CN105552897A - Configuration method for secondary frequency modulation reserve capacity of direct current islanded sending power grid - Google Patents
Configuration method for secondary frequency modulation reserve capacity of direct current islanded sending power grid Download PDFInfo
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- CN105552897A CN105552897A CN201511028203.2A CN201511028203A CN105552897A CN 105552897 A CN105552897 A CN 105552897A CN 201511028203 A CN201511028203 A CN 201511028203A CN 105552897 A CN105552897 A CN 105552897A
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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
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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
- H02J3/38—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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- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a configuration method for secondary frequency modulation reserve capacity of a direct current islanded sending power grid, comprising: quitting the FLC function of the direct current islanded sending power grid; under the condition of maximum power shortage delta P1 resulted from the N-1 fault of the sending power grid, calculating primary frequency modulation reserve capacity P1-1 needed to be reserved for recovering the power grid frequency to a primary frequency modulation control objective F1; under the condition of power shortage delta P1, calculating the secondary frequency modulation reserve capacity P1-2 needed to be reserved on the basis of the P1-1 for recovering the power grid frequency to a secondary frequency modulation control objective F2; under the condition of maximum power shortage delta P2 resulted from the N-2 fault of the sending power grid, calculating primary frequency modulation reserve capacity P2-1 needed to be reserved for recovering the power grid frequency to the F1; under the condition of power shortage delta P2, calculating second frequency modulation reserve capacity P2-2 of the system on the basis of the P2-1 needed to be reserved for recovering the power grid frequency to the F2; injecting the FLC function; under the condition of power shortage delta P2, calculating secondary frequency modulation reserve capacity P3-2 needed to be reserved for recovering the power grid frequency to the F2 and recovering the FLC direct current power modulation quantity to 0 before the secondary frequency modulation action.
Description
Technical field
Present invention relates in general to electrical network field, more specifically, relate to a kind of direct current isolated island and send electric grid secondary frequency modulation reserve capacity collocation method.
Background technology
Frequency stabilization is the important content that power system safety and stability runs, and configures rational reserve capacity, is the important measures ensureing that mains frequency is stable.Secondary reserve capacity and system AGC (AUTOMATICGENERATIONCONTROL) capacity, reasonable disposition secondary system capacity, gives full play to the effect of AGC frequency modulation frequency modulation, coordinates primary frequency modulation and three frequency modulation, thus the frequency quality of common guarantee system.
For frequency modulation frequency modulation reserve capacity allocation problem, not having ripe theoretical calculation method in world wide, is all generally empirically, regulation frequency modulation frequency modulation capacity is a certain ratio of system total installed capacity or load, as the 2%-5% of system peak load, Iarge-scale system gets the small value, and mini system takes large values.In addition, also have two thinkings to be respectively and consider economy and the frequency modulation frequency modulation reserve capacity collocation method based on historical datas such as each type load, mains frequency examination parameters based on electricity market.
Such as, certain electric grid secondary frequency modulation standby configuration method domestic is:
1, the whole network load minimum value for subsequent use is 2% of the whole network peak load;
2, primary frequency modulation target is determined and to obtain primary frequency modulation for subsequent use;
3, frequency modulation frequency modulation is for subsequent use is that the load primary frequency modulation that deducts for subsequent use is for subsequent use;
Realizing in process of the present invention, applicant finds that above-mentioned prior art exists following technological deficiency:
(1) when determining the whole network load minimum value for subsequent use, empirically, adopt 2% of the whole network peak load, need follow-up its reasonability of a large amount of calculation check;
(2) frequency modulation frequency modulation is for subsequent use be by deduct in the whole network load minimum value for subsequent use primary frequency modulation for subsequent use after obtain, whether can meet frequency modulation frequency modulation target cannot determine;
(3) when configuring frequency modulation frequency modulation capacity, system network shelf structure characteristic is not considered.
