CN112671002A - Phase modulator configuration method and device for improving power transmission capacity of new energy high-occupancy power grid - Google Patents
Phase modulator configuration method and device for improving power transmission capacity of new energy high-occupancy power grid Download PDFInfo
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Abstract
The invention discloses a phase modulator configuration method and a phase modulator configuration device for improving the power transmission capacity of a new energy high-occupancy-ratio power grid, and the method comprises the following steps: acquiring key faults and security control strategies of key power transmission sections of the high-occupancy-ratio new energy power grid, which are constrained by steady-state voltage deviation; selecting the voltage deviation of each bus from large to small after the faultmThe bus serves as a candidate installation point of the phase modulator; selecting a bus with the largest improvement amount of the transmission capacity of the key section after the installation of the phase modulators with the same capacity as an optimal configuration point of the phase modulators; calculating the lifting amount of phase modulators with different capacities when the phase modulators are installed at the optimal configuration point; and finally determining the optimal installation capacity and the optimal configuration point of the phase modulator according to the comprehensive transmission capacity improvement amount and the performance cost ratio index of the capacity of the phase modulator. The invention not only effectively improves the power transmission capability of the AC tie line, but also promotesThe local economy is developed, the efficiency cost ratio of the installed phase modulator is optimal, and the operation benefit of the power grid equipment is improved.
Description
Technical Field
The invention belongs to the technical field of power systems and automation thereof, and particularly relates to a phase modulator configuration method and device for improving the power transmission capacity of a new energy high-occupancy-ratio power grid.
Background
In order to deal with environmental pollution and climate change and guarantee sustainable development of the economic society, more and more renewable energy sources such as wind power, photovoltaic and the like are connected into a power system, but the time-space distribution characteristics and uncertainty of the renewable energy sources also bring new challenges to safe and stable operation of a power grid. Because the new energy unit does not have the voltage regulation capability, the power grid voltage regulation capability gradually slides down along with the continuous improvement of the new energy ratio, and for the high-ratio new energy power grid, the problem of serious deviation of the steady-state voltage of the power grid can be caused after a large number of measures such as generator tripping and load shedding are taken under the condition of serious alternating current and direct current faults, and the power grid equipment is threatened.
The phase modulator is used as a common reactive power compensation device, has the advantages of high tracking speed, wide compensation range, low failure rate and the like, can provide short-circuit capacity and rotary inertia for a system by being used as rotary equipment, is widely applied to a power system, and becomes an effective means for solving the problem of steady-state voltage deviation caused by adopting safety control measures after serious faults of a high-occupancy new energy power grid and improving the power transmission capacity of the power grid. However, different configuration places of the phase modulator have different voltage control effects on the power grid after an accident, the investment of phase modulator equipment and the control benefit of the power grid can show a parabolic trend along with the increase of configuration capacity, and thus, both the configuration place and the configuration capacity of the phase modulator have optimization spaces.
Disclosure of Invention
The purpose of the invention is: in order to overcome the defects, a phase modulator configuration method and a phase modulator configuration device for improving the power transmission capacity of a new energy high-occupancy-ratio power grid are provided, and the problems that the phase modulator configuration place and the configuration capacity are inaccurate are solved.
The invention is realized by adopting the following technical scheme: a phase modulator configuration method for improving the transmission capacity of a new energy high-occupancy-ratio power grid comprises the following steps:
acquiring key faults and safety control strategy information of key power transmission sections of the high-occupancy new energy power grid, which are constrained by steady-state voltage deviation;
determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information of the key faults;
determining an optimal configuration location of the phase modulation machine based on the candidate installation point;
calculating the improvement amount of the power transmission capacity of the key section when phase modulators with different capacities are installed in the optimal configuration place;
and calculating the efficiency cost-to-performance ratio for installing the phase modulators with different capacities based on the increased quantity, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators.
Further, determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information thereof, wherein the candidate installation points comprise:
according to the typical operation mode of the high-occupancy new energy power grid and the safety control strategy information, simulating and calculating the voltage of each bus in the system after the safety control measures are considered for the key faults, and according to the voltage offset statistical result, selecting m buses A from large to small according to the voltage offset1、A2…AmAs candidate mount points for the phase modulator.
