CN109687476A - Electricity opens standby change dynamic reactive compensation device and its control method - Google Patents
Electricity opens standby change dynamic reactive compensation device and its control method Download PDFInfo
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- CN109687476A CN109687476A CN201811601558.XA CN201811601558A CN109687476A CN 109687476 A CN109687476 A CN 109687476A CN 201811601558 A CN201811601558 A CN 201811601558A CN 109687476 A CN109687476 A CN 109687476A
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- idle
- high pressure
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- power
- voltage
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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
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
- H02J3/22—Arrangements for adjusting, eliminating or compensating reactive power in networks in cables
-
- 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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- Power Engineering (AREA)
- Control Of Electrical Variables (AREA)
Abstract
The invention discloses electricity to open standby change dynamic reactive compensation device and its control method, is related to transformer high-voltage Technology of Dynamic Reactive Power Compensation field.The present invention includes control unit, high pressure dynamic chain type is idle generating unit and the controllable parallel reactance unit of high pressure connected to it；High pressure dynamic chain type is idle, and generating unit includes starting module, power output module, the anti-module of power output string, and wherein control unit includes idle and opens into detection circuit, man-machine interface circuit, core processor, ON-OFF control circuit and its peripheral circuit；The controllable parallel reactance unit of high pressure includes high-pressure vacuum contactor, high-voltage shunt reactor.The present invention passes through the electrical parameter on detection inlet wire and bus, it can be carried out dynamic reactive compensation in generator or while opening standby variable speed auxiliary bus bar, especially when opening standby variable speed auxiliary bus bar, the variation that situation can be carried to avoid charge power and bus belt is uncertain to reactive compensation bring, so that real-time tracking carries out dynamic compensation.
Description
Technical field
The invention belongs to transformer high-voltage Technology of Dynamic Reactive Power Compensation fields, open more particularly to a kind of Auxiliary System in Power Plant
Standby become uses dynamic reactive compensation device and its Dynamic Compensation Control Method.
Background technique
In order to improve the power factor of electric system, line loss is reduced, more and more reactive power compensators are applied
Into electric system.Generation current factory is when generator works, station service opens standby change in hot stand-by duty, net side electricity over long distances
The charge power of cable makes supply side power factor be negative always, there is the more phenomenon of fine, and most of enterprise is to reduce or avoid
Fine uses reactive power compensator, and opening standby field of cashing using the station service of reactive compensation is all with parallel reactance, takes fixation
Formula compensation way cannot really realize that dynamic realtime compensates, be unable to satisfy actual demand, the reasons are as follows: open at standby change
In hot stand-by duty, the parameters such as each system cable length are different, and compensation inductive reactive power is in different size；The environment factors such as temperature
Variation, the demand of inductive reactive power are also variation；Standby become is opened to switch to band from stand-by heat zero load and carry and when rate of load condensate is relatively high, it is idle
Demand may become capacitive demand from perceptual demand, and fixed compensation is not able to satisfy completely；Open it is standby become do not work, generator band station-service
When bus, compensation device originally is even more to be unable to satisfy compensation to require.
Summary of the invention
The purpose of the present invention is to provide electricity to open standby change dynamic reactive compensation device and its control method, passes through, and solves
Existing problem.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions:
The present invention is that electricity opens standby change dynamic reactive compensation device, including electricity opens standby change dynamic reactive compensation device, packet
It includes
Control unit, described control unit is by idle and open into detection circuit, HMI interface, core processor, switch control
Circuit, power P WM control circuit and its peripheral circuit composition；It is described idle and open into detection circuit by one group of mutual induction of voltage
Device, multiple groups current transformer, multiple filter circuits and A/D converter composition, wherein voltage transformer is connected across low pressure main bus-bar
Between ground wire, each group current transformer is socketed on the end of incoming cables of each low-voltage bus bar, voltage transformer and each Current Mutual Inductance respectively
Device is connected to the input end of analog signal of corresponding A/D converter, the number of each A/D converter through respective filter circuit respectively
Signal output end is connect with the I/O of DSP mouth respectively；The power P WM control circuit triggers electricity with optical fiber by pwm pulse distribution
Road composition；
High pressure dynamic chain type is idle generating unit, the idle generating unit of high pressure dynamic chain type includes multiple power moulds
Block, starting module, series reactance module, wherein multiple power modules are to be composed in series, and pass through series reactance module then
Activated module jumps on high voltage bus, and each power module is connected by optical fiber with control unit；The starting module by
High voltage connector and start-up resistor form；
The controllable switching parallel reactance unit of the high pressure connecting with the idle generating unit of high pressure dynamic chain type, the high pressure can
Controlling switching parallel reactance unit includes high-pressure vacuum contactor, high-voltage shunt reactor, and wherein high-voltage shunt reactor passes through height
Pressure vacuum contactor jumps on high voltage bus.
