CN105703377A - Dynamic switching control circuit for medium-voltage power capacitor - Google Patents
Dynamic switching control circuit for medium-voltage power capacitor Download PDFInfo
- Publication number
- CN105703377A CN105703377A CN201610142930.XA CN201610142930A CN105703377A CN 105703377 A CN105703377 A CN 105703377A CN 201610142930 A CN201610142930 A CN 201610142930A CN 105703377 A CN105703377 A CN 105703377A
- Authority
- CN
- China
- Prior art keywords
- voltage
- capacitor
- controller
- catalyst
- power capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention discloses a dynamic switching control circuit for a medium-voltage power capacitor, which is in bridge connection onto a vacuum switch or a contactor between the power grid and a capacitor. The dynamic switching control circuit for a medium-voltage power capacitor comprises two voltage acquisition modules, a weak current switch and a controller, wherein one of the two voltage acquisition modules is used for acquiring power grid input voltage at one end of the contactor, and the other is used for acquiring output voltage at the other end of the contactor; the weak current switch is linked with the above vacuum switch or the contactor; and the controller is respectively connected with output ports of the two acquisition modules for receiving a switching on or switching off instruction of an upper computer and outputting a corresponding triggering instruction to the triggering end of the weak current switch. Defects that quick switching on response lags behind relatively can be overcome, and a circuit which can realize dynamic switching and has few elements is provided.
Description
Technical field
The present invention relates to more than 6KV power capacitor and synchronize switching technology, specifically a kind of circuit and control method thereof being applied in power capacitor to realize dynamic switching。
Background technology
Switching power capacitor bank custom circuit is: mechanical contact switching, thuristor throw-in and throw-off (TSC), synchronous vacuum switch。Capacitor has state three kinds possible altogether, the first is energising first (capacitor is not electrically charged or electric discharge completely already), the second is switched in operation (change Tong Bu with line voltage of the voltage on capacitor), the third is that (capacitor is in discharge condition in firm power-off, if grid voltage waveform is in negative half period before power-off, capacitor is in negative sense discharge condition；Positive half cycle is also in like manner)；
Mechanical contact fling-cut switch, threephase switch is at random uncertain line voltage point switched capacitor, and rush of current is likely to reach the rated current of several times, causes line voltage to distort。There is also the spring of combined floodgate mechanical contact, open the dangerous probability restriked in contact, spring is restriked so that Capacitor banks overvoltage, damages capacitor, it is easy to cause the accident。
Thyristor switchable capacitor (TSC) circuit can accurately put into capacitor, it does not have rush of current。The problem be absent from spring, restriking。But, high pressure TSC circuit IGCT to bear the electrical network virtual value voltage of about 3 times, pressure only several KV of IGCT, need many Thyristors in series, there is the tube voltage drop of about 2V in turn on thyristors, the electric current of hundreds of ampere flows through IGCT, and loss heating is big, producing the heat of number KW during a set of TSC circuit turn-on, power consumption is big。So big heat needs to be dispelled the heat by air-cooled, water-cooled, heat pipe etc.。TSC technical difficulty is big, and cost is high。
In present engineering, the phased switch of application is also referred to as synchronous vacuum switch or synchro switch, such as patent document " synchro switch ", the patent No.: ZL98808789.8, patent document " phase control switch device ", the patent No.: ZL99118416.5, patent document: " phase controlling switch device ", application number: 00137229.7 tells about, and also has 3 deficiencies: synchro switch element is many, be only the reduction of Guan Bi dash current, movement time is with standard machinery formula contact fling-cut switch identical too slow。The phased switch of described opening-closing capacitor bank or be called that synchronous vacuum switch all has three switches, switch element is many。
Summary of the invention
The technical problem to be solved is to provide and a kind of overcomes the third state quickly to put into the defect that relatively lags behind of response, it is provided that a kind of can realize dynamic switching and the less synchronous dynamic switching circuit of element suitable in power capacitor。
In order to solve above-mentioned technical problem, the present invention provides following technical scheme:
The dynamic switching control circuit of power capacitor, is connected across the vacuum switch between electrical network and capacitor or on catalyst, including:
