CN110601212A - Method and system for determining main transformer transformation ratio of power grid based on reactive power optimization configuration - Google Patents
Method and system for determining main transformer transformation ratio of power grid based on reactive power optimization configuration 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1878—Arrangements for adjusting, eliminating or compensating reactive power in networks using tap changing or phase shifting transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention discloses a method and a system for determining the main transformer transformation ratio of a power grid based on reactive power optimization configuration, and belongs to the technical field of simulation and calculation of power systems. Selecting main transformers with power factors smaller than a power factor preset value in a target power grid as a plurality of target main transformers for reactive power optimization, monitoring reactive power flow directions of the target main transformers, adjusting the high-voltage side transformation ratios of the target main transformers upwards or downwards, performing switching capacitance or reactance operation on the target main transformers, checking data of the adjusted target main transformers, confirming whether the station voltage of the target main transformers meets the operation requirement, outputting a determined value of the transformation ratio gears of the target main transformers and a power factor value, and determining that reactive power compensation configuration of the target power grid can meet the requirement of reactive power layered balance of the power grid. The method is suitable for safety and stability evaluation of a large-scale power system, has good computability and practicability, and can be used as a main analysis tool for dispatching operation and planning and designing departments.
Description
Technical Field
The invention relates to the technical field of simulation and calculation of power systems, in particular to a method and a system for determining a main transformer ratio of a power grid based on reactive power optimization configuration.
Background
The load distribution of the power grid is influenced by regional economic development factors, the randomness is high, the selection of power supply points is influenced by a plurality of factors such as energy distribution, transportation, environmental protection and the like, and the distribution of the load and the power supply points determines the flow direction of the power. The large-capacity remote transmission of active power flow is a necessary trend of the development of the modern large-area interconnected power grid, and the power flow change of the power grid is more frequent and irregular due to the development trend of electric power marketization. In the operation of the power grid, the long-distance transmission of the reactive power can not only increase the loss of the power transmission network, but also make the voltage level of the power grid difficult to control. Therefore, to maintain the voltage levels at each point, the reactive power source and the reactive load must be substantially balanced at any time in the different voltage class networks and each zone network, thereby avoiding the transmission of a large amount of reactive power by the multi-stage transformer.
In summary, it is necessary to study the reactive characteristics of the provincial power grid under the condition of the extra-high voltage alternating current-direct current hybrid connection and determine a method for selecting the transformation ratio of the 500 kv main transformer of the provincial power grid, so as to ensure that the reactive compensation configuration of the provincial power grid meets the requirements of hierarchical and partitioned balance.
At present, partial research relates to a determination method of a transformation ratio of a 500 kV main transformer, but the method is limited to theoretical analysis and derivation, the calculation process is complicated, and the research result is deficient in practicability.
Disclosure of Invention
The invention provides a method for determining the transformation ratio of a main transformer of a power grid based on reactive power optimization configuration, which aims at the problems, and comprises the following steps:
1.1, acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring power factors, and selecting main transformers with the power factors smaller than a preset value of the power factors as a plurality of target main transformers for reactive power optimization;
2.1, monitoring the reactive power flow direction of a plurality of target main transformers;
2.2, confirming whether the high-voltage side transformation ratio of a plurality of target main transformers meets the operation limitation requirement of the main transformer transformation ratio gears according to the reactive power flow direction, if so, entering 2.3, and if not, entering 3.1;
2.3, adjusting the high-voltage side transformation ratio of a plurality of target main transformers upwards or downwards according to the reactive power flow direction;
2.4, acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring a power factor, determining whether the power factor meets the requirement of being more than or equal to a preset value of the power factor, and if so, entering 4.1; if not, entering 2.2;
3.1, confirming whether the reactive compensation configuration at the low-voltage side of a plurality of target main transformers meets the operation limit requirement of low-voltage reactive compensation capacity;
3.2: switching capacitance or reactance operation is carried out on a plurality of target main transformers according to the flow direction of reactive power;
3.3, acquiring power grid information, building BPA (Business platform Power) power flow data of a target power grid, performing power flow calculation, acquiring a power factor, determining whether the power factor meets the requirement of being more than or equal to a preset value of the power factor, if so, entering 4.1, and if not, entering 3.1;
4.1, checking the adjusted data of the plurality of target main transformers, confirming whether the voltage of the target main transformer station meets the operation requirement, if so, entering 5.1, and if not, entering 4.2;
4.2 according to the voltage limit requirement, determining that the power factor, the ratio gear limit and the low-voltage reactive power configuration capacity meet the requirement, and adjusting the main transformer ratio, the low-voltage reactive power compensation configuration and the reactive power output of the power generator in the nearby area of the station of a plurality of target main transformers with out-of-limit voltage;
and 5.1, outputting a target main transformer transformation ratio gear determination value and a power factor value, and determining that a plurality of target power grid reactive compensation configurations can meet the requirement of the reactive layered balance of the power grid.
