CN109888813B - Method for maximizing power transmission capacity of multi-power source output channel comprising VSC-HVDC - Google Patents
Method for maximizing power transmission capacity of multi-power source output channel comprising VSC-HVDC Download PDFInfo
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Abstract
The invention relates to a method for maximizing the transmission capacity of a multi-power source output channel containing VSC-HVDC, which comprises the following steps: establishing a power grid simulation calculation model containing VSC-HVDC; researching the influence of a VSC-HVDC control mode and parameters on the stability of the alternating current system, and determining the VSC-HVDC control mode and parameters; calculating the sensitivity of the influence of the output of each power source on the power transmission capacity of the transmission channel when the N-1 check is met, and determining the priority of the transmission of the power sources under the normal mode; and calculating the power reduction measure quantity of each power source after the N-2 fault, and determining the safety control measure after the N-2 fault. The invention ensures that the computer transmission capacity of the outgoing channel is utilized to the maximum from 3 aspects of selection of a VSC-HVDC control mode and parameters, arrangement of power source output in a normal mode and determination of safety control measures after faults, and has the advantages of simple and convenient calculation, clear flow and convenient engineering application.
Description
Technical Field
The invention relates to the field of power systems, in particular to a method for maximizing the utilization of the transmission capacity of a multi-power-source output channel comprising VSC-HVDC.
Background
The flexible direct current transmission (VSC-HVDC) technology has the advantages that active power and reactive power can be independently controlled, no phase commutation failure danger exists, reactive compensation is not needed, and the like, the technical advantages are particularly suitable for small hydropower station local power grids and grid connection of new energy, and the VSC-HVDC asynchronous networking is a new choice. Energy resources in China are quite rich, and with the acceleration of energy development, in power enrichment areas, a plurality of power sources are collected and then are sent out in a centralized mode, so that a multi-power-source sending-out system structure comprising VSC-HVDC and conventional units is formed. At present, the domestic power grid clean energy delivery requirement cannot be fully met, and the three abandons (wind abandoning, light abandoning and water abandoning) problem caused by the domestic power grid clean energy delivery requirement is contradictory and prominent in a plurality of provinces. The power transmission capacity of the existing delivery channel section is continuously extruded, the power grid operation is closer to the stability limit of the power grid, and the problem of electricity leakage generally exists in delivery in an electricity enrichment area. Therefore, how to utilize the advantages of the VSC-HVDC and reasonably arrange the output of each power source so as to maximize the power transmission capability of the existing power transmission output channel and improve the utilization rate of clean energy is an important problem for a multi-power-source power transmission system comprising the VSC-HVDC.
Disclosure of Invention
In order to solve the problems, the invention provides a method for maximizing the transmission capacity of a multi-power-source output channel comprising VSC-HVDC, which enables the transmission capacity of an output channel to be utilized to the maximum by properly selecting a VSC-HVDC control mode and parameters, reasonably arranging the priority of the output of each power source in a normal mode and reasonably arranging safety control measures after N-2 faults of a power grid.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for maximizing transmission capacity of a multi-power source output channel containing VSC-HVDC comprises the following steps:
(1) establishing a power grid simulation calculation model containing VSC-HVDC;
(2) researching the influence of the VSC-HVDC control mode and parameters on the stability of the alternating current system, and determining the VSC-HVDC control mode and parameters;
(3) calculating the sensitivity of the influence of the output of each power source on the power transmission capacity of the external transmission channel when the N-1 check is met, and determining the priority of the output of the hydropower of each power source in a normal mode;
(4) and calculating the power reduction measure quantity of each power source after the N-2 fault, and determining the safety control measure after the N-2 fault.
Further, the grid simulation calculation model containing VSC-HVDC comprises: the system comprises a generator and a control system thereof, power grid structure parameters, loads, a VSC-HVDC and a control protection system thereof and other parameters of AC/DC power transmission equipment.
Further, the step (2) is specifically as follows: based on a power grid simulation model, the influence of VSC-HVDC active and reactive control modes and parameters thereof on the stability of the multi-power source hydroelectric power transmission system N-1 after the fault is researched, and the VSC-HVDC control mode and parameters which are beneficial to improving the stability of the system are selected in combination with engineering practice.
