CN104979836A - Power grid reactive compensation method and system - Google Patents
Power grid reactive compensation method and system Download PDFInfo
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Abstract
The invention discloses a power grid reactive compensation method and system. The system includes a voltage monitor, a current monitor, an operation module, a logic analysis module, a reactive compensation device, a feedback module, and a man-machine interaction module. The voltage monitor and the current monitor are wirelessly connected to the operation module. The operation module is connected to the logic analysis module and the feedback module. The logic analysis module is connected to the feedback module, the reactive compensation device and the man-machine interaction module. The reactive compensation device is connected to the feedback module. Through the power grid reactive compensation method and system, control compensation can be carried out for the reactive power of a user terminal level, a sub-net level and a whole-net level, and power factors of all levels of a power grid are increased.
Description
Technical field
The present invention relates to electrical network field of energy-saving technology, especially a kind of power grid reactive compensation method and system.
Background technology
Along with the high speed development of national economy and the raising of living standards of the people, the demand of people to electric power is growing, has higher requirement to the reliability of powering and power supply quality simultaneously.Due to the continuous increase of load, and the significantly increase of power supply, not only change the network configuration of electric power system, have also been changed the power distribution of system, cause the reactive power distribution of system unreasonable, even may cause the idle wretched insufficiency in some areas, situation that voltage levvl is generally lower.
Quality of voltage is one of important indicator of electric power quality, and whether its quality depends primarily on power system reactive power compensation reasonable.But because network system is huge, the kind of reactive power and distribution are extremely complicated, this proposes a very large difficult problem with regard to giving the reactive power compensation of electrical network.How to make different Measures of Reactive Compensations fast for different situations, be focus and the difficult point of this area research always.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of power grid reactive compensation method and system, can for dissimilar reactive power, the different strategy of automatic use carries out reactive power compensation, and carry out strategy correction by data feedback, improve the reactive power compensation efficiency of each level of electrical network, improve power factor.
For solving the problems of the technologies described above, the technical solution used in the present invention is:
A kind of power grid reactive compensation method, comprises the steps:
A, utilize and be laid in voltage monitor and the electric current monitor of each power network monitoring point, the magnitude of voltage of this power network monitoring point of real-time collecting and current value, and the magnitude of voltage collected and current value are sent to computing module;
The magnitude of voltage of each power network monitoring point received and current value store by B, computing module, and the data timing of storage is carried out computing, obtain average power factor Data Concurrent and deliver to logic analysis module;
Average power factor in step B is carried out compressive classification by C, logic analysis module, and generates different control strategies according to classification results, and the control strategy of this generation puts on reactive-load compensator to carry out reactive power compensation;
Average power factor before the reactive power compensation be sent in average power factor after reactive power compensation and step B in logic analysis module compares by D, feedback module, and revises the control strategy that logic analysis module puts on reactive-load compensator according to this comparative result;
What in the classification results that logic analysis module in step C is made by E, human-computer interaction module respectively and step D, logic analysis module was made shows the control strategy of reactive-load compensator, if monitor staff finds that mistake appears in this control strategy, namely pass through human-computer interaction module manual correction to the control strategy of reactive-load compensator.
Further, in step B, computing module carries out once-through operation to the data stored in every 1 minute, draws average power factor data.
Further, in step C, logic analysis module carries out compressive classification to average power factor and comprises the following steps:
C-1, the average power factor deriving from same monitoring point is defined as user terminal level average power factor;
C-2, the ratio of each user terminal capacity and its place distribution transformer capacity is defined as the weighted factor of this user terminal, weighted factor sums all under same distribution transformer equals 1, is sub-network level average power factor by the user terminal level average power factor mean value definition be multiplied by after its corresponding weighted factor deriving from same distribution transformer;
C-3, the ratio of each subnet capacity and the whole network capacity is defined as the weighted factor of this subnet, all subnet weighted factor sums equal 1, are the whole network level average power factor by the sub-network level average power factor of the whole network mean value definition be multiplied by after its corresponding weighted factor.
Further, for the reactive power of user terminal level, start shunt capacitor or series capacitor or shunt reactor and carry out reactive power compensation; For the reactive power of sub-network level, start shunt capacitor or series capacitor or shunt reactor or static compensator and carry out reactive power compensation; For the reactive power of the whole network level, start synchronous compensator or static compensator or active filter and carry out reactive power compensation.
Further, in step D, feedback module adopts pid algorithm correction logic analysis module to the control strategy of reactive-load compensator.