Optionally, the power grid information includes: grid structure, generator parameters, load parameters, line parameters, and transformer parameters.
Optionally, 3.3 further includes: and (4) confirming whether all target main transformers are traversed from 1.1 to 3.3, if not, entering a step 2.1, otherwise, entering a step 4.1.
The invention also provides a system for determining the main transformer transformation ratio of the power grid based on reactive power optimization configuration, which comprises the following steps:
the target confirmation module is used for acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring power factors, and selecting main transformers with the power factors smaller than a preset value of the power factors as a plurality of target main transformers for reactive power optimization;
the first monitoring module is used for monitoring the reactive power flow direction of a plurality of target main transformers, confirming whether the high-voltage side transformation ratios of the target main transformers meet the operation limit requirements of the main transformer transformation ratio gears or not according to the reactive power flow direction, upwards adjusting or downwards adjusting the high-voltage side transformation ratios of the target main transformers according to the reactive power flow direction, acquiring power grid information, building BPA (Business platform Business) power flow data of a target power grid, performing power flow calculation, acquiring power factors and determining whether the power factors meet the requirements of being larger than or equal to a preset power factor value or not;
the second monitoring module is used for confirming whether reactive compensation configuration at the low-voltage side of a plurality of target main transformers meets the operation limit requirement of low-voltage reactive compensation capacity or not, switching capacitance or reactance operation is carried out on the plurality of target main transformers according to reactive power flow direction, power grid information is obtained, BPA (Business platform analysis) power flow data of a target power grid are built, power flow calculation is carried out, power factors are obtained, and whether the power factors meet the requirement of being larger than or equal to a preset power factor value or not is determined;
the adjusting module is used for checking the adjusted multiple target main transformer data, confirming whether the voltage of a target main transformer station meets the operation requirement or not, determining that the power factor, the transformer ratio gear limit and the low-voltage reactive power configuration capacity meet the requirements according to the voltage limit requirement, adjusting the main transformer ratio, the low-voltage reactive power compensation configuration and the reactive power output of the station nearby region generator of the multiple target main transformers with out-of-limit voltage, outputting the determined value of the transformer ratio gear of the target main transformer and the power factor value, and determining that the reactive power compensation configuration of multiple target power grids can meet the reactive layered balance requirement of the power grids.
Optionally, the power grid information includes: grid structure, generator parameters, load parameters, line parameters, and transformer parameters.
Optionally, the second monitoring module determines whether all target main transformers are traversed.
The method can accurately position the weak link of reactive power balance of the system, is beneficial to realizing the requirement of reactive power layered balance of the provincial power grid, improves the safety and stability of the operation of the power system, can quickly determine the set gear of the 500 kV main transformer ratio, takes the practical limit conditions of power grid equipment into account in the reactive power optimization process, ensures the practicability of the determination scheme of the 500 kV main transformer ratio, and can provide practical guidance suggestions for the operation and planning personnel of the power system, so the method for determining the main transformer ratio of the provincial power grid based on reactive power optimization configuration has better practical guidance significance and application value.
The method can quickly and accurately locate the weak link of the reactive power balance of the system, is simple to operate, avoids the complex process of part of the existing methods, and improves the speed of simulation calculation;
the invention considers the limiting conditions of the actual equipment of the power grid such as the main transformer transformation ratio gear, the generating set, the low-voltage reactive power configuration capacity and the like in the reactive power optimization process, ensures the practicability of the 500 KV main transformer transformation ratio determination scheme, and can provide actual guidance suggestions for the operation and planning personnel of the power system.
The method is suitable for safety and stability evaluation of a large-scale power system, has good computability and practicability, and can be used as a main analysis tool for dispatching operation and planning and designing departments.
