CN104410081A - Efficient coupling energy taking based high-voltage TSC driving device - Google Patents

Abstract

The invention relates to an efficient coupling energy taking based high-voltage TSC driving device, belongs to the technical field of high-voltage TSC driving, and aims to solve problems such as poor isolation intensity and poor anti-interference ability of a high-voltage TSC driving device at present. The efficient coupling energy taking based high-voltage TSC driving device comprises a signal conditioning module, a control module, an optical fiber transmission module, a DC power supply circuit, a coupling energy taking circuit and a TSC driving circuit, and is characterized in that three-phase voltage and three-phase current at a load side of a power distribution network are inputted into the signal conditioning module, voltage and current signals outputted by the signal conditioning module are transmitted to the control module, switching signals outputted by the control module are transmitted to each thyristor driving board of the TSC driving circuit through an output end of the optical fiber transmission module; high-frequency output of the DC power supply circuit is transmitted to the coupling energy taking circuit, and the coupling energy taking circuit provides a working power supply for each thyristor driving board of the TSC driving circuit; and the thyristor driving boards output driving signals to gate poles of thyristors according to zero-cross detection signals and the switching signals of the corresponding thyristors. The efficient coupling energy taking based high-voltage TSC driving device is used for driving high-voltage thyristors.

Description

The high pressure TSC drive unit of energy is got based on efficient coupling

Technical field

The invention belongs to high pressure TSC Driving technique field.

Background technology

High pressure TSC is a kind of common dynamic passive compensation mode, one of its difficult point controlled is that high-pressure thyristor valve sends out the accurately reliable of group and anti-error triggering switching controls, due to the dispersiveness of triggering system and the parameter of thyristor own, the moment of opening of each thyristor in series valve can be caused to be not quite similar, the electric strength difference causing element in valve to bear is larger, consider the features such as element tolerance overvoltage ability fragility inherently, dv/di, di/dt ability to bear difference, the damage of thyristor in valve will be caused, affect the reliability service of device.Therefore in order to ensure the safety of valve, and then the reliability service of assurance device, series valve proposes comparatively harsh requirement to triggering system: trigger impulse must possess good simultaneity, certain leading-edge steepness and enough amplitudes.So just be conducive to conducting while thyristor in series valve, alleviate the electric strength that single thyristor bears, guarantee the safe operation of thyristor, also need the isolation strength ensureing low-pressure side control loop and high pressure major loop simultaneously.And each thyristor driving circuit drives single thyristor, because every block drive circuit has earth potential alone, otherwise triggering signal is subject to external interference, therefore needs each drive plate isolation power supply.

Traditional electromagnetism triggers has distinct disadvantage: the leakage inductance 1) in pulse transformer loop will make trigger impulse rising edge steepness greatly decline; 2) distributed capacitance on the former and deputy limit of pulse transformer defines High-frequency Interference passage, poor anti jamming capability.And each thyristor driver plate is owing to being connected with thyristor, need that there is independently earth potential, thus realize the key that it is also technology for electric isolution.

Summary of the invention

The object of the invention is, in order to solve current high pressure TSC drive unit isolation strength difference and the problem of poor anti jamming capability, to the invention provides a kind of high pressure TSC drive unit getting energy based on efficient coupling.

The high pressure TSC drive unit getting energy based on efficient coupling of the present invention,

Described drive unit comprises Signal-regulated kinase, control module, optical fiber transmission module, DC power-supply circuit, coupling energy taking circuit and TSC drive circuit;

Three-phase voltage and the three-phase current of power distribution network load-side input to Signal-regulated kinase, the voltage and current signal output of Signal-regulated kinase is connected with the voltage and current signal input of control module, the switching signal output part of control module is connected with the switching signal input part of optical fiber transmission module, and the switching signal output part of optical fiber transmission module is connected with the switching signal input part of each thyristor driver plate of TSC drive circuit simultaneously;

The high-frequency oscillation signal output of DC power-supply circuit is connected with the high-frequency oscillation signal input of coupling energy taking circuit, and each thyristor driver plate that coupling energy taking circuit is TSC drive circuit provides working power;

Thyristor driver plate according to the zero passage detection signal of respective thyristor and the switching signal gate pole output drive signal to described thyristor.

