CN108110807B - Multi-terminal flexible direct-current power grid converter station locking fault emergency control method - Google Patents
Multi-terminal flexible direct-current power grid converter station locking fault emergency control method Download PDFInfo
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected 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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention discloses a locking fault emergency control method for a multi-terminal flexible direct-current power grid converter station, which comprises the step of determining the unbalanced active power value P of a direct-current power grid under a fault0(ii) a Calculating an adjustable active capacity value P for a non-faulty converter station using constant voltage control1(ii) a Calculating an adjustable active capacity value P for a non-faulty converter station using droop control2(ii) a Calculating an adjustable active capacity value P for a non-faulty converter station with constant active power control3(ii) a If P0＞P1+P2Adjusting the active power reference value P of the non-faulty converter station with constant active power controlynAnd finishing the emergency control. Aiming at the locking fault of the converter station of the multi-terminal flexible direct-current power grid, the self-regulation capability of the converter station with different control modes is fully exerted, the safe and stable operation of the multi-terminal flexible direct-current power grid is ensured, and a reference can be provided for the safe and stable operation and the control strategy formulation of the multi-terminal flexible direct-current power grid.
Description
Technical Field
The invention relates to a locking fault emergency control method for a multi-terminal flexible direct-current power grid converter station, and belongs to the technical field of power system automation.
Background
Due to the advent of modular multilevel converters and advances in power electronics technology, flexible dc transmission has gained rapid worldwide use. Particularly, with the increase of new energy grid connection requirements and the improvement of a coordination control technology between multi-terminal converter stations, multi-terminal flexible direct current and direct current networking becomes an important development trend of flexible direct current transmission. Multiple multi-terminal flexible direct-current transmission projects are built in China for commissioning, and if the commissioned Zhoushan multi-terminal flexible direct-current transmission system effectively enhances the power supply reliability of the island-type power grid; the method comprises the following steps that the problem of wind power output of a south Australia island is effectively solved by the launched south Australia multi-terminal flexible direct current transmission project; the +/-500 kV Beijing four-end flexible direct-current power grid for planning and construction collects and connects new energy in the Jiakou area to load centers such as Beijing, can solve the problem of new energy connection and can effectively relieve the power supply pressure of the load centers such as the Beijing.
At present, research on a multi-terminal flexible direct-current power transmission system at home and abroad mostly focuses on aspects of flexible direct-current body control strategy optimization, flexible direct-current power grid power flow control and the like, and urgent research needs to be carried out on an emergency control technology under the fault of a multi-terminal flexible direct-current power grid. The existing emergency power band-switching control strategy is also mainly suitable for a true bipolar flexible direct-current power grid converter station to generate a unipolar blocking fault or a direct-current line unipolar shutdown fault, and for the bipolar blocking fault of the converter station, the actual engineering application requirements are difficult to adapt only by the power band-switching strategy. When any converter station of the multi-terminal flexible direct current transmission system is locked or quits operation, how to fully exert the adjusting capability of other converter stations is a technology which ensures safe and stable operation of a multi-terminal flexible direct current power grid and needs to be researched and solved urgently.
Disclosure of Invention
In order to solve the technical problem, the invention provides a locking fault emergency control method for a converter station of a multi-terminal flexible direct-current power grid.
In order to achieve the purpose, the invention adopts the technical scheme that:
a locking fault emergency control method for a multi-terminal flexible direct current power grid converter station comprises the following steps,
determining unbalanced active power value P of direct current power grid under fault0；
ComputingAdjustable active capacity value P of non-fault converter station controlled by constant voltage1；
Calculating an adjustable active capacity value P for a non-faulty converter station using droop control2；
Calculating an adjustable active capacity value P for a non-faulty converter station with constant active power control3；
If P0＞P1+P2Adjusting the active power reference value P of the non-faulty converter station with constant active power controlynAnd finishing the emergency control.