Drawings
FIG. 1 is a flowchart of a method for determining a transformation ratio of a main transformer of a power grid based on reactive power optimization configuration according to the present invention;
fig. 2 is a system structure diagram for determining the main transformer ratio of the power grid based on reactive power optimization configuration.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
The invention provides a method for determining the main transformer transformation ratio of a power grid based on reactive power optimization configuration, which comprises the following steps of:
1.1, acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring power factors, and selecting main transformers with the power factors smaller than a preset value of the power factors as a plurality of target main transformers for reactive power optimization;
grid information, including: grid structure, generator parameters, load parameters, line parameters, and transformer parameters.
2.1, monitoring the reactive power flow direction of a plurality of target main transformers;
2.2, confirming whether the high-voltage side transformation ratio of a plurality of target main transformers meets the operation limitation requirement of the main transformer transformation ratio gears according to the reactive power flow direction, if so, entering 2.3, and if not, entering 3.1;
2.3, adjusting the high-voltage side transformation ratio of a plurality of target main transformers upwards or downwards according to the reactive power flow direction;
2.4, acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring a power factor, determining whether the power factor meets the requirement of being more than or equal to a preset value of the power factor, and if so, entering 4.1; if not, entering 2.2;
3.1, confirming whether the reactive compensation configuration at the low-voltage side of a plurality of target main transformers meets the operation limit requirement of low-voltage reactive compensation capacity;
3.2, performing switching capacitance or reactance operation on a plurality of target main transformers according to the flow direction of the reactive power;
3.3, acquiring power grid information, building BPA power flow data of a target power grid, carrying out power flow calculation, acquiring a power factor, determining whether the power factor meets the requirement that the power factor is larger than or equal to a preset value of the power factor, if so, determining whether 1.1-3.3 traverse all target main transformers, if not, entering step 2.1, otherwise, entering step 4.1.
4.1, checking the adjusted data of the plurality of target main transformers, confirming whether the voltage of the target main transformer station meets the operation requirement, if so, entering 5.1, and if not, entering 4.2;
4.2 according to the voltage limit requirement, determining that the power factor, the ratio gear limit and the low-voltage reactive configuration capacity meet the requirement, and adjusting the main transformer ratio, the low-voltage reactive compensation configuration and the reactive power output of the power generator in the nearby area of the station of a plurality of target main transformers with out-of-limit voltage;
and 5.1, outputting a target main transformer transformation ratio gear determination value and a power factor value, and determining that a plurality of target power grid reactive compensation configurations can meet the requirement of the reactive layered balance of the power grid.
And (4) judging that the current power grid reactive compensation configuration cannot meet the requirement of the power grid layered balance by outputting power factors or sites with voltage levels not meeting the requirement, and recommending to add reactive compensation equipment or change the operation mode of the power grid.
In the following, a target area is taken as an example, the target grid comprises 14 500 kv substations and 4 power plants with 500 kv buses, and the target main transformer is adjusted by using the method described above, taking the 500 kv substations as an example.
Table 8-1 shows the power factor of each 500 kv substation before the adjustment of the target grid, and it can be seen from the table that the power factors of the remaining 500 kv substations are all above 0.9 except for the M station and the N station.
TABLE 8-1
Table 8-2 shows that the reactive power of each target 500 kv main transformer is too large before the target grid is adjusted, and the reactive power of the N station #1 transformer exceeds the active power thereof, so that it is very important to adjust the power factor thereof.
TABLE 8-2
And tables 8-3 and 8-4 show reactive compensation configuration conditions and transformation ratio selection conditions of each target 500 kV main transformer before target power grid adjustment.
Tables 8 to 3
Tables 8 to 4
Tables 8-5 show the power and power factor of each target 500 kv main transformer after the target grid is adjusted, and it can be known from the tables that the power factors of each main transformer of the N station and the M station are greatly improved, the reactive power is kept in a reasonable range, and the principle of layered balance of the power system is ensured.
Tables 8 to 5
Tables 8-6 and 8-7 show the reactive compensation configuration condition and the high-voltage side transformation ratio selection condition of each target 500 kV main transformer after the target power grid is adjusted. It can be known from the table that the reactive compensation and the high-voltage side transformation ratio of each 500 kv target main transformer are changed, and the reactive compensation capacity still changes greatly after the high-voltage side transformation ratio of the main transformer is adjusted at first, which explains to a certain extent that adjusting the reactive compensation capacity is one of the effective means for improving the power factor of the main transformer.
Tables 8 to 6
Tables 8 to 7
The voltage range of the adjusted power grid of the target area is 500.5-527.3, the power grid meets the requirements of the power grid, and the voltage of the generator terminal, reactive power output and other power grid limits meet the requirements.