Two voltage acquisition modules, one of them is for gathering the electrical network input voltage of catalyst one end, and another is for gathering the output voltage of the catalyst other end；
Light current switchs, and links with above-mentioned vacuum switch or catalyst,
Controller, is connected with the output port of two acquisition modules respectively, for receiving input or the excision instruction of host computer, and exports corresponding triggering command to light current switch triggering end。
Further, described light current switchs with in the operation coil together Access Control loop of vacuum switch or catalyst；
The operation coil (also referred to as solenoid) of vacuum switch or catalyst, light current switch is linked as a loop (access power end) controlling vacuum switch or catalyst break-make with corresponding operation coil, triggered light current switch (break-make can be triggered by low level signal) break-make by controller and just can control whether operation coil is energized, and then control the break-make of vacuum switch or catalyst。
Further, for ensureing the safety of controller, between described acquisition module and controller, voltage reduction module is had additional。
For the effect of the present invention is explained further, now makes following principle and illustrate:
A. controller detects change in voltage respectively by two detection acquisition modules, follow the tracks of respectively and electrical network input voltage is labeled as power capacitor voltage waveform, output voltage is labeled as capacitor voltage waveform, and calculates function (U-t) expression formula of two waveforms respectively；
B. controller waits input or the excision instruction of host computer；
C. after controller receives input or excision instruction, through t2 certain time delay, signal is triggered accordingly to sending of light current switch, described light current switch and above-mentioned vacuum switch or catalyst linkage；Wherein the calculating formula of t2 is
T1-t3 (when condenser voltage perseverance is zero)；
T2=t4-t3(is when condenser voltage is cosine or sinusoidal wave form)；
T5-t3(is when condenser voltage exponentially waveform)。
Wherein t1 represents the time required when putting into instruction to power capacitor voltage waveform zero crossing that received by controller；
T3 represents that being received the tactile electromechanics that sends signals to by light current switch completes excision with closing linkage or put into the time required for operating；
T4 represents the time required when being received excision instruction to power capacitor voltage waveform arrival crest or trough by controller；
T5 represent received by controller put into instruction to condenser voltage and power capacitor voltage cross with half cycle discharge waveform time required time；
Solving of above-mentioned calculating formula, premised on t2 >=0, tries to achieve the minima of t2 or the arbitrarily selected value in (0,2min) interval；
D. step b is returned to。
Having two kinds with the situation of half cycle, one is condenser voltage is negative voltage, then refer to the negative half period of power capacitor voltage with half cycle；Another kind of condenser voltage is forward voltage, then refer to the positive half cycle of power capacitor voltage with half cycle；The discharge waveform of the positive half cycle of power capacitor voltage refers to the interval waveform of these π/4 when voltage is returned to null value by crest；The discharge waveform of the positive half cycle of power capacitor voltage refers to the interval waveform of these π/4 when voltage is returned to null value by trough。So limit, condenser voltage electric discharge when being because putting into, if now power capacitor voltage is (can be left out the situation of reverse half cycle completely at same half cycle herein, because forward electric discharge or negative sense electric discharge during condenser voltage electric discharge, can not cross with the power capacitor voltage of reverse half cycle) in interval by zero valued transition to trough or crest, capacitor can be charged by power capacitor voltage；Although it is equal to put into moment both voltage, but can because of simultaneous directional current, and produce to shove greatly；Otherwise, when power capacitor voltage is returned to null value by peak value, to discharging capacitors, will not there is above-mentioned phenomenon in power capacitor voltage。
Compared with prior art the technical program has the advantages that
1, condenser voltage perseverance is zero, and what now controller received can only be put into instruction, and this belongs to prior art, does not repeat herein；