P1The formula for calculating (a) is as follows,
wherein r is the total number of non-fault converter stations controlled by constant voltage, Pi0Injected active power, P, for the ith non-faulty converter station with constant voltage controlimRated power, S, for the ith non-faulty converter station with constant voltage controliFor the ith non-fault converter station power transmission direction adopting constant voltage control, i belongs to [1, r ∈]。
When P is presenti0Direction of (1) and P0When the directions of (A) and (B) are the same, Si1, otherwise Si＝-1。
P2The formula for calculating (a) is as follows,
wherein n is the total number of non-faulty converter stations with droop control, Pj0Injected active power, P, for jth non-faulty converter station with droop controljmRated power for jth non-faulty converter station with droop control, FjFor the jth non-faulty converter station power delivery direction with droop control, j ∈ [1, n ]]。
When P is presentj0Direction of (1) and P0When the directions of (A) and (B) are the same, Fj＝1，Otherwise Fj＝-1。
P3The formula for calculating (a) is as follows,
wherein t is the total number of non-fault converter stations adopting constant power control, Py0Injected active power, P, for the y-th non-faulty converter station with constant power controlymRated power, R, of the y-th non-faulty converter station with constant power controlyFor the y-th power transmission direction of the non-fault converter station adopting constant power control, y belongs to [1, t ]]。
When P is presenty0Direction of (1) and P0When the directions of (A) and (B) are the same, RyNot all right 1, otherwise Ry＝-1。
If P3＞P0-P1-P2According to the formula
Adjusting Pyn。
If P3≤P0-P1-P2Then according to formula Pyn＝RyPymAdjusting Pyn。
The invention achieves the following beneficial effects: aiming at the locking fault of the converter station of the multi-terminal flexible direct-current power grid, the self-regulation capability of the converter station with different control modes is fully exerted, the safe and stable operation of the multi-terminal flexible direct-current power grid is ensured, and a reference can be provided for the safe and stable operation and the control strategy formulation of the multi-terminal flexible direct-current power grid.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a diagram of a built four-terminal true bipolar flexible direct-current power grid;
FIG. 3 is a waveform diagram of the injected active power response without the proposed control strategy;
FIG. 4 is a waveform diagram of the injected active power response after the proposed control strategy is adopted;
fig. 5 is a waveform diagram of the dc voltage response before and after the proposed control strategy is adopted.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, a method for emergency control of lockout fault of a multi-terminal flexible direct current power grid converter station includes the following steps:
step 1, determining an unbalanced active power value P of a direct current power grid under a fault0。
Step 2, calculating the adjustable active capacity value P of the non-fault converter station adopting constant voltage control1Calculating the adjustable active capacity value P of the non-fault converter station adopting droop control2Calculating an adjustable active capacity value P of a non-faulty converter station controlled with a fixed active power3。
P1The calculation formula of (2) is as follows:
wherein r is the total number of non-fault converter stations controlled by constant voltage, Pi0Injected active power, P, for the ith non-faulty converter station with constant voltage controlimRated power, S, for the ith non-faulty converter station with constant voltage controliFor the ith non-fault converter station power transmission direction adopting constant voltage control, i belongs to [1, r ∈]When P isi0Direction of (1) and P0When the directions of (A) and (B) are the same, Si1, otherwise Si＝-1。
P2The calculation formula of (2) is as follows:
wherein n is the total number of non-faulty converter stations with droop control, Pj0Non-fault with droop control for jthInjected active power, P, of a converter stationjmRated power for jth non-faulty converter station with droop control, FjFor the jth non-faulty converter station power delivery direction with droop control, j ∈ [1, n ]]When P isj0Direction of (1) and P0When the directions of (A) and (B) are the same, Fj1, otherwise Fj＝-1。
P3The calculation formula of (2) is as follows:
wherein t is the total number of non-fault converter stations adopting constant power control, Py0Injected active power, P, for the y-th non-faulty converter station with constant power controlymRated power, R, of the y-th non-faulty converter station with constant power controlyFor the y-th power transmission direction of the non-fault converter station adopting constant power control, y belongs to [1, t ]]When P isy0Direction of (1) and P0When the directions of (A) and (B) are the same, RyNot all right 1, otherwise Ry＝-1。
Step 3, judging P0＞P1+P2And if the judgment result is positive, the step 4 is carried out, and if the judgment result is negative, the step is ended.
