CN112510721A - Thyristor switching filter and dynamic reactive power compensation device (HVTSF) suitable for high-voltage power grid - Google Patents

Thyristor switching filter and dynamic reactive power compensation device (HVTSF) suitable for high-voltage power grid Download PDF

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CN112510721A
CN112510721A CN201910871011.XA CN201910871011A CN112510721A CN 112510721 A CN112510721 A CN 112510721A CN 201910871011 A CN201910871011 A CN 201910871011A CN 112510721 A CN112510721 A CN 112510721A
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voltage
thyristor
current
energy
hvtsf
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张高锋
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Jiangsu Bayi Electric Appliance Co ltd
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Jiangsu Bayi Electric Appliance Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/30—Reactive power compensation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/40—Arrangements for reducing harmonics

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The thyristor switched filter and dynamic reactive power compensation device (HVTSF) applied to the high-voltage power grid is composed of PT1, PT2, CT1, CT2, a main controller MCP, a light splitter, optical fibers, a filter reactor L, a high-voltage thyristor valve group V and a filter capacitor C. The filter reactor L and the filter reactor C form series resonance at the point of absorbing harmonic frequency, and the harmonic current is effectively absorbed. The high-voltage thyristor valve group V is formed by connecting two thyristor valves in series, in a positive and negative and parallel mode, and the switching time can be accurately controlled. The master controller MCP collects signals through PT1 and CT1 and sends switching action instructions. The light splitter triggers the thyristor to conduct at a proper position. The HVTSF can quickly track sudden change of impact load, realize dynamic reactive compensation and improve the quality of electric energy.

Description

Thyristor switching filter and dynamic reactive power compensation device (HVTSF) suitable for high-voltage power grid
Technical Field
The invention relates to a thyristor switching filter and dynamic reactive power compensation device suitable for a high-voltage power grid, and also relates to a trigger strategy, an energy-taking circuit, an electric connection and a control method. The method is used for power quality management engineering of a power grid, can realize quick non-impact current input and current zero-crossing cutting of a high-voltage filter capacitor bank, has advanced technical indexes, does not need pre-charging and discharging, has no limit on switching time interval, saves a heavy discharge coil and an energy transmission transformer, and belongs to the technical fields of dynamic reactive power compensation, harmonic filtering, comprehensive power quality management and the like of a power system.
Background
The high-voltage high-power electronic device in the modern industrial field is increasingly widely applied, so that the problems of harmonic wave and reactive compensation are increasingly prominent, and the harmonic wave influence generated by the load must be considered while the reactive power of the industrial load is compensated. The TSC (thyristor switched capacitor) device can only solve the problems of insufficient reactive power and low power factor and cannot be used for harmonic suppression, so that most existing TSC devices are used for power grids and are rarely applied in the industrial field. Although the TSF (thyristor switched filter) can simultaneously solve the reactive and harmonic problems, the device is mainly applied to the low-voltage field and is not expanded to the high-voltage application occasions at present.
Most of the commonly used switches of the current TSC devices adopt a thyristor alternating voltage zero-crossing switching strategy, namely, the thyristor is conducted at the time of the zero-crossing of alternating voltage at two ends of the thyristor, so that a compensation capacitor is connected to two ends of a power grid, and the reactive power compensation of the power grid is realized. However, the thyristor is automatically turned off after the current crosses zero, a long pulse trigger mode is required, namely the pulse duration is the same as the TSC conduction time length, and for the TSC device conducting for a long time, the trigger pulse exists for a long time, so that the loss of the device is increased, and the system operation efficiency is reduced. The other scheme is that a trigger narrow pulse is sent when voltage appears at the valve end of the thyristor, but due to the fact that time delay exists in a voltage detection loop, larger impact current can appear when the voltage appears at the two ends of the thyristor and then the trigger is triggered, the current waveform of the TSC device is made to be poor, and larger distortion or even oscillation is generated.