Further, the HMI interface is made of touch screen and RS485 connection, the HMI interface and core processing
Device is connected by RS485 connection.
Further, the core processor is made of DSP28335 and its peripheral circuit, and core processor is according to sampling
Data analyzed, handled, judged, stored, and generate control command carry out dynamic passive compensation control.
Further, the ON-OFF control circuit is made of the I/O mouth of DSP with optocoupler.
Further, the power module is made of IGBT and its trigger protection circuit.
Electricity opens the control method of standby change dynamic passive compensation, comprising the following steps:
Step 1: detecting the electric current of inlet wire and the voltage of the position of the switch, bus by control unit；
Step 2: order real-time output reactive power of the idle generating unit of high pressure dynamic chain type according to control unit；
Step 3: control unit passes through sampling generator inlet wire current and busbar voltage when generator inlet wire works normally,
It calculates in real time idle, and the idle generating unit of high pressure dynamic chain type is controlled according to idle situation and carries out tracing compensation；
Step 4: maintenance for generation companies or other abnormal conditions, when spare inlet wire comes into operation, control unit is automatically controlled
Put into the controllable switching parallel reactance unit of high pressure.
Further, in the step 4, control unit automatically control method the following steps are included:
For A when on bus being zero load, the controllable parallel reactance unit of high pressure carries out overfill to cable and other charge powers
It repays, makes the reactive power perception of spare inlet wire, control unit detects the idle situation of inlet wire, and control high pressure dynamic chain type is idle
Generating unit real-time compensation part capacitive reactive power, makes system inlet wire power factor close to 1；
For B when band carries on bus, control unit detects the idle situation of inlet wire, according to real-time idle size and it is positive and negative come
The output for controlling the idle generating unit of high pressure dynamic chain type, makes system inlet wire power factor close to 1.
The invention has the following advantages:
The dynamic reactive compensation device of the invention combines its Dynamic Compensation Control Method, can pass through detection inlet wire and bus
On electrical parameter, can be carried out dynamic reactive compensation in generator or while opening standby variable speed auxiliary bus bar, especially open it is standby
When variable speed auxiliary bus bar, the variation that situation can be carried to avoid charge power and bus belt is uncertain to reactive compensation bring,
To which real-time tracking carries out dynamic compensation.
Certainly, it implements any of the products of the present invention and does not necessarily require achieving all the advantages described above at the same time.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, will be described below to embodiment required
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the structural schematic diagram that electricity opens standby change dynamic reactive compensation device；
Fig. 2 is the schematic illustration of the idle generating unit of Fig. 1 mesohigh dynamic chain type；
Fig. 3 is the circuit structure schematic diagram of control unit；
Fig. 4 is the schematic diagram for the Dynamic Compensation Control Method that electricity opens standby change dynamic reactive compensation device；
Fig. 5 is the software flow pattern of Dynamic Compensation Control Method.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts all other
Embodiment shall fall within the protection scope of the present invention.
The present invention is that electricity opens standby change dynamic reactive compensation device and its control method.
The device includes that control unit 1, high pressure dynamic chain type is idle generating unit 2 and the high pressure of connection connected in parallel are controllable
Switching parallel reactance unit 3.
