CN103825287A - Quick dynamic reactive-power compensating method of combined electrical load - Google Patents
Quick dynamic reactive-power compensating method of combined electrical load Download PDFInfo
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- CN103825287A CN103825287A CN201410093069.3A CN201410093069A CN103825287A CN 103825287 A CN103825287 A CN 103825287A CN 201410093069 A CN201410093069 A CN 201410093069A CN 103825287 A CN103825287 A CN 103825287A
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- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The invention provides a quick dynamic reactive-power compensating method of combined electrical load. The method is characterized in that a power electronic power converter (12) is controlled by an intelligent controller (7) to change the current and the impedance of a secondary winding of a variable reactor (11), so as to change the current and the impedance of a primary winding of the variable reactor (11); the fundamental current is changed by changing the admittance of the variable reactor when the input voltage is unchanged, so that the change of the variable reactor absorbing reactive power is caused; when an adjustable capacitor bank (5) is controlled by the intelligent controller and the target power factor is compensated, an inductive reactance convertor (6) can slide to adjust the reactive power in cooperation with the adjustable capacitor bank; therefore, the dynamic reactive-power compensation of the combined electrical load is realized. The method can realize real-time analysis and extraction of reactive power and reactive current under different load conditions, so as to realize intelligent control of the optimal quick reactive-power compensation; and the method can be used for quick reactive-power compensation of the combined high-voltage electrical load in the industries such as metallurgy, building materials, petrifaction and the like.
Description
Technical field
The present invention relates to dynamic passive compensation field, particularly relate to a kind of dynamic reactive fast-compensation method of composite electric load.
Background technology
Along with the development of electric power system, various novel impact loads (as industrial arc, electric locomotive, rolling mill etc.) make on low-voltage network voltage fluctuation frequent, large-scale semiconductor rectifier equipment etc. causes harmonic wave in electrical network, make quality of voltage variation, affected the work of miscellaneous equipment in electrical network.Meanwhile, there is (as semiconductor manufacturing factory etc.) in new sensitive equipment, the quality of power supply is had higher requirement in a large number.Therefore, in the urgent need to improving the control appliance of the quality of power supply.
Reactive power compensation technology mainly comprises capacitor compensation (FC), synchronous compensator, saturable reactor (SR), mechanical switching capacitance (MSC), Static Var Compensator (SVC), advanced Static Var Compensator (ACVG) etc. at present.Early stage reactive-load compensation method is synchronous compensator and fixed compensation capacitor device, and the former operating cost is high, and complexity is installed, and the latter's compensation capacity has level, but can not regulate continuously, and likely resonance occurs.Synchronous compensator compensation way does not re-use in current reactive power compensation project.Mechanical switch opening-closing capacitor bank (MSC) is a kind of fairly simple reactive-load compensation method, gradable, grouping switching, but it can not be adjustable continuously.About static reacance power compensating method, although in research, have both at home and abroad about main loop unit, thyristor valve, trigger control unit, power conversion unit, the control system of Static Var Compensator and the research that adopts the controlled reactor of transformer to compensate distribution side reactive power, all different from " the dynamic reactive fast-compensation method of the composite electric load " method in the present invention.
Electric power system is a close coupling, nonlinear complication system, is difficult to realize robustness control with traditional control method.Therefore, composite electric load dynamic reactive fast-compensation method provided by the invention is intended the design feature of the continuous adjustable and induction reactance converter high and low pressure isolation of the adjustable induction reactance converter of fully utilization capacitive reactance variable adjustable condenser group, induction reactance, electronic power converter, dynamically tracking reactive power changes, and makes distribution system or the dynamic equilibrium of electrical load reactive requirement; Regulate reactive-load compensator parameter by intelligent controller, realize the reactance value that carrys out dynamic regulation high voltage main circuit with the electric and electronic power translation circuit of low-voltage, thereby realize, the dynamic reactive of distribution system or electrical load is compensated fast.
