CN103840473A - Double SVC coordination control device - Google Patents

Abstract

The invention relates to a control device of an electric system static var compensator (SVC), in particular to a double SVC coordination control device. The control device comprises a measuring unit, a voltage adjustor, a distributing unit, a synchronizing system, a protecting unit, an on-off input unit, an on-off output unit and a valve base electronic unit; the measuring unit is respectively connected with the voltage adjustor and the protecting unit, the voltage adjustor is connected with the distributing unit, the protecting unit is respectively connected with the distributing unit and the on-off output unit, the distributing unit is respectively connected with the on-off input unit, the on-off output unit and the valve base electronic unit, and the valve base electronic unit is connected with the synchronizing system and a thyristor control reactor (TCR). Double SVC coordination control is achieved by the adoption of one control system, TCR coordination control and gain optimization under two main transformers in the same transformer substation are achieved, and circulating switching and capacitive reactance interlocking logic of multi-group parallel-connection capacitive circuit branches or sensitive circuit branches under all sections of buses are achieved.

Description

A kind of two cover SVC cooperative control device

Technical field

The present invention relates to the control device of a kind of electric power system static passive compensation device SVC, be specifically related to a kind of two cover SVC cooperative control device.

Background technology

Static Var Compensator (SVC) obtains applying more and more widely in electric power system, and main application is for stablizing line voltage and necessary reactive power compensation being provided.If the short circuit current level in region that SVC joins is lower, between the independent SVC device of controlling, have obvious interaction, cause electrical network destabilizing factor.

Two main transformer low-pressure sides in transformer station are generally fanout operation bus, on each section of bus, install respectively a set of SVC device, every cover SVC control range comprises thyristor-controlled reactor under main transformer (TCR), filter branch and holds branch road, and anti-branch road.The control targets of two cover SVC are high-pressure side or medium voltage side voltage, and two main transformer high-pressure sides and medium voltage side are generally paired running mode, so two cover SVC working control targets are same target voltage.

If two cover SVC adopt independently control system, when a SVC injects when idle, another SVC can respond to adjust busbar voltage.In addition, in order to make comparatively balance of two main transformer low-pressure side bus voltages, the SVC capacity under two main transformers of the reasonable distribution of should trying one's best.In order to coordinate TCR capacity regulating, the throwing of filter branch, shunt capacitance branch road and parallel reactance branch road is moved back, and between two cover autonomous control systems, must rely on communication link to fetch the matching relationship of realizing on controlling, and this control mode is both dumb also unreliable.

Summary of the invention

For the deficiencies in the prior art, the object of this invention is to provide a kind of two cover SVC cooperative control device, the control system that only adopts this control device just can realize the coordination control of two cover SVC, realize in same transformer station coordination control and the gain optimization of TCR under two main transformers, many groups of capacitive branch in parallel under each section of bus or the circulation of perceptual branch road are thrown and are moved back and capacitive reactance interlocking logic; Control mode is flexible, has avoided the phase mutual interference between SVC, has greatly improved stability and the reliability of system.

The object of the invention is to adopt following technical proposals to realize:

The invention provides a kind of two cover SVC cooperative control device, static passive compensation device SVC comprises thyristor-controlled reactor TCR, passive filter, shunt capacitor and shunt reactor, in transformer station, on two main transformer low-pressure side bus, be installed in parallel respectively TCR branch road and corresponding filter branch thereof, some groups of shunt capacitor branch roads and some groups of shunt reactor branch roads, TCR branch road under every main transformer, filter branch, shunt capacitor branch road and shunt reactor branch road belong to the control range of a set of SVC, totally two cover SVC unifications are controlled by cooperative control device,

Its improvements are, described control device comprises measuring unit, voltage regulator, allocation units, synchro system, protected location, switching value input unit, switch amount output unit and valve base electronic unit; Described measuring unit is connected with voltage regulator and protected location respectively; Described voltage regulator is connected with allocation units; Described protected location is connected with allocation units and switch amount output unit respectively; Described allocation units are connected with switching value input unit, switch amount output unit and valve base electronic unit respectively; Described synchro system is connected with valve base electronic unit; Described valve base electronic unit is connected with thyristor-controlled reactor TCR;

Described control device is for the coordination control to two cover static passive compensation device SVC.

Further, described measuring unit, for gathering the voltage and current analog quantity information in the required transformer station of static passive compensation device SVC, is sent to voltage regulator and protected location after processing and calculating;

Described measuring unit comprises that AD conditioning plate and data gather plate; Described AD conditioning plate is responsible for analog signal conditioner and analog-to-digital conversion; Described data gather plate for calculating and processing image data, and carry out integer-period sampled control; Described AD conditioning plate and data gather plate and are installed in cabinet, and whole cabinet is 6 AD conditioning boards of configuration at most, can measure 72 alternating current-direct current passages; The measurement data of each paths passes to data by case back plate and gathers plate.

Further, described AD conditioning plate comprises at least one AD7675 chip, voltage transformer, current transformer and conditioning transport and placing device; The branch road that described current transformer and AD7675 chip connect to form is for measuring secondary current signal, and the branch road that described voltage transformer and AD7675 chip connect to form is for measuring secondary voltage signal; The branch road that described conditioning transport and placing device and AD7675 chip connect to form is for measuring direct current voltage signal; Above-mentioned three branch roads are connected with CPLD chip respectively; The FPGA module that described CPLD chip, lvds driver and data gather plate is connected successively.