A kind of electric network reactive compensation system, comprises voltage monitor and electric current monitor, computing module, logic analysis module, reactive-load compensator, feedback module and human-computer interaction module; Wherein, voltage monitor and electric current monitor respectively by wireless connections in computing module, computing module is connected with feedback module with logic analysis module respectively, logic analysis module is connected with human-computer interaction module with feedback module, reactive-load compensator respectively, and reactive-load compensator is connected with feedback module; Each power network monitoring point is laid with a pair voltage monitor and electric current monitor, is respectively used to gather the magnitude of voltage of this power network monitoring point and current value and is sent to computing module; Computing module is used for the magnitude of voltage of each power network monitoring point received and current value being averaged power factor calculating and the average power factor calculated being sent to logic analysis module; The average power factor received is carried out compressive classification by logic analysis module, and produces the control strategy for controlling reactive-load compensator work according to classification results; Reactive-load compensator, for performing this control strategy, compensates reactive power; Average power factor before feedback module is used for the power factor of electric network after to compensation and compensates compares and instructs logic analysis module correction to put on the control strategy of reactive-load compensator according to comparative result; Human-computer interaction module is used for the classification results that real-time display logic analysis module is made and the control strategy putting on reactive-load compensator, and carries out manual correction to the control strategy of mistake.
Further, wireless telecommunications mechanism is respectively arranged with in described voltage monitor, electric current monitor and computing module.
Further, described wireless telecommunications mechanism is remote-wireless bridge.
Further, described reactive-load compensator comprises synchronous compensator, shunt capacitor, series capacitor, shunt reactor, static compensator and active filter.
The beneficial effect adopting technique scheme to produce is:
The power grid reactive compensation method of the application of the invention and system, can carry out control and compensation respectively to three grades of reactive powers of user terminal level, sub-network level and the whole network level, achieve the raising of the power factor of each level of electrical network, experimental data sees the following form:
1. only user terminal level reactive power is compensated
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.97 | 0.94 | 0.9 |
2. only sub-network level reactive power is compensated
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.95 | 0.96 | 0.93 |
3. only the whole network level reactive power is compensated
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.94 | 0.95 | 0.96 |
4. three grades of reactive powers of user terminal level, sub-network level and the whole network level are compensated respectively
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.96 | 0.97 | 0.98 |
As can be seen from above-mentioned experimental data, after the three grades of reactive powers adopting power grid reactive compensation method of the present invention and system to carry out user terminal level, sub-network level and the whole network level compensate respectively, the power factor of each level of electrical network has had significant raising.
In addition, the present invention will be preferably 1 minute sample time, both take into account the ageing of sampling, turn avoid reactive-load compensator frequent start-stop, extend the useful life of reactive-load compensator.Feedback module adopts pid algorithm, and the regulation time making system each shortens 1 times.Further, the present invention, according to the feature of electrical network various level reactive power, chooses different reactive-load compensators, reduces the input amount of equipment funds.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of electric network reactive compensation system of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Referring to accompanying drawing 1, a kind of electric network reactive compensation system, comprises voltage monitor and electric current monitor, computing module, logic analysis module, reactive-load compensator, feedback module and human-computer interaction module; Be respectively arranged with wireless telecommunications mechanism in voltage monitor, electric current monitor and computing module, and wireless telecommunications mechanism can be remote-wireless bridge; Wherein, voltage monitor and electric current monitor respectively by wireless connections in computing module, computing module is connected with feedback module with logic analysis module respectively, logic analysis module is connected with human-computer interaction module with feedback module, reactive-load compensator respectively, and reactive-load compensator is connected with feedback module; Each power network monitoring point is laid with a pair voltage monitor and electric current monitor, is respectively used to gather the magnitude of voltage of this power network monitoring point and current value and is sent to computing module; Computing module is used for the magnitude of voltage of each power network monitoring point received and current value being averaged power factor calculating and the average power factor calculated being sent to logic analysis module; The average power factor received is carried out compressive classification by logic analysis module, and produces the control strategy for controlling reactive-load compensator work according to classification results; Reactive-load compensator, for performing this control strategy, compensates reactive power; Average power factor before feedback module is used for the power factor of electric network after to compensation and compensates compares and instructs logic analysis module correction to put on the control strategy of reactive-load compensator according to comparative result; Human-computer interaction module is used for the classification results that real-time display logic analysis module is made and the control strategy putting on reactive-load compensator, and carries out manual correction to the control strategy of mistake.Reactive-load compensator comprises synchronous compensator, shunt capacitor, series capacitor, shunt reactor, static compensator and active filter.