The disclosed technical scheme of Chinese patent literature " Static Var Compensator (200920087271.X) based on variable reactance " is: it is by intelligent controller control variable reactor, change the electric current that flows through variable reactor, thereby reactive-load compensator circuit absorbed or send reactive power, realizing the object of load dynamic reactive power compensation.But this compensator is mainly used in static reactive power compensation, there is limitation in composite electric load field.
Summary of the invention
Technical problem to be solved by this invention is: the limitation for existing reactive power compensation technology for composite electric load, a kind of dynamic reactive fast-compensation method of composite electric load is provided, the method is mainly for the situation of the power real-time change of composite electric load, can carry out dynamic reactive and compensate fast, thereby solve intelligent grid (distribution system or electrical load) composite electric load reactive power scientific and technical difficult problem for compensation fast.
The present invention solves its technical problem and adopts following technical scheme:
The dynamic reactive fast-compensation method of composite electric load provided by the invention, specifically: by intelligent controller control electronic power converter, change electric current and the impedance of the secondary winding of variable reactor, thereby change electric current and the impedance of a winding of variable reactance converter; In the time that input voltage is constant, realize the change of variable reactor admittance, just can change fundamental current, thereby cause the variation of variable reactor absorbing reactive power; Adjustable condenser group is by intelligent controller control and while compensating to target power factor, and induction reactance converter coordinates adjustable condenser group, can smooth adjustment reactive power, realize the dynamic passive compensation of composite electric load.
The dynamic reactive fast-compensation method of above-mentioned composite electric load provided by the invention, its step can be:
1) start operation:
Give after the main circuit and control loop power supply in electric power system, arrange after corresponding operational factor, by start button, system enters operation; Described corresponding operational factor comprises power factor, active power, reactive power, voltage and current parameter;
2) detected transmission:
The voltage and current signal being extracted by voltage current transformer is changed through intelligent electric energy detection module, obtains the digital signal of required corresponding operational factor, then sends into intelligent controller by RS485 bus;
3) analytical calculation:
The digital signal collecting by intelligent controller real-time analysis, calculates needed compensating power size, determines the capacity of input compensation capacitor;
4) send idle:
According to the capacity of input compensation capacitor, intelligent controller is by the closure of control contactor, and switching adjustable condenser group is sent idlely to electric power system, approach desired value to improve power factor; In the time that power factor meets the demands, return to step 2), otherwise proceed to step 5);
5) absorb idle:
In the time of overcompensation, export control signal to electronic power converter by intelligent controller, regulate the induction reactance of induction reactance converter, with absorbing reactive power, make power factor maintain desired value.
Through above-mentioned steps, induction reactance converter coordinates adjustable condenser group, can smooth adjustment reactive power, realize the dynamic passive compensation of composite electric load.
Described switching adjustable condenser group, sends idle method to electric power system and can be: intelligent controller is determined will send idle Q to electric power system
0after, closed or the disconnection of this intelligent controller control contactor KM11～contactor KM1n, drop into or excise the capacitor in the tunable capacitor group being formed by the series circuit of organizing fast acting fuse, capacitor switching contactor and capacitor after parallel connection more, the actual capacitance that regulates access electric power system, sends idle Q to electric power system
c.
The induction reactance of described adjusting induction reactance converter, method with absorbing reactive power can be: induction reactance converter is connected to the grid after being connected with the end of incoming cables of the first side winding of variable reactor by contactor, the secondary side winding of variable reactor is connected with electronic power converter, intelligent controller calculates after will absorb idle, control electronic power converter, the actual inductance value that just can regulate access electric power system, absorbs idle Q from electric power system
l.
Described step 1) to the control method for coordinating between step 5) can be realized by PLC control system.
The realization of described PLC control system control method for coordinating is: the closure by the transmission of control signal and data-signal between data communication, touch-screen and PLC controller between the connected PLC controller of power supply and electrical energy parameter acquisition module, PLC controller by I/O interface circuit control contactor or disconnection, PLC controller are controlled trigger board by analog output module.
Described Q
0, Q
cand Q
lalgebraical sum can be close to 0.
The dynamic reactive fast-compensation method of above-mentioned composite electric load provided by the invention, its purposes is: the application in the Quick reactive-load compensation of high pressure composite electric load that comprises metallurgy, building materials or petrochemical industry field.