Further, the voltage offset is obtained by subtracting a corresponding voltage limit value from the bus voltage after the fault.
Further, determining an optimal location for phase modulation machines based on the candidate installation points includes:
respectively simulating and calculating m buses A under a typical operation mode1、A2…AmSet capacity of Q at installation0The lifting amount of the power transmission capacity of the key section is increased after the phase modulator is used, and a bus with the largest lifting amount is selected as an optimal configuration place of the phase modulator.
Further, calculating the improvement amount of the power transmission capacity of the critical section when phase modulators with different capacities are installed in the optimal configuration place, comprises:
respectively simulating and calculating different capacities Q in a typical operation modeiThe phase modulator is arranged at the optimal configuration place, and the lifting amount y of the power transmission capacity of the key section isi(ii) a i is 1,2, …, n, n represents the total number of different phase modulators.
Further, calculating the efficiency cost ratio for installing phase modulators with different capacities based on the lifting amount, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators, wherein the method comprises the following steps:
calculating the performance cost index Ti＝yi/Qi；
Will find TiSorting the values, selecting TiAnd the maximum value of the corresponding phase modulator is used as the optimal installation capacity of the final phase modulator, and the drop point is the optimal configuration place.
A phase modulation machine configuration device for improving transmission capacity of a new energy high-occupancy-ratio power grid comprises:
the information acquisition module is used for acquiring key faults and safety control strategy information of the key power transmission section of the high-occupancy new energy power grid, which is constrained by steady-state voltage offset;
the candidate installation point calculation module is used for determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information of the key faults;
the optimal configuration place calculation module is used for determining the optimal configuration place of the phase modulator based on the candidate installation points;
the optimal installation capacity calculation module is used for calculating the improvement amount of the transmission capacity of the key section when the phase modulators with different capacities are installed in the optimal configuration place; and calculating the efficiency cost-to-performance ratio for installing the phase modulators with different capacities based on the increased quantity, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators.
Further, determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information thereof, wherein the candidate installation points comprise:
according to the typical operation mode of the high-occupancy new energy power grid and the safety control strategy information, simulating and calculating the voltage of each bus in the system after the safety control measures are considered for the key faults, and according to the voltage offset statistical result, selecting m buses A from large to small according to the voltage offset1、A2…AmAs candidate mount points for the phase modulator.
Further, determining an optimal location for phase modulation machines based on the candidate installation points includes:
respectively simulating and calculating m buses A under a typical operation mode1、A2…AmSet capacity of Q at installation0The phase modifier can increase the transmission capacity of the critical section and select the maximumAnd the bus with the increased amount is used as the optimal configuration place of the phase modulator.
Further, calculating the improvement amount of the power transmission capacity of the key section when the phase modulators with different capacities are installed in the optimal configuration place, calculating the efficiency cost ratio for installing the phase modulators with different capacities based on the improvement amount, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators, wherein the method comprises the following steps:
respectively simulating and calculating different capacities Q in a typical operation modeiThe phase modulator is arranged at the optimal configuration place, and the lifting amount y of the power transmission capacity of the key section isi(ii) a i is 1,2, …, n, n represents the total number of different phase modulators.
Calculating the performance cost index Ti＝yi/Qi；
Will find TiSorting the values, selecting TiAnd the maximum value of the corresponding phase modulator is used as the optimal installation capacity of the final phase modulator, and the drop point is the optimal configuration place.
The invention has the following beneficial effects: the method comprises the steps of firstly selecting the optimal installation point of the phase modifier by the influence of the phase modifier on the power transmission capacity, and then selecting the optimal installation capacity of the phase modifier by comprehensively considering the power transmission capacity improvement amount after installing the phase modifiers with different capacities and the efficiency cost ratio index of the capacity of the phase modifier, thereby obtaining the optimal installation capacity and the optimal drop point of the phase modifier.