Step 4, adjusting the active power reference value P of the non-fault converter station adopting constant active power controlynAnd finishing the emergency control.
If P3＞P0-P1-P2Then according to
Adjusting Pyn(ii) a If P3≤P0-P1-P2Then according to Pyn＝RyPymAdjusting Pyn。
When the built four-terminal true bipolar flexible direct-current power grid normally operates, the moisture distribution is shown in fig. 2, the parameters of the positive and negative electrode systems are consistent, the active power injected into the direct-current power grid is specified to be the positive direction, and the simulation parameters of the positive electrode power grid are shown in table 1. The converter station 1 consists of an MMC (converter) 1p and an MMC1n, the converter station 2 consists of an MMC2p and an MMC2n, the converter station 3 consists of an MMC3p and an MMC3n, and the converter station 4 consists of an MMC4p and an MMC4 n; the converter stations 1 and 3 adopt droop control, the converter station 2 adopts constant voltage control, the converter station 4 adopts constant active power control, and the converter stations 1 and 3 are respectively connected with the wind power plants 1 and 2.
TABLE 1 parameters of the positive DC network converter station
When a blocking fault occurs in the converter station 3, the power reference value of the converter station 4 is adjusted according to the following steps, and the specific process is as follows:
A) determining the unbalanced active power value P of a direct current power grid0(ii) a The converter station 3 is locked to cause the direct current power grid to lose 2500MW active power, namely P0＝2500MW。
B) Calculating P1、P2And P3；P12180MW，P2＝250MW，P3＝3000MW。
C) Due to P0＞P1+P2，P3＞P0-P1-P2The power reference values of the converter stations MMC4p and MMC4n are adjusted to-1450 MW, so the power reference value of the converter station 4 needs to be adjusted to-1450 MW.
Fig. 3 and 4 are respectively a waveform diagram of active power response injected before and after the proposed control strategy is adopted. In the figure, P1, P2, P3 and P4 respectively represent active power injected into a direct current power grid by a wind farm 1, a balance station, a wind farm 2 and a load center.
Fig. 5 is a dc voltage response graph before and after an emergency control strategy is adopted. As can be seen from fig. 5, at the moment of a blocking fault of the converter stations MMC3p and MMC3n, the active power exchanged between the converter station 3 and the ac system is reduced to 0MW, the dc network loses active power of 2500MW, since the active power output by the receiving end remains unchanged, a part of the active power is generated by the dc system to cause the dc capacitor to discharge, and the transient dc voltage drops to 420kV (0.84pu.) to the minimum; if the emergency control measures are not taken, the active power injected into the direct current power grid by the converter station 4 oscillates and the direct current voltage also oscillates; after the active power reference value of the converter station 4 is adjusted according to the proposed control strategy, both the injected active power and the dc voltage can maintain stable operation, and finally the dc voltage is stabilized at 475kV (0.95 pu).