Further, described data gather plate and comprise power module, FPGA module and DSP module; Wherein FPGA module is used for the collection control of completion logic decoding, 6 AD conditioning plates and realizes hardware watchdog; Described DSP module, for AD conditioning plate image data is packaged into McBsp form, is exported to light signal by FPGA module and is produced interface, is transmitted through the fiber to voltage regulator and protected location;

Integer-period sampled control has been coordinated by FPGA module and DSP module; Sample frequency is calculated by DSP module, calculates synchronizing voltage frequency, by mouth line, synchronizing voltage frequency is passed to FPGA module; Described FPGA module, according to synchronizing voltage frequency information, is controlled the AD time in conditioning plate sampling interval, completes integer-period sampled control.

Further, described voltage regulator is mounted in tuning controller, the PI link that described voltage regulator is automatic Regulation, and additional idle control, power oscillation damping control and transient state are mended by force control, for realizing the automatic Regulation to electrical network, improve the stability of electrical network;

Tuning controller makes two cover TCR in taking into account pressure regulation, keep the perception of amount of exports constant volume 80% capacity idle, and filter branch or the shunt capacitance branch road of controlling the two cover of input SVC idle to offset unnecessary perception simultaneously, for electrical network provides capacitive reactive power deposit;

(refer to short trouble when large fault occurs in electric power system, the consequence difference that may cause according to fault origination point difference, large fault refers to the stability of a system is endangered to serious short trouble) time, can there is larger variation in power system voltage and power flow, control device detects after the variation of voltage and trend, starts pair transient state of cover SVC and mends by force function;

Transient state is made amends for one's faults by force in journey, control device cuts out the trigger impulse of two cover TCR, make idle being closed of perception of two cover TCR output, be now released by the capacitive reactive power of two cover SVC capacitive reactive power deposits, for the recovery of the power system voltage to after failure removal;

Control device brings into play by voltage link and power link the effect that dynamic reactive regulates, voltage link is by forming every straight link, phase shift link and voltage link proportionality coefficient link, and power link is by forming every straight link, phase shift link and power link proportionality coefficient link; In the time that after voltage ripple of power network, the meritorious fluctuation of circuit and failure removal, power oscillation situation occurs, dynamically control and will make two cover SVC for electric power system provides forward damping action, suppress system oscillation.

Further, described voltage regulator is realized on the adjustable plate of two cover SVC cooperative control devices, and adjustable plate is included as FPGA module and DSP module; Voltage regulator is realized automatism voltage control, permanent admittance control and manual three kinds of control modes of debugging control.

Further, in the time being automatism voltage control mode, described control device carries out PI control according to the voltage condition detecting, voltage-target and the slope value of setting automatically, and controls according to selecting secondary power concussion damping control, transient state control, idle control, under-voltage strategy, secondary overvoltage restriction, TCR overcurrent limiting, gain optimization and monitoring;

In the time that voltage regulator is automatism voltage control mode, it is the PI voltage regulator with slope control; Wherein gain optimization and supervision are controlled and are made voltage regulator have gain-adaptive function; The Bpu calculating is the clean susceptance value in static passive compensation device SVC high-pressure side, convert according to transformer rated capacity and leakage reactance, to obtain secondary side static passive compensation device SVC equivalent susceptance perunit value, after allocation units, obtain respectively the control signal of the trigger angle control signal filtering branch road of each group of thyristor-controlled reactor TCR branch road, some groups of shunt capacitor branch roads and some groups of shunt reactor branch roads.

Damping of power oscillation control is voltage-controlled additional control; Input signal using the active power of transmission line as damping of power oscillation control, time constant be Tw every straight link for eliminating the Line Flow that measures or the average weight of voltage deviation signal, produce the signal that is directly proportional to oscillating component, and output after phase shift is as the additional components of voltage reference value.

Permanent admittance control refers to the TCR branch road and corresponding filter branch, some groups of shunt capacitor branch roads and the some groups of shunt reactor branch roads that overlap SVC according to the susceptance control of setting pair, and making two cover SVC export total susceptance is set point; Manually debugging control refers to according to the angle of setting and triggers each TCR branch road.

Further, described allocation units are according to the adjusting result of calculation of voltage regulator, and sense switch amount input message and protection information in real time, exports the throwing of static passive compensation device SVC parallel branch and move back order and pair trigger command of cover TCR;

The principle in allocation units whens work is: make the perceptual reactive capability of TCR maintain the more than 80% of total capacity, the filter branch of the idle output of perception of its surplus by static passive compensation device SVC or shunt capacitor branch road in addition balance are offset as far as possible;

Voltage control target voltage is lower than the reference value of setting and while exceeding dead zone range, first moves shunt compensation branch road, rear reduction TCR branch road capacity; Described shunt compensation branch road comprises shunt capacitor branch road and shunt reactor branch road;

Voltage control target voltage, higher than the reference value of setting and while exceeding dead zone range, first increases TCR branch road capacity, rear action shunt compensation branch road.