Coupling energy taking circuit comprises multiple power panel, and the high-frequency current output of DC power-supply circuit is connected with the high-frequency current input of multiple power panel simultaneously, and the thyristor driver plate that each power panel is a TSC drive circuit provides working power;

Power panel comprises pulse generator, pulse transformer, high-frequency rectification bridge and Power convert loop;

Pulse generator exports continuous print pulse signal to pulse transformer, the pulse signal of input is coupled to high-frequency rectification bridge by transformer pulse transformer, after the rectification of high-frequency rectification bridge, pulse signal converts the working power voltage of respective thyristor drive plate to through Power convert loop.

The course of work that control module exports switching signal comprises the steps:

Step one: slide window iterative Fourier transform to the voltage and current signal after conditioning, obtains three-phase voltage, the first-harmonic of three-phase current and each harmonic amplitude and phase place, and then obtains real-time active power and reactive power according to reactive power theory;

Step 2: judged reactive power and three-phase voltage by nine domain method, obtains switching signal.

In step one, window iterative Fourier transform is slided to the voltage and current signal after conditioning, obtains three-phase voltage, the first-harmonic of three-phase current and each harmonic amplitude and phase place:

$u_a\left(t\right)=A_{11}\cos \left({\mathrm{\ω}}_{0}t\right)+A_{12}\sin \left({\mathrm{\ω}}_{0}t\right)+\underset{n=2}{\overset{\∞}{\mathrm{\Σ}}}(A_{n1}\cos \left(n{\mathrm{\ω}}_{0}t\right)+A_{n2}\sin \left(n{\mathrm{\ω}}_{0}t\right))$

Wherein, f ₀for mains frequency, ω ₀=2 π f ₀, n is harmonic number, A ₁₁and A ₁₂for two fourier coefficients of fundamental voltage,

$A_{11}=\frac{2}{N}\underset{i=N_{\mathrm{cur}}}{\overset{N_{\mathrm{cur}}-N+1}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos (2\mathrm{\πi}/N),$

$A_{12}=\frac{2}{N}\underset{i=N_{\mathrm{cur}}}{\overset{N_{\mathrm{cur}}-N+1}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin (2\mathrm{\πi}/N),$

Wherein,

$\underset{i=k}{\overset{k+N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos \frac{2\mathrm{\πi}}{N}=\underset{i=k-1}{\overset{k-N}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos \frac{2\mathrm{\πi}}{N}-u_a(k-N)\cos [(k-N)\·\frac{2\mathrm{\π}}{N}]+u_a\left(k\right)\cos (k\·\frac{2\mathrm{\π}}{N}),$

$\underset{i=k}{\overset{k+N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin \frac{2\mathrm{\πi}}{N}=\underset{i=k-1}{\overset{k-N}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin \frac{2\mathrm{\πi}}{N}-u_a(k-N)\sin [(k-N)\·\frac{2\mathrm{\π}}{N}]+u_a\left(k\right)\sin (k\·\frac{2\mathrm{\π}}{N}),$

Periodic sampling point adds up to N, N _curin order to current sampled point, k is positive integer.

In step 2, judged reactive power and three-phase voltage by nine domain method, the method obtaining switching signal is:

1st district: three-phase voltage U and reactive power Q are all in qualified region, the quality of power supply is good, and control module does not send switching signal;

2nd district: three-phase voltage U is qualified, reactive power Q is higher than qualified region, and controller sends input signal, and when three-phase voltage U and reactive power Q are to qualified region, control module stops sending switching signal;

3rd district: three-phase voltage U falls lower limit, reactive power Q exceeds the upper limit, and control module sends switching signal, until reactive power Q is adjusted to qualified region, control module stops sending switching signal;

4th district: three-phase voltage U falls lower limit, reactive power Q is in qualified region, and control module sends switching signal, promote line voltage, ensure that reactive power Q does not drop to reactive power lower limit, until three-phase voltage U is adjusted to qualified region, control module stops sending switching signal simultaneously; 5th district: three-phase voltage U falls lower limit, reactive power Q is lower than qualified region simultaneously, and namely occur reactive power overcompensation phenomenon, control module sends switching signal, and ensures that three-phase voltage U does not exceed the upper limit;

6th district: three-phase voltage U is in qualified region, and reactive power Q exceedes compensatory zone; Control module sends switching signal, and when ensureing excision capacitor, three-phase voltage U does not fall lower limit simultaneously;

