In the case of, embodiment described herein can be made various changes and modifications.In addition, for clarity and brevity,
Eliminate the description of known function and structure.In addition, running through accompanying drawing, same reference numbers are used for identity function and operation.
Fig. 1 shows that the direct current isolated island of the present invention sends out electric grid secondary frequency modulation spare capacity collocation method flow chart.
As shown in figure 1, direct current isolated island according to embodiments of the present invention sends out electric grid secondary frequency modulation spare capacity collocation method
Comprise the following steps：
It is F1 that step 1, clear and definite direct current isolated island, which send out primary frequency regulation of power network control targe, and frequency modulation frequency modulation control targe is F2；
Power shortage maximum caused by step 2, clear and definite direct current isolated island submitting power network N-1 failures is Δ P1；N-2 failures are drawn
The power shortage maximum risen is Δ P2；
If step 3, direct current isolated island send out power network acquiescence input direct current frequency limitation control FLC functions, the work(is exited
Can, otherwise ignore step 3；
Step 4, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1, direct current isolated island sends out electricity
Net frequency retrieval to F1, direct current isolated island sends out the primary frequency modulation spare capacity P1-1 reserved needed for power network；
Step 5, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1, direct current isolated island sends out electricity
For net frequency retrieval to F2, direct current isolated island sends out power network on the basis of P1-1, also needs the reserved frequency modulation frequency modulation spare capacity P1- of increase
2；
Step 6, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out electricity
Net frequency retrieval to F1, direct current isolated island sends out the primary frequency modulation spare capacity P2-1 reserved needed for power network；
Step 7, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out electricity
For net frequency retrieval to F2, direct current isolated island sends out power network on the basis of P2-1, also needs the reserved frequency modulation frequency modulation spare capacity P2- of increase
2；
Step 8, input direct current isolated island send out power network FLC functions；
Step 9, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out electricity
Net frequency retrieval is to F2, and FLC DC power modulations amount reverts to 0 before frequency modulation frequency modulation action, and direct current isolated island sends out power network institute
The frequency modulation frequency modulation spare capacity P3-2 that need to be reserved；
Step 10, P1-2 and P2-2 are that direct current isolated island sends out power network without can resist N-1 and N-2 failures in the case of FLC
Two-stage frequency modulation frequency modulation spare capacity configuration, P3-2 be direct current isolated island send out power network configuration FLC under can resist N-2 failures
Frequency modulation frequency modulation spare capacity configures.
Alternatively, in the step 1, F1 is determined by following principle, that is, after being disturbed, direct current isolated island sends out mains frequency
Recover to 50 ± 0.2HZ；F2 is determined by following principle, that is, after being disturbed, direct current isolated island send out mains frequency recover to 50 ±
0.1HZ。
Above-mentioned full dynamic simulation program is PSD-FDS (FULL DYNAMIC SIMULATION PROGRAM), can
Power system electromechanics transient state, medium and long term dynamic process are organically united and emulated, power system can be simulated
Whole continuous dynamic process after being disturbed.
Illustrate the above method according to embodiments of the present invention below with reference to Fig. 2~Fig. 8.Fig. 2 shows that south electric network is asynchronous
Networking configuration of power network.By taking the Yunnan Power System of south electric network Asynchronous Interconnection as an example, establish Yunnan Power System and pass through Chu Sui direct currents, general emigrant
Direct current, ox are from direct current, rich direct current and western Shandong back-to-back DC is the same as southern host's net (Guangdong, Guangxi, Guizhou, sea forever in direct current, gold
South) asynchronous interconnected operation mode, 6 times direct currents send electricity outside and amount to 21150MW, and direct current FLC functions frequency dead band limitation scope is
0.3HZ.And large sized unit is more in the net of Yunnan, offer frequency support is netted there is no southern host, and frequency stabilization problem turns into most
Main stable problem, need reasonable disposition frequency modulation frequency modulation standby.
In step 1, it is F1 to specify direct current isolated island submitting primary frequency regulation of power network control targe, and frequency modulation frequency modulation control targe is
F2.According to embodiments of the present invention, F1 is determined by following principle, that is, after being disturbed, direct current isolated island send out mains frequency recover to
50±0.2HZ.F2 is determined by following principle, that is, after being disturbed, direct current isolated island is sent out mains frequency and recovered to 50 ± 0.1HZ.
In step 2, specify direct current isolated island send out power network N-1 failures caused by power shortage maximum be Δ P1；N-2 failures
Caused power shortage maximum is Δ P2.Yunnan Power System N-1 disturbances are combed comprehensively, and maximum N-1 disturbances cross 700MW machines for small stream Lip river
Group trips at full capacity, therefore Δ P1 is 700MW；Maximum N-2 disturbances are kwan-yin rock power plant egress line failure, and the failure may be led
5 600MW units of grid loss are caused, therefore Δ P2 is 3000MW.
