Improved power supply system of A5000 type converter valve VBE control cabinet

Abstract

The utility model relates to an improved power supply system of an A5000 type converter valve VBE control cabinet, and relates to the extra-high voltage converter station converter valve control system technology field, the improved power supply system comprises two triggering and monitoring cabinets, each triggering and monitoring cabinet comprises two power supply boards, and the two power supply boards respectively supply power to one subsystem; each power panel is electrically connected with two external independent 220V direct-current power supplies through an air switch; each power panel converts two independent 220V direct-current power supplies electrically connected with the power panel into 5V direct-current power supplies, couples the 5V direct-current power supplies and then supplies power to the corresponding subsystem. The original two paths of independent 220V direct-current power supply inputs are changed into four paths of 220V direct-current power supply inputs, and the original one path of 5V power supply bus is changed into two paths of 5V power supply buses for respectively supplying power to different subsystems, so that the system can still operate normally even if one path of power supply fails, and the stability and the reliability of the system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of the converter valve control system of extra-high voltage converter station, and particularly relates to an improved power supply system of A5000 type converter valve VBE control machine case. BACKGROUND

[0002] The A5000 I type valve control system VBE device power supply adopts double-redundancy power supply, and the trigger and monitoring machine case power supply board A and B respectively convert the externally connected 1-way DC 220V power supply into DC 5V, and after coupling the 2-way 5V power supply through the machine case backplate, output 1-way power supply and behave as the A and B system main control board and trigger monitoring board power supply.

[0003] If a certain component in the power supply loop is short-circuited, it may cause the 5V power supply to be short-circuited to the ground. Since the 5V power supply is a bus shared circuit, after the 5V power supply ground fault of the board card, the valve control double system will lose power supply instantaneously, and then cause both sets of valve control to be unavailable, and finally lead to valve group locking.

[0004] Therefore, it is necessary to reform the device power supply loop of the A5000 I type valve control system VBE control machine case to avoid the influence of the overall valve control system due to the power failure of a certain power supply. INVENTION CONTENTS

[0005] Therefore, it is necessary to provide an improved power supply system of A5000 type converter valve VBE control machine case, so that each machine case is supplied by two completely independent power supplies at the same time, to solve the problem that in the prior art, if a certain power supply loses power, both sets of valve control will be unavailable, and finally lead to valve group locking, and affect the normal work of the overall valve control system.

[0006] An improved power supply system of A5000 type converter valve VBE control machine case, the VBE control machine case comprises two trigger and monitoring machine cases, each trigger and monitoring machine case comprises two power supply boards, and the two power supply boards supply power to a subsystem respectively.

[0007] Each power supply board is electrically connected with two independent 220V DC power supplies, and each power supply board converts the two independent 220V DC power supplies electrically connected thereto into 5V DC power supplies and couples the 5V DC power supplies to supply power to the corresponding subsystem.

[0008] Preferably, the power supply board converts the two independent 220V DC power supplies into 5V DC power supplies and couples the 5V DC power supplies to a 5V power supply bus, and supplies power to the optical module of the corresponding trigger and monitoring machine case through the 5V power supply bus.

[0009] Preferably, the power supply loop of each optical module is provided with a power conversion chip.

[0010] The input terminal of each of the power conversion chips is connected to the 5V power bus;

[0011] The output terminal of the power conversion chip outputs a 3.3V DC power supply, which is electrically connected to the 3.3V power input terminal of the optical module.

[0012] Preferably, the two 5V power buses output from the two power boards are coupled through diodes and then input to the input terminal of each power conversion chip.

[0013] Preferably, the power board converts the two independent 220V DC power supplies into 5V DC power supplies, which are then coupled to the 5V power bus via diodes.

[0014] Compared with existing technologies, the advantages of this invention are as follows: It changes the original two independent 220V DC power inputs to four 220V DC power inputs, and the original one 5V power bus to two 5V power buses, each supplying power to different subsystems. This ensures that even if one power supply fails, the system can still operate normally, increasing power redundancy and significantly improving system stability and reliability. The optical module on the trigger and monitoring board is powered by dual 5V power buses, and the two 5V power buses are coupled through diodes to power a shared optical module, ensuring that even if one power supply fails, it will not affect the normal operation of other circuits. Furthermore, each optical module uses an independent power circuit, further enhancing the system's fault isolation performance. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the configuration of the converter valve control system.

[0016] Figure 2 This is a schematic diagram of the external power supply circuit of the existing triggering and monitoring chassis.

[0017] Figure 3 This is a schematic diagram of the internal power supply circuit of the existing triggering and monitoring chassis.