The power transmission capacity of a new energy high-occupancy-ratio power grid is improved by selecting the optimal installation capacity and the optimal drop point of the phase modulator, so that the power transmission capacity of the power grid is effectively improved, the local economic development is promoted, and the economic benefit after the phase modulator is installed is maximized.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
Example 1:
as shown in fig. 1, a phase modulator configuration method for improving the transmission capacity of a new energy high-occupancy-ratio power grid includes the steps:
step 1, acquiring a key fault F of a key power transmission section of a high-occupancy new energy power grid and safety control strategy information of the key fault F, wherein the key fault F is constrained by steady-state voltage offset;
step 2, according to the typical operation mode of the high-ratio new energy power grid and the safety control strategy information, simulating and calculating the voltage of each bus in the system after the key fault F takes the safety control measures into consideration, according to the voltage offset statistical result, selecting m buses A from large to small according to the voltage offset1、A2…AmAs candidate mounting points for phase modulators;
the voltage offset is obtained by subtracting the corresponding voltage limit from the bus voltage after the fault.
Typical operation modes of the high-occupancy-ratio new energy power grid include: the new energy large power generation mode (the photovoltaic output simultaneous rate is 0.8, the wind power output simultaneous rate is 0.7) and the key section transmission power reach the limit power specified by operation;
step 3, respectively simulating and calculating m buses A under a typical operation mode1、A2…AmSet capacity of Q at installation0The lifting amount of the power transmission capacity of the key section after the phase modulator is respectively recorded as delta Ps1、△Ps2…△PsmSelecting the bus with the maximum lifting amount as the optimal configuration place of the phase modulator;
step 4, respectively simulating and calculating different capacities Q in a typical operation modei(i-1, 2 … n) the amount y of critical section capacity increase when the phase modulator is installed at the optimal deployment sitei(ii) a n represents the total number of different phase modulators;
and 5, calculating the efficiency cost ratio indexes of different phase modifier configurations by integrating the power transmission capacity improvement amount and the capacity of the phase modifier, and finally determining the optimal installation capacity of the phase modifier so as to obtain the optimal configuration place and the installation capacity of the phase modifier. The determination is made by the following method:
5-a) defining a potency cost ratio indicator Ti＝yi/Qi.
5-b) converting the determined TiSorting the values, selecting TiPhase modulators with maximum value and applying the sameAnd 3, taking the capacity of the phase modifier as the installation capacity of the final phase modifier, and taking the optimal configuration place determined according to the step 3 as the landing point of the phase modifier.
The invention discloses a phase modulator optimal configuration method for improving the transmission capacity of a new energy high-occupancy-ratio power grid, which is used for acquiring key faults and safety control strategies of key transmission sections of the high-occupancy-ratio new energy power grid, wherein the key faults are constrained by steady-state voltage deviation; selecting m buses as candidate mounting points of a phase modulator from large to small according to voltage deviation of each bus after the fault; selecting a bus with the largest improvement amount of the transmission capacity of the key section after the installation of the phase modulators with the same capacity as an optimal configuration point of the phase modulators; calculating the lifting amount of phase modulators with different capacities when the phase modulators are installed at the optimal configuration point; and finally determining the optimal installation capacity and the optimal configuration point of the phase modulator according to the comprehensive transmission capacity improvement amount and the performance cost ratio index of the capacity of the phase modulator. The invention not only effectively improves the power transmission capacity of the AC connecting line, promotes the local economic development, but also optimizes the efficiency cost ratio of the installed phase modulator and improves the operation benefit of power grid equipment.
Example 2:
a phase modulation machine configuration device for improving transmission capacity of a new energy high-occupancy-ratio power grid comprises:
the information acquisition module is used for acquiring key faults and safety control strategy information of the key power transmission section of the high-occupancy new energy power grid, which is constrained by steady-state voltage offset;
the candidate installation point calculation module is used for determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information of the key faults;
the optimal configuration place calculation module is used for determining the optimal configuration place of the phase modulator based on the candidate installation points;
the optimal installation capacity calculation module is used for calculating the improvement amount of the transmission capacity of the key section when the phase modulators with different capacities are installed in the optimal configuration place; and calculating the efficiency cost-to-performance ratio for installing the phase modulators with different capacities based on the increased quantity, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators.