Further,, in steady-state adjustment control procedure, principle when allocation units work is: when the TCR branch road of two cover SVC is all normally worked, and TCR branch road capacity mean allocation; Each group filter branch all puts into operation as far as possible, each group shunt capacitor branch road and shunt reactor branch road are followed circulation and are thrown the principle of moving back, and the alternate turns action successively of the parallel branch under two sections of buses, between shunt capacitor branch road and shunt reactor branch road, carry out capacitive reactance interlocking principle,, while having capacitive branch to drop into, must not drop into perceptual branch road; Or have perceptual branch road to drop under any one section of bus, under two sections of buses, all do not allow to drop into again capacitive branch;

If electrical network breaks down, control system falls condition according to voltage and power fall down condition determines whether that starting transient state mends by force link, and transient state is mended by force after link startup, and the perception output of two cover TCR is all closed; After the strong benefit of transient state finishes, the dynamic reactive adjustment process performance forward damping action of voltage link and power link, help suppresses the oscillatory process of electrical network.

Further, described synchro system is used for realizing two cover TCR synchronizing signal voltages to be calculated, and synchronizing signal voltage calculates and completed by DSP module, exports Optical Fiber Interface Board to, and send to valve base electronic unit by Optical Fiber Interface Board by the mouth line of FPGA module;

Synchro system adopts soft Phase-Locked Synchronous algorithm, follows the tracks of power system voltage fundamental positive sequence phase place; Synchro system detects respectively two sections of busbar voltages, calculates and export the required synchronous voltage signal of two cover TCR, and the synchronous voltage signal of two cover TCR is signal completely independently.

Further, described protected location comprises overvoltage protection, under-voltage protection, overload protection, overcurrent protection and fast tripping protection; When condition meets and the duration is exported corresponding protection action after exceeding the time delay of setting;

By accident pattern menace level, protection action is divided into alarm, locking and locking and tripping operation three classes;

In the time that detection receives the valve request trip signal that valve base electronic unit reports, TCR branch road and tripping operation that locking is corresponding, protection action is realized by DSP module.

Further, described switching value input unit is for receiving the switch position signal and the element protection actuating signal that comprise TCR branch road and corresponding filter branch, some groups of shunt capacitor branch roads and some groups of shunt reactor branch roads, switching value input signal disappears and trembles after processing through switching value input unit, gives allocation units by switching value input unit;

Described switch amount output unit is for realizing point closing operation and the fault trip operation of static passive compensation device SVC shunt capacitor branch road and shunt reactor branch breaker.

Further, described valve base electronic unit is used for generating the trigger impulse of two cover TCR, and gives every thyristor electronic equipment by triggering signal by optical fiber transmission, simultaneously every valve detection case that thyristor electronics TE unit reports of real-time detection; If detect that valve damages the number of plies and is greater than nargin permission, report valve request trip signal to protected location;

Valve base electronic unit comprises CPU board, trigger board and returns examination board;

CPU board, for practical function logic, is forwarded to each trigger board by triggering signal, and receives and process back the information that examination board reports; Trigger board is exported respectively start pulse signal corresponding to each thyristor to valve group TE plate; Return examination board and be responsible for the information that receiving valve group TE plate reports.

Compared with the prior art, the beneficial effect that the present invention reaches is:

1, two cover SVC cooperative control device provided by the invention can coordinate to control two cover SVC simultaneously, comprises that the adjusting of each group of TCR branch road capacity and the automatic cycle of distribution, capacitive branch in parallel or perceptual branch road are thrown to move back.In the time of any one group of TCR branch road or parallel branch fault or maintenance, can automatically adjust control range, the unified all available branch roads of control of coordinating in operational mode allowed band.Two cover SVC cooperative control device provided by the invention improves the stability of line voltage, provides strong dynamic reactive to support for electrical network while breaking down, strengthens the ability of resisting electrical network major break down.The system power vibration of the dynamic passive compensation ability of utilizing SVC after for fault recovery provides the damping action of forward, the pressure of mitigation system vibration unstability.Unified coordination between two covers is controlled and can be avoided again the reciprocation between different SVC, and control mode is flexible, improves stability and the reliability of system.

2, the two cover SVC in transformer station adopt cooperative control device to unify to control, two cover SVC are arranged on respectively the low-voltage bus bar side of two main transformers, controlling target is high-pressure side or medium voltage side voltage, is high-pressure side paired running voltage or the medium voltage side paired running voltage of two main transformers.

Every cover SVC major loop mainly comprises thyristor-controlled reactor (TCR), passive filter, shunt capacitor and shunt reactor.Wherein TCR and shunt reactor are used for exporting lagging reactive power, and passive filter and shunt capacitor are used for exporting capacitive reactive power.The reactive power that can realize SVC output by the Trigger Angle of change TCR is adjustable continuously.Passive filter for suppressing the harmonic wave of TCR generation and the background harmonics of system, can also be avoided occurring parallel resonance some specific subharmonic current in system is exaggerated simultaneously.

3, in the design of two cover SVC cooperative control devices, the good frequency adaptability of two cover SVC has been guaranteed in the integer-period sampled control of measuring unit; Soft phase locked algorithm based on instantaneous reactive makes SVC synchro system have stronger anti-humorous wave interference and anti-unbalance impact; The voltage regulator that coordination is controlled and allocation units have been optimized the reactive apparatus operation distribution of two cover SVC in transformer station.

Accompanying drawing explanation

Fig. 1 is two cover SVC cooperative control device structured flowchart provided by the invention;

Fig. 2 is measuring unit AD conditioning plate structured flowchart provided by the invention;

Fig. 3 is that measuring unit data provided by the invention gather plate structure block diagram;

Fig. 4 is the integer-period sampled control principle block diagram of measuring unit provided by the invention;

Fig. 5 is voltage regulator theory diagram provided by the invention;

Fig. 6 is damping of power oscillation control principle block diagram during take active power as input signal provided by the invention;

Fig. 7 is damping of power oscillation control principle block diagram during take voltage as input signal provided by the invention;

TCR reactive power curve chart when Fig. 8 is electric network fault provided by the invention;

Fig. 9 is synchronous calculating theory diagram provided by the invention.