2, condenser voltage is cosine waveform or sinusoidal wave form, and namely condenser voltage follows the change of power capacitor voltage synchronous, and capacitor is in access "on" position, and the switch command that now controller receives can only be excision instruction。In order to ensure excise time do not produce electric arc, should between power capacitor and capacitor for zero current time excise。Characteristic according to capacitor, when capacitor is zero current, condenser voltage is just the state of crest or trough。Also it is based on this thinking, the switching circuit of the present invention is not provided with current sample module, directly can draw corresponding current information by the conversion of controller, so can save cost further, save space。
3, condenser voltage exponentially waveform, namely capacitor is in discharge condition, the power supply to capacitor of the power capacitor Circuit Interrupt, and switch command that now controller receives can only be put into instruction。
In order to not produce to shove when making input, and be not to wait for capacitor and discharge completely, the present invention individually gathers condenser voltage and power capacitor voltage waveform；Before putting into, both are independent of each other by voltage, and when condenser voltage and power capacitor voltage waveform cross, namely electromotive force puts into time equal, it is ensured that being carried in the voltage on vacuum switch or catalyst during input is zero, completes to put into operation。Although capacitor discharge needs completely > 2min, but in a power capacitor voltage cycle (20ms), inherently the requirement of a time point satisfied " condenser voltage and power capacitor voltage cross with half cycle discharge waveform ", then just achieves quickly dynamically putting into of ms level。(0, 2min) the arbitrarily selected value in interval, refer to due to particular/special requirement, it is not necessarily intended to minima (not necessarily condenser voltage and power capacitor voltage first joint with half cycle discharge waveform trying to achieve t2, it can also be second or the 3rd), can according to concrete switching instruction or preset other requirements by programming mode, thus reaching more preferably to solve, but no matter it is how the specific requirement of sample, as long as according to this programme (0, 2min) solve, all can improve to some extent than prior art, switching under the third state is overcome to respond the defect relatively lagged behind。
Put into or excision electrical network owing to the present invention is applied to power capacitor synchronous dynamic, controller is difficult to the vacuum switch or the catalyst that directly control in major loop, realizes the control to vacuum switch or catalyst by the light current switch triggered with vacuum switch or catalyst linkage。Light current switch refer in particular to pressed by light current or weak current trigger switch。
Accompanying drawing explanation
Fig. 1 is the signal flow graph of the dynamic switching control circuit of embodiment of the present invention medium voltage electricity capacitor。
Detailed description of the invention
Below in conjunction with drawings and Examples, technical solution of the present invention is further illustrated:
The dynamic switching control circuit of power capacitor, is connected across the vacuum switch between electrical network and capacitor or on catalyst,
Including with the relay (only may also be with the active type relay of coil tandem) on vacuum switch or contactor coil together Access Control loop, also include two voltage transformers for following the tracks of each voltage waveform change of relay two ends respectively。It is known to the skilled person, the voltage transformer of detection grid voltage waveform should be connected between vacuum switch or catalyst fracture upper end and line voltage bus, and voltage transformer should be connected between vacuum switch or catalyst fracture lower end and capacitor by sensing capacitor voltage waveform；Between equally applicable similar output or application circuit。It is located at the controller between two voltage transformers (voltage reduction module can also be set between described sampling module and controller)。
Controller (MCU) is for accepting input or the excision instruction of host computer, and controller (MCU) is also connected with the triggering end of light current switch。
Described voltage reduction module can be the peripheral module of controller (MCU)；Its Main Function is overvoltage protection (and not changing voltage-phase); controller (MCU) is obtained and the analogue signal of line voltage, the change of condenser voltage Phase synchronization by voltage transformer; then controller just can draw the actual oscillogram of line voltage, condenser voltage (analogue signal and the electrical network of reality, capacitor voltage waveform phase place owing to obtaining are identical, are only that after blood pressure lowering, amplitude there occurs change；Controller according to sample circuit (as shown in Figure 1) blood pressure lowering data set in advance, can reduce actual waveform and function)。
Power capacitor synchronous dynamic switching control method, comprises the steps,