The present invention compared with prior art has following major advantage:
Composite electric load dynamic reactive fast-compensation method provided by the invention, by dynamic reactive real-time current detection method, realizes composite electric load dynamic reactive and compensates fast.
Specific as follows:
(1) power electronics emotional resistance transformer configuration, adopts high and low pressure isolation method, has reduced power electric component voltage withstand class and requirement and environment for use;
(2) intelligent sensor and controller reactive power and the reactive current to composite electric load carried out real-time analysis and extraction;
(3) intelligent controller regulates reactive-load compensator parameter according to detecting in real time energy value, realizes the dynamic reactive of distribution system or electrical load is compensated fast;
(4) adjustable condenser group and induction reactance converter cooperatively interact, and meet send to electrical network idle adjustable continuously.
In a word, composite electric load dynamic reactive fast-compensation method provided by the invention, has reduced power electric component voltage withstand class and requirement and environment for use.Realize reactive power in different load situation and real-time analysis and the extraction of reactive current.Finally, for the situation of load variations (sudden change of inductive load, the sudden change of capacitive load, inductive load suddenly change and sport inductive load to capacitive load and capacitive load), can seek optimum idle quick compensation Based Intelligent Control.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of composite electric load dynamic reactive fast-compensation method of the present invention.
In Fig. 1: 1. high voltage isolator; 2. primary cut-out; 3. voltage current transformer; 4. intelligent electric energy detection module; 5. adjustable condenser group; 6. induction reactance converter; 7. intelligent controller; 8. fast acting fuse; 9. capacitor switching contactor; 10. capacitor; 11. variable reactors; 12. electronic power converters.
Embodiment
Below in conjunction with implement and accompanying drawing the invention will be further described, but do not limit the present invention.
The dynamic reactive fast-compensation method of composite electric load provided by the invention, it controls electronic power converter 12 by intelligent controller 7, change electric current and the impedance of the secondary winding of variable reactor 11, thereby change electric current and the impedance of a winding of variable reactance converter.In the time that input voltage is constant, realize the change of variable reactor 11 admittance, just can change fundamental current, thereby cause the variation of variable reactor 11 absorbing reactive powers.Target power factor left and right is controlled and compensated to adjustable condenser group 5 by intelligent controller 7, and induction reactance converter 6 coordinates adjustable condenser group 6, and energy smooth adjustment reactive power, realizes dynamic passive compensation.
The dynamic reactive fast-compensation method of above-mentioned composite electric load provided by the invention, its concrete steps are as follows:
1) start operation: closing by hand QS(high voltage isolator 1), QF(primary cut-out 2), the intelligent electric energy detection module 4 in circuit and intelligent controller 7 access after power supply electricly, intelligent controller 7 is started working, system enters operation;
2) detected transmission: the current and voltage signals that voltage current transformer 3 extracts, through Intelligent Measurement module 4, is converted to digital signals such as required " power factor, active power, reactive power, voltage and currents ", sends into intelligent controller 7 by RS485 bus;
3) analytical calculation: the digital signal collecting by real-time analysis, calculate needed compensating power size, determine the capacity of input compensation capacitor;
4) send idle: according to the capacity of input compensation capacitor, intelligent controller 7 is by controlling the closure of KM11～contactor KM1n, and switching adjustable condenser 10 sends idlely to system, approach desired value to improve power factor.In the time that power factor meets the demands, return to step 2), otherwise proceed to step 5);
5) absorb idle: in the time of overcompensation, export control signal to controlling electronic power converter 12 by intelligent controller, regulate the induction reactance of induction reactance reactor 6, with absorbing reactive power, make power factor be maintained to desired value;
Having realized composite electric load dynamic reactive by above step 1) to step 5) compensates fast.
The dynamic reactive fast-compensation method of composite electric load provided by the invention, its application in the Quick reactive-load compensation of high pressure composite electric load that comprises metallurgy, building materials or petrochemical industry field.