As shown in Figure 1, generator inlet wire 7 is connected to bus 4 by high-voltage switch gear 5, opens standby low pressure side outlet 8 and pass through height
It compresses switch and 6 is connected to bus 4.
The switching value input circuit 14 of the auxiliary normal opened contact access control unit 1 of high-voltage switch gear 5,6；4 voltage PT of bus
Secondary side, the electric current CT secondary side of inlet wire 7, inlet wire 8 electric current CT secondary side be respectively connected to control unit 1 analog quantity sampling and
Processing circuit 17.
High-voltage parallel reactance 31 is jumped on bus 4 by high-pressure vacuum contactor 32.The control of high-pressure vacuum contactor 32
Coil processed is connected to the switching value output circuit 13 of control unit 1, and auxiliary normal opened contact is connected to the switching value of control unit 1
Input circuit 14.Wherein, the capacity requirement of high-voltage parallel reactance 31 takes 1.1 times of maximum line charging reactive power, to protect
Card injected system inductive reactive power electric current makes entire inlet wire current become larger, convenient for the sampling of control unit 1.
As shown in Fig. 2, power module 26 series connection series connection current-limiting reactor 25, charging resistor 24, high-pressure vacuum contactor 21
And disconnecting switch 28 finally jumps on bus 4；Power module 26 is connected to the optical fiber interface 16 of control unit 1 by optical fiber；It keeps away
Thunder device 23 connects in 21 and 28 connecting nodes；Section is connected between 22 1 end Jie 21 and 28 of another high-pressure vacuum contactor
Point, in the connecting node between an end Jie 24 and 25；The output electricity of the 27 idle generating units of real-time monitoring high pressure dynamic chain type
Stream, it is secondary to flank into analog quantity sampling and processing circuit 17；21/22 control coil is connected on switching value output circuit 13,
It assists normal opened contact to be connected to the amount of opening the light input circuit 14.
As shown in figure 3, described control unit include voltage and current sampling and processing circuit 17, switching value input circuit 14,
HMI interface 12, core processor 11, switching value output circuit 13, power P WM pulse distribution control circuit 15 and its optical fiber interface
16 compositions；The A/D module of voltage and current sampling and the access of processing circuit 17 11, switching value input circuit 14 and output switch parameter electricity
The I/O mouth of the access of road 13 11,485 communication interfaces of the access of HMI interface 12 11.
In conjunction with the principle and structure of above-mentioned apparatus, such as Fig. 4 Dynamic Compensation Control Method the following steps are included:
In Fig. 4, number represents each main modular in Fig. 1 on ordinate, and curve represents the state that each module changes over time.
5 indicate generator incoming switch state, and high level then indicates that switch is in coincidence in figure, otherwise is in quartile.
6 indicate to open standby change incoming switch state, and high level then indicates that switch is in coincidence in figure, otherwise is in quartile.
9 indicate all curent changes being supported on inlet wire current mutual inductor on bus, and curve indicates the big of load in figure
Small variation bring reactive power size variation.
2 indicate the idle generating unit state of high pressure dynamic chain type, and curve reflects the variation of unit output reactive power size.
3 indicate the controllable switching parallel reactance location mode of high pressure, and high level indicates parallel reactance unit investment, low level table
Show that parallel reactance unit is not put into.
T0 indicates start time, and t1 indicates that 6 change to the coincidence moment from quartile, when t2 expression 5 changes to quartile from coincidence
It carves, t3 indicates that load changes the moment from zero load to rated power.
The voltage of the electric current of 1 real-time sampling inlet wire 7,8 of control unit and bus 4, the auxiliary contact respectively switched.Load current
The demand of 9 curve reflection actual loading reactive power, and got by the CT calculating of provided electric power incoming line.