The method step adopting above-mentioned electric network reactive compensation system to carry out electric network reactive compensation is as follows:
A, utilize and be laid in voltage monitor and the electric current monitor of each power network monitoring point, the magnitude of voltage of this power network monitoring point of real-time collecting and current value, and the magnitude of voltage collected and current value are sent to computing module;
The magnitude of voltage of each power network monitoring point received and current value store by B, computing module, and the data timing of storage is carried out computing, as every 1 minute, once-through operation is carried out to the data stored, draw average power factor data, then computing module will calculate average power factor Data Concurrent and deliver to logic analysis module;
Average power factor in step B is carried out compressive classification by C, logic analysis module, and generates different control strategies according to classification results, and the control strategy of this generation puts on reactive-load compensator to carry out reactive power compensation;
In step C, logic analysis module carries out compressive classification to average power factor and specifically comprises the following steps:
C-1, the average power factor deriving from same monitoring point is defined as user terminal level average power factor;
C-2, the ratio of each user terminal capacity and its place distribution transformer capacity is defined as the weighted factor of this user terminal, weighted factor sums all under same distribution transformer equals 1, is sub-network level average power factor by the user terminal level average power factor mean value definition be multiplied by after its corresponding weighted factor deriving from same distribution transformer;
C-3, the ratio of each subnet capacity and the whole network capacity is defined as the weighted factor of this subnet, all subnet weighted factor sums equal 1, are the whole network level average power factor by the sub-network level average power factor of the whole network mean value definition be multiplied by after its corresponding weighted factor.
In step C, concrete control strategy is:
For the reactive power of user terminal level, start shunt capacitor or series capacitor or shunt reactor and carry out reactive power compensation; For the reactive power of sub-network level, start shunt capacitor or series capacitor or shunt reactor or static compensator and carry out reactive power compensation; For the reactive power of the whole network level, start synchronous compensator or static compensator or active filter and carry out reactive power compensation.
Average power factor before the reactive power compensation be sent in average power factor after reactive power compensation and step B in logic analysis module compares by D, feedback module, and adopts pid algorithm to revise the control strategy that logic analysis module puts on reactive-load compensator according to this comparative result;
What in the classification results that logic analysis module in step C is made by E, human-computer interaction module respectively and step D, logic analysis module was made shows the control strategy of reactive-load compensator, if monitor staff finds that mistake appears in this control strategy, namely pass through human-computer interaction module manual correction to the control strategy of reactive-load compensator.
Operation principle of the present invention is: power grid reactive compensation method of the present invention and system can carry out control and compensation respectively to three grades of reactive powers of user terminal level, sub-network level and the whole network level, achieve the raising of the power factor of each level of electrical network.Experimental data sees the following form:
1. only user terminal level reactive power is compensated
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.97 | 0.94 | 0.9 |
2. only sub-network level reactive power is compensated
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.95 | 0.96 | 0.93 |
3. only the whole network level reactive power is compensated
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.94 | 0.95 | 0.96 |
4. three grades of reactive powers of user terminal level, sub-network level and the whole network level are compensated respectively
| User terminal power factor | Subnet power factor | The whole network power factor |
| 0.96 | 0.97 | 0.98 |
As can be seen from the experimental data in above-mentioned four forms, after adopting three grades of reactive powers of power grid reactive compensation method of the present invention and system of users terminating stage, sub-network level and the whole network level to compensate respectively, the power factor of each level of electrical network has had significant raising.
In addition, the present invention will be preferably 1 minute sample time, both take into account the ageing of sampling, turn avoid reactive-load compensator frequent start-stop, extend the useful life of reactive-load compensator.Feedback module adopts pid algorithm, and the regulation time making system each shortens 1 times.Further, the present invention, according to the feature of electrical network various level reactive power, chooses different reactive-load compensators, reduces the input amount of equipment funds.
Claims (9)
1. a power grid reactive compensation method, is characterized in that, the method comprises the steps:
A, utilize and be laid in voltage monitor and the electric current monitor of each power network monitoring point, the magnitude of voltage of this power network monitoring point of real-time collecting and current value, and the magnitude of voltage collected and current value are sent to computing module;
The magnitude of voltage of each power network monitoring point received and current value store by B, computing module, and the data timing of storage is carried out computing, obtain average power factor Data Concurrent and deliver to logic analysis module;
Average power factor in step B is carried out compressive classification by C, logic analysis module, and generates different control strategies according to classification results, and the control strategy of this generation puts on reactive-load compensator to carry out reactive power compensation;
Average power factor before the reactive power compensation be sent in average power factor after reactive power compensation and step B in logic analysis module compares by D, feedback module, and revises the control strategy that logic analysis module puts on reactive-load compensator according to this comparative result;
What in the classification results that logic analysis module in step C is made by E, human-computer interaction module respectively and step D, logic analysis module was made shows the control strategy of reactive-load compensator, if monitor staff finds that mistake appears in this control strategy, namely pass through human-computer interaction module manual correction to the control strategy of reactive-load compensator.
2. power grid reactive compensation method according to claim 1, is characterized in that: in step B, and computing module carries out once-through operation to the data stored in every 1 minute, draws average power factor data.