Further, the step (3) comprises the following substeps:
step 3-1: under the condition of meeting the local stability constraint of VSC-HVDC (voltage source converter-high voltage direct current) and other power sources, arranging the output of the power sources to be maximum, carrying out full-network N-1 fault scanning, recording the fault causing system instability, and recording as an N-1 constraint fault set omega;
step 3-2: respectively reducing the output of one power source, fixing the outputs of other power sources to be unchanged until the mode is checked through an N-1 constraint fault set omega, and recording the output of each power source and the power transmission capacity of a sending channel in the mode;
step 3-3: and determining the priority of the water and electricity sent out by different power sources according to the descending order of the power transmission capacity of the sending-out channel.
Further, the step (4) comprises the following sub-steps:
step 4-1: on the basis of meeting the N-1 checking mode, carrying out full-network N-2 fault scanning, recording faults causing system instability, and recording the faults as an N-2 constraint fault set;
step 4-2: and during N-2 constraint fault calculation, respectively taking control measures for reducing output of power sources such as VSC-HVDC after the fault until the system after the fault can be kept stable, and recording the power reduction measure quantity of each power source at the moment. Wherein the power source should not reduce the power by more than the actual allowable value;
step 4-3: and (4) in combination with an actual operation mode, setting the priority of small power reduction amount after the N-2 constraint fault as a safety control measure after the N-2 fault.
The invention has the following advantages:
1. a VSC-HVDC control mode and parameters capable of improving the stability of an alternating current system are selected, so that the improvement of the power transmission capacity of an alternating current outgoing channel is facilitated;
2. according to different sensitivities of the output of each power source on the influence of the power transmission capacity of the outgoing channel, the outgoing determines how to arrange the output of each power source in a normal operation mode so as to maximize the power transmission power of the total outgoing channel, namely, the power transmission capacity of the outgoing channel of the system in the normal operation mode is fully utilized;
3. and determining the safety control measure with the minimum power reduction amount after the N-2 fault so as to enable the power transmission power of the outgoing channel after the fault to reach the maximum value, thereby fully utilizing the power transmission capacity of the outgoing channel of the system after the fault.
The invention ensures that the computer transmission capacity of the outgoing channel is utilized to the maximum from 3 aspects of selection of a VSC-HVDC control mode and parameters, arrangement of power source output in a normal mode and determination of safety control measures after faults, and has the advantages of simple and convenient calculation, clear flow and convenient engineering application.
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FIG. 1 is a flow chart of a method for maximizing the utilization of the transmission capacity of a multi-power-source transmission channel comprising VSC-HVDC according to the present invention;
fig. 2 is a schematic structural diagram of a hydroelectric delivery system with multiple power sources in the embodiment of the invention.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and examples.
As shown in fig. 1, one embodiment of the method for maximizing the transmission capacity of a multi-power-source output channel comprising VSC-HVDC of the present invention comprises the following steps:
(1) establishing VSC-HVDC-containing power grid simulation calculation model
Taking a certain area interconnected power grid as an example (as shown in fig. 2), wherein the tail end of the power grid is a hydropower enrichment area, and the power grid comprises 3 power sources: the VSC-HVDC power supply system comprises external clean energy received by VSC-HVDC from other regions, medium-sized hydropower stations accessed to a 500kV power grid and small hydropower station cluster on-grid power accessed to a 220kV and below voltage level power grid, wherein the power of three power sources is collected and finally sent out by a four-circuit 500kV line to be accessed to a main grid. Collecting element parameters required by load flow calculation and transient stability calculation of the system, and establishing a simulation calculation model. Given the limitation of the sending capacity of the local power grid, the maximum output of the three power sources is respectively: VSC-HVDC transmission power is 2000MW, small hydropower station group is 1000MW on line, and medium hydropower station output is 4 x 460 MW.