In step 3, if direct current isolated island sends out power network acquiescence input direct current frequency limitation control FLC functions, this is exited
Function, otherwise ignore step 3.
In step 4, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1 (700MW), direct current is lonely
Send out mains frequency and recover to send out the primary frequency modulation spare capacity P1-1 reserved needed for power network to F1 (49.8HZ), direct current isolated island in island
For 370MW, whole process simulation result is as shown in figure 3, illustrated therein is according to embodiments of the present invention in power shortage Δ P1
Meet that F1 targets Yunnan isolated island sends mains frequency recovery situation outside under the conditions of (700MW).
In step 5, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1, direct current isolated island is sent out
Mains frequency recovers to F2 (49.9HZ), and direct current isolated island sends out power network on the basis of P1-1, also needs the reserved frequency modulation frequency modulation of increase
Spare capacity P1-2 is 200MW, and whole process simulation result is as shown in figure 4, illustrated therein is according to embodiments of the present invention in power
Meet that F2 targets Yunnan isolated island sends mains frequency recovery situation outside under the conditions of vacancy Δ P1 (700MW).
In step 6, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2 (3000MW), direct current
Isolated island sends out mains frequency and recovers to send out the primary frequency modulation spare capacity reserved needed for power network to F1 (49.8HZ), direct current isolated island
P2-1 (3000MW), whole process simulation result is as shown in figure 5, illustrated therein is according to embodiments of the present invention in power shortage Δ P2
Meet that F1 targets Yunnan isolated island sends mains frequency recovery situation outside under the conditions of (3000MW).As seen from the figure, Yunnan isolated island sends out electricity
Net frequency intelligent restoration is to 49.75HZ, because unit primary frequency modulation is droop control, Yunnan isolated island sends out power network once
Frequency modulation characteristic inherent characteristic can only make frequency retrieval to 49.75HZ, primary frequency modulation it is standby more than more than 3000MW to quasi-steady state frequency
The more preferable effect that will not have is played in the recovery of rate, therefore it is that P2-1 is that 3000MW is rational to configure primary frequency modulation spare capacity.
In step 7, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island is sent out
Mains frequency recovers to F2, and direct current isolated island sends out power network on the basis of P2-1, also needs the reserved frequency modulation frequency modulation spare capacity of increase
P2-2 is 1800MW, and whole process simulation result is as shown in fig. 6, illustrated therein is according to embodiments of the present invention in power shortage Δ P2
Meet that F2 targets Yunnan isolated island sends mains frequency recovery situation outside under the conditions of (3000MW).
In step 8, input direct current isolated island sends out power network FLC functions.
In step 9, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island is sent out
Mains frequency recovers to F2, and FLC DC power modulations amount reverts to 0 before frequency modulation frequency modulation action, and direct current isolated island sends out power network
Required reserved frequency modulation frequency modulation spare capacity P3-2 is 1800MW, and whole process simulation result is as shown in fig. 7, illustrated therein is basis
The embodiment of the present invention meets that F2 targets Yunnan isolated island sends mains frequency outside and recovers feelings under the conditions of power shortage Δ P2 (3000MW)
Condition.Fig. 8 is shown meets that each direct current FLC of F2 targets is straight under the conditions of power shortage Δ P2 (3000MW) according to embodiments of the present invention
Algorithm for power modulation amount action situation is flowed, before frequency modulation frequency modulation action (180 seconds), each direct current FLC DC power modulation amounts revert to 0.
In step 10, P1-2 (200MW) and P2-2 (1800MW) are that direct current isolated island submitting power network can resist N-1 and N-
The two-stage frequency modulation frequency modulation spare capacity configuration of 2 failures, P3-2 are that can resist N-2 under direct current isolated island submitting power network configuration FLC
The frequency modulation frequency modulation spare capacity configuration of failure.
The present invention has following one or more beneficial effects：
(1) scheme is it is determined that during the standby minimum value of the whole network load in the past, empirically, using a certain of the whole network peak load
Ratio (2%-8%), subsequently a large amount of calculating are needed to verify its reasonability.Using the technical program, by power transmission outside direct current isolated island
Net mode is analyzed, and is found out the maximum power shortage of N-1, N-2, in this, as the rational failure of checkschema, can be mitigated meter
Calculation amount.
(2) in the past scheme frequency modulation frequency modulation it is standby be by deducted in the standby minimum value of the whole network load primary frequency modulation it is standby after
Arrive, if disclosure satisfy that frequency modulation frequency modulation target can not determine.Using the technical program, set up F2 standards and carry out target to assess direct current
Isolated island sends out electric grid secondary frequency modulation situation, it can be ensured that gained frequency modulation frequency modulation spare capacity disclosure satisfy that frequency modulation frequency modulation requirement.