Embodiment

Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.

As shown in Figure 1, wherein every cover SVC major loop mainly comprises thyristor-controlled reactor (TCR), passive filter, shunt capacitor and shunt reactor to two cover SVC cooperative control device structured flowchart provided by the invention.Wherein TCR and shunt reactor are used for exporting lagging reactive power, and passive filter and shunt capacitor are used for exporting capacitive reactive power.The reactive power that can realize SVC output by the Trigger Angle of change TCR is adjustable continuously.Passive filter for suppressing the harmonic wave of TCR generation and the background harmonics of system, can also be avoided occurring parallel resonance some specific subharmonic current in system is exaggerated simultaneously.

As shown in Figure 1, two cover SVC cooperative control devices comprise measuring unit, voltage regulator, allocation units, synchro system, protected location, switching value input unit, switch amount output unit and valve base electronic unit; Described measuring unit is connected with voltage regulator and protected location respectively; Described voltage regulator is connected with allocation units; Described protected location is connected with allocation units and switch amount output unit respectively; Described allocation units are connected with switching value input unit, switch amount output unit and valve base electronic unit respectively; Described synchro system is connected with valve base electronic unit; Described valve base electronic unit is connected with thyristor-controlled reactor TCR.The principle of each several part is described as follows:

One) measuring unit adopts integer-period sampled control technology, to improve the frequency adaptability of SVC device.Measuring unit is responsible for gathering each voltage, the current analog amount information in the required transformer station of SVC, after processing and calculating, is sent to voltage regulator and protected location.

For weak AC system, often occurrence frequency skew and vibration when generation systems fault.Take electrical network in hiding as example, be receiving end AC system a little less than typical high voltage direct current transmission, in net, power supply point is few, and load is nonlinear civilian electric loading.In the time of fault in ac transmission system, the meritorious regulating power of power supply is inadequate, and system frequency has certain frequency shift (FS), and has low-frequency oscillation.

The sample mode of measuring unit routine is generally fixed intervals sampling, in the time of system generation frequency deviation, causes the problems such as the effective value error of calculation is large, harmonic analysis is inaccurate.

The measuring system of two cover SVC cooperative control devices adopts integer-period sampled control technology, can tracking system frequency change, automatically sampling rate adjusting.The accuracy of effective value calculating and harmonic analysis while guaranteeing system frequency deviation.

Measuring unit hardware components mainly comprises that AD conditioning plate and data gather plate.Wherein AD conditioning plate is responsible for analog signal conditioner and analog-digital conversion function, and its structured flowchart as shown in Figure 2.It is the core of calculating and processing image data that data gather plate, and its structured flowchart as shown in Figure 3.

AD conditioning plate is measured for alternating voltage, electric current and direct voltage, electric current respectively.Core devices is AD7675, voltage transformer, current transformer etc.AD conditioning plate and data gather plate and are installed in cabinet, and the configurable at most 6 conditioning boards of whole cabinet, can measure 72 alternating current-direct current passages.Each paths measurement data passes to data by case back plate and gathers plate.

AD conditioning plate comprises at least one AD7675 chip, voltage transformer, current transformer and conditioning transport and placing device; The branch road that described current transformer and AD7675 chip connect to form is for measuring secondary current signal, and the branch road that described voltage transformer and AD7675 chip connect to form is for measuring secondary voltage signal; The branch road that described conditioning transport and placing device and AD7675 chip connect to form is for measuring direct current voltage signal; Above-mentioned three branch roads are connected with CPLD chip respectively; The FPGA module that described CPLD chip, lvds driver and data gather plate is connected successively.

Data gather plate core devices and comprise power module, FPGA (XC3S500E) module and DSP (TMS320F28335) module.Wherein FPGA (XC3S500E) module is responsible for the function such as collection control and hardware watchdog of completion logic decoding, 6 AD conditioning plates; DSP (TMS320F28335) module is responsible for AD image data to be packaged into McBsp form, export to light signal by FPGA module and produce interface, and by Optical Fiber Transmission to corresponding unit.

Integer-period sampled control principle block diagram as shown in Figure 4.Integer-period sampled function has been coordinated by FPGA and DSP.Sample frequency is calculated by DSP28335, calculates synchronizing voltage frequency, by mouth line, electric voltage frequency is passed to FPGA.FPGA, according to this frequency information, controls the AD time in sampling interval, thereby completes integer-period sampled function.

Two) the PI link that voltage regulator main body is pressure regulation, and add the functions such as idle control, power oscillation damping, strong benefit.Realize the automatic Regulation to electrical network, and improved the stability of electrical network.

Be that system is while laying in more capacitive reactive power deposit when electrical network needs SVC, control system will regulate two cover TCR, make two cover TCR in taking into account pressure regulation, keep the perception of its output idle in higher level as far as possible, the capacitive branch of simultaneously controlling two cover SVC come into operation, the capacitive reactive power that makes larger capacity by with the idle counteracting of two cover TCR perception time for electrical network provides necessary capacitive reactive power deposit.In the time that large fault occurs system, can there is larger variation in system voltage and power flow, and control system detects after the variation of voltage and trend, starts rapidly pair transient state of cover SVC and mends by force function.