The invention further provides a system 200 for determining a main transformation ratio of a power grid based on reactive power optimization configuration, as shown in fig. 2, comprising:
the target confirmation module 201 is used for acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring power factors, and selecting main transformers with the power factors smaller than a preset value of the power factors as a plurality of target main transformers for reactive power optimization;
grid information, including: grid structure, generator parameters, load parameters, line parameters, and transformer parameters.
The first monitoring module 202 is used for monitoring the reactive power flow direction of a plurality of target main transformers, confirming whether the high-voltage side transformation ratio of the target main transformers meets the operation limitation requirement of the main transformer transformation ratio gears according to the reactive power flow direction, upwards or downwards regulating the high-voltage side transformation ratio of the target main transformers according to the reactive power flow direction, acquiring power grid information, building BPA (Business Process analysis) power flow data of the target power grid, performing power flow calculation, acquiring power factors and determining whether the power factors meet the requirement of being more than or equal to a preset power factor value;
the second monitoring module 203 confirms whether reactive compensation configuration at the low-voltage side of a plurality of target main transformers meets the operation limit requirement of low-voltage reactive compensation capacity, performs switching capacitance or reactance operation on the plurality of target main transformers according to reactive power flow direction, acquires power grid information, builds BPA (Business Process platform) power flow data of a target power grid, performs power flow calculation, acquires power factors, determines whether the power factors meet the requirement of being more than or equal to a preset power factor value, and confirms whether all the target main transformers are traversed.
The adjusting module 204 checks the adjusted multiple target main transformer data, confirms whether the voltage of a target main transformer station meets the operation requirement, determines that the power factor, the transformer ratio gear limit and the low-voltage reactive power configuration capacity meet the requirements according to the voltage limit requirement, adjusts the main transformer ratio, the low-voltage reactive power compensation configuration and the reactive power output of the station nearby region generator of the multiple target main transformers with out-of-limit voltage, outputs the determined value of the transformer ratio gear of the target main transformer and the value of the power factor, and determines that the reactive power compensation configuration of multiple target power grids can meet the reactive layered balance requirement of the power grids.
The method can accurately position the weak link of reactive power balance of the system, is beneficial to realizing the requirement of reactive power layered balance of the provincial power grid, improves the safety and stability of the operation of the power system, can quickly determine the set gear of the 500 kV main transformer ratio, takes the practical limit conditions of power grid equipment into account in the reactive power optimization process, ensures the practicability of the determination scheme of the 500 kV main transformer ratio, and can provide practical guidance suggestions for the operation and planning personnel of the power system, so the method for determining the main transformer ratio of the provincial power grid based on reactive power optimization configuration has better practical guidance significance and application value.
The method can quickly and accurately locate the weak link of the reactive power balance of the system, is simple to operate, avoids the complex process of part of the existing methods, and improves the speed of simulation calculation;
the invention considers the limiting conditions of the actual equipment of the power grid such as the main transformer transformation ratio gear, the generating set, the low-voltage reactive power configuration capacity and the like in the reactive power optimization process, ensures the practicability of the 500 KV main transformer transformation ratio determination scheme, and can provide actual guidance suggestions for the operation and planning personnel of the power system.
The method is suitable for safety and stability evaluation of a large-scale power system, has good computability and practicability, and can be used as a main analysis tool for dispatching operation and planning and designing departments.