7th district: three-phase voltage U exceeds the upper limit, reactive power Q exceedes compensatory zone; Control module sends switching signal, first makes voltage reach the upper limit, now continues to utilize switching signal to adjust capacitor, makes it guarantee power factor PF and enters in claimed range, and make three-phase voltage U not drop to lower limit;

8th district: three-phase voltage U exceeds the upper limit, reactive power Q is in qualified region, and control module sends switching signal, until three-phase voltage U falls after rise to qualified region, ensures that the reactive power Q after regulating still is in qualified region simultaneously;

9th district: three-phase voltage U exceeds the upper limit, and reactive power Q exceeds the upper limit, and control module sends switching signal, until reactive power Q falls back to qualified region, ensures that three-phase voltage U does not exceed the upper limit simultaneously.

Beneficial effect of the present invention is,

Advantage of the present invention is: the present invention adopts indirect optical fiber triggering mode between low voltage control side and high drive side to realize Phototube Coupling, its advantage is: 1) use optical fiber to realize high and low potential isolation and Signal transmissions, easily realize the online prison side of high-pressure thyristor.2) there is desirable electromagnetism interference free performance, be beneficial to the safe operation of high pressure valve and system.3) frequency response of photoelectric device is higher, can obtain dispersed little, along steep light signal, and then produce dispersed little, gate pole trigger impulse that forward position is steep, trigger while being conducive to series thyristor.Each thyristor driver plate adopts independent magnet ring coupling energy taking simultaneously, realizes the independent current potential of each TSC drive circuit.Control module adopts DSP signal processing algorithm fast simultaneously, and namely sliding window discrete fourier algorithm improves conversion speed, makes TSC drive unit response speed very fast, between 10-20ms.

The present invention, when driving thyristor, adopts the mode of Thyristors in series, effectively can improve the voltage withstand class of fling-cut equipment, and the real-time control and the indirect optical fiber that are equipped with control module DSP high speed trigger the synchronous conducting that can realize thyristor simultaneously.Realize proving, this TSC drive unit can be operated in the distribution network up to 10kV.

The space that the present invention adopts improve nine domain method simple at classical nine domain method algorithms, respond on fast basis, be provided with capacitor switching oscillation area, avoid at some operating mode capacitor switching repeatedly, and introduce the space vector coordinate of harmonic content as control strategy, increase the reliability of system works.

Accompanying drawing explanation

Fig. 1 is the principle schematic of getting the high pressure TSC drive unit of energy based on efficient coupling described in embodiment one.

Fig. 2 is the principle schematic of the optical fiber transmission module described in embodiment one.

Fig. 3 is sliding window iterative discrete Fourier transform principle figure.

Fig. 4 is the principle schematic of the coupling energy taking module described in embodiment two.

Fig. 5 is nine domain method principle schematic described in embodiment five.

Embodiment

Embodiment one: composition graphs 1 illustrates present embodiment, the high pressure TSC drive unit getting energy based on efficient coupling described in present embodiment, described drive unit comprises Signal-regulated kinase, control module, optical fiber transmission module, DC power-supply circuit, coupling energy taking circuit and TSC drive circuit;

Three-phase voltage and the three-phase current of power distribution network load-side input to Signal-regulated kinase, the voltage and current signal output of Signal-regulated kinase is connected with the voltage and current signal input of control module, the switching signal output part of control module is connected with the switching signal input part of optical fiber transmission module, and the switching signal output part of optical fiber transmission module is connected with the switching signal input part of each thyristor driver plate of TSC drive circuit simultaneously;

The high-frequency oscillation signal output of DC power-supply circuit is connected with the high-frequency oscillation signal input of coupling energy taking circuit, and each thyristor driver plate that coupling energy taking circuit is TSC drive circuit provides working power;

Thyristor driver plate according to the zero passage detection signal of respective thyristor and the switching signal gate pole output drive signal to described thyristor.