Transient state is made amends for one's faults by force in journey, control system is closed the trigger impulse of two cover TCR, the idle moment of perception of two cover TCR output is closed, is now fast released out by the capacitive reactive power of two cover SVC deposits, the system voltage after failure removal is recovered to have played strong supporting role.

Control device brings into play by voltage link and power link the effect that dynamic reactive regulates, voltage link is by forming every straight link, phase shift link and several parts of voltage link proportionality coefficient, and power link is by forming every straight link, phase shift link and several parts of power link proportionality coefficient.In the time that the situations such as power oscillation after voltage ripple of power network, the meritorious fluctuation of circuit, failure removal occur, dynamically control and will make two cover SVC for system provides forward damping action, suppress system oscillation.

Voltage regulator theory diagram as shown in Figure 5.Can realize automatism voltage control, permanent admittance control and manual three kinds of different control modes of debugging control.Its function mainly realizes on the adjustable plate of two cover SVC cooperative control devices, adjustable plate core devices is FPGA (XC3S500E) and DSP (TMS320F28335), and the realization of various control modes mainly completes on DSP (TMS320F28335).

When automatism voltage control mode is effective, control system is carried out PI control according to the voltage condition detecting and voltage-target and the slope value of setting automatically, and can be according to selecting additional POD control, idle control, under-voltage strategy, secondary overvoltage restriction, TCR overcurrent limiting and gain optimization and supervision etc. to control function.

The main body of automatism voltage control is a PI voltage regulator with slope control, and wherein gain optimization and supervision are controlled and made voltage regulator have gain-adaptive function.The Bpu calculating is the clean susceptance value in SVC high-pressure side, need to convert according to transformer rated capacity and leakage reactance, to obtain secondary side SVC equivalent susceptance perunit value, after allocation units, can obtain respectively the trigger angle control signal of each group of TCR branch road and the control signal of each group of parallel branch (comprising filter branch, capacitive compensation branch road, perception compensation branch road).

In control, add power oscillation damping control (POD control), idle control and transient state simultaneously and mended by force the control functions such as control.

Damping of power oscillation (POD) is controlled as voltage-controlled additional control.The input signal of controlling as POD using active power and the voltage of circuit, passes letter form as shown in Figures 6 and 7 substantially.In figure, time constant is Tw every straight link for eliminating the Line Flow that measures or the average weight of voltage deviation signal, produces a signal being directly proportional to oscillating component, and output after suitable phase shift is as the additional components of voltage reference value.

In order to improve the stability of system, SVC needs a large amount of reactive power deposits.Idle control is used for making TCR in taking into account pressure regulation, to keep the perception of its output idle in higher level as far as possible, and it is idle that filter branch and capacitive branch in parallel are used for offsetting its unnecessary perception.

Three) allocation units are responsible for distributing and regulating the reactive apparatus in control range, comprise TCR branch road, filter branch, shunt capacitor branch road and the shunt reactor branch road of two cover SVC, its concrete logic function is mainly in the upper realization of the DSP of adjustable plate (TMS320F28335).

Allocation units control basic principle is: make the perceptual reactive capability of TCR maintain the more than 80% of total capacity, the filter branch of the idle output of perception of its surplus by SVC or shunt capacitor branch road in addition balance are offset as far as possible.When low voltage, first move shunt compensation branch road, rear reduction TCR capacity.When voltage is higher, first increase TCR capacity, rear action shunt compensation branch road.The method emphasis is to guarantee that TCR is as far as possible in higher acceptable operating point, thereby can drop into the capacitive reactive power deposit of larger capacitive reactive power as electrical network.In the time that electrical network normally moves, SVC emphasis is brought into play its voltage regulation function, when low voltage, SVC exits perceptual branch road in parallel first automatically, after the parallel connection perception branch road in all control ranges all exits, if voltage is still on the low side, SVC drops into the capacitive branch in parallel in control range more automatically, if voltage is still on the low side after capacitive branch all drops into, SVC is by idle the perception that reduces TCR output by the capacity that reduces TCR.Otherwise, when voltage is higher, SVC increases the capacity of TCR first automatically, make the idle increase of perception of TCR output, if it is still higher that the capacity of TCR has reached maximum rear voltage, SVC then exits capacitive branch in parallel, still higher if capacitive branch in parallel all exits rear voltage, and SVC drops into perceptual branch road in parallel automatically.

In above-mentioned steady-state adjustment control procedure, the basic principle that two covers are coordinated is: when the TCR branch road of two cover SVC is all normally worked, and TCR capacity mean allocation.Each group filter branch all puts into operation as far as possible, each group shunt capacitance and parallel reactance are followed circulation and are thrown the principle of moving back, and the alternate turns action successively of the parallel branch under two sections of buses, between shunt capacitance and parallel reactance, carry out capacitive reactance interlocking principle, while having capacitive branch to drop into, must not drop into perceptual branch road, vice versa.

If electrical network breaks down, control system falls condition according to voltage and power fall down condition determines whether that starting transient state mends by force link, and transient state is mended by force after link startup, and the perception output of two cover TCR is all closed.After the strong benefit of transient state finishes, the dynamic reactive adjustment process performance forward damping action of voltage link and power link, help suppresses the oscillatory process of electrical network.After electrical network breaks down, as shown in Figure 8, in this figure, the strong locking process of mending of visible TCR transient state and strong benefit of transient state are finished rear dynamic reactive adjustment process to TCR reactive power curve.