One of the main factors limiting the application of the existing TSC or TSF devices to high-voltage power grids (such as common 6kV,10kV, and 35kV voltage levels) is that the number of thyristors connected in series is large, each thyristor is matched with one trigger plate, the number of trigger plates of each set of device reaches dozens, even hundreds, and the wiring is very complicated. Although the number of trigger boards can be reduced and secondary wiring can be simplified by adopting a wiring mode of connecting a thyristor and a diode in parallel, due to the uncontrollable property of the diode, very large impact current still occurs during first power-on, great harm is generated to a capacitor, particularly the diode, and even the type selection of the power diode is difficult in some occasions.
In order to ensure the consistency of the triggering of the thyristor, the triggering mode cannot adopt electromagnetic triggering but photoelectric triggering, and the triggering TCU plate (thyristor gate triggering unit) at high potential at present must be matched with a heavy energy transmission transformer, so that the manufacturing cost of the product and the weight of the valve body are further increased, and the engineering application of the product is limited. Aiming at various problems existing in the application of the existing TSC or TSF technology in a high-voltage power grid, the invention provides a thyristor switching filter and dynamic reactive power compensation device (abbreviated as 'HVTSF') suitable for the high-voltage power grid, and the device can be directly hung on 6kV,10kV or 35kV, can be used for reactive power compensation and can also be used for harmonic control. The TCU triggering mode with special design is adopted, so that the number of the triggering plates is reduced by nearly 50%, the wiring is simplified, and the running reliability of the device is improved; meanwhile, a combined type narrow pulse triggering strategy based on a voltage zero-crossing interval and a current zero-crossing interval is adopted, so that the defect that a continuous wide triggering pulse is adopted in the traditional voltage zero-crossing switching mode is overcome; in addition, the voltage and current mixed high-potential energy taking circuit suitable for the HVTSF, provided by the invention, avoids a heavy energy transmission transformer, reduces the weight of the valve body and reduces the product cost.
Drawings
FIG. 1 is a HVTSF main wiring diagram of a thyristor switched filter and dynamic reactive power compensation device;
FIG. 2 is a schematic diagram of a combined narrow pulse trigger strategy based on voltage zero crossing and current zero crossing;
FIG. 3 is a diagram showing trigger pulse, bus voltage and operating current waveforms corresponding to a combined narrow pulse trigger strategy based on voltage zero crossing and current zero crossing;
fig. 4 is a simplified wiring schematic diagram of an HVTSF trigger board of a thyristor switched filter and dynamic reactive power compensation device;
fig. 5 shows a voltage and current hybrid high-potential energy-taking circuit suitable for HVTSF.
Detailed Description
For the purpose of better understanding the objects, technical solutions and advantages of the present invention, the following detailed description of the present invention with reference to the accompanying drawings and examples should be understood that the specific embodiment described herein is only a preferred embodiment of the present invention, and is only used for explaining the present invention, and not for limiting the scope of the present invention, and all other embodiments obtained by a person of ordinary skill in the art without making creative efforts shall fall within the scope of the present invention.
As shown in fig. 1, the HVTSF main connection diagram of the thyristor switched filter and dynamic reactive power compensation device according to the embodiment of the present invention is composed of a voltage transformer PT1, a voltage transformer PT2, a current transformer CT1, a current transformer CT2, a main controller MCP, a beam splitter, an optical fiber, a filter reactor L, a high-voltage thyristor valve group V, and a filter capacitor C.
