CN205176155U - Special high voltage direct current VBE of system judges logic circuit - Google Patents

Abstract

The utility model provides a special high voltage direct current VBE of system judges logic circuit which characterized in that in valves control system, can connect the bypass through logical AND gate () making ability and transverter trigger impulse make, and logical AND gate () output VBE sends trigger impulse to another change of current valve that the change of current valve that switches on belonged to looks, the utility model has the advantages of it is following and beneficial effect: direct current transmission engineering VBE system adopts the import equipment more at present, because external equipment manufacture factory bottles up domestic user's VBE technique, transports the failure mechanism that dimension department can't fully understand and grasp VBE at home, and VBE's failure diagnosis and maintenance scheme still depend on external equipment supplier. The utility model provides a logic circuit of VBE system verifies the back through judging the test, can test and the analysis the crucial signal of VBE system under each operating mode, provides technical support for the production domesticization design of VBE system from now on.

Description

A kind of extra-high voltage direct-current system VBE decision logic circuit

Technical field

The utility model belongs to power domain, especially relates to a kind of extra-high voltage direct-current system VBE decision logic circuit engineering.

Background technology

Along with the fast development of power industry, in order to the requirement of satisfied transferring electricity from the west to the east, large capacity transmission, Chinese D.C. high voltage transmission achieves swift and violent development.The development of direct current transportation equipment becomes studies in China focus, and one-tenth Analysis of Nested Design and the Control protection system design and evaluation thereof of DC transmission system also have certain progress.In DC transmission engineering; converter valve is the nucleus equipment realizing AC and DC conversion; valve base electronic device (ValveBaseElectronics; VBE) drived control and the protection of converter valve is exclusively used in; VBE system is responsible for the instruction of reception top level control protection system and is directly used in the triggering and status monitoring that control converter valve valve block, serves key effect to the safe and stable operation of converter valve.Current DC transmission engineering VBE system many employings import equipment, because overseas equipment manufacturer bottles up the VBE technology of demestic user, domestic O&M department fully cannot understand and grasp the failure mechanism of VBE, and the fault diagnosis of VBE and maintenance program still depend on overseas equipment supplier.

Since Chinese high voltage direct current transmission project puts into operation, there is repeatedly fault in the VBE system of import equipment, causes the attention of studies in China personnel.Current studies in China personnel mainly study from two aspects, and some investigators lays particular emphasis on the analysis of the VBE system failure and the research of solution, and some investigators lays particular emphasis on the localization Design of VBE system.Front portion researcher analyzes some faults occurred in VBE system cloud gray model and proposes corresponding solution, but consider that the reason that analysis of failure occurs is more single, Lan Yuping, the periodical literature " Zhaoqing current conversion station VBE light emission module power supply venture analysis and optimization " that Liu Dong writes is optimized the power supply topology of VBE system light expelling plate, effectively improves the serious consequence that cancellation band charged renewal light emission module work even completely causes; The periodical literature " valve-based electronic device of converter valve loses the research of pulse protection and control " that Zhou Liang, Tang Guangfu, Hao Changcheng etc. write proposes a kind of control strategy avoiding causing because of VBE system triggers pulse missing Control protection system misoperation; Periodical literature that Chen Zhengguang, Tang Guangfu, Wei Xiaoguang etc. write " Yue Loong current conversion station valve-based electronic device of converter valve throws bypass to the research of fault " for throw bypass at the end of there is the problem of false triggering because pulsed frequency conversion produces time delay, a kind of control strategy based on shortest job first algorithm is proposed.Rear portion researchist redesigns this equipment based on the principle of VBE system, VBE system is expected to carry out localization Design, but the VBE system of Practical Project many employings imported with original packaging, the periodical literature " a kind of direct current transportation valve base electronic device of Redundancy Design " that Zheng Yuebin, Chen Guolian, white clouds to fly etc. to write devises a kind of VBE system with redundancy feature, improves stability and the reliability of converter valve.

In order to system in depth analyzes the failure cause of import equipment VBE system, the logical circuit of VBE system need be understood, just the key signal of VBE system under carrying out testing obtaining each operating mode.