(2) Researching the influence of the VSC control mode and parameters on the system stability, and determining the VSC-HVDC control mode and parameters
Considering two control modes of VSC-HVDC constant alternating current reactive power and voltage deviation band, the channel outgoing capacity meeting N-1 checking is calculated respectively, and the result is shown in Table 1. Under the voltage deviation band control mode of VSC-HVDC, the transmission capacity of an outgoing channel is improved by 400 MW. Simulation results show that the VSC-HVDC provides dynamic reactive support for the alternating current system in a voltage deviation band control mode, and the stability of the alternating current system after a fault is maintained. Therefore, the VSC-HVDC reactive control mode is selected to select voltage deviation band control and open the dynamic reactive support capability during system fault ride-through. And setting the parameters of the control link by combining the actual engineering and the dynamic response requirements of the system.
TABLE 1 influence of VSC reactive control mode on external transmission channel transmission capacity
(3) Calculating the sensitivity of the influence of the output of each power source on the transmission capacity of the external transmission channel when the N-1 check is met, and determining the priority of the water and electricity output by different power sources under the normal mode
And arranging the output of the three power sources to be maximum, scanning the N-1 fault of the whole network, and determining that the N-1 constraint fault is a Jiangxing N-1 xing side fault and a Fishcing N-1 xing side fault. On the basis of the mode, the small hydropower station group is kept on line and the output of the medium-sized hydropower station is unchanged, when the input power of the VSC-HVDC is reduced to 1000MW, N-1 constraint fault calculation is carried out in the mode, and the system is kept stable after the fault. The output of other two power sources is respectively reduced, and the total water and electricity output section transmission power during the N-1 constraint fault check can be obtained similarly. The results are shown in Table 2.
Table 2 shows that, when the number of small hydroelectric generating sets is reduced to be on line due to the N-1 fault, the total transmission capacity of the outgoing channel is the largest, the VSC-HVDC is the second highest, and the output of the medium-sized hydropower station is the last lowest. Therefore, in a normal mode, when three power sources all have high-power transmission requirements, in order to maximally utilize the power transmission capacity of the outgoing channel, the priority of the outgoing power is arranged as follows: the medium-sized hydropower station > VSC-HVDC > the small hydropower station group surfs the internet.
TABLE 2 comparison of outgoing channel transmission capacities for different power source reductions
(4) Calculating the power reduction measure quantity of each power source after the N-2 fault, and determining the safety control measure after the N-2 fault
The grid operation safety and stability check needs to consider the faults of double circuit lines on the same tower and an important channel N-2, the system is required to be stable under the measures of cutting machine and cutting load, and the like, namely, for the faults of the power delivery system N-2, the method needs to consider the removal of a hydroelectric generating set or the reduction of flexible and straight power (the measures are actually the reduction of the output of a power source to reduce the delivery power of a delivery section, so that the measures become power reduction measures), namely: after a fault, the power transmitted by the hydropower outlet channel is equal to the power transmitted by the channel in the normal operation mode, namely the power reduction measure, and in order to utilize the outgoing section to the maximum, a measure with the minimum power reduction is hopefully found.
On the basis of meeting the N-1 checking mode 2, full-network N-2 fault scanning is carried out, and after a fishery double-circuit N-2 fault and a fishery III + fishery suitable line N-2 fault are found, the system is unstable, and measures for reducing VSC-HVDC power or cutting off a medium-sized hydropower station unit or cutting off a small hydropower station unit after the fault are needed. The maximum VSC-HVDC power drop is 1000MW, the maximum allowable generator tripping of a medium hydropower station is 4, and the maximum allowable small hydropower station is 210 MW. Through calculation, the restriction faults are Fishery III line + Fishery N-2 faults, 1000MW of VSC-HVDC power is adopted, or 2 460MW units of the medium-sized hydropower station are cut off, or 1 460MW unit of the medium-sized hydropower station +2 55MW small hydropower units + 250 MW small hydropower units are cut off, and the corresponding measure quantity of the three measures is shown in a table 3.
TABLE 3 measures corresponding to three measures after N-2 Fault
As can be seen from Table 3, after the fishing line III + fishing suitable N-2 fault occurs in the normal mode, the delivery power of the delivery channel is reduced to 3150MW after the measures of cutting off the medium hydropower station and the small hydropower unit are taken, compared with other two measures, the channel delivery power is increased by 250-330 MW, and the delivery capacity of the delivery channel after the fault is more fully utilized. Therefore, the priority of the safety control measures after the fishing Xing III line and the fishing suitable N-2 fault is as follows: and cutting off the medium-sized hydropower station + small hydropower station and cutting off the medium-sized hydropower station unit to reduce the VSC-HVDC power.