Further, determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information thereof, wherein the candidate installation points comprise:
according to the typical operation mode of the high-occupancy new energy power grid and the safety control strategy information, simulating and calculating the voltage of each bus in the system after the safety control measures are considered for the key faults, and according to the voltage offset statistical result, selecting m buses A from large to small according to the voltage offset1、A2…AmAs candidate mount points for the phase modulator.
Further, determining an optimal location for phase modulation machines based on the candidate installation points includes:
respectively simulating and calculating m buses A under a typical operation mode1、A2…AmSet capacity of Q at installation0The lifting amount of the power transmission capacity of the key section is increased after the phase modulator is used, and a bus with the largest lifting amount is selected as an optimal configuration place of the phase modulator.
Further, calculating the improvement amount of the power transmission capacity of the key section when the phase modulators with different capacities are installed in the optimal configuration place, calculating the efficiency cost ratio for installing the phase modulators with different capacities based on the improvement amount, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators, wherein the method comprises the following steps:
respectively simulating and calculating different capacities Q in a typical operation modeiThe phase modulator is arranged at the optimal configuration place, and the lifting amount y of the power transmission capacity of the key section isi(ii) a i is 1,2, …, n, n represents the total number of different phase modulators.
Calculating the performance cost index Ti＝yi/Qi；
Will find TiSorting the values, selecting TiAnd the maximum value of the corresponding phase modulator is used as the optimal installation capacity of the final phase modulator, and the drop point is the optimal configuration place.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (10)
1. A phase modulator configuration method for improving the transmission capacity of a new energy high-occupancy-ratio power grid is characterized by comprising the following steps:
acquiring key faults and safety control strategy information of key power transmission sections of the high-occupancy new energy power grid, which are constrained by steady-state voltage deviation;
determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information of the key faults;
determining an optimal configuration location of the phase modulation machine based on the candidate installation point;
calculating the improvement amount of the power transmission capacity of the key section when phase modulators with different capacities are installed in the optimal configuration place;
and calculating the efficiency cost-to-performance ratio for installing the phase modulators with different capacities based on the increased quantity, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators.
2. The phase modulation machine configuration method for improving the transmission capacity of the new energy high-occupancy-ratio power grid according to claim 1, wherein the candidate installation point of the phase modulation machine is determined through simulation calculation according to the key fault and the safety control strategy information thereof, and the method comprises the following steps:
according to the typical operation mode of the high-occupancy new energy power grid and the safety control strategy information, simulating and calculating the voltage of each bus in the system after the safety control measures are considered for the key faults, and according to the voltage offset statistical result, selecting m buses A from large to small according to the voltage offset1、A2…AmAs candidate mount points for the phase modulator.
3. The phase modulator configuration method for improving the transmission capacity of the new energy high occupancy ratio power grid according to claim 2, wherein the voltage offset is a bus voltage after a fault minus a corresponding voltage limit.
4. The phase modulation machine configuration method for improving the transmission capacity of the new energy high-occupancy-ratio power grid according to claim 2, wherein the step of determining the optimal configuration location of the phase modulation machine based on the candidate installation point comprises the following steps:
respectively simulating and calculating m buses A under a typical operation mode1、A2…AmSet capacity of Q at installation0The lifting amount of the power transmission capacity of the key section is increased after the phase modulator is used, and a bus with the largest lifting amount is selected as an optimal configuration place of the phase modulator.
5. The phase modulator configuration method for improving the transmission capacity of the new energy high-occupancy-ratio power grid according to claim 1, wherein calculating the improvement amount of the transmission capacity of the critical section when phase modulators with different capacities are installed in an optimal configuration place comprises:
respectively simulating and calculating different capacities Q in a typical operation modeiThe phase modulator is arranged at the optimal configuration place, and the lifting amount y of the power transmission capacity of the key section isi(ii) a i is 1,2, …, n, n represents the total number of different phase modulators.
6. The phase modulator configuration method for improving the transmission capacity of the new energy high-occupancy-ratio power grid according to claim 5, wherein the step of calculating the efficiency cost ratios for installing phase modulators with different capacities based on the improvement amount to finally determine the optimal installation capacity and the optimal drop point of the phase modulator comprises the following steps:
calculating the performance cost index Ti＝yi/Qi；
Will find TiSorting the values, selecting TiAnd the maximum value of the corresponding phase modulator is used as the optimal installation capacity of the final phase modulator, and the drop point is the optimal configuration place.