The control module of present embodiment adopts digital processing chip DSP to realize, DSP output signal through indirect optical fiber trigger equipment by signal transmission to driving side, Optical Fiber Transmission comprises optical fiber sending module, transport module and optic fiber transceiver module three part.Fig. 2 describes the formation of Optical Fiber Transmission, and the 3.3V signal sent by DSP to 5V, is passed to high-pressure side through above-mentioned three parts, through thyristor driver plate inputs gate circuit transistor gate after CPLD computing and power amplification through chip adjustment voltage.First the start pulse signal of low-pressure side is converted to light pulse signal through electrical-optical conversion equipment; Light pulse signal by low-power consumption Optical Fiber Transmission to the light-electric pulse converter be arranged on thyristor assembly; The pulse that light-electric pulse converter exports finally is applied on the gate pole of thyristor cell through power amplification again, makes thyristor cell triggering and conducting.Whole triggering signal transmissions process is actual is that an electrical-optical arrives electro-optical signal transfer process again.Indirect type optical fiber triggers advantage and is: optical fiber superior insulation performance can reduce insulation costs, isolated high-voltage side to the electromagnetic interference of low-pressure side.

Zero passage detection module adopts backward diode isolation forceful electric power, the mode of electric resistance partial pressure gathers forceful electric power information, detect zero passage by comparator, and the CPLD provided on corresponding zero cross signal input thyristor driver plate and aforementioned signal carry out the logical operation based on d type flip flop.

Signal edge steepness under optical fiber triggers is nanosecond, meets the requirements completely.Series thyristor has good synchronous conduction under this optical fiber triggers, and efficiently avoid misoperation, improves the stability of a system, ensure its stable operation.

Controlling the Signal-regulated kinase of side, use voltage sensor HPT205A and the non-Hall element of current sensor HCT204A punching of Huo Yuan science and technology, it has cheap, that cost is low feature, is applicable to current development environment.Output signal is input in the middle of DSP after being converted to voltage signal after resistance and OP07.

DSP in present embodiment adopts the chip of TMS320LF2812 model, and it has powerful calculation function and higher sample frequency, can meet real-time and the precision of algorithm completely.The AD sample frequency of TMS320LF2812 chip is 5kHz.

Optical fiber transmission module employing PHILIPPINES T-15212 and R-15212 achieves the Phototube Coupling between high and low pressure side, avoids high-pressure side to the electromagnetic interference of control circuit.

The supply voltage that driving side adopts LT2575 voltage stabilizing chip to obtain being coupled is stabilized in 3.3V and powers to drive plate.Zero passage detection comparator adopts LM393, its working power voltage wide ranges, and current sinking is little, and input offset voltage is little, and common-mode input voltage range is wide, the compatibilities such as output and TTL, DTL, MOS, CMOS.Coupling magnet ring is self-control magnet ring, adopts canoe, carries out equivalence test by Two-port netwerk.

The voltage zero-cross detection signal that LM393 provides is zero passage place high level signal accurately; When zero cross signal and control signal are high level, CPLD provides drive singal, and drive singal finally changes with thyristor both end voltage; The High-speed Control of DSP can make thyristor realize synchronous conducting accurately, and the buffer action of each thyristor driver plate is good, thus the situation avoiding local excess pressure occurs; There is not the negative effects such as current distortion when showing that capacitor drops into excision in experimental result, shows that whole TSC system works is normal, effectively inhibit negative effect; Measure single-phase reactive power and power factor, obvious improvement result after the switching of experimental result surface.

Embodiment two: composition graphs 3 illustrates present embodiment, present embodiment is to the further restriction of getting the high pressure TSC drive unit of energy based on efficient coupling described in embodiment one, coupling energy taking circuit comprises multiple power panel, the high-frequency current output of DC power-supply circuit is connected with the high-frequency current input of multiple power panel simultaneously, and the thyristor driver plate that each power panel is a TSC drive circuit provides working power;

Power panel comprises pulse generator, pulse transformer, high-frequency rectification bridge and Power convert loop;

Pulse generator exports continuous print pulse signal to pulse transformer, the pulse signal of input is coupled to high-frequency rectification bridge by transformer pulse transformer, after the rectification of high-frequency rectification bridge, pulse signal converts the working power voltage of respective thyristor drive plate to through Power convert loop.

Each thyristor driving circuit drives single thyristor, because every block drive circuit has earth potential alone, therefore needs each drive plate isolation power supply.Operation conditions due to compensation arrangement be unfavorable for obtaining in high-pressure side energy required for the work of thyristor driver plate and high-pressure side get can mode unreliable, thus the present invention by low-pressure side send can mode provide working power for thyristor driver plate.Because this getting can mode be that the energy of electronegative potential is delivered on high-tension side thyristor electronic board by suitable mode, so the working power of thyristor electronic board is not by the impact of operating performance of plant, its reliability is also higher.Usually, low-pressure side is sent and electromagnetism can be able to be divided into send energy and photoelectricity to send energy two kinds of modes.The present invention adopts electromagnetism to send can mode.