The filter reactor L, the filter capacitor C and the high-voltage thyristor valve group V are connected in series for use, the filter reactor L and the filter reactor C form series resonance at a harmonic frequency absorption point, harmonic current is effectively absorbed, the electric energy quality of a system is improved, capacitive fundamental wave reactive power is provided, the power factor of a bus is improved, and the additional loss generated by the reactive power in power grid transmission is reduced. When the harmonic content of the system is low, the filter reactor can be changed into a current-limiting reactor, and the series reactance rate can be set to be 1% -6%. The high-voltage thyristor valve group V is formed by connecting two thyristor valve strings in series in a positive and negative and inverse parallel mode. Compared with a mechanical switching capacitor, the thyristor is contactless in opening and closing, the operation life of the thyristor is almost unlimited, the switching time of the thyristor can be accurately controlled, the capacitor can be connected into a power grid rapidly without impact, impact current and operation difficulty during switching are greatly reduced, the dynamic response time of the thyristor is reduced to 10 ms-20 ms, and the thyristor is very suitable for reactive compensation and harmonic wave control of high-capacity and nonlinear impact load. The HVTSF can quickly track sudden change of impact load, maintain the optimal feed power factor at any time, realize dynamic reactive power compensation, reduce voltage fluctuation, improve the quality of electric energy and save the electric energy.
The master controller MCP collects bus voltage through a voltage transformer PT1, collects compensation load current signals through a current transformer CT1, makes switching judgment of the filter capacitor through signal processing, sends switching action instructions and sends triggering signals. The light splitter triggers the thyristor to conduct at a proper position under the triggering instruction. When the thyristor needs to be turned off, the trigger signal is stopped, and the thyristor is naturally turned off when the current is zero. When the system has emergency such as over-temperature, over-current and the like, the controller MCP can timely turn off the HVTSF system to play a protection role.
At present, most of commonly used switches of TSC devices adopt a thyristor alternating voltage zero-crossing switching strategy, namely, the thyristor is conducted at the time of the zero-crossing of alternating voltage at two ends of the thyristor, so that a compensation capacitor is connected to two ends of a power grid, and the reactive power compensation of the power grid is realized. The switching strategy requires that the trigger signal must exist for a long time, otherwise, the thyristor current is switched off after zero crossing, and for a high-voltage energy taking mode, because of energy taking limitation, the trigger pulse cannot exist for a long time, therefore, the HVTSF adopts a combined type narrow pulse trigger strategy based on a voltage zero crossing interval and a current zero crossing interval, and the trigger strategy is explained as follows.
Fig. 2 is a schematic diagram of the combined type narrow pulse trigger strategy based on the voltage zero-crossing interval and the current zero-crossing interval in the embodiment. Bus voltage U of common connection point is obtained by a voltage transformer PT1pccThe current I at the compensation load side is obtained by a current transformer CT1loadCalculating Q from the above parametersload. Then Q is addedloadAre respectively connected with QinAnd QoutBy comparison, when Q isload≥QinThen, the signal S is transmitted1Setting (S)1= 1); when Q isload≤QoutThen, the signal S is transmitted1Reset (S)1= 0), Q is required to avoid switching oscillationsinShould be greater than QoutAnd the difference value of the two is not less than the HVTSF branch compensation capacity.
Obtaining two-end voltage U of thyristor valve group by voltage transformer PT1VWhen U is formedVAbsolute value of (1 | U)V|≤USETThen, the signal S is transmitted2Setting (S)2= 1); when U is turnedVAbsolute value of (1 | U)V|≥USETThen, the signal S is transmitted2Reset (S)2=0）。USETThe value of (a) should not be too large, and the smaller the value, the smaller the magnitude of the impact current to be applied for the first time.
The current I of the thyristor valve group loop is obtained by a current transformer CT1VWhen I isVAbsolute value of | IV|≤ISETThen, the signal S is transmitted3Setting (S)3= 1); when I isVAbsolute value of | IV|≥ISETThen, the signal S is transmitted3Reset (S)3=0）。ISETThe value of (2) determines the width of the trigger pulse, and the value is not too small to ensure reliable triggering of the thyristor.
When three signals S1、S2、S3Set simultaneously (S)1=1，S 21 and S3= 1), trigger signal SoutSetting (S)out= 1), otherwise SoutReset (S)out=0）。
By adopting the triggering logic, after the valve group is electrified for the first time, the valve group is in a locking state. When the load has a large reactive power compensation requirement and the HVTSF has the input condition, S1= 1; since no current flows through the thyristor valve string at this time, IVAbsolute value of | IV|≤ISETSignal S3= 1; since the current voltage of the capacitor is zero, the signal S is generated when the system voltage reaches near the zero crossing interval2= 1; at this time, S1、S2、S3Set simultaneously (S)1=1，S 21 and S3= 1), trigger signal SoutSet condition (S) is reachedout= 1), the valve block is therefore conductive. From the above analysis, the first conduction of the valve set is near the zero crossing of the system voltage.