(3) scheme when configuring frequency modulation frequency modulation capacity, does not consider system rack architectural characteristic in the past.Using this technology side
Case, it is contemplated that direct current isolated island sends out the influence after power network configuration FLC.
Although the present invention, art technology has shown and described with reference to the certain exemplary embodiments of the present invention
Personnel it should be understood that without departing substantially from appended claims and its equivalent restriction the spirit and scope of the present invention in the case of,
Can be to a variety of changes in carry out form and details of the present invention.Therefore, the scope of the present invention should not necessarily be limited by above-described embodiment,
But not only should be determined by appended claims, also it is defined by the equivalent of appended claims.
Claims (2)
1. a kind of direct current isolated island sends out electric grid secondary frequency modulation spare capacity collocation method, it is characterised in that this method includes as follows
Step：
It is F1 that step 1, clear and definite direct current isolated island, which send out primary frequency regulation of power network control targe, and frequency modulation frequency modulation control targe is F2；
Power shortage maximum caused by step 2, clear and definite direct current isolated island submitting power network N-1 failures is Δ P1；Caused by N-2 failures
Power shortage maximum is Δ P2；
If step 3, direct current isolated island send out power network acquiescence input direct current frequency limitation control FLC functions, the function is exited, it is no
Then ignore step 3；
Step 4, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1, direct current isolated island sends out power network frequency
Rate is recovered to send out the primary frequency modulation spare capacity P1-1 reserved needed for power network to F1, direct current isolated island；
Step 5, using full dynamic simulation program, calculate under the conditions of power shortage Δ P1, direct current isolated island sends out power network frequency
Rate is recovered to F2, and direct current isolated island sends out power network on the basis of P1-1, also needs the reserved frequency modulation frequency modulation spare capacity P1-2 of increase；
Step 6, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out power network frequency
Rate is recovered to send out the primary frequency modulation spare capacity P2-1 reserved needed for power network to F1, direct current isolated island；
Step 7, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out power network frequency
Rate is recovered to F2, and direct current isolated island sends out power network on the basis of P2-1, also needs the reserved frequency modulation frequency modulation spare capacity P2-2 of increase；
Step 8, input direct current isolated island send out power network FLC functions；
Step 9, using full dynamic simulation program, calculate under the conditions of power shortage Δ P2, direct current isolated island sends out power network frequency
Rate is recovered to F2, and FLC DC power modulations amount reverts to 0 before frequency modulation frequency modulation action, and direct current isolated island is sent out pre- needed for power network
The frequency modulation frequency modulation spare capacity P3-2 stayed；
Step 10, P1-2 and P2-2 are that direct current isolated island sends out power network without can resist the two of N-1 and N-2 failures in the case of FLC
The spare capacity configuration of level frequency modulation frequency modulation, P3-2 are that can resist the secondary of N-2 failures under direct current isolated island submitting power network configuration FLC
Frequency modulation spare capacity configures.
2. the method as described in claim 1, it is characterised in that：
In the step 1, F1 is determined by following principle, that is, after being disturbed, direct current isolated island send out mains frequency recover to 50 ±
0.2HZ；
F2 is determined by following principle, that is, after being disturbed, direct current isolated island is sent out mains frequency and recovered to 50 ± 0.1HZ.
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| CN106655260B (en) * | 2016-11-15 | 2019-04-09 | 许继集团有限公司 | A kind of micro-capacitance sensor and its grid-connected leave net seamless handover method |
| CN106953363B (en) * | 2017-05-04 | 2019-06-04 | 西南交通大学 | Power grid spinning reserve Optimal Configuration Method under a kind of wind power plant limit power operating states |
| CN112039092A (en) * | 2020-09-23 | 2020-12-04 | 华北电力大学 | Island Direct Current (DC) outgoing Automatic Gain Control (AGC) model prediction control method considering energy storage System On Chip (SOC) recovery |
| CN113422377B (en) * | 2021-08-25 | 2021-11-09 | 中国电力科学研究院有限公司 | DC modulation and secondary frequency modulation coordinated optimization configuration method and device |
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| CN102680858A (en) * | 2012-05-30 | 2012-09-19 | 陕西长岭光伏电气有限公司 | Detection method for islanding effect of grid-connected inverter |
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| Title |
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| Simulation and dynamic control of a hybrid system for controlling the voltage and frequency of an island network;Behrooz Ghahremani, et al;《Electric Power and Energy Conversion Systems (EPECS), 2013 3rd International Conference on》;20131004;1-6 * |
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