Four) synchro system adopts soft Phase-Locked Synchronous algorithm, accurately tracking system voltage fundamental positive sequence phase place.

Synchro system detects respectively two sections of busbar voltages, calculates and export the required synchronizing signal of two cover TCR, and the synchronizing signal of two cover TCR is signal completely independently.Synchronous Computing Principle as shown in Figure 9.Three-phase voltage is through abc-α β conversion filtering zero-sequence component, the input of pi regulator is A, B, the projection of C three-phase voltage space vector on q axle, contains DC component (corresponding fundamental positive sequence), 2 times of power frequency components (corresponding first-harmonic negative phase-sequence) and other high fdrequency component (corresponding harmonic wave).Can suppress 2 times of power frequency components and other high fdrequency component by choose reasonable pi regulator parameter, under state, pi regulator is output as zero at the beginning, dq coordinate system rotates with synchronous speed, DC component is greater than zero pi regulator output on the occasion of dq coordinate system is accelerated, DC component is less than zero pi regulator output on the occasion of dq coordinate system is slowed down, until three-phase voltage positive sequence space vector is locked on the d axle of dq rotational coordinates, pin the phase place of the A phase of fundamental positive sequence; By rational selection pi regulator parameter, can between response speed and filtering characteristic, reach good compromise.

The synchronizing voltage of two TCR calculates and is mainly completed by DSP28335, exports Optical Fiber Interface Board to, and send to VBE unit by Optical Fiber Interface Board by the mouth line of FPGA.

Soft Phase-Locked Synchronous algorithm is based on Instantaneous Power Theory, and the synchronizing signal of output is not subject to negative phase-sequence, zero sequence and harmonic effects, can accurately lock the fundamental positive sequence of distortion input voltage.

Five) protected location mainly comprises the protections such as overvoltage, under-voltage, overload, overcurrent, quick-break.When condition meets and the duration is exported corresponding protection action after exceeding the time delay of setting.By accident pattern menace level, protection action can be divided into alarm, locking and locking and tripping operation three classes.In addition, in the time that detection receives the valve request trip signal that VBE unit reports, TCR branch road and tripping operation that locking is immediately corresponding.Its logic function is mainly in the upper realization of the DSP of baffle (TMS320F28335).

Six) switching value input unit is responsible for receiving switch position signal and the element protection actuating signal etc. of each branch road, and all kinds of switching value input signals disappear through switching value input unit and tremble after processing, give each correlation unit by switching value input unit.Switch amount output unit is mainly responsible for point closing operation and the fault trip operation etc. of each parallel branch circuit breaker.Open into and output Elementary Function and opening entering plate and the upper realization of the DSP (TMS320F28335) that outputs plate respectively.

Seven) trigger impulse of double T CR is responsible for generating in valve base electronics (VBE) unit, and gives every thyristor electronic equipment (TE) by triggering signal by optical fiber transmission.Detect in real time every valve detection case that thyristor TE unit reports simultaneously.If detect that valve damages the number of plies and is greater than nargin permission, report immediately valve request trip signal to protected location.Valve base electronic unit hardware configuration mainly comprises CPU board, trigger board and returns examination board.CPU board is responsible for realizing major function logic, and final triggering signal is forwarded to each trigger board, and receives and process back the information that examination board reports, and core devices is FPGA (XC3S500E) and DSP (TMS320F28335).Trigger board is exported respectively start pulse signal corresponding to each thyristor to valve group TE plate, mainly realizes FPGA (XC3S50AN) is upper.Returning examination board core devices is FPGA (XC3S50AN), is responsible for receiving valve group TE plate reporting information.

The unified coordination that the present invention adopts a kind of two cover SVC cooperative control device to realize two cover SVC controlled, and is convenient to realize the optimal control between two cover SVC, avoids, between two covers, disadvantageous interaction occurs simultaneously.

The measuring system of cooperative control device adopts integer-period sampled technology, guarantees that effective value calculates and the frequency adaptability of harmonic analysis.

The voltage-regulation calculating section of cooperative control device adopts PI to control, and secondary power shakes the multiple control modes such as damping control, transient state control and idle control, realize the stability that has improved electric power system in regulating system voltage, damping system vibration.

The allocation units of cooperative control device are optimized the capacity that distributes two cover SVC effectively, when the TCR branch road in any a set of SVC or the maintenance of all the other parallel branches or fault exit, do not affect the operation of the normal branch road of two cover SVC.The automatic operational mode of all parallel branches under two main transformers is optimized simultaneously and realized to allocation units.

The synchro system of cooperative control device is responsible for accurately following the tracks of two cover TCR synchronizing voltage phase place separately, has guaranteed that the triggering of two cover TCR is not affected by the asymmetric harmonious wave interference of system.

Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.