In order to further simplify the trigger system, a mode that the forward and reverse valve strings are triggered simultaneously is adopted, namely the trigger signals do not distinguish the forward thyristors from the reverse thyristors, and all the thyristors in the same phase adopt the same trigger signal. Due to the single-phase conduction characteristic of the thyristor, the thyristor under reverse voltage resistance can not be conducted even if a trigger signal is applied, and therefore the strategy can not influence the performance of the valve bank.
When the thyristor valve group is conducted, the self conduction voltage drop of the thyristor is very low and can be approximately ignored compared with the system voltage, so that the signal S2In a continuously active state (S)2= 1); as long as the switching signal remains active (S)1= 1), each time the current enters the zero-crossing interval (S)3= 1), one-time trigger condition (S) is satisfied1=1，S2=1，S3=1，Sout= 1), the controller MCP issues a trigger narrowAnd (4) pulse. From the above analysis, it can be seen that the MCP emits a short trigger pulse when the system voltage is near the peak during turn-on, i.e., near the current zero crossing.
When load reactive power QloadDown to HVTSF exit limit QoutAfter the switching signal is reset (S)1= 0), the controller no longer issues a trigger pulse, the thyristor that has been switched on turns off at the current zero crossing, and the HVTSF device exits.
As shown in fig. 3, it is the trigger pulse, the bus voltage, and the valve string current waveform of the HVTSF filter and dynamic reactive power compensation device of the high voltage thyristor switched filter of the present embodiment. As can be seen from fig. 3, the position of the trigger pulse is not fixed near the voltage peak, and when the capacitor voltage is 0, the first trigger pulse occurs near the zero crossing of the system voltage; when the HVTSF of the thyristor switched filter and dynamic reactive power compensation device is not completely released after the HVTSF exits, and the HVTSF input requirement suddenly occurs in the system, the subsequent first trigger pulse does not necessarily occur near the zero crossing point of the system voltage, but is determined by the current residual voltage value of the capacitor, namely the time when the system voltage is approximately equal to the capacitor voltage. It can also be seen from the above description that the HVTSF with thyristor switched filter and dynamic reactive power compensation device has no switching interval limitation, and the filter capacitor bank can be directly put into use again after exiting, and this characteristic is very suitable for compensation occasions where power fluctuates rapidly.
The combined type narrow pulse triggering strategy based on the voltage zero-crossing interval and the current zero-crossing interval is adopted, the requirement of the thyristor on the pulse length of the TCU of the trigger board card is reduced, and continuous triggering can be realized by adopting short pulses. The HVTSF can realize that the filter capacitor bank is rapidly switched in and out without impact, the switching interval is not limited, and the filter capacitor bank does not need to be provided with a heavy discharge coil and a discharge resistor, so that the engineering design of the filter capacitor bank is simplified, and the loss problem caused by the additionally arranged capacitor discharge equipment is avoided.
As shown in fig. 3, it is a simplified wiring diagram of an HVTSF trigger board of the thyristor switched filter and dynamic reactive power compensation device of the present embodiment. Because the voltage-resistant grade of a single thyristor is limited, in order to meet the application requirement of a high-voltage occasion, the voltage-resistant capacity of the valve group needs to be improved by adopting a mode of connecting a plurality of thyristors in series. The valve group for the alternating current power grid generally adopts a connection mode of inverse parallel connection of positive and negative thyristors, and 2n thyristors are needed for the thyristor valve group consisting of n valve strings.