Summary of the invention
The invention provides a kind of direct current isolated island and send electric grid secondary frequency modulation reserve capacity collocation method, it is characterized in that, the method comprises the steps:
It is F1 that step 1, clear and definite direct current isolated island send primary frequency regulation of power network control objectives, and frequency modulation frequency modulation control objectives is F2;
It is Δ P1 that step 2, clear and definite direct current isolated island send the power shortage maximum that electrical network N-1 fault causes; The power shortage maximum that N-2 fault causes is Δ P2;
If electrical network acquiescence of sending step 3 direct current isolated island drops into direct current frequency restriction control FLC function, then exit this function, otherwise omit step 3;
Step 4, adopt full dynamic simulation program, calculate under power shortage Δ P1 condition, island-grid frequency retrieval to F1, the required reserved primary frequency modulation reserve capacity P1-1 of system;
Step 5, employing full dynamic simulation program, calculate under power shortage Δ P1 condition, and island-grid frequency retrieval is to F2, and system, on P1-1 basis, also needs to increase reserved frequency modulation frequency modulation reserve capacity P1-2;
Step 6, adopt full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval to F1, the required reserved primary frequency modulation reserve capacity P2-1 of system;
Step 7, employing full dynamic simulation program, calculate under power shortage Δ P2 condition, and island-grid frequency retrieval is to F2, and system, on P2-1 basis, also needs to increase reserved frequency modulation frequency modulation reserve capacity P2-2;
Step 8, input direct current isolated island send electrical network FLC function;
Step 9, employing full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval is to F2, and FLC DC power modulation amount reverts to 0 before frequency modulation frequency modulation action, the required reserved frequency modulation frequency modulation reserve capacity P3-2 of system;
Step 10, P1-2 and P2-2 are direct current isolated island transmitting system without the two-stage frequency modulation frequency modulation reserve capacity configuration can resisting N-1 and N-2 fault in FLC situation, and P3-2 can resist the frequency modulation frequency modulation reserve capacity configuration of N-2 fault under being direct current isolated island transmitting system configuration FLC.
Alternatively, in described step 1, F1 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.2HZ; F2 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.1HZ.
Accompanying drawing explanation
In order to more completely understand the present invention and advantage thereof, referring now to following description by reference to the accompanying drawings, wherein:
Fig. 1 shows and sends electric grid secondary frequency modulation reserve capacity collocation method flow chart according to the stream isolated island of the embodiment of the present invention.
Fig. 2 shows south electric network Asynchronous Interconnection configuration of power network.
Fig. 3 shows and under power shortage Δ P1 (700MW) condition, meets F1 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
Fig. 4 shows and under power shortage Δ P1 (700MW) condition, meets F2 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
Fig. 5 shows and under power shortage Δ P2 (3000MW) condition, meets F1 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
Fig. 6 shows and under power shortage Δ P2 (3000MW) condition, meets F2 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
Fig. 7 shows and under power shortage Δ P2 (3000MW) condition, meets F2 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
Fig. 8 shows and under power shortage Δ P2 (3000MW) condition, meets F2 target each direct current FLC DC power modulation amount action situation according to the embodiment of the present invention.
Embodiment
According to by reference to the accompanying drawings to the following detailed description of exemplary embodiment of the present, other side of the present invention, advantage and prominent features will become apparent for those skilled in the art.
In the present invention, term " comprises " and " containing " and derivative thereof mean and to comprise and unrestricted; Term "or" is inclusive, mean and/or.
In this manual, the following various embodiments for describing the principle of the invention just illustrate, should not be interpreted as by any way limiting scope of invention.With reference to the following description of accompanying drawing for helping complete understanding by the exemplary embodiment of the present invention of claim and equivalents thereof.Following description comprises multiple detail and helps understand, but these details should think it is only exemplary.Therefore, those of ordinary skill in the art it should be understood that when not deviating from scope and spirit of the present invention, can carry out multiple change and amendment to embodiment described herein.In addition, for clarity and brevity, the description of known function and structure is eliminated.In addition, run through accompanying drawing, same reference numbers is used for identity function and operation.