A. controller (MCU) detects vacuum switch or catalyst two ends each change in voltage by voltage transformer, follows the tracks of and is labeled as grid voltage waveform and capacitor voltage waveform respectively, and calculate function (U-t) expression formula of two waveforms respectively；
B. controller (MCU) waits input or the excision instruction of host computer；
C. after controller (MCU) receives input or excision instruction, through t2 certain time delay, signal is triggered accordingly to sending of light current switch, described light current switch and the linkage of above-mentioned catalyst；Wherein the calculating formula of t2 is
T1-t3 (when condenser voltage perseverance is zero)；
T2=t4-t3(is when condenser voltage is cosine or sinusoidal wave form)；
T5-t3(is when condenser voltage exponentially waveform)。
Wherein t1 represents the time required when putting into instruction to grid voltage waveform zero crossing that received by controller (MCU)；
T3 represents that being received the tactile electromechanics that sends signals to by light current switch completes excision with closing linkage or put into the time required for operating；
T4 represents the time required when being received excision instruction to grid voltage waveform arrival crest or trough by controller (MCU)；
T5 represent received by controller (MCU) put into instruction to condenser voltage and line voltage cross with half cycle discharge waveform time required time；
Solving of above-mentioned calculating formula, premised on t2 >=0, tries to achieve the minima (when namely requiring condenser voltage and line voltage with first joint of half cycle discharge waveform, catalyst completes to put into, naturally it is also possible to looks concrete condition and specifies second or the 3rd) of t2；
D. step b is returned to。
For the judgement of capacitor voltage waveform in the solution formula of t2, it is only limitted to controller (MCU) and receives the current state of condenser voltage when input or excision instruction；Skilled person will appreciate that, in whole service process, capacitor voltage waveform, can not by a function expressed intact more like a piecewise function, and controller is only capable of analyzing respective function according to capacitor voltage waveform situation under current state and selecting the concrete formula of t2。
Additionally controller (MCU) receives instruction and can not be clear and definite and concrete input instruction or excision instruction, it can be a switching signal, being understood that by MCU instruction is still excised in input instruction voluntarily, this point also relates to the judgement to capacitor voltage waveform current state。If when condenser voltage perseverance is zero, namely current state is that catalyst disconnects, and completely, switching signal now, by logic presumption, necessarily puts into instruction in condenser voltage electric discharge。When condenser voltage is cosine or sinusoidal wave form, condenser voltage follows line voltage conversion, and catalyst must be Guan Bi, and switching signal now, by logic presumption, necessarily excises instruction；When condenser voltage exponentially waveform, namely current state is that catalyst disconnects, and condenser voltage is not fully discharged, and switching signal now, by logic presumption, necessarily puts into instruction。The present invention only discusses the input situation after catalyst disconnects, the excision situation after Guan Bi；After disconnecting for catalyst, controller receives the failure situations of false command (such as excision instruction), not discusses。
In Fig. 1, vacuum switch adopts gloomy source, Xi'an VS1-12KV-630A, 25KA；DC220V permanent magnet mechanism；Or vacuum contactor adopts Tianjin prestige section CKG4-12KV-630A；DC220V permanent magnet mechanism。
Voltage transformer adopts treasure ZYVT-10KV(electronic type in Guangdong)。
Relay adopts sea salt magnetic latching relay HZX-301FA；
The power module of each element adopts wound four directions, Beijing T3L-04；
Can setting up switching signal receiving module (Sharp PC817) and receive instruction for controller (MCU), controller adopts STC12C5616AD module。
Claims (3)
1. the dynamic switching control circuit of power capacitor, is connected across the vacuum switch between electrical network and capacitor or on catalyst, it is characterised in that including:
Two voltage acquisition modules, one of them is for gathering the electrical network input voltage of catalyst one end, and another is for gathering the output voltage of the catalyst other end；
Light current switchs, and links with above-mentioned vacuum switch or catalyst,
Controller, is connected with the output port of two acquisition modules respectively, for receiving input or the excision instruction of host computer, and exports corresponding triggering command to light current switch triggering end。
2. the dynamic switching control circuit of power capacitor as claimed in claim 1, it is characterised in that described light current switchs with in the operation coil together Access Control loop of vacuum switch or catalyst。