The dynamic reactive fast-compensation method of above-mentioned composite electric load provided by the invention, can adopt the device shown in Fig. 1 to realize, the structure of this device is: be made up of intelligent electric energy detection module 4, intelligent controller 7, adjustable condenser group 5 and induction reactance converter 6, wherein: tunable capacitor group 5 is formed after parallel connection by the series circuit of organizing fast acting fuse 8, capacitor switching contactor 9 and capacitor 10 more, induction reactance converter 6 is made up of variable reactor 11 and electronic power converter 12.After adjustable condenser group 5 and induction reactance converter 6 is in parallel in access electrical network, intelligent controller 7 is connected with thyristor circuit in intelligent electric energy detection module 4 and induction reactance converter 6 respectively by data wire.
Described tunable capacitor group 5, the series circuit of itself and capacitor switching contactor 9, I/O interface circuit form and send idle loop to electric power system.
Described induction reactance converter 6 is connected to the grid after being connected with the end of incoming cables of the first side winding of variable reactor 11 by capacitor switching contactor 9, the leading-out terminal ground connection of first side winding; The secondary side winding of variable reactor 11 is connected with electronic power converter 12.
Described electronic power converter 12 is made up of three-phase anti-parallel thyristor, is connected on respectively the two ends of variable reactor secondary winding, and controls trigger board triggering and conducting by intelligent controller 7.
Described intelligent controller 7 adopts PLC control system.
Described PLC control system is by the PLC controller being connected with power supply and the electrical energy parameter acquisition module, touch-screen, I/O interface circuit, the trigger board the electric circuit constitute that are connected with PLC controller respectively with data wire.
The course of work of this device is as follows:
1. closing by hand QS(high voltage isolator 1), QF(primary cut-out 2), the intelligent electric energy detection module 4 in circuit and intelligent controller 7 access after power supply electricly, intelligent controller 7 is started working;
2. pass through intelligent controller 7 by contactor KM1 closure, now adjustable condenser group 5 accesses electrical network, the current/voltage that intelligence electric energy detection module 4 extracts by voltage current transformer 3 is through converting power factor and active power to, the adhesive of the KM11～KM1n of intelligent controller 7 control capacitance contactors 9 selects suitable several group capacitors 10 to drop into electrical network, the actual capacitance that regulates access electric power system, makes power factor of electric network reach target power factor.
3. according to predefined algorithm, by intelligent controller 7 output pulse signals, control the primary current that electronic power converter 12 regulates variable reactor 11, thereby make induction reactance converter 6 absorbing reactive powers adjustable, thereby play power factor of electric network fine setting and the real-time effect that detects and regulate the reactive power of sending;
4. by the variation of voltage current transformer 3 and intelligent electric energy detection module 4 real-time detection of grid power factors, make intelligent controller 7 by " start operation, detected transmission, analytical calculation, send idle and absorb idle " process by control algolithm, make Q
0, Q
cand Q
lalgebraical sum be close to 0.
5. after composite electric loaded work piece is in stable condition, the power factor of electrical network reaches target zone, and the composite electric load dynamic reactive quick compensator that the present invention adopts detects and steady-working state in real time, can send or absorb stable reactive power.Having realized composite electric load dynamic reactive by above step 1-4 compensates fast.
Claims (8)
1. the dynamic reactive fast-compensation method of composite electric load, it is characterized in that controlling electronic power converter (12) by intelligent controller (7), change electric current and the impedance of the secondary winding of variable reactor (11), thereby change electric current and the impedance of a winding of variable reactance converter; In the time that input voltage is constant, realize the change of variable reactor (11) admittance, just can change fundamental current, thereby cause the variation of variable reactor (11) absorbing reactive power; When target power factor is controlled and compensated to adjustable condenser group (5) by intelligent controller (7), induction reactance converter (6) coordinates adjustable condenser group (5), can smooth adjustment reactive power, realize the dynamic passive compensation of composite electric load.