In conclusion, the method gives full play to the self-regulation capability of the converter station in different control modes, ensures the safe and stable operation of the multi-terminal flexible direct-current power grid, and can provide reference for the safe and stable operation and control strategy formulation of the multi-terminal flexible direct-current power grid.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A locking fault emergency control method for a multi-terminal flexible direct current power grid converter station is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
determining unbalanced active power value P of direct current power grid under fault0；
Calculating an adjustable active capacity value P for a non-faulty converter station using constant voltage control1；
P1The formula for calculating (a) is as follows,
wherein r is the total number of non-fault converter stations controlled by constant voltage, Pi0Injected active power, P, for the ith non-faulty converter station with constant voltage controlimRated power, S, for the ith non-faulty converter station with constant voltage controliUsing constant voltage control for the ithI ∈ [1, r ] in the direction of power delivery from the non-faulty converter station]；
Calculating an adjustable active capacity value P for a non-faulty converter station using droop control2；
P2The formula for calculating (a) is as follows,
wherein n is the total number of non-faulty converter stations with droop control, Pj0Injected active power, P, for jth non-faulty converter station with droop controljmRated power for jth non-faulty converter station with droop control, FjFor the jth non-faulty converter station power delivery direction with droop control, j ∈ [1, n ]]；
Calculating an adjustable active capacity value P for a non-faulty converter station with constant active power control3；
P3The formula for calculating (a) is as follows,
wherein t is the total number of non-fault converter stations adopting constant power control, Py0Injected active power, P, for the y-th non-faulty converter station with constant power controlymRated power, R, of the y-th non-faulty converter station with constant power controlyFor the y-th power transmission direction of the non-fault converter station adopting constant power control, y belongs to [1, t ]]；
If P0＞P1+P2Adjusting the active power reference value P of the non-faulty converter station with constant active power controlynAnd finishing the emergency control.
2. The method for emergency control of blocking faults of the multi-terminal flexible direct current power grid converter station according to claim 1, is characterized in that: when P is presenti0Direction of (1) and P0Direction of (1)When they are consistent, Si1, otherwise Si＝-1。
3. The method for emergency control of blocking faults of the multi-terminal flexible direct current power grid converter station according to claim 1, is characterized in that: when P is presentj0Direction of (1) and P0When the directions of (A) and (B) are the same, Fj1, otherwise Fj＝-1。
4. The method for emergency control of blocking faults of the multi-terminal flexible direct current power grid converter station according to claim 1, is characterized in that: when P is presenty0Direction of (1) and P0When the directions of (A) and (B) are the same, RyNot all right 1, otherwise Ry＝-1。
5. The method for emergency control of blocking faults of the multi-terminal flexible direct current power grid converter station according to claim 1, is characterized in that: if P3＞P0-P1-P2According to the formula
Adjusting Pyn。
6. The method for emergency control of blocking faults of the multi-terminal flexible direct current power grid converter station according to claim 1, is characterized in that: if P3≤P0-P1-P2Then according to formula Pyn＝RyPymAdjusting Pyn。
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| CN109307825B (en) * | 2018-10-26 | 2022-09-20 | 中国电力科学研究院有限公司 | Method and system for acquiring fault measure quantity of direct-current single-pole line of flexible direct-current power grid |
| CN109494779B (en) * | 2018-10-26 | 2022-03-04 | 中国电力科学研究院有限公司 | Method and system for acquiring locking fault measure quantity of converter of flexible direct current power grid |
| CN109802428B (en) * | 2018-12-24 | 2021-11-05 | 中国电力科学研究院有限公司 | Method and system for calculating locking fault measure quantity of converter station of flexible direct current power grid safety control system |
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| EP3012943A2 (en) * | 2014-10-23 | 2016-04-27 | General Electric Company | Protection methods and switches in uninterruptible power supply systems |
| CN106099899A (en) * | 2016-05-30 | 2016-11-09 | 浙江大学 | A kind of band dead band direct current network voltage droop control strategy based on voltage reference node |
| CN107196343A (en) * | 2017-07-19 | 2017-09-22 | 国家电网公司 | A kind of voltage scheduling method a few days ago of multiterminal flexible direct current island-grid sending end |
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| EP3012943A2 (en) * | 2014-10-23 | 2016-04-27 | General Electric Company | Protection methods and switches in uninterruptible power supply systems |
| CN104333037A (en) * | 2014-11-02 | 2015-02-04 | 中国科学院电工研究所 | Cooperative control method for participating in frequency modulation and pressure regulation of power system by wind storage cluster |
| CN106099899A (en) * | 2016-05-30 | 2016-11-09 | 浙江大学 | A kind of band dead band direct current network voltage droop control strategy based on voltage reference node |
| CN107196343A (en) * | 2017-07-19 | 2017-09-22 | 国家电网公司 | A kind of voltage scheduling method a few days ago of multiterminal flexible direct current island-grid sending end |
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