When switch 5 is in coincidence, switch 6 is in quartile, i.e., when only inlet wire 7 is powered to bus 4, t0~t2 as shown in Figure 4
Period.It, can when control unit judges that 5 auxiliary node of switch is in closing position and 6 auxiliary node of switch is in open position
According to the real-time change of actual load current 9, system reactive power power demand is calculated, is needed by 2 output systems
Reactive power guarantees the power factor of inlet wire 7 close to target power factor, and 2 real-time tracking 9 of t0~t2 period is real-time in figure
Variation output is idle；
When switch 5 is in quartile, switch 6 is in coincidence, i.e., when inlet wire 8 is powered to bus 4, the t1 moment as shown in Figure 4 it
Afterwards.When control unit judgement 6 auxiliary node of switch is in closing position and 5 auxiliary node of switch is waited to become open position, i.e.,
After the t2 moment as shown in Figure 4, control unit 1 puts into the controllable switching unit 3 of high-voltage parallel, this injection method high-voltage parallel immediately
The inductive reactive power electric current that reactance 31 exports on the one hand offset open it is standby get higher the charging capacitive reactive power of voltage cable and make system into
8 reactive power of line is perception, so that enter line side electric current is become larger, is sampled convenient for control unit, guarantees control unit
The accuracy that reactive power demand calculates, then by 2 outputs, guarantee the power factor of inlet wire 8 close to target power factor.
Real-time detection CT electric current in software, the position of real-time judge 5,6 determine the use of injection method according to its position, then
Reactive demand is calculated, compensated setpoint electric current is exported by each module of optical fiber control 2, as shown in software flow Fig. 5,
It calculates by entrance, sampling into circulation and starts,
The position of real-time judge 5,6；
Do you if it is coincidence, then judge that 6 are in coincidence? it is then to enter the position of real-time judge 5,6, otherwise enters excision
3,5 side CT reactive demands are calculated, according to capacity compensated setpoint electric current, are exported by constant current control 2；
Quartile is in if it is quartile, 6? it is that please then give current cut-off 3；It is then to put into 3, calculates the 6 idle need of side CT
Amount is exported according to capacity compensated setpoint electric current by constant current control 2.
The device and its Dynamic Compensation Control Method are applied to Auxiliary System in Power Plant and open in standby change system.Apparatus structure letter
It is single, both dynamic passive compensation can be carried out to system busbar in generator powered, more standby can become electric power thus supplied open
Under dynamic passive compensation is carried out to system busbar, while solving unloaded or at light load, the power that opens the standby electric power thus supplied Down Highway that becomes
Factor or reactive power are that the lagging reactive power of negative value compensates, and solves the smaller sampling of electric current using injection method and be not allowed
The case where.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.There is no detailed for preferred embodiment
All details are described, are not limited the invention to the specific embodiments described.Obviously, according to the content of this specification,
It can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is in order to better explain the present invention
Principle and practical application, so that skilled artisan be enable to better understand and utilize the present invention.The present invention is only
It is limited by claims and its full scope and equivalent.
Claims (7)
1. electricity opens standby change dynamic reactive compensation device, it is characterised in that: including
Control unit, described control unit by it is idle and open into detection circuit, HMI interface, core processor, switch control electricity
Road, power P WM control circuit and its peripheral circuit composition；
It is described idle and open into detection circuit by one group of voltage transformer, multiple groups current transformer, multiple filter circuits and A/D
Converter composition, wherein voltage transformer is connected across between low pressure main bus-bar and ground wire, and each group current transformer is socketed on respectively
The end of incoming cables of each low-voltage bus bar, voltage transformer and each current transformer are connected to corresponding A/ through respective filter circuit respectively
The input end of analog signal of D converter, the digital signal output end of each A/D converter are connect with the I/O of DSP mouth respectively；
The power P WM control circuit is distributed by pwm pulse and is formed with optical fiber trigger circuit；
High pressure dynamic chain type is idle generating unit, the idle generating unit of high pressure dynamic chain type include multiple power modules,
Starting module, series reactance module, wherein multiple power modules are to be composed in series, and then passed through by series reactance module
Starting module jumps on high voltage bus, and each power module is connected by optical fiber with control unit；
The starting module is made of high voltage connector and start-up resistor；
The controllable switching parallel reactance unit of the high pressure connecting with the idle generating unit of high pressure dynamic chain type, the high pressure are controllably thrown
Cutting parallel reactance unit includes high-pressure vacuum contactor, high-voltage shunt reactor, and wherein high-voltage shunt reactor is true by high pressure
Empty contactor jumps on high voltage bus.