3. power grid reactive compensation method according to claim 1, is characterized in that: in step C, and logic analysis module carries out compressive classification to average power factor and comprises the following steps:
C-1, the average power factor deriving from same monitoring point is defined as user terminal level average power factor;
C-2, the ratio of each user terminal capacity and its place distribution transformer capacity is defined as the weighted factor of this user terminal, weighted factor sums all under same distribution transformer equals 1, is sub-network level average power factor by the user terminal level average power factor mean value definition be multiplied by after its corresponding weighted factor deriving from same distribution transformer;
C-3, the ratio of each subnet capacity and the whole network capacity is defined as the weighted factor of this subnet, all subnet weighted factor sums equal 1, are the whole network level average power factor by the sub-network level average power factor of the whole network mean value definition be multiplied by after its corresponding weighted factor.
4. power grid reactive compensation method according to claim 3, is characterized in that: for the reactive power of user terminal level, starts shunt capacitor or series capacitor or shunt reactor and carries out reactive power compensation; For the reactive power of sub-network level, start shunt capacitor or series capacitor or shunt reactor or static compensator and carry out reactive power compensation; For the reactive power of the whole network level, start synchronous compensator or static compensator or active filter and carry out reactive power compensation.
5. power grid reactive compensation method according to claim 1, is characterized in that: in step D, and feedback module adopts pid algorithm correction logic analysis module to the control strategy of reactive-load compensator.
6. an electric network reactive compensation system, is characterized in that: comprise voltage monitor and electric current monitor, computing module, logic analysis module, reactive-load compensator, feedback module and human-computer interaction module; Wherein, voltage monitor and electric current monitor respectively by wireless connections in computing module, computing module is connected with feedback module with logic analysis module respectively, logic analysis module is connected with human-computer interaction module with feedback module, reactive-load compensator respectively, and reactive-load compensator is connected with feedback module;
Each power network monitoring point is laid with a pair voltage monitor and electric current monitor, is respectively used to gather the magnitude of voltage of this power network monitoring point and current value and is sent to computing module; Computing module is used for the magnitude of voltage of each power network monitoring point received and current value being averaged power factor calculating and the average power factor calculated being sent to logic analysis module; The average power factor received is carried out compressive classification by logic analysis module, and produces the control strategy for controlling reactive-load compensator work according to classification results; Reactive-load compensator, for performing this control strategy, compensates reactive power; Average power factor before feedback module is used for the power factor of electric network after to compensation and compensates compares and instructs logic analysis module correction to put on the control strategy of reactive-load compensator according to comparative result; Human-computer interaction module is used for the classification results that real-time display logic analysis module is made and the control strategy putting on reactive-load compensator, and carries out manual correction to the control strategy of mistake.
7. electric network reactive compensation system according to claim 6, is characterized in that: be respectively arranged with wireless telecommunications mechanism in described voltage monitor, electric current monitor and computing module.
8. electric network reactive compensation system according to claim 7, is characterized in that: described wireless telecommunications mechanism is remote-wireless bridge.
9. electric network reactive compensation system according to claim 6, is characterized in that: described reactive-load compensator comprises synchronous compensator, shunt capacitor, series capacitor, shunt reactor, static compensator and active filter.
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| CN105914750A (en) * | 2016-05-11 | 2016-08-31 | 广东电网有限责任公司汕头供电局 | Power distribution network low voltage variable coefficient control method and system |
| CN107910904A (en) * | 2017-11-23 | 2018-04-13 | 南京理工大学 | High voltage direct current synchronous capacitor starts grid-connection control system and its control method |
| CN108616130A (en) * | 2018-05-15 | 2018-10-02 | 山东大学 | The improved micro-capacitance sensor builtin voltage partition control method based on droop method control |
| CN108964135A (en) * | 2018-09-14 | 2018-12-07 | 东北大学 | A kind of micro-capacitance sensor distributed economic dispatch device and method considering communication delay |
| CN111668854A (en) * | 2020-05-18 | 2020-09-15 | 安徽徽电科技股份有限公司 | Compensation system for medium-high voltage power grid |
| CN112886605A (en) * | 2021-01-28 | 2021-06-01 | 广州安能特电气设备有限公司 | Reactive compensation method and device |
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| CN108964135A (en) * | 2018-09-14 | 2018-12-07 | 东北大学 | A kind of micro-capacitance sensor distributed economic dispatch device and method considering communication delay |
| CN108964135B (en) * | 2018-09-14 | 2021-06-08 | 东北大学 | Micro-grid distributed economic dispatching device and method considering communication time lag |
| CN111668854A (en) * | 2020-05-18 | 2020-09-15 | 安徽徽电科技股份有限公司 | Compensation system for medium-high voltage power grid |
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