[0018] Figure 4 This is a schematic diagram of the external power supply circuit of the triggering and monitoring chassis provided in the embodiments of this application.

[0019] Figure 5 This is a schematic diagram of the internal power supply circuit of the triggering and monitoring chassis provided in the embodiments of this application.

[0020] Figure 6 This is a schematic diagram of the power circuit of the triggering and monitoring board provided in the embodiment of this application.

[0021] Figure 7This is a schematic diagram of the power supply circuit of the optical module provided in the embodiment of this application.

[0022] Figure 8 This is a schematic diagram of the test points for the optical module power supply short-circuit failure test provided in the embodiments of this application.

[0023] Figure 9 This is a simulation test waveform diagram provided in the embodiments of this application. Detailed Implementation

[0024] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Please see Figures 1-3 , Figure 1 This is a configuration diagram of the converter valve control system. Figure 2 This is a schematic diagram of the external power supply circuit of the existing triggering and monitoring chassis. Figure 3 This is a schematic diagram of the internal power supply circuit of the existing triggering and monitoring chassis.

[0026] The A5000 converter valve control system (VBE, Valve Base Electronics) is equipped with three VBE control cabinets, comprising nine cabinets in total. Six cabinets are for triggering and monitoring, two for communication and control, and one for waveform recording. Each triggering and monitoring cabinet includes two power boards. Each power board connects to an external 220V DC power supply via a circuit breaker, converting the external 220V DC power to 5V DC power. This 5V DC power is coupled through the cabinet backplane to form a shared 5V power bus, supplying power to all optical modules. Because all optical modules share the same 5V power bus, a power failure in any one optical module can affect the normal operation of other optical modules, thus impacting the overall system's operation.

[0027] The improved power supply system for the A5000 converter valve VBE control chassis provided in this application can be found in [reference needed]. Figures 4-7 , Figure 4 This is a schematic diagram of the external power supply circuit for the triggering and monitoring chassis provided in an embodiment of this application; Figure 5 This is a schematic diagram of the internal power supply circuit of the triggering and monitoring chassis provided in the embodiments of this application; Figure 6 This is a schematic diagram of the power circuit of the triggering and monitoring board provided in the embodiments of this application; Figure 7 This is a schematic diagram of the power supply circuit of the optical module provided in the embodiment of this application.

[0028] Among them, such as Figure 4 As shown, the original power supply system of each VBE control box, with two 220V DC power inputs and two power boards (Power Board A and Power Board B) each connected to one power supply via a circuit breaker, has been improved to have four 220V DC power inputs. That is, each power board is electrically connected to two independent 220V DC power supplies via a circuit breaker. For example... Figure 5 As shown, each power board then converts the two independent 220V DC power supplies electrically connected to it into 5V DC power supplies and couples them to supply power to the corresponding subsystem.

[0029] The original dual-redundant power supply was replaced with a quad-redundant power supply (each trigger and monitoring chassis has four 220V DC power inputs). This ensures that even if one or two power supplies fail, the system can still operate normally, greatly improving the system's stability and reliability.

[0030] Each triggering and monitoring chassis is equipped with two power boards, each with two power inputs. These are coupled through a backplane to generate two power buses, which directly power different subsystems. For example... Figure 5 The 5V power bus coupled from power board A supplies power to subsystem A, and the 5V power bus coupled from power board B supplies power to subsystem B. This achieves electrical isolation between the subsystems, further reducing the risk of system failure due to a single point of failure.

[0031] Furthermore, each power board converts two independent 220V DC power supplies to 5V DC power supplies, which are then coupled to form a 5V power bus via diodes. The diodes ensure unidirectional current flow between the 5V power buses, preventing reverse current. Schottky diodes, for example, can be used because they have low forward voltage drop and fast switching speed.

[0032] Furthermore, the power board converts the two independent 220V DC power supplies into 5V DC power supplies and couples them to the 5V power bus, and supplies power to all optical modules of the corresponding triggering and monitoring chassis through the 5V power bus.

[0033] In other words, the original system used a single 5V power bus to supply power to all optical modules. Therefore, a power failure in one optical module could affect the normal operation of the others. The improved system uses two 5V power buses coupled through diodes to supply power to shared optical modules. This allows each optical module to have an independent power circuit, meaning a power failure in one module will only affect that module and will not affect the normal operation of other optical modules. Therefore, this improvement makes the power circuits of the optical modules more reliable and independent, greatly improving the system's stability and fault isolation capabilities.

[0034] Furthermore, such as Figure 7As shown, each optical module has a power conversion chip in its power circuit; the input terminal of each power conversion chip is connected to the 5V power bus; the output terminal of the power conversion chip outputs 3.3V DC power and is electrically connected to the 3.3V power input terminal of the optical module.