2. the dynamic reactive fast-compensation method of composite electric load according to claim 1, is characterized in that steps of the method are:
1) start operation:
Give after the main circuit and control loop power supply in electric power system, arrange after corresponding operational factor, by start button, system enters operation; Described corresponding operational factor comprises power factor, active power, reactive power, voltage and current parameter;
2) detected transmission:
The voltage and current signal being extracted by voltage current transformer (3), through intelligent electric energy detection module (4) conversion, obtains the digital signal of required corresponding operational factor, then sends into intelligent controller (7) by RS485 bus;
3) analytical calculation:
The digital signal collecting by intelligent controller (7) real-time analysis, calculates needed compensating power size, determines the capacity of input compensation capacitor (10);
4) send idle:
According to the capacity of input compensation capacitor (10), intelligent controller (7) is by the closure of control contactor, and switching adjustable condenser group (5) is sent idlely to electric power system, approach desired value to improve power factor; In the time that power factor meets the demands, return to step 2), otherwise proceed to step 5);
5) absorb idle:
In the time of overcompensation, to electronic power converter (12), regulate the induction reactance of induction reactance converter (6) by intelligent controller (7) output control signal, with absorbing reactive power, make power factor maintain desired value.
Through above-mentioned steps, induction reactance converter (6) coordinates adjustable condenser group (5), can smooth adjustment reactive power, realize the dynamic passive compensation of composite electric load.
3. the dynamic reactive fast-compensation method of composite electric load according to claim 2, it is characterized in that described switching adjustable condenser group (5), send idle method to electric power system and be: intelligent controller (7) is determined will send idle Q to electric power system
0after, closed or the disconnection of this intelligent controller (7) control contactor KM11～contactor KM1n, drop into or excise the capacitor in the tunable capacitor group (5) being formed by the series circuit of organizing fast acting fuse (8), capacitor switching contactor (9) and capacitor (10) after parallel connection more, the actual capacitance that regulates access electric power system, sends idle Q to electric power system
c.
4. the dynamic reactive fast-compensation method of composite electric load according to claim 2, it is characterized in that the induction reactance of described adjusting induction reactance converter (6), method with absorbing reactive power is: induction reactance converter (6) is connected to the grid after being connected with the end of incoming cables of the first side winding of variable reactor (11) by contactor, the secondary side winding of variable reactor (11) is connected with electronic power converter (12), intelligent controller (7) calculates after will absorb idle, control electronic power converter (12), just can regulate the actual inductance value of access electric power system, absorb idle Q from electric power system
l.
5. the dynamic reactive fast-compensation method of composite electric load according to claim 2, is characterized in that described step 1) to the control method for coordinating between step 5) realized by PLC control system.
6. the dynamic reactive fast-compensation method of composite electric load according to claim 5, is characterized in that the realization of described PLC control system control method for coordinating is: the closure by the transmission of control signal and data-signal between data communication, touch-screen and PLC controller between the connected PLC controller of power supply and electrical energy parameter acquisition module, PLC controller by I/O interface circuit control contactor or disconnection, PLC controller are controlled trigger board by analog output module.
7. according to the dynamic reactive fast-compensation method of the composite electric load described in claim 3 or 4, it is characterized in that described Q
0, Q
cand Q
lalgebraical sum be close to 0.
8. the purposes of the dynamic reactive fast-compensation method of composite electric load described in arbitrary claim in claim 1 to 7, is characterized in that the application of the method in the Quick reactive-load compensation of high pressure composite electric load that comprises metallurgy, building materials or petrochemical industry field.