Fig. 1 shows direct current isolated island of the present invention and sends electric grid secondary frequency modulation reserve capacity collocation method flow chart.
As shown in Figure 1, send electric grid secondary frequency modulation reserve capacity collocation method according to the direct current isolated island of the embodiment of the present invention to comprise the steps:
It is F1 that step 1, clear and definite direct current isolated island send primary frequency regulation of power network control objectives, and frequency modulation frequency modulation control objectives is F2;
It is Δ P1 that step 2, clear and definite direct current isolated island send the power shortage maximum that electrical network N-1 fault causes; The power shortage maximum that N-2 fault causes is Δ P2;
If electrical network acquiescence of sending step 3 direct current isolated island drops into direct current frequency restriction control FLC function, then exit this function, otherwise omit step 3;
Step 4, adopt full dynamic simulation program, calculate under power shortage Δ P1 condition, island-grid frequency retrieval to F1, the required reserved primary frequency modulation reserve capacity P1-1 of system;
Step 5, employing full dynamic simulation program, calculate under power shortage Δ P1 condition, and island-grid frequency retrieval is to F2, and system, on P1-1 basis, also needs to increase reserved frequency modulation frequency modulation reserve capacity P1-2;
Step 6, adopt full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval to F1, the required reserved primary frequency modulation reserve capacity P2-1 of system;
Step 7, employing full dynamic simulation program, calculate under power shortage Δ P2 condition, and island-grid frequency retrieval is to F2, and system, on P2-1 basis, also needs to increase reserved frequency modulation frequency modulation reserve capacity P2-2;
Step 8, input direct current isolated island send electrical network FLC function;
Step 9, employing full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval is to F2, and FLC DC power modulation amount reverts to 0 before frequency modulation frequency modulation action, the required reserved frequency modulation frequency modulation reserve capacity P3-2 of system;
Step 10, P1-2 and P2-2 are direct current isolated island transmitting system without the two-stage frequency modulation frequency modulation reserve capacity configuration can resisting N-1 and N-2 fault in FLC situation, and P3-2 can resist the frequency modulation frequency modulation reserve capacity configuration of N-2 fault under being direct current isolated island transmitting system configuration FLC.
Alternatively, in described step 1, F1 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.2HZ; F2 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.1HZ.
Above-mentioned full dynamic simulation program and PSD-FDS (FULLDYNAMICSIMULATIONPROGRAM), dynamo-electric for electric power system transient state, medium and long term dynamic process organically can be united and are emulated, can analog electrical Force system be disturbed after whole continuous print dynamic process.
Below with reference to Fig. 2 ~ Fig. 8, the said method according to the embodiment of the present invention is described.Fig. 2 shows south electric network Asynchronous Interconnection configuration of power network.For the Yunnan Power System of south electric network Asynchronous Interconnection, set up Yunnan Power System by direct current in Chu Sui direct current, general emigrant's direct current, gold, ox from direct current, forever rich direct current and western Shandong back-to-back DC with southern host's net (Guangdong, Guangxi, Guizhou, Hainan) asynchronous interconnected operation mode, 6 times direct currents are sent electricity outside and are amounted to 21150MW, and direct current FLC function frequency dead band limited field is 0.3HZ.And in the net of Yunnan large sized unit many, no longer include southern host's net and provide frequency to support, frequency stabilization problem becomes topmost stable problem, needs reasonable disposition frequency modulation frequency modulation for subsequent use.
In step 1, specifying direct current isolated island, to send primary frequency regulation of power network control objectives be F1, and frequency modulation frequency modulation control objectives is F2.According to the embodiment of the present invention, F1 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.2HZ.F2 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.1HZ.