It can mode be by high-frequency pulse transformer earthy energy delivered to be positioned on high-tension side thyristor electronic board that electromagnetism of the present invention send.Its main composition comprises pulse generator, pulse transformer, high-frequency rectification bridge and Power convert loop, and Fig. 3 is its schematic diagram.In this manner, pulse transformer (self-control magnet ring) has two kinds of functions, i.e. energy transferring and high and low potential isolation.Therefore, when designing pulse transformer, not only to ensure the safety of energy, reliable delivery, also will meet the requirement of high and low potential isolation.Its advantage directly the energy of electronegative potential is delivered to the thyristor electronic board of high potential, and thus the working power of thyristor electronic board is not by the impact of device major loop operating state, and its reliability is higher.Meanwhile, because the energy on thyristor electronic board is comparatively sufficient, the trigger impulse of sufficient length can be obtained, thus meet the particular/special requirement of some devices.

The coupling energy taking module realizing driving side isolated from power is shown in Fig. 3.By peak-to-peak value be 24V oscillator signal (square wave) by wire draw be wound into each group thyristor corresponding drive plate coupling magnet ring on, provide plate side to power by the electromagnetic induction of magnet ring.Low-pressure side energy electromagnetic coupled obtained is through rectifier bridge and the effect of voltage stabilizing chip, and the burning voltage forming 3.3V is that drive plate stablizes continued power.Coupling achieves the electromagnetic isolation between each drive plate, ensure that independently earth potential, eliminates mutual impact.

Embodiment three: present embodiment is that the course of work that control module exports switching signal comprises the steps: to the further restriction of getting the high pressure TSC drive unit of energy based on efficient coupling described in embodiment one

Step one: slide window iterative Fourier transform to the voltage and current signal after conditioning, obtains three-phase voltage, the first-harmonic of three-phase current and each harmonic amplitude and phase place, and then obtains real-time active power and reactive power according to reactive power theory;

Step 2: judged reactive power and three-phase voltage by nine domain method, obtains switching signal.

Utilize instantaneous reactive power theory known, need to extract a phase voltage first-harmonic and other rd harmonic signal, compare conventional phase locked loops hardware phase lock high precision, the software algorithm applied based on sliding window iteration DFT Fourier transform carries out phase signal extraction, as shown in Figure 3.Sliding window iteration DFT has the feature of acquisition process real-time, accuracy, and can accurately ask for harmonic components in load, and algorithm realization is simple, amount of calculation is little, effectively can improve the extraction arithmetic speed to signal and tracking accuracy.

In present embodiment, in step one, adopt voltage sensor to realize to the collection of net side three-phase voltage, adopt current sensor to realize to the collection of net side three-phase current;

The control module of present embodiment adopts digital processing chip DSP to realize, and adopt software processing mode to the process of the voltage and current signal after conditioning, this software is embedded in digital processing chip DSP.Therefore, during signal condition, first by obtaining the switching signal of electric current and voltage after voltage-current sensor after resistance and follower respectively, range of signal is between-1.65V to 1.65V, and the DSP recognizable set in order to make input voltage signal be positioned at 0-3.3V, the ac voltage signal being 0-3.3V by 1.65V direct voltage source lifting in signal conditioning circuit again delivers to the A/D input port of DSP, as the original input signal of DSP.

To the series of algorithms process that original input signal carries out, realize all in dsp, and extract each harmonic, calculate real-time active reactive power and provide thyristor action command according to space vector nine domain method control strategy.