[0035] The power conversion chip monitors the output voltage and current. Under normal operating conditions, it converts 5V DC power to 3.3V DC power for the optical modules. A power conversion chip with short-circuit protection can be selected. In short-circuit protection mode, the chip limits the output current to a safe range, preventing overheating and damage. The impact on the bus power supply is minimal, and it does not affect the normal power supply to other optical modules. Specifically, when a short circuit occurs in the 3.3V power circuit of an optical module, the chip responds quickly, limiting the output current to prevent a large current surge to the 5V bus power supply. Furthermore, after entering protection mode, the chip attempts to restore output; however, if the short circuit persists, the chip remains in protected mode to prevent further damage.

[0036] Therefore, this embodiment incorporates a power conversion chip with short-circuit protection to ensure the normal power supply to other optical modules. This prevents the entire system from losing power due to the failure of a single optical module, reducing the impact of the bus power supply. The short-circuit protection mechanism effectively prevents system-level failures caused by a single optical module malfunction, improving the reliability and stability of the entire system, thereby extending its lifespan and reducing maintenance costs.

[0037] Furthermore, the two 5V power buses output from the two power boards are coupled via diodes and then input to the input terminal of each power conversion chip. The 5V power buses, after being coupled via diodes, are connected to the input terminal of the power conversion chip. This ensures unidirectional current flow between the input terminal of the power conversion chip and the 5V power bus, preventing reverse current from affecting the 5V power bus. Even if a single optical module malfunctions, it will not affect other optical modules or the 5V power bus.

[0038] Furthermore, in this application, the optical module of the trigger and monitoring board can also use AVAGO standard components. AVAGO original feedback optical component failures typically result in abnormal output signals and do not cause a short circuit to ground at the power supply terminal. Known failed components have also not shown any short circuit to ground at the power supply terminal, further improving the overall stability of the system.

[0039] Based on the improved power supply system of the A5000 converter valve VBE control chassis provided in the above embodiments, this application has also conducted tests, such as... Figure 8The diagram shown illustrates the test points for the optical module power supply short-circuit failure test, simulating a short circuit in the 3.3V load of a single optical circuit power supply, and monitoring the voltage at each point in the optical module power supply circuit.

[0040] The obtained simulation test waveform is as follows Figure 9 As shown in the test waveform, when the power supply of the optical module (point C) is short-circuited, the voltage after power coupling (point B) of the AB system drops slightly, while the 5V bus voltage (point A) remains unchanged. Therefore, when the output of a single optical module power chip is short-circuited, the impact on the bus power supply is small due to the short-circuit protection function of the power conversion chip, and it does not affect the normal power supply of other optical modules.

[0041] In summary, based on the above improvements, this application provides a highly reliable and stable improved power supply system for the A5000 converter valve VBE control cabinet. By increasing power redundancy, optimizing power distribution, enhancing fault isolation capabilities, and introducing short-circuit protection, the overall performance and reliability of the system are significantly improved. These improvements not only enhance the system's stability and safety but also simplify maintenance and expansion, providing a strong guarantee for the efficient operation of ultra-high voltage converter stations.

Claims

1. An improved power supply system for a VBE control cabinet of an A5000 type converter valve, characterized in that, The VBE control cabinet comprises two trigger and monitoring cabinets respectively, each of the trigger and monitoring cabinets comprises two power supply boards, and each of the two power supply boards supplies power to a subsystem. Each of the power supply boards is electrically connected to two independent 220V direct current power sources through air gaps.

2. The power supply system of claim 1, wherein, Each of the power supply boards converts the two independent 220V direct current power sources into 5V direct current power sources, and couples the 5V direct current power sources to a 5V power bus.

3. The power supply system of claim 2, wherein, Each of the power supply boards converts the two independent 220V direct current power sources into 5V direct current power sources, and couples the 5V direct current power sources to a 5V power bus. Each of the power supply boards converts the two independent 220V direct current power sources into 5V direct current power sources, and couples the 5V direct current power sources to a 5V power bus. Each of the power supply boards converts the two independent 220V direct current power sources into 5V direct current power sources, and couples the 5V direct current power sources to a 5V power bus.

4. The power supply system of claim 3, wherein Each of the power supply boards converts the two independent 220V direct current power sources into 5V direct current power sources, and couples the 5V direct current power sources to a 5V power bus.

5. The power supply system of claim 4, wherein, Each of the power supply boards converts the two independent 220V direct current power sources into 5V direct current power sources, and couples the 5V direct current power sources to a 5V power bus.

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