In step 2, specifying direct current isolated island, to send the power shortage maximum that electrical network N-1 fault causes be Δ P1; The power shortage maximum that N-2 fault causes is Δ P2.Comprehensive combing Yunnan Power System N-1 disturbance, maximum N-1 disturbance is that small stream Lip river is crossed 700MW unit and tripped at full capacity, and therefore Δ P1 is 700MW; Maximum N-2 disturbance is kwan-yin rock power plant egress line fault, and this fault may cause grid loss 5 600MW units, and therefore Δ P2 is 3000MW.
In step 3, if direct current isolated island sends electrical network acquiescence drop into direct current frequency restriction control FLC function, then exit this function, otherwise omit step 3.
In step 4, adopt full dynamic simulation program, calculate under power shortage Δ P1 (700MW) condition, island-grid frequency retrieval is to F1 (49.8HZ), the required reserved primary frequency modulation reserve capacity P1-1 of system is 370MW, whole process simulation result as shown in Figure 3, illustrated therein is and under power shortage Δ P1 (700MW) condition, meets F1 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
In step 5, adopt full dynamic simulation program, calculate under power shortage Δ P1 condition, island-grid frequency retrieval is to F2 (49.9HZ), system is on P1-1 basis, also needing to increase reserved frequency modulation frequency modulation reserve capacity P1-2 is 200MW, and whole process simulation result as shown in Figure 4, illustrated therein is and under power shortage Δ P1 (700MW) condition, meets F2 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
In step 6, adopt full dynamic simulation program, calculate under power shortage Δ P2 (3000MW) condition, island-grid frequency retrieval is to F1 (49.8HZ), the required reserved primary frequency modulation reserve capacity P2-1 (3000MW) of system, whole process simulation result as shown in Figure 5, illustrated therein is and under power shortage Δ P2 (3000MW) condition, meets F1 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.As seen from the figure, Yunnan isolated island sends mains frequency intelligent restoration to 49.75HZ, this is because unit primary frequency modulation is droop control, the primary frequency modulation characteristic inherent characteristic that Yunnan isolated island sends electrical network can only make frequency retrieval to 49.75HZ, primary frequency modulation recovery of aiming at steady frequency more than more than 3000MW for subsequent use is played and will do not had better effect, therefore configuration primary frequency modulation reserve capacity is P2-1 be 3000MW is rational.
In step 7, adopt full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval is to F2, system is on P2-1 basis, also needing to increase reserved frequency modulation frequency modulation reserve capacity P2-2 is 1800MW, and whole process simulation result as shown in Figure 6, illustrated therein is and under power shortage Δ P2 (3000MW) condition, meets F2 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.
In step 8, drop into direct current isolated island and send electrical network FLC function.
In step 9, adopt full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval is to F2, and FLC DC power modulation amount reverts to 0 before frequency modulation frequency modulation action, the required reserved frequency modulation frequency modulation reserve capacity P3-2 of system is 1800MW, and whole process simulation result as shown in Figure 7, illustrated therein is and under power shortage Δ P2 (3000MW) condition, meets F2 target Yunnan isolated island according to the embodiment of the present invention and send mains frequency recovery situation outside.Fig. 8 shows and under power shortage Δ P2 (3000MW) condition, meets F2 target each direct current FLC DC power modulation amount action situation according to the embodiment of the present invention, before frequency modulation frequency modulation action (180 seconds), each direct current FLC DC power modulation amount reverts to 0.
In step 10, P1-2 (200MW) and P2-2 (1800MW) is the two-stage frequency modulation frequency modulation reserve capacity configuration that direct current isolated island transmitting system can resist N-1 and N-2 fault, and P3-2 can resist the frequency modulation frequency modulation reserve capacity configuration of N-2 fault under being direct current isolated island transmitting system configuration FLC.
The present invention has following one or more beneficial effect:
(1) scheme, when determining the whole network load minimum value for subsequent use, empirically, adopts a certain ratio (2%-8%) of the whole network peak load, needs follow-up its reasonability of a large amount of calculation check in the past.Adopt the technical program, by analyzing the outer pushing electric network mode of direct current isolated island, finding out the power shortage that N-1, N-2 are maximum, in this, as the rational fault of checkschema, can amount of calculation be alleviated.