3. the dynamic switching control circuit of power capacitor as claimed in claim 1, it is characterised in that have additional voltage reduction module between described acquisition module and controller。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610142930.XA CN105703377A (en) | 2016-03-14 | 2016-03-14 | Dynamic switching control circuit for medium-voltage power capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610142930.XA CN105703377A (en) | 2016-03-14 | 2016-03-14 | Dynamic switching control circuit for medium-voltage power capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105703377A true CN105703377A (en) | 2016-06-22 |
Family
ID=56221591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610142930.XA Pending CN105703377A (en) | 2016-03-14 | 2016-03-14 | Dynamic switching control circuit for medium-voltage power capacitor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105703377A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571237A (en) * | 2004-04-29 | 2005-01-26 | 江苏省电力公司泰州供电公司 | Dynamic control method for capacitor switching in low-voltage reactive compensation |
| US20080203979A1 (en) * | 2005-09-26 | 2008-08-28 | Ruitian Su | Customer Intelligent Reactive Power Automatic Compensation Energy-Saved Device |
| CN201946985U (en) * | 2010-12-31 | 2011-08-24 | 佛山市顺德电力设计院有限公司 | 10 kV power system intelligence dynamic reactive power compensation switch device |
| CN102904264A (en) * | 2012-09-29 | 2013-01-30 | 浙江紫光电器有限公司 | High-voltage reactive power automatic compensation device |
| CN105305458A (en) * | 2015-10-09 | 2016-02-03 | 国电南瑞科技股份有限公司 | Synchronization switch zero-crossing switching self-correction system and method |
-
2016
- 2016-03-14 CN CN201610142930.XA patent/CN105703377A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1571237A (en) * | 2004-04-29 | 2005-01-26 | 江苏省电力公司泰州供电公司 | Dynamic control method for capacitor switching in low-voltage reactive compensation |
| US20080203979A1 (en) * | 2005-09-26 | 2008-08-28 | Ruitian Su | Customer Intelligent Reactive Power Automatic Compensation Energy-Saved Device |
| CN201946985U (en) * | 2010-12-31 | 2011-08-24 | 佛山市顺德电力设计院有限公司 | 10 kV power system intelligence dynamic reactive power compensation switch device |
| CN102904264A (en) * | 2012-09-29 | 2013-01-30 | 浙江紫光电器有限公司 | High-voltage reactive power automatic compensation device |
| CN105305458A (en) * | 2015-10-09 | 2016-02-03 | 国电南瑞科技股份有限公司 | Synchronization switch zero-crossing switching self-correction system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105207232A (en) | Intelligent phase selection control system for 12 kV permanent magnet vacuum circuit breaker | |
| CN104113057B (en) | A kind of combined DC switchgear and control method thereof | |
| CN106057566B (en) | A kind of combination switch and its working method for high-voltage capacitance switching | |
| CN104578117B (en) | A kind of intelligent phase-selection switch and its control circuit based on power line carrier, PLC | |
| CN2800620Y (en) | Intelligent zero-cross opening or closing gate breaker | |
| CN110718418B (en) | Switch parallel capacity expansion operation control method based on single-pole contactor | |
| CN104979837A (en) | Two-control-over-three simplified pre-charge synchronous switch circuit of switched capacitor | |
| CN104578093B (en) | Phase-controlled switch peak zero-cross-switching inrush current control circuit and control method | |
| CN105703377A (en) | Dynamic switching control circuit for medium-voltage power capacitor | |
| CN106451500B (en) | Interphase load transfer terminal device based on transient waveform fitting | |
| CN101510689B (en) | Synchronous switch | |
| CN204304445U (en) | A kind of phased switch peak value operating passing zero Inrush control circuit | |
| CN110416009A (en) | Relay switching circuit and controller without the electric arc long-life | |
| CN202474877U (en) | Single triple-pole synchronous switch-based intelligent reactive power compensation device | |
| CN207381982U (en) | It is a kind of to realize the threephase load switching device with alternate blocking function with two switches | |
| CN202443886U (en) | Synchronous switch | |
| CN203674723U (en) | High-voltage wattless power intelligent compensation device | |
| CN202353224U (en) | Low-voltage phased switching capacitor switch | |
| CN102593847A (en) | Single tripolar synchronous switch-based intelligent reactive power compensation device | |
| CN205123697U (en) | Synchronous power transfer switch | |
| CN105680673A (en) | Control method achieved based on microcontroller for three-phase AC solid-state switch | |
| CN204408308U (en) | A kind of one-out-three load switch module | |
| CN214898165U (en) | Inrush current suppression fling-cut switch capable of being switched on and switched off in zero-voltage closing mode | |
| CN214479584U (en) | Manual zero-crossing driving type switch and device | |
| CN105656058A (en) | Dynamic switching circuit of electromechanical synchronous switch of capacitor and control method of dynamic switching circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160622 |
|
| RJ01 | Rejection of invention patent application after publication |