Embodiment four: present embodiment is to the further restriction of getting the high pressure TSC drive unit of energy based on efficient coupling described in embodiment one, in step, window iterative Fourier transform is slided to the voltage and current signal after conditioning, obtains three-phase voltage, the first-harmonic of three-phase current and each harmonic amplitude and phase place:

$u_a\left(t\right)=A_{11}\cos \left({\mathrm{\ω}}_{0}t\right)+A_{12}\sin \left({\mathrm{\ω}}_{0}t\right)+\underset{n=2}{\overset{\∞}{\mathrm{\Σ}}}(A_{n1}\cos \left(n{\mathrm{\ω}}_{0}t\right)+A_{n2}\sin \left(n{\mathrm{\ω}}_{0}t\right))$

Wherein, f ₀for mains frequency, ω ₀=2 π f ₀, n is harmonic number, A ₁₁and A ₁₂for two fourier coefficients of fundamental voltage,

$A_{11}=\frac{2}{N}\underset{i=N_{\mathrm{cur}}}{\overset{N_{\mathrm{cur}}-N+1}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos (2\mathrm{\πi}/N),$

$A_{12}=\frac{2}{N}\underset{i=N_{\mathrm{cur}}}{\overset{N_{\mathrm{cur}}-N+1}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin (2\mathrm{\πi}/N),$

Now introduce sliding-window iterative algorithm, wherein,

$\underset{i=k}{\overset{k+N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos \frac{2\mathrm{\πi}}{N}=\underset{i=k-1}{\overset{k-N}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos \frac{2\mathrm{\πi}}{N}-u_a(k-N)\cos [(k-N)\·\frac{2\mathrm{\π}}{N}]+u_a\left(k\right)\cos (k\·\frac{2\mathrm{\π}}{N}),$

$\underset{i=k}{\overset{k+N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin \frac{2\mathrm{\πi}}{N}=\underset{i=k-1}{\overset{k-N}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin \frac{2\mathrm{\πi}}{N}-u_a(k-N)\sin [(k-N)\·\frac{2\mathrm{\π}}{N}]+u_a\left(k\right)\sin (k\·\frac{2\mathrm{\π}}{N}),$

Periodic sampling point adds up to N, N _curin order to current sampled point, k is positive integer;

K table is when making an inventory of, after first cycle has been looked into, just in order to not be get a whole cycle again to count, just adopt a number, reject the mode of a number, if total counting has arrived kth+n-1 now, so the n of each cycle of storage of array is put us and reject first, up-to-date that is put into, therefore now number from k, n each point participates in Fourier, just in time arrives k+n-1.

When utilizing conventional DFT method, voltage signal expression formula, as formula one, can be expressed as the superposition of fundamental signal and each harmonic signal, wherein f ₀for mains frequency, ω ₀=2 π f ₀, n is harmonic number, A ₁₁, A ₁₂for the fourier coefficient of fundamental voltage, after signal discrete, A ₁₁, A ₁₂expression formula is as formula two, formula three, and periodic sampling point adds up to N, extracts first-harmonic for a phase voltage.

Formula one: $u_a\left(t\right)=A_{11}\cos \left({\mathrm{\ω}}_{0}t\right)+A_{12}\sin \left({\mathrm{\ω}}_{0}t\right)+\underset{n=2}{\overset{\∞}{\mathrm{\Σ}}}(A_{n1}\cos \left(n{\mathrm{\ω}}_{0}t\right)+A_{n2}\sin \left(n{\mathrm{\ω}}_{0}t\right))$

Formula two: $A_{11}=\frac{2}{N}\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos (2\mathrm{\πi}/N)$

Formula three: $A_{12}=\frac{2}{N}\underset{i=0}{\overset{N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin (2\mathrm{\πi}/N)$

In order to instantaneous power calculates real-time, improve formula two, formula three, obtain formula four, formula five, it is by i=N _curinstead of i=0 as calculating starting point.

Formula four: $A_{11}=\frac{2}{N}\underset{i=N_{\mathrm{cur}}}{\overset{N_{\mathrm{cur}}-N+1}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos (2\mathrm{\πi}/N)$

Formula five: $A_{12}=\frac{2}{N}\underset{i=N_{\mathrm{cur}}}{\overset{N_{\mathrm{cur}}-N+1}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin (2\mathrm{\πi}/N)$

Now introduce sliding-window iterative algorithm, schematic diagram such as Fig. 3 this kind of algorithm substantially improves the renewal speed of sampled data, and amount of calculation reduces, and improves algorithm keeps track change in voltage ability.Then in computing formula six, formula seven, cumulative coefficient can be expressed as:, make sample sequence be that on the window of N, order is slided in length, namely allow the data of present sample enter in window, and in window, first data is abandoned, thus accelerates arithmetic speed.