The thyristors in the HVTSF valve string are named by adding natural numbers from left to right, the upper side is a forward valve string marked by a plus sign, and the lower side is a reverse valve string marked by a minus sign. In the figure, V1+ and V2-are connected in a common cathode mode, V2+ and V3-are connected in a common cathode mode, and the like, so that except for V1-at the first section and Vn + at the tail end, the common cathode mode is adopted for n-1 pairs of forward-reverse parallel thyristors. A pair of thyristors adopting common cathode wiring shares one trigger TCU board, so that except the accident that one thyristor at the head end and the tail end of each thyristor of n thyristor valve strings adopts the independent trigger TCU board, the rest n-1 pairs of thyristors adopt n-1 trigger TCU boards.
According to the simplified wiring scheme, the number of trigger plates of each valve string is reduced from the original 2n blocks (one-to-one triggering) to n +1 blocks (one-to-two triggering), so that the number of trigger TCU plates is greatly reduced.
At present, most of dynamic reactive power compensation devices applied to high-voltage systems are designed by various manufacturers according to the voltage and requirements of users, the thyristor valve group and the corresponding trigger device are respectively designed, the high-voltage thyristor valve group generally adopts a photoelectric trigger mode, a control system remotely transmits a trigger signal to a trigger TCU (thyristor control unit) plate of a valve group unit through an optical fiber, and a working power supply passed by each trigger plate transmits energy through an energy transmission transformer or adopts high-voltage energy taking. The working state of the HVTSF determines that the valve group is in a full-on state and a full-off state, wherein the valve end in the off state has voltage and no current, and the valve end in the full-on state has current and no voltage. Therefore, the common high-voltage energy-taking scheme for the SVC is not suitable for the HVTSF, while the low-voltage energy-sending scheme is heavy and high in cost, and the insulation fit of the energy-sending transformer is increasingly difficult as the voltage level is increased.
In order to solve the problems, the HVTSF of the thyristor switched filter and dynamic reactive power compensation device adopts a novel energy obtaining mode, and the HVTSF specifically comprises the following components: the energy-taking circuit comprises a portable energy-taking CT, a damping capacitor Cs, a damping resistor Rs, rectifier diodes D1, D2, D3 and D4, fast diodes D5, D6 and D7, an energy storage capacitor Cp, voltage stabilizing tubes VT1 and VT2, thyristors SCR1 and SCR2, and an energy-taking circuit is shown in figure 5, wherein V + and V-are a pair of high-power thyristors which are connected in parallel in a positive and negative reverse mode in a main circuit.
The method comprises the steps that working voltage is provided for a trigger plate of the HVTSF on a high-voltage platform, and how to design a primary loop is firstly considered to ensure that an energy taking circuit can obtain energy through voltage and current in a main loop when a thyristor valve is continuously conducted and turned off for a long time. In the HVTSF cut-off state of the thyristor switched filter and dynamic reactive power compensation device, the end of the thyristor valve has voltage and no current, at the moment, the current energy-taking module (rectifier diodes D1, D2, D3 and D4, diode D6, voltage-stabilizing tube VT2 and thyristor SCR 2) does not play a role, and the voltage energy-taking module (damping capacitor C)SDamping resistor RSDiode D5, zener VT1, thyristor SCR 1). When the voltage is in the positive half cycle, the damping capacitor CSAnd a damping resistor RSWhen current flows through the snubber circuit and the D5, the energy storage capacitor Cp starts to be charged to the working voltage required by the trigger plate of the TCU, and the overvoltage bypass circuit bypasses the working voltage, and the specific flow is as follows: when the voltage of the energy storage capacitor of the TCU board exceeds the voltage stabilizing value of the voltage stabilizing tube VT1, the current generated by the voltage stabilizing tube VT1 flows into the gate pole of the thyristor SCR1, so that the thyristor SCR1 is triggered and conducted, and the energy taking loop is bypassed. When the voltage is at the negative half cycle, the voltage energy-taking module is bypassed and does not function due to the presence of the diode D7.