In conclusion, by properly selecting the VSC-HVDC control mode and parameters, reasonably arranging the priority of the output of each power source in the normal mode and the safety control measures after the N-2 fault of the power grid, the power transmission capacity of the outgoing channel is utilized to the maximum extent by applying the method disclosed by the invention.
It is stated that: the summary and the detailed description of the invention are intended to demonstrate the practical application of the technical solutions provided by the present invention, and should not be construed as limiting the scope of the present invention. Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications, equivalents, or improvements may be made to the specific embodiments of the invention without departing from the spirit and principles of the invention, and are intended to be covered by the appended claims.
Claims (3)
1. A method for maximizing the transmission capacity of a multi-power source hydroelectric power outgoing channel comprising VSC-HVDC is characterized by comprising the following steps:
(1) establishing a power grid simulation calculation model containing VSC-HVDC;
(2) researching the influence of the VSC-HVDC control mode and parameters on the stability of the alternating current system, and determining the VSC-HVDC control mode and parameters;
(3) calculating the sensitivity of the influence of the output of each power source on the power transmission capacity of the external transmission channel when the N-1 check is met, and determining the priority of the output of the hydropower of each power source in a normal mode;
(4) calculating the power reduction measure quantity of each power source after the N-2 fault, and determining the safety control measure after the N-2 fault;
the step (3) includes the substeps of:
step 3-1: under the condition of meeting the local stability constraint of a VSC-HVDC power source, arranging the output of the power source to be maximum, carrying out full-network N-1 fault scanning, recording the fault causing system instability, and recording as an N-1 constraint fault set omega;
step 3-2: respectively reducing the output of one power source, fixing the outputs of other power sources to be unchanged until the mode is checked through an N-1 constraint fault set omega, and recording the output of each power source and the power transmission capacity of a sending channel in the mode;
step 3-3: determining the priority of the water and electricity sent out by different power sources according to the descending order of the power transmission capacity of the sending-out channel;
the step (4) comprises the following substeps:
step 4-1: on the basis of meeting the N-1 checking mode, carrying out full-network N-2 fault scanning, recording faults causing system instability, and recording the faults as an N-2 constraint fault set;
step 4-2: when N-2 constraint fault calculation is carried out, control measures for reducing the output of the VSC-HVDC power source after the fault are respectively taken until the system after the fault can be maintained stable, and the power reduction measure quantity of each power source at the moment is recorded, wherein the power reduction measure quantity of the power source should not exceed an actual allowable value;
step 4-3: and (4) in combination with an actual operation mode, setting the priority of small power reduction amount after the N-2 constraint fault as a safety control measure after the N-2 fault.
2. The method according to claim 1, wherein in step (1), the grid simulation calculation model containing VSC-HVDC comprises: the system comprises a generator and a control system thereof, power grid structure parameters, loads, a VSC-HVDC and a control protection system thereof and other parameters of AC/DC power transmission equipment.
3. The method according to claim 1, wherein the step (2) is specifically: based on a power grid simulation model, the influence of VSC-HVDC active and reactive control modes and parameters thereof on the stability of the multi-power source hydroelectric power transmission system N-1 after the fault is researched, and the VSC-HVDC control mode and parameters which are beneficial to improving the stability of the system are selected in combination with engineering practice.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103618331A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Direct-current overvoltage current limiting control method of flexible HVDC convertor station |
| CN106599341A (en) * | 2016-10-21 | 2017-04-26 | 南方电网科学研究院有限责任公司 | Method for generating safe and stable control strategy table containing flexible direct current transmission system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103618331A (en) * | 2013-11-27 | 2014-03-05 | 南方电网科学研究院有限责任公司 | Direct-current overvoltage current limiting control method of flexible HVDC convertor station |
| CN106599341A (en) * | 2016-10-21 | 2017-04-26 | 南方电网科学研究院有限责任公司 | Method for generating safe and stable control strategy table containing flexible direct current transmission system |
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| 《计及相关性的含风电场电力系统概率可用输电能力快速计算》;罗钢等;《中国电机工程学报》;20140305;第34卷(第7期);第1024-1032页 * |
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