7. The utility model provides a promote phase modulation machine configuration device of new forms of energy high occupation ratio electric wire netting transmission capacity which characterized in that includes:
the information acquisition module is used for acquiring key faults and safety control strategy information of the key power transmission section of the high-occupancy new energy power grid, which is constrained by steady-state voltage offset;
the candidate installation point calculation module is used for determining candidate installation points of the phase modulator through simulation calculation according to the key faults and the safety control strategy information of the key faults;
the optimal configuration place calculation module is used for determining the optimal configuration place of the phase modulator based on the candidate installation points;
the optimal installation capacity calculation module is used for calculating the improvement amount of the transmission capacity of the key section when the phase modulators with different capacities are installed in the optimal configuration place; and calculating the efficiency cost-to-performance ratio for installing the phase modulators with different capacities based on the increased quantity, and finally determining the optimal installation capacity and the optimal drop point of the phase modulators.
8. The phase modulation machine configuration device for improving the transmission capacity of the new energy high-occupancy-ratio power grid according to claim 7, wherein the candidate installation point of the phase modulation machine is determined through simulation calculation according to the key fault and the safety control strategy information thereof, and the method comprises the following steps:
according to the typical operation mode of the high-occupancy new energy power grid and the safety control strategy information, simulating and calculating the voltage of each bus in the system after the safety control measures are considered for the key faults, and according to the voltage offset statistical result, selecting m buses A from large to small according to the voltage offset1、A2…AmAs candidate mount points for the phase modulator.
9. The phase modulation machine configuration device for improving the transmission capacity of the new energy high-occupancy-ratio power grid according to claim 8, wherein the step of determining the optimal configuration location of the phase modulation machine based on the candidate installation point comprises the following steps:
respectively simulating and calculating m buses A under a typical operation mode1、A2…AmSet capacity of Q at installation0The lifting amount of the power transmission capacity of the key section is increased after the phase modulator is used, and a bus with the largest lifting amount is selected as an optimal configuration place of the phase modulator.
10. The phase modulation machine configuration device for improving the transmission capacity of the new energy high-occupancy-ratio power grid according to claim 9, wherein the step of calculating the improvement amount of the transmission capacity of the key section when phase modulation machines with different capacities are installed in the optimal configuration place, calculating the efficiency cost ratio for installing the phase modulation machines with different capacities based on the improvement amount, and finally determining the optimal installation capacity and the drop point of the phase modulation machine comprises:
respectively simulating and calculating different capacities Q in a typical operation modeiThe phase modulator is arranged at the optimal configuration place, and the lifting amount y of the power transmission capacity of the key section isi(ii) a i is 1,2, …, n, n represents the total number of different phase modulators.
Calculating the performance cost index Ti＝yi/Qi；
Will find TiSorting the values, selecting TiAnd the maximum value of the corresponding phase modulator is used as the optimal installation capacity of the final phase modulator, and the drop point is the optimal configuration place.
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| CN113708382A (en) * | 2021-07-13 | 2021-11-26 | 国网西藏电力有限公司经济技术研究院 | Phase modulator site selection method and device based on fault severity minimization |
| CN115293547A (en) * | 2022-07-27 | 2022-11-04 | 华北电力科学研究院有限责任公司 | Phase modulator evaluation method and device |
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| CN110011348A (en) * | 2019-04-04 | 2019-07-12 | 南瑞集团有限公司 | A kind of large capacity VSC converter station phase modifier configuration method and device |
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| CN110011348A (en) * | 2019-04-04 | 2019-07-12 | 南瑞集团有限公司 | A kind of large capacity VSC converter station phase modifier configuration method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113708382A (en) * | 2021-07-13 | 2021-11-26 | 国网西藏电力有限公司经济技术研究院 | Phase modulator site selection method and device based on fault severity minimization |
| CN115293547A (en) * | 2022-07-27 | 2022-11-04 | 华北电力科学研究院有限责任公司 | Phase modulator evaluation method and device |
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