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065089A (en) * | 2014-06-30 | 2014-09-24 | 国网浙江省电力公司舟山供电公司 | Method for analyzing power cable compensation scheme using reactors in parallel |
| CN104184335A (en) * | 2014-09-11 | 2014-12-03 | 山东大学 | Multifunctional transformer with double transformer bodies connected in series |
| CN104678219A (en) * | 2015-02-10 | 2015-06-03 | 华南理工大学 | Capacitance compensation matching method based on high-current test system |
| CN104678218A (en) * | 2015-02-10 | 2015-06-03 | 华南理工大学 | Estimation method of optimal compensation capacitance of cable current rise test system |
| CN104716649A (en) * | 2015-04-07 | 2015-06-17 | 武汉理工大学 | Method for optimizing energy conservation of power distribution network |
| CN106026116A (en) * | 2016-05-18 | 2016-10-12 | 武汉理工大学 | Reactive compensation rapid smooth adjustment method |
| CN107482641A (en) * | 2017-03-10 | 2017-12-15 | 中国科学院广州能源研究所 | With the SVG control methods of intelligent capacitor group cooperating |
| CN109633323A (en) * | 2018-12-24 | 2019-04-16 | 杭州银湖电气设备有限公司 | A kind of REgulatable reactor load test system |
| CN110492495A (en) * | 2019-09-04 | 2019-11-22 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of movable type compact field high-pressure test device |
| CN110768267A (en) * | 2018-07-26 | 2020-02-07 | 株式会社日立制作所 | Factory power control system and control method thereof |
| CN111404172A (en) * | 2020-03-30 | 2020-07-10 | 杭州银湖电气设备有限公司 | Mixed type dynamic reactive power compensation system and method based on high-impedance transformer |
| CN111864735A (en) * | 2020-07-22 | 2020-10-30 | 安徽交通职业技术学院 | Switching compensation system |
| CN113410848A (en) * | 2021-05-24 | 2021-09-17 | 核工业理化工程研究院 | Touch reactive power compensation device |
| CN113972647A (en) * | 2021-10-22 | 2022-01-25 | 成都祥和云端节能设备集团有限公司 | Hall effect resonance bar electric energy transmission system |
| CN115800305A (en) * | 2023-02-02 | 2023-03-14 | 东方博沃（北京）科技有限公司 | Combined type high-voltage reactive power compensation method and system |
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| CN104678219A (en) * | 2015-02-10 | 2015-06-03 | 华南理工大学 | Capacitance compensation matching method based on high-current test system |
| CN104678218A (en) * | 2015-02-10 | 2015-06-03 | 华南理工大学 | Estimation method of optimal compensation capacitance of cable current rise test system |
| CN104678219B (en) * | 2015-02-10 | 2017-10-20 | 华南理工大学 | A kind of method that capacitance compensation based on cranking test system coordinates |
| CN104716649A (en) * | 2015-04-07 | 2015-06-17 | 武汉理工大学 | Method for optimizing energy conservation of power distribution network |
| CN106026116A (en) * | 2016-05-18 | 2016-10-12 | 武汉理工大学 | Reactive compensation rapid smooth adjustment method |
| CN107482641A (en) * | 2017-03-10 | 2017-12-15 | 中国科学院广州能源研究所 | With the SVG control methods of intelligent capacitor group cooperating |
| CN107482641B (en) * | 2017-03-10 | 2021-01-08 | 中国科学院广州能源研究所 | SVG control method working with intelligent capacitor bank |
| CN110768267A (en) * | 2018-07-26 | 2020-02-07 | 株式会社日立制作所 | Factory power control system and control method thereof |
| CN110768267B (en) * | 2018-07-26 | 2023-06-09 | 株式会社日立制作所 | Factory power control system and control method thereof |
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| CN109633323B (en) * | 2018-12-24 | 2021-03-26 | 杭州银湖电气设备有限公司 | Adjustable reactor load test system |
| CN110492495A (en) * | 2019-09-04 | 2019-11-22 | 国网电力科学研究院武汉南瑞有限责任公司 | A kind of movable type compact field high-pressure test device |
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| CN111864735A (en) * | 2020-07-22 | 2020-10-30 | 安徽交通职业技术学院 | Switching compensation system |
| CN113410848A (en) * | 2021-05-24 | 2021-09-17 | 核工业理化工程研究院 | Touch reactive power compensation device |
| CN113972647A (en) * | 2021-10-22 | 2022-01-25 | 成都祥和云端节能设备集团有限公司 | Hall effect resonance bar electric energy transmission system |
| CN115800305A (en) * | 2023-02-02 | 2023-03-14 | 东方博沃（北京）科技有限公司 | Combined type high-voltage reactive power compensation method and system |
| CN115800305B (en) * | 2023-02-02 | 2023-04-18 | 东方博沃（北京）科技有限公司 | Combined type high-voltage reactive power compensation method and system |
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Application publication date: 20140528 |