Formula six:

$\underset{i=k}{\overset{k+N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos \frac{2\mathrm{\πi}}{N}=\underset{i=k-1}{\overset{k-N}{\mathrm{\Σ}}}{u}_a\left(i\right)\cos \frac{2\mathrm{\πi}}{N}-u_a(k-N)\cos [(k-N)\·\frac{2\mathrm{\π}}{N}]+u_a\left(k\right)\cos (k\·\frac{2\mathrm{\π}}{N})$

Formula seven:

$\underset{i=k}{\overset{k+N-1}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin \frac{2\mathrm{\πi}}{N}=\underset{i=k-1}{\overset{k-N}{\mathrm{\Σ}}}{u}_a\left(i\right)\sin \frac{2\mathrm{\πi}}{N}-u_a(k-N)\sin [(k-N)\·\frac{2\mathrm{\π}}{N}]+u_a\left(k\right)\sin (k\·\frac{2\mathrm{\π}}{N})$

Embodiment five: composition graphs 4 illustrates present embodiment, present embodiment is to the further restriction of getting the high pressure TSC drive unit of energy based on efficient coupling described in embodiment one, in step 2, judged reactive power and three-phase voltage by nine domain method, the method obtaining switching signal is:

1st district: three-phase voltage U and reactive power Q are all in qualified region, the quality of power supply is good, and control module does not send switching signal;

2nd district: three-phase voltage U is qualified, reactive power Q is higher than qualified region, and controller sends input signal, and when three-phase voltage U and reactive power Q are to qualified region, control module stops sending switching signal;

3rd district: three-phase voltage U falls lower limit, reactive power Q exceeds the upper limit, and control module sends switching signal, until reactive power Q is adjusted to qualified region, control module stops sending switching signal;

4th district: three-phase voltage U falls lower limit, reactive power Q is in qualified region, and control module sends switching signal, promote line voltage, ensure that reactive power Q does not drop to reactive power lower limit, until three-phase voltage U is adjusted to qualified region, control module stops sending switching signal simultaneously; 5th district: three-phase voltage U falls lower limit, reactive power Q is lower than qualified region simultaneously, and namely occur reactive power overcompensation phenomenon, control module sends switching signal, and ensures that three-phase voltage U does not exceed the upper limit;

6th district: three-phase voltage U is in qualified region, and reactive power Q exceedes compensatory zone; Control module sends switching signal, and when ensureing excision capacitor, three-phase voltage U does not fall lower limit simultaneously;

7th district: three-phase voltage U exceeds the upper limit, reactive power Q exceedes compensatory zone; Control module sends switching signal, first makes voltage reach the upper limit, now continues to utilize switching signal to adjust capacitor, makes it guarantee power factor PF and enters in claimed range, and make three-phase voltage U not drop to lower limit;

8th district: three-phase voltage U exceeds the upper limit, reactive power Q is in qualified region, and control module sends switching signal, until three-phase voltage U falls after rise to qualified region, ensures that the reactive power Q after regulating still is in qualified region simultaneously;

9th district: three-phase voltage U exceeds the upper limit, and reactive power Q exceeds the upper limit, and control module sends switching signal, until reactive power Q falls back to qualified region, ensures that three-phase voltage U does not exceed the upper limit simultaneously.

The object of the invention is the negative effect in order to reduce or avoid the false triggering of high pressure TSC valve group, adopt indirect optical fiber circuits for triggering, play the advantages such as its antijamming capability is strong, dispersiveness is little, make high pressure TSC triggering have good isolation strength, prevent thyristor misoperation.And adopt drive plate magnet ring coupling energy taking to realize drive plate potential isolation, thus a kind of high pressure TSC Driving technique based on coupling energy taking circuit proposed.

Claims (5)

1. get the high pressure TSC drive unit of energy based on efficient coupling, it is characterized in that, described drive unit comprises Signal-regulated kinase, control module, optical fiber transmission module, DC power-supply circuit, coupling energy taking circuit and TSC drive circuit;

Three-phase voltage and the three-phase current of power distribution network load-side input to Signal-regulated kinase, the voltage and current signal output of Signal-regulated kinase is connected with the voltage and current signal input of control module, the switching signal output part of control module is connected with the switching signal input part of optical fiber transmission module, and the switching signal output part of optical fiber transmission module is connected with the switching signal input part of each thyristor driver plate of TSC drive circuit simultaneously;

The high-frequency oscillation signal output of DC power-supply circuit is connected with the high-frequency oscillation signal input of coupling energy taking circuit, and each thyristor driver plate that coupling energy taking circuit is TSC drive circuit provides working power;

Thyristor driver plate according to the zero passage detection signal of respective thyristor and the switching signal gate pole output drive signal to described thyristor.