Claims (13)

1. a two cover SVC cooperative control device, static passive compensation device SVC comprises thyristor-controlled reactor TCR, passive filter, shunt capacitor and shunt reactor, in transformer station, on two main transformer low-pressure side bus, be installed in parallel respectively TCR branch road and corresponding filter branch thereof, some groups of shunt capacitor branch roads and some groups of shunt reactor branch roads, TCR branch road, filter branch, shunt capacitor branch road and shunt reactor branch road under every main transformer belongs to the control range of a set of SVC, and totally two cover SVC unifications are controlled by cooperative control device;

It is characterized in that, described control device comprises measuring unit, voltage regulator, allocation units, synchro system, protected location, switching value input unit, switch amount output unit and valve base electronic unit; Described measuring unit is connected with voltage regulator and protected location respectively; Described voltage regulator is connected with allocation units; Described protected location is connected with allocation units and switch amount output unit respectively; Described allocation units are connected with switching value input unit, switch amount output unit and valve base electronic unit respectively; Described synchro system is connected with valve base electronic unit; Described valve base electronic unit is connected with thyristor-controlled reactor TCR;

Described control device is for the coordination control to two cover static passive compensation device SVC.

2. two cover SVC cooperative control device as claimed in claim 1, it is characterized in that, described measuring unit, for gathering the voltage and current analog quantity information in the required transformer station of static passive compensation device SVC, is sent to voltage regulator and protected location after processing and calculating;

Described measuring unit comprises that AD conditioning plate and data gather plate; Described AD conditioning plate is responsible for analog signal conditioner and analog-to-digital conversion; Described data gather plate for calculating and processing image data, and carry out integer-period sampled control; Described AD conditioning plate and data gather plate and are installed in cabinet, and whole cabinet is 6 AD conditioning boards of configuration at most, can measure 72 alternating current-direct current passages; The measurement data of each paths passes to data by case back plate and gathers plate.

3. two cover SVC cooperative control device as claimed in claim 2, is characterized in that, described AD conditioning plate comprises at least one AD7675 chip, voltage transformer, current transformer and conditioning transport and placing device; The branch road that described current transformer and AD7675 chip connect to form is for measuring secondary current signal, and the branch road that described voltage transformer and AD7675 chip connect to form is for measuring secondary voltage signal; The branch road that described conditioning transport and placing device and AD7675 chip connect to form is for measuring direct current voltage signal; Above-mentioned three branch roads are connected with CPLD chip respectively; The FPGA module that described CPLD chip, lvds driver and data gather plate is connected successively.

4. two cover SVC cooperative control device as claimed in claim 2, is characterized in that, described data gather plate and comprise power module, FPGA module and DSP module; Wherein FPGA module is used for the collection control of completion logic decoding, 6 AD conditioning plates and realizes hardware watchdog; Described DSP module, for AD conditioning plate image data is packaged into McBsp form, is exported to light signal by FPGA module and is produced interface, is transmitted through the fiber to voltage regulator and protected location;

Integer-period sampled control has been coordinated by FPGA module and DSP module; Sample frequency is calculated by DSP module, calculates synchronizing voltage frequency, by mouth line, synchronizing voltage frequency is passed to FPGA module; Described FPGA module, according to synchronizing voltage frequency information, is controlled the AD time in conditioning plate sampling interval, completes integer-period sampled control.

5. two cover SVC cooperative control device as claimed in claim 1, it is characterized in that, described voltage regulator is mounted in tuning controller, described voltage regulator is the PI link of automatic Regulation, and additional idle control, power oscillation damping control and transient state are mended by force control, for realizing the automatic Regulation to electrical network, improve the stability of electrical network;

Tuning controller makes two cover TCR in taking into account pressure regulation, keep the perception of amount of exports constant volume 80% capacity idle, and filter branch or the shunt capacitance branch road of controlling the two cover of input SVC idle to offset unnecessary perception simultaneously, for electrical network provides capacitive reactive power deposit;

In the time that large fault occurs in electric power system, can there is larger variation in power system voltage and power flow, and control device detects after the variation of voltage and trend, starts pair transient state of cover SVC and mends by force function;

Transient state is made amends for one's faults by force in journey, control device cuts out the trigger impulse of two cover TCR, make idle being closed of perception of two cover TCR output, be now released by the capacitive reactive power of two cover SVC capacitive reactive power deposits, for the recovery of the power system voltage to after failure removal;

Control device brings into play by voltage link and power link the effect that dynamic reactive regulates, voltage link is by forming every straight link, phase shift link and voltage link proportionality coefficient link, and power link is by forming every straight link, phase shift link and power link proportionality coefficient link; In the time that after voltage ripple of power network, the meritorious fluctuation of circuit and failure removal, power oscillation situation occurs, dynamically control and will make two cover SVC for electric power system provides forward damping action, suppress system oscillation.

6. two cover SVC cooperative control device as claimed in claim 5, is characterized in that, described voltage regulator is realized on the adjustable plate of two cover SVC cooperative control devices, and adjustable plate is included as FPGA module and DSP module; Voltage regulator is realized automatism voltage control, permanent admittance control and manual three kinds of control modes of debugging control.