Summary of the invention

For the logical circuit of research VBE system, and solve the problem, the utility model provides a kind of extra-high voltage direct-current system VBE decision logic circuit, in valve set control system, bypass be connected by logical AND gate & 1 with transverter trigger pulse is enable enable, logical AND gate & 1 exports VBE another converter valve transmission trigger pulse (namely bypass is to enable mode) to the converter valve place phase of conducting; Transverter trigger pulse is not enable to be connected with door & 2 with transverter trigger pulse enable logic after phase inverter, logical AND gate & 2 output terminal is connected by logical AND gate & 3 in co-bit with change of current transformer breaker, logical AND gate & 3 output terminal is connected with the built vertical XOR gate of converter valve forward voltage, exports VBE and send trigger pulse to converter valve after XOR gate output terminal is connected with Trig control signal XOR gate; Bypass is connected by logical AND gate & 4 in co-bit with change of current transformer breaker after phase inverter enable, low AC voltage is connected by logical AND gate & 5 with logical AND gate & 4 output terminal after phase inverter, and logical AND gate & 5 outputs signal VBE and starts supervision (comprising forward voltage whether to set up, return inspection signal, thyristor BOD) to converter valve and trigger pulse to converter valve.

VBE system screen cabinet as shown in Figure 2; D1 and D2 is CPU board card; correspond to VBE system 1 and system diagram 2 respectively; B1 ~ B6 is that light launches board; for launching trigger pulse, B7 ~ B18 is that light returns inspection Signal reception board, and D19 is board able to programme; B20 and B21 is respectively recovery and protection unit (RPU) in VBE system, for sending enable signal at valve group blocking interval to the RPU in thyristor valve section.

As shown in Figure 3, the optical fiber structure schematic diagram between VBE system hardware board and converter valve, dotted line represents back-up system.Wherein, B1 and B4 forms Optical Transmit Unit 1 (Laserunit1), B2 and B5 composition Laserunit2, B3 and B6 form Laserunit3.Each unit sends four road trigger pulses, and each MSC receives three tunnel light pulses, is then divided into 16 tunnel light pulses, and 15 tunnels send to 15 thyristors respectively, and 1 tunnel turns back to light receiving plate as the inspection signal that returns of MSC; 2 RPU of VBE system launch 8 road enable signals altogether, and the RPU in each thyristor valve section receives two-way enable signal.

Converter valve module two-layer on the corner connection of VBE Systematical control A, B, C three-phase, the distribution principle of trigger pip optical fiber and time inspection signal optical fibre is as follows:

(1) first A phase, then B phase, last C phase;

(2) first upper strata, rear lower floor;

(3) first V1 ~ V15, rear V16 ~ V30.

Concrete process is as shown in Figure 4: B1:U1, B2:U1, B3:U1 provide a road light pulse respectively, deliver to the multimode star coupler (MSC) of A phase ground floor (i.e. A1) first thyristor valve section, then 16 tunnel light pulses are divided into, valve block V1 ~ V15 is given on 15 tunnels wherein, and examine returning X301 ~ X315 that signal delivers to B7 through TVM, the 16th tunnel pulse examines as returning of MSC self the X316 interface that signal delivers to B7.MSC adopts three to get two logics to three road trigger pulses, as long as namely have two-way fiber work normally, any road optical fiber or Optical Transmit Unit damage the normal operation not affecting VBE.

Then, the V16 ~ V30 of B4:U1, B5:U1, B6:U1 and B8 corresponding A phase A1 layer; V1 ~ the V15 of B1:U2, B2:U2, B3:U2 and B9 corresponding A phase A2 layer; V16 ~ the V30 of B4:U2, B5:U2, B6:U2 and B10 corresponding A phase A2 layer.This completes the triggering of valve group and return inspection Fiber connection.It can thus be appreciated that in figure 3, the 4 road trigger pulses of LaserUnit1 are respectively from B1:U1, B4:U1, B1:U2 and B4:U2, LaserUnit2 and LaserUnit3 is similar.

The utility model compared with the existing technology, have the following advantages and beneficial effect: DC transmission engineering VBE system many employings import equipment at present, because overseas equipment manufacturer bottles up the VBE technology of demestic user, domestic O&M department fully cannot understand and grasp the failure mechanism of VBE, and the fault diagnosis of VBE and maintenance program still depend on overseas equipment supplier.The utility model proposes a kind of logical circuit of VBE system, after judging testing authentication, testing and analysis can be carried out to the key signal of VBE system under each operating mode, for the localization Design of VBE system from now on provides technical support.

Accompanying drawing explanation

Fig. 1 is logical organization schematic diagram of the present utility model;

Fig. 2 is VBE system described in the utility model screen cabinet signal end structural representation;

Fig. 3 is the optical fiber structure schematic diagram between VBE system hardware board described in the utility model and converter valve;

Fig. 4 is the fiber cabling figure between VBE system described in the utility model and converter valve.