(2) scheme frequency modulation frequency modulation was for subsequent use be in the past by deduct in the whole network load minimum value for subsequent use primary frequency modulation for subsequent use after obtain, whether can meet frequency modulation frequency modulation target cannot determine.Adopt the technical program, set up F2 standard to carry out target and send electric grid secondary frequency modulation situation to assess direct current isolated island, can guarantee that gained frequency modulation frequency modulation reserve capacity can meet frequency modulation frequency modulation requirement.
(3) scheme, when configuring frequency modulation frequency modulation capacity, does not consider system network shelf structure characteristic in the past.Adopt the technical program, consider direct current isolated island send electrical network configuration FLC after impact.
Although illustrate and describe the present invention with reference to certain exemplary embodiments of the present invention, but those skilled in the art should understand that, when not deviating from the spirit and scope of the present invention of claims and equivalents thereof, the multiple change in form and details can be carried out to the present invention.Therefore, scope of the present invention should not be limited to above-described embodiment, but should not only be determined by claims, is also limited by the equivalent of claims.
Claims (2)
1. direct current isolated island sends an electric grid secondary frequency modulation reserve capacity collocation method, and it is characterized in that, the method comprises the steps:
It is F1 that step 1, clear and definite direct current isolated island send primary frequency regulation of power network control objectives, and frequency modulation frequency modulation control objectives is F2;
It is Δ P1 that step 2, clear and definite direct current isolated island send the power shortage maximum that electrical network N-1 fault causes; The power shortage maximum that N-2 fault causes is Δ P2;
If electrical network acquiescence of sending step 3 direct current isolated island drops into direct current frequency restriction control FLC function, then exit this function, otherwise omit step 3;
Step 4, adopt full dynamic simulation program, calculate under power shortage Δ P1 condition, island-grid frequency retrieval to F1, the required reserved primary frequency modulation reserve capacity P1-1 of system;
Step 5, employing full dynamic simulation program, calculate under power shortage Δ P1 condition, and island-grid frequency retrieval is to F2, and system, on P1-1 basis, also needs to increase reserved frequency modulation frequency modulation reserve capacity P1-2;
Step 6, adopt full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval to F1, the required reserved primary frequency modulation reserve capacity P2-1 of system;
Step 7, employing full dynamic simulation program, calculate under power shortage Δ P2 condition, and island-grid frequency retrieval is to F2, and system, on P2-1 basis, also needs to increase reserved frequency modulation frequency modulation reserve capacity P2-2;
Step 8, input direct current isolated island send electrical network FLC function;
Step 9, employing full dynamic simulation program, calculate under power shortage Δ P2 condition, island-grid frequency retrieval is to F2, and FLC DC power modulation amount reverts to 0 before frequency modulation frequency modulation action, the required reserved frequency modulation frequency modulation reserve capacity P3-2 of system;
Step 10, P1-2 and P2-2 are direct current isolated island transmitting system without the two-stage frequency modulation frequency modulation reserve capacity configuration can resisting N-1 and N-2 fault in FLC situation, and P3-2 can resist the frequency modulation frequency modulation reserve capacity configuration of N-2 fault under being direct current isolated island transmitting system configuration FLC.
2. the method for claim 1, is characterized in that:
In described step 1, F1 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.2HZ;
F2 is determined by following principle, and after being namely disturbed, system frequency returns to 50 ± 0.1HZ.
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| 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 |
| CN113422377A (en) * | 2021-08-25 | 2021-09-21 | 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 |
| CN112039092B (en) * | 2020-09-23 | 2024-07-09 | 华北电力大学 | Island direct-current output AGC model prediction control method considering energy storage SOC recovery |
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| 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 |
| CN112039092B (en) * | 2020-09-23 | 2024-07-09 | 华北电力大学 | Island direct-current output AGC model prediction control method considering energy storage SOC recovery |
| CN113422377A (en) * | 2021-08-25 | 2021-09-21 | 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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