Claims (6)
1. A method for determining a main transformer ratio of a power grid based on reactive power optimization configuration, the method comprising:
1.1, acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring power factors, and selecting main transformers with the power factors smaller than a preset value of the power factors as a plurality of target main transformers for reactive power optimization;
2.1, monitoring the reactive power flow direction of a plurality of target main transformers;
2.2, confirming whether the high-voltage side transformation ratio of a plurality of target main transformers meets the operation limitation requirement of the main transformer transformation ratio gears according to the reactive power flow direction, if so, entering 2.3, and if not, entering 3.1;
2.3, adjusting the high-voltage side transformation ratio of a plurality of target main transformers upwards or downwards according to the reactive power flow direction;
2.4, acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring a power factor, determining whether the power factor meets the requirement of being more than or equal to a preset value of the power factor, and if so, entering 4.1; if not, entering 2.2;
3.1, confirming that the reactive compensation configuration at the low-voltage side of a plurality of target main transformers meets the operation limit requirement of low-voltage reactive compensation capacity;
3.2, performing switching capacitance or reactance operation on a plurality of target main transformers according to the flow direction of the reactive power;
3.3, acquiring power grid information, building BPA (Business platform Power) power flow data of a target power grid, performing power flow calculation, acquiring a power factor, determining whether the power factor meets the requirement of being more than or equal to a preset value of the power factor, if so, entering 4.1, and if not, entering 3.1;
4.1, checking the adjusted data of the plurality of target main transformers, confirming whether the voltage of the target main transformer station meets the operation requirement, if so, entering 5.1, and if not, entering 4.2;
4.2 according to the voltage limit requirement, determining that the power factor, the ratio gear limit and the low-voltage reactive configuration capacity meet the requirement, and adjusting the main transformer ratio, the low-voltage reactive compensation configuration and the reactive power output of the power generator in the nearby area of the station of a plurality of target main transformers with out-of-limit voltage;
and 5.1, outputting a target main transformer transformation ratio gear determination value and a power factor value, and determining that the target power grid reactive compensation configuration can meet the requirement of the reactive layered balance of the power grid.
2. The method of claim 1, wherein the grid information comprises: grid structure, generator parameters, load parameters, line parameters, and transformer parameters.
3. The method of claim 1, said 3.3 further comprising: and (4) confirming whether all target main transformers are traversed from 1.1 to 3.3, if not, entering a step 2.1, otherwise, entering a step 4.1.
4. A system for determining a main transformer ratio of a power grid based on a reactive power optimization configuration, the system comprising:
the target confirmation module is used for acquiring power grid information, building BPA (Business Process analysis) power flow data of a target power grid, performing power flow calculation, acquiring power factors, and selecting main transformers with the power factors smaller than a preset value of the power factors as a plurality of target main transformers for reactive power optimization;
the first monitoring module is used for monitoring the reactive power flow direction of a plurality of target main transformers, confirming whether the high-voltage side transformation ratios of the target main transformers meet the operation limit requirements of the main transformer transformation ratio gears or not according to the reactive power flow direction, upwards adjusting or downwards adjusting the high-voltage side transformation ratios of the target main transformers according to the reactive power flow direction, acquiring power grid information, building BPA (Business platform Business) power flow data of a target power grid, performing power flow calculation, acquiring power factors and determining whether the power factors meet the requirements of being larger than or equal to a preset power factor value or not;
the second monitoring module is used for confirming whether reactive compensation configuration at the low-voltage side of a plurality of target main transformers meets the operation limit requirement of low-voltage reactive compensation capacity or not, switching capacitance or reactance operation is carried out on the plurality of target main transformers according to reactive power flow direction, power grid information is obtained, BPA (Business platform analysis) power flow data of a target power grid are built, power flow calculation is carried out, power factors are obtained, and whether the power factors meet the requirement of being larger than or equal to a preset power factor value or not is determined;
the adjusting module is used for checking the adjusted multiple target main transformer data, confirming whether the voltage of a target main transformer station meets the operation requirement, determining that the power factor, the transformer ratio gear limit and the low-voltage reactive power configuration capacity meet the requirements according to the voltage limit requirement, adjusting the main transformer ratio, the low-voltage reactive power compensation configuration and the reactive power output of the station nearby region generator of the multiple target main transformers with out-of-limit voltage, outputting a target main transformer ratio gear determination value and a power factor value, and determining that the target power grid reactive power compensation configuration can meet the requirement of the reactive power layered balance of the power grid.
5. The system of claim 4, wherein the grid information comprises: grid structure, generator parameters, load parameters, line parameters, and transformer parameters.
6. The system of claim 3, wherein said second monitoring module determines whether all target master variants are traversed.
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| CN112736990A (en) * | 2020-12-02 | 2021-04-30 | 邯郸钢铁集团有限责任公司 | Method for adjusting reactive power balance of power generation and utilization system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105490281A (en) * | 2015-12-04 | 2016-04-13 | 国网内蒙古东部电力有限公司电力科学研究院 | Layered and zoned reactive voltage analysis method based on boundary condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105490281A (en) * | 2015-12-04 | 2016-04-13 | 国网内蒙古东部电力有限公司电力科学研究院 | Layered and zoned reactive voltage analysis method based on boundary condition |
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| CN112736990A (en) * | 2020-12-02 | 2021-04-30 | 邯郸钢铁集团有限责任公司 | Method for adjusting reactive power balance of power generation and utilization system |
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