Embodiment

Below in conjunction with accompanying drawing, the technical solution of the utility model is clearly and completely described:

As shown in Figure 1, the utility model provides a kind of extra-high voltage direct-current system VBE decision logic circuit, in valve set control system, bypass be connected by logical AND gate & 1 with transverter trigger pulse is enable enable, logical AND gate & 1 exports VBE another converter valve transmission trigger pulse [namely bypass is to enable mode] to the converter valve place phase of conducting; Transverter trigger pulse is not enable to be connected with door & 2 with transverter trigger pulse enable logic after phase inverter, logical AND gate & 2 output terminal is connected by logical AND gate & 3 in co-bit with change of current transformer breaker, logical AND gate & 3 output terminal is connected with the built vertical XOR gate of converter valve forward voltage, exports VBE and send trigger pulse to converter valve after XOR gate output terminal is connected with Trig control signal XOR gate; Bypass is connected by logical AND gate & 4 in co-bit with change of current transformer breaker after phase inverter enable, low AC voltage is connected by logical AND gate & 5 with logical AND gate & 4 output terminal after phase inverter, and logical AND gate & 5 outputs signal VBE and starts supervision [comprising forward voltage whether to set up, return inspection signal, thyristor BOD] to converter valve and trigger pulse to converter valve.

VBE system screen cabinet as shown in Figure 2; D1 and D2 is CPU board card; correspond to VBE system 1 and system diagram 2 respectively; B1 ~ B6 is that light launches board; for launching trigger pulse, B7 ~ B18 is that light returns inspection Signal reception board, and D19 is board able to programme; B20 and B21 is respectively recovery and protection unit R PU in VBE system, for sending enable signal at valve group blocking interval to the RPU in thyristor valve section.

As shown in Figure 3, the optical fiber structure schematic diagram between VBE system hardware board and converter valve, dotted line represents back-up system.Wherein, B1 and B4 forms Optical Transmit Unit 1[Laserunit1], B2 and B5 form Laserunit2, B3 and B6 and form Laserunit3.Each unit sends four road trigger pulses, and each MSC receives three tunnel light pulses, is then divided into 16 tunnel light pulses, and 15 tunnels send to 15 thyristors respectively, and 1 tunnel turns back to light receiving plate as the inspection signal that returns of MSC; 2 RPU of VBE system launch 8 road enable signals altogether, and the RPU in each thyristor valve section receives two-way enable signal.

Direct-current transmission valve group has five kinds of states: ground connection, stoppage in transit, for subsequent use, locking and unblock, when valve group is in blocking, threshold voltage monitoring board TVM can automatically detect the forward voltage at controllable silicon valve block two ends and feed back to VBE system, and VBE system also can detect light transmission channel and light whether return inspection passage normal simultaneously.Enable/not enable to enable, Trig control signal, trigger pulse to change of current transformer breaker co-bit, bypass, low AC voltage signal are delivered in VBE by group control system, and then VBE returns inspection state in conjunction with converter valve, determines whether trigger converter valve.Group control system, while sending Trig control signal FCS to VBE system, can send W_FCS signal, for monitoring FCS signal to fault wave recording device.

In the AC system of 50Hz, 20ms is a cycle, and namely 1ms changes 18 °.In watch-dog, the time is transverse axis, and every large lattice are 5ms, point five little lattice, and namely each little lattice are 1ms, the every lattice of the longitudinal axis are the amplitude of 10V, FCS is 20V, and high level keeps 20/3ms, i.e. each valve conducting 120 °, low level keeps 40/3ms, i.e. each valve breakdown 240 °.If " change of current transformer breaker is in co-bit ", " transverter trigger pulse is enable " signal are 1, when VBE detects that the FCS signal rising edge controlled from group reaches 20V, trigger pulse is sent at once to converter valve, if trigger unsuccessful and 20V high level still to exist, then VBE can send trigger pulse to valve again.

Claims (1)

1. an extra-high voltage direct-current system VBE decision logic circuit, it is characterized in that, in valve set control system, bypass be connected by logical AND gate (& 1) with transverter trigger pulse is enable enable, logical AND gate (& 1) exports another converter valve transmission trigger pulse of VBE to the converter valve place phase of conducting; Transverter trigger pulse is not enable to be connected with door (& 2) with transverter trigger pulse enable logic after phase inverter, logical AND gate (& 2) output terminal is connected by logical AND gate (& 3) in co-bit with change of current transformer breaker, logical AND gate (& 3) output terminal is connected with the built vertical XOR gate of converter valve forward voltage, exports VBE and send trigger pulse to converter valve after XOR gate output terminal is connected with Trig control signal XOR gate; Bypass is connected by logical AND gate (& 4) in co-bit with change of current transformer breaker after phase inverter enable, low AC voltage is connected by logical AND gate (& 5) with logical AND gate (& 4) output terminal after phase inverter, logical AND gate (& 5) output signal VBE startup to the supervision of converter valve and trigger pulse to converter valve.