The voltage energy-taking module requires a certain voltage at the valve end of the thyristor, and after the thyristor switched filter and dynamic reactive power compensation device HVTSF is conducted, the voltage at the valve end is 0, at the moment, the voltage energy-taking module loses the function, and the voltage energy-taking module is changed into a current energy-taking module (rectifier diodes D1, D2, D3, D4, diodes D6, voltage regulator VT2 and thyristors SCR 2) to play a role. The energy-taking CT is connected into a main loop of the thyristor valve string, and the connection mode can ensure that when the valve is conducted, the current of the main loop flows through the CT and can provide enough energy for the energy-taking loop. The secondary side of each energy-taking CT is connected with a coil, the coil is connected into a rectifier bridge formed by rectifier diodes D1, D2, D3 and D4 to be converted into direct current, and then the energy-storing capacitor Cp is charged through a diode D6. When the voltage of the energy storage capacitor of the TCU board exceeds the voltage stabilizing value of the voltage stabilizing tube VT2, the current generated by the voltage stabilizing tube VT2 flows into the gate pole of the thyristor SCR2, so that the thyristor SCR2 is triggered and conducted, the energy taking loop is bypassed, namely the output of the rectifier bridge is short-circuited, and the energy storage capacitor is stopped being charged. The energy-taking CT corresponds to valve layers of the thyristor one by one, 1 energy-taking CT is arranged on each layer and is respectively arranged near the corresponding high-potential TCU trigger plate, and an iron core of the energy-taking CT is manufactured by superposing annular silicon steel sheets, so that the possibility of generating partial discharge can be fully reduced.
In order to avoid the mutual influence of the current energy-taking module and the voltage energy-taking module, diodes, namely D5 and D6 in fig. 5, are respectively connected in series at the output ends of the current energy-taking module and the voltage energy-taking module.
The HVTSF valve end of the thyristor switching filter and dynamic reactive power compensation device inevitably has current or voltage, so the energy taking loop can inevitably ensure reliable energy taking under various operation modes of the device and ensure normal triggering of a valve group.
The above-mentioned embodiments are preferred embodiments of the topology of the smart energy internet of things of the park according to the present invention, and the scope of the present invention is not limited thereto, and all equivalent changes in shape and structure according to the present invention are within the protection scope of the present invention.

Claims (4)

1. The thyristor switched filter and dynamic reactive power compensation device (HVTSF) suitable for a high-voltage power grid is characterized by comprising a voltage transformer PT1, a voltage transformer PT2, a current transformer CT1, a current transformer CT2, a main controller MCP, a light splitter, optical fibers, a filter reactor L, a high-voltage thyristor valve group V and a filter capacitor C.
2. The thyristor-switched filter and dynamic reactive power compensation device (HVTSF) for a high voltage power grid according to claim 1, wherein a combined narrow pulse triggering strategy based on voltage zero-crossing and current zero-crossing is adopted, and a voltage transformer PT1 obtains a bus voltage U of the common connection pointpccThe current I at the compensation load side is obtained by a current transformer CT1loadCalculating Q from the above parametersloadThen Q is addedloadAre respectively connected with QinAnd QoutBy comparison, when Q isload≥QinThen, the signal S is transmitted1Setting (S)1= 1); when Q isload≤QoutThen, the signal S is transmitted1Reset (S)1= 0), the voltage transformer PT1 obtains the voltage U at both ends of the thyristor valve groupVWhen U is formedVAbsolute value of (1 | U)V|≤USETThen, the signal S is transmitted2Setting (S)2= 1); when U is turnedVAbsolute value of (1 | U)V|≥USETThen, the signal S is transmitted2Reset (S)2= 0), the thyristor valve group loop current I is obtained by the current transformer CT1VWhen I isVAbsolute value of | IV|≤ISETThen, the signal S is transmitted3Setting (S)3= 1); when I isVAbsolute value of | IV|≥ISETThen, the signal S is transmitted3Reset (S)3= 0), three signals S1、S2、S3Set simultaneously (S)1=1，S21 and S3= 1), trigger signal SoutSetting (S)out= 1), otherwise SoutReset (S)out= 0), the trigger system is further simplified, and a mode that the forward and reverse valve strings are simultaneously triggered is adopted, that is, the trigger signals do not distinguish the forward thyristors from the reverse thyristors, and all the thyristors in the same phase adopt the same trigger signal.