7. two cover SVC cooperative control device as claimed in claim 5, it is characterized in that, in the time being automatism voltage control mode, described control device carries out PI control according to the voltage condition detecting, voltage-target and the slope value of setting automatically, and controls according to selecting secondary power concussion damping control, transient state control, idle control, under-voltage strategy, secondary overvoltage restriction, TCR overcurrent limiting, gain optimization and monitoring;

In the time that voltage regulator is automatism voltage control mode, it is the PI voltage regulator with slope control; Wherein gain optimization and supervision are controlled and are made voltage regulator have gain-adaptive function; The Bpu calculating is the clean susceptance value in static passive compensation device SVC high-pressure side, convert according to transformer rated capacity and leakage reactance, to obtain secondary side static passive compensation device SVC equivalent susceptance perunit value, after allocation units, obtain respectively the control signal of the trigger angle control signal filtering branch road of each group of thyristor-controlled reactor TCR branch road, some groups of shunt capacitor branch roads and some groups of shunt reactor branch roads;

Damping of power oscillation control is voltage-controlled additional control; Input signal using the active power of transmission line as damping of power oscillation control, time constant be Tw every straight link for eliminating the Line Flow that measures or the average weight of voltage deviation signal, produce the signal that is directly proportional to oscillating component, and output after phase shift is as the additional components of voltage reference value;

Permanent admittance control refers to the TCR branch road and corresponding filter branch, some groups of shunt capacitor branch roads and the some groups of shunt reactor branch roads that overlap SVC according to the susceptance control of setting pair, and making two cover SVC export total susceptance is set point; Manually debugging control refers to according to the angle of setting and triggers each TCR branch road.

8. two cover SVC cooperative control device as claimed in claim 1, it is characterized in that, described allocation units are according to the adjusting result of calculation of voltage regulator, sense switch amount input message and protection information in real time, the trigger command of order and two cover TCR is moved back in the throwing of output static passive compensation device SVC parallel branch;

The principle in allocation units whens work is: make the perceptual reactive capability of TCR maintain the more than 80% of total capacity, the filter branch of the idle output of perception of its surplus by static passive compensation device SVC or shunt capacitor branch road in addition balance are offset as far as possible;

Voltage control target voltage is lower than the reference value of setting and while exceeding dead zone range, first moves shunt compensation branch road, rear reduction TCR branch road capacity; Described shunt compensation branch road comprises shunt capacitor branch road and shunt reactor branch road;

Voltage control target voltage, higher than the reference value of setting and while exceeding dead zone range, first increases TCR branch road capacity, rear action shunt compensation branch road.

9. two cover SVC cooperative control device as claimed in claim 8, is characterized in that,, in steady-state adjustment control procedure, principle when allocation units work is: when the TCR branch road of two cover SVC is all normally worked, and TCR branch road capacity mean allocation; Each group filter branch all puts into operation as far as possible, each group shunt capacitor branch road and shunt reactor branch road are followed circulation and are thrown the principle of moving back, and the alternate turns action successively of the parallel branch under two sections of buses, between shunt capacitor branch road and shunt reactor branch road, carry out capacitive reactance interlocking principle,, while having capacitive branch to drop into, must not drop into perceptual branch road; Or have perceptual branch road to drop under any one section of bus, under two sections of buses, all do not allow to drop into again capacitive branch;

If electrical network breaks down, control system falls condition according to voltage and power fall down condition determines whether that starting transient state mends by force link, and transient state is mended by force after link startup, and the perception output of two cover TCR is all closed; After the strong benefit of transient state finishes, the dynamic reactive adjustment process performance forward damping action of voltage link and power link, help suppresses the oscillatory process of electrical network.

10. two cover SVC cooperative control device as claimed in claim 1, it is characterized in that, described synchro system is used for realizing two cover TCR synchronizing signal voltages and calculates, synchronizing signal voltage calculates and is completed by DSP module, mouth line by FPGA module exports Optical Fiber Interface Board to, and sends to valve base electronic unit by Optical Fiber Interface Board;

Synchro system adopts soft Phase-Locked Synchronous algorithm, follows the tracks of power system voltage fundamental positive sequence phase place; Synchro system detects respectively two sections of busbar voltages, calculates and export the required synchronous voltage signal of two cover TCR, and the synchronous voltage signal of two cover TCR is signal completely independently.

11. two cover SVC cooperative control devices as claimed in claim 1, is characterized in that, described protected location comprises overvoltage protection, under-voltage protection, overload protection, overcurrent protection and fast tripping protection; When condition meets and the duration is exported corresponding protection action after exceeding the time delay of setting;

By accident pattern menace level, protection action is divided into alarm, locking and locking and tripping operation three classes;

In the time that detection receives the valve request trip signal that valve base electronic unit reports, TCR branch road and tripping operation that locking is corresponding, protection action is realized by DSP module.

12. two cover SVC cooperative control devices as claimed in claim 1, it is characterized in that, described switching value input unit is for receiving the switch position signal and the element protection actuating signal that comprise TCR branch road and corresponding filter branch, some groups of shunt capacitor branch roads and some groups of shunt reactor branch roads, switching value input signal disappears and trembles after processing through switching value input unit, gives allocation units by switching value input unit;

Described switch amount output unit is for realizing point closing operation and the fault trip operation of static passive compensation device SVC shunt capacitor branch road and shunt reactor branch breaker.

13. two cover SVC cooperative control devices as claimed in claim 1, it is characterized in that, described valve base electronic unit is for generating the trigger impulse of two cover TCR, and give every thyristor electronic equipment by triggering signal by optical fiber transmission, detect in real time every valve detection case that thyristor electronics TE unit reports simultaneously; If detect that valve damages the number of plies and is greater than nargin permission, report valve request trip signal to protected location;

Valve base electronic unit comprises CPU board, trigger board and returns examination board;

CPU board, for practical function logic, is forwarded to each trigger board by triggering signal, and receives and process back the information that examination board reports; Trigger board is exported respectively start pulse signal corresponding to each thyristor to valve group TE plate; Return examination board and be responsible for the information that receiving valve group TE plate reports.

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