2. the high pressure TSC drive unit getting energy based on efficient coupling according to claim 1, it is characterized in that, coupling energy taking circuit comprises multiple power panel, the high-frequency oscillation signal output of DC power-supply circuit is connected with the high-frequency oscillation signal input of multiple power panel simultaneously, and the thyristor driver plate that each power panel is a TSC drive circuit provides working power;

Power panel comprises pulse generator, pulse transformer, high-frequency rectification bridge and Power convert loop;

Pulse generator exports continuous print pulse signal to pulse transformer, the pulse signal of input is coupled to high-frequency rectification bridge by transformer pulse transformer, after the rectification of high-frequency rectification bridge, pulse signal converts the working power voltage of respective thyristor drive plate to through Power convert loop.

3. the high pressure TSC drive unit getting energy based on efficient coupling according to claim 1, is characterized in that, the course of work that control module exports switching signal comprises the steps:

Step one: slide window iterative Fourier transform to the voltage and current signal after conditioning, obtains three-phase voltage, the first-harmonic of three-phase current and each harmonic amplitude and phase place, and then obtains real-time active power and reactive power according to reactive power theory;

Step 2: judged reactive power and three-phase voltage by nine domain method, obtains switching signal.

4. the high pressure TSC drive unit getting energy based on efficient coupling according to claim 3, it is characterized in that, in step one, window iterative Fourier transform is slided to the voltage and current signal after conditioning, obtains three-phase voltage, the first-harmonic of three-phase current and each harmonic amplitude and phase place:

Wherein, f ₀for mains frequency, ω ₀=2 π f ₀, n is harmonic number, A ₁₁and A ₁₂for two fourier coefficients of fundamental voltage,

Wherein,

Periodic sampling point adds up to N, N _curin order to current sampled point, k is positive integer.

5. the high pressure TSC drive unit getting energy based on efficient coupling according to claim 3, be is characterized in that, in step 2, judged by nine domain method to reactive power and three-phase voltage, and the method obtaining switching signal is:

1st district: three-phase voltage U and reactive power Q are all in qualified region, the quality of power supply is good, and control module does not send switching signal;

2nd district: three-phase voltage U is qualified, reactive power Q is higher than qualified region, and controller sends input signal, and when three-phase voltage U and reactive power Q are to qualified region, control module stops sending switching signal;

3rd district: three-phase voltage U falls lower limit, reactive power Q exceeds the upper limit, and control module sends switching signal, until reactive power Q is adjusted to qualified region, control module stops sending switching signal;

4th district: three-phase voltage U falls lower limit, reactive power Q is in qualified region, and control module sends switching signal, promote line voltage, ensure that reactive power Q does not drop to reactive power lower limit, until three-phase voltage U is adjusted to qualified region, control module stops sending switching signal simultaneously; 5th district: three-phase voltage U falls lower limit, reactive power Q is lower than qualified region simultaneously, and namely occur reactive power overcompensation phenomenon, control module sends switching signal, and ensures that three-phase voltage U does not exceed the upper limit;

6th district: three-phase voltage U is in qualified region, and reactive power Q exceedes compensatory zone; Control module sends switching signal, and when ensureing excision capacitor, three-phase voltage U does not fall lower limit simultaneously;

7th district: three-phase voltage U exceeds the upper limit, reactive power Q exceedes compensatory zone; Control module sends switching signal, first makes voltage reach the upper limit, now continues to utilize switching signal to adjust capacitor, makes it guarantee power factor PF and enters in claimed range, and make three-phase voltage U not drop to lower limit;

8th district: three-phase voltage U exceeds the upper limit, reactive power Q is in qualified region, and control module sends switching signal, until three-phase voltage U falls after rise to qualified region, ensures that the reactive power Q after regulating still is in qualified region simultaneously;

9th district: three-phase voltage U exceeds the upper limit, and reactive power Q exceeds the upper limit, and control module sends switching signal, until reactive power Q falls back to qualified region, ensures that three-phase voltage U does not exceed the upper limit simultaneously.