2. electricity according to claim 1 opens standby change dynamic reactive compensation device, which is characterized in that the HMI interface by
Touch screen and RS485 connection composition, the HMI interface are connect with core processor by RS485 connection.
3. electricity according to claim 1 opens standby change dynamic reactive compensation device, which is characterized in that the core processing
Device is made of DSP28335 and its peripheral circuit, and core processor is analyzed according to the data of sampling, handled, judged, stored,
And it generates control command and carries out dynamic passive compensation control.
4. electricity according to claim 1 opens standby change dynamic reactive compensation device and its control method, which is characterized in that institute
The ON-OFF control circuit stated is made of the I/O mouth of DSP with optocoupler.
5. electricity according to claim 1 opens standby change dynamic reactive compensation device, which is characterized in that the power module
It is made of IGBT and its trigger protection circuit.
6. the control method that the electricity as described in claim 1-5 is any one opens standby change dynamic passive compensation, which is characterized in that packet
Include following steps:
Step 1: detecting the electric current of inlet wire and the voltage of the position of the switch, bus by control unit；
Step 2: order real-time output reactive power of the idle generating unit of high pressure dynamic chain type according to control unit；
Step 3: control unit is by sampling generator inlet wire current and busbar voltage, in real time when generator inlet wire works normally
It calculates idle, and the idle generating unit of high pressure dynamic chain type is controlled according to idle situation and carries out tracing compensation；
Step 4: maintenance for generation companies or other abnormal conditions, when spare inlet wire comes into operation, control unit automatically controls investment
The controllable switching parallel reactance unit of high pressure.
7. the control method that electricity according to claim 6 opens standby change dynamic passive compensation, which is characterized in that the step
In four, control unit automatically control method the following steps are included:
For A when on bus being zero load, the controllable parallel reactance unit of high pressure carries out overcompensation to cable and other charge powers, makes
The reactive power of spare inlet wire is perception, and control unit detects the idle situation of inlet wire, controls the idle generation of high pressure dynamic chain type
Unit real-time compensation part capacitive reactive power, makes system inlet wire power factor close to 1；
For B when band carries on bus, control unit detects the idle situation of inlet wire, according to real-time idle size and positive and negative controls
The output of high pressure dynamic chain type is idle generating unit, makes system inlet wire power factor close to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811601558.XA CN109687476A (en) | 2018-12-26 | 2018-12-26 | Electricity opens standby change dynamic reactive compensation device and its control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811601558.XA CN109687476A (en) | 2018-12-26 | 2018-12-26 | Electricity opens standby change dynamic reactive compensation device and its control method |
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| CN109687476A true CN109687476A (en) | 2019-04-26 |
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| CN201811601558.XA Pending CN109687476A (en) | 2018-12-26 | 2018-12-26 | Electricity opens standby change dynamic reactive compensation device and its control method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0798838A1 (en) * | 1996-03-29 | 1997-10-01 | STMicroelectronics S.A. | Circuit for improving the power factor using a double discharge |
| CN102882219A (en) * | 2012-10-26 | 2013-01-16 | 株洲变流技术国家工程研究中心有限公司 | Railway power supply system comprehensive electric energy quality treatment device and method thereof |
-
2018
- 2018-12-26 CN CN201811601558.XA patent/CN109687476A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0798838A1 (en) * | 1996-03-29 | 1997-10-01 | STMicroelectronics S.A. | Circuit for improving the power factor using a double discharge |
| CN102882219A (en) * | 2012-10-26 | 2013-01-16 | 株洲变流技术国家工程研究中心有限公司 | Railway power supply system comprehensive electric energy quality treatment device and method thereof |
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