3. The thyristor-switched filter and dynamic reactive power compensation device (HVTSF) suitable for a high voltage power grid according to claim 1, wherein a trigger TCU board suitable for the HVTSF is adopted for simplified wiring, except for V1-in the first section and Vn + in the tail end, a common cathode wiring is adopted for n-1 pairs of positive and negative parallel thyristors, and a pair of thyristors adopting the common cathode wiring share one trigger TCU board.
4. The thyristor-switched filter and dynamic reactive power compensation device (HVTSF) suitable for the high voltage power grid as claimed in claim 1, wherein a voltage and current hybrid high voltage energy-taking circuit suitable for HVTSF is adopted, and in a cut-off state, the thyristor valve end has voltage and no current, at this time, the current energy-taking module (rectifier diodes D1, D2, D3, D4, diode D6, voltage regulator tube VT2, thyristor SCR 2) does not function, and the voltage energy-taking module (damping capacitor C1, D2, D3, D4, diode D6, voltage regulator tube VT2, thyristor SCR 2) does not functionSDamping resistor RSDiode D6, voltage regulator VT1 and thyristor SCR 1) and when the voltage is in the positive half cycle, the damping capacitor CSAnd a damping resistor RSAn absorption loop of the thyristor is formed, when current flows through the absorption circuit and D5, the energy storage capacitor Cp is charged to the working voltage required by the trigger plate of the TCU, the energy storage capacitor Cp is bypassed by an overvoltage bypass circuit, when the voltage is in a negative half cycle, a voltage energy taking module is bypassed due to the existence of a diode D7 and does not play a role, when the valve is conducted, the current of the main loop flows through the CT to provide enough energy for the energy taking loop, the secondary side of the energy taking CT is connected with a coil which is connected to a rectifier bridge formed by rectifier diodes D1, D2, D3 and D4 to be direct current, then the energy storage capacitor Cp is charged through a diode D6, when the voltage of the energy storage capacitor of the TCU plate exceeds the voltage stabilizing value of a voltage regulator VT2, the current generated by the voltage regulator VT2 flows into a gate of the thyristor SCR2, so that the thyristor SCR2 is triggered and conducted, and the energy taking loop is bypassed, and the output of the rectifier bridge is short-circuited, and stopping charging the energy storage capacitor, and in order to avoid mutual influence of the current energy taking module and the voltage energy taking module, diodes are respectively connected in series at the output ends of the current energy taking module and the voltage energy taking module.
CN201910871011.XA 2019-09-16 2019-09-16 Thyristor switching filter and dynamic reactive power compensation device (HVTSF) suitable for high-voltage power grid Pending CN112510721A (en)

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CN201910871011.XA Pending CN112510721A (en) 2019-09-16 2019-09-16 Thyristor switching filter and dynamic reactive power compensation device (HVTSF) suitable for high-voltage power grid

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112688343A (en) * 2021-03-22 2021-04-20 普世通（北京）电气有限公司 High-voltage filtering transient reactive power compensation device
CN115313412A (en) * 2022-09-19 2022-11-08 广州华园智电科技有限公司 Single-phase power capacitor rapid and safe switching method based on thyristor control strategy

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112688343A (en) * 2021-03-22 2021-04-20 普世通（北京）电气有限公司 High-voltage filtering transient reactive power compensation device
CN115313412A (en) * 2022-09-19 2022-11-08 广州华园智电科技有限公司 Single-phase power capacitor rapid and safe switching method based on thyristor control strategy
CN115313412B (en) * 2022-09-19 2023-09-29 广州华园智电科技有限公司 Single-phase power capacitor rapid and safe switching method based on thyristor control strategy

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