An SVG control device for a multi-section bus

Abstract

The utility model relates to static reactive compensation technical field especially relates to a kind of SVG control device for multi-section bus, the input end of one end of bus tie circuit, grid side one power supply circuit is connected with I section bus respectively, the input end of the other end of bus tie circuit, grid side two power supply circuit is connected with II section bus respectively;It further includes grid side one circuit breaker, grid side two circuit breaker, centralized sampling controller, grid side one circuit breaker is connected with I section bus, grid side two circuit breaker is connected with II section bus, grid side one circuit breaker, grid side two circuit breaker, bus tie circuit is connected with centralized sampling controller.The utility model has the advantages that: centralized sampling controller is connected with each SVG controller, the working state of circuit breaker in the upper switch cabinet in corresponding SVG is transmitted to centralized sampling controller by each SVG controller;Centralized sampling controller is also used to gather the working state transmission of grid side one, grid side two, bus-tie circuit to upper server, and it is convenient for unified monitoring of whole power grid.

Description

TECHNICAL FIELD

[0001] The utility model relates to static var compensation technical field especially relates to a SVG control device for multi -section bus. BACKGROUND

[0002] Static var generator SVG is widely used in the reactive power compensation field of power grid, hospital, photovoltaic, electric arc furnace, rolling mill and the like because of simple structure, fast response speed, high reliability and the like. The mainstream design of most non-important load sites is that several SVGs are hung in a single bus for operation, each SVG is connected with a corresponding SVG controller, the SVG controller is used for collecting the switch cabinet operation state of the corresponding SVG, and it is judged whether the single bus where the SVG is located is in a working state.

[0003] For some important occasions, such as power grid, in order to ensure uninterrupted power supply, the user adopts the operation mode of multi-section bus power supply, for example, the I section bus and the II bus are connected through the bus return circuit, and the working state of the bus return circuit and the I section bus and the II bus usually needs to be regularly inspected and recorded by an inspector. Due to human intervention, there are often delays, and the recorded data is not true, which has safety hazards and needs to be improved. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a SVG control device for multi -section bus, which does not need manual inspection and recording, has simple structure and is safe and reliable.

[0005] In order to achieve the above object, the utility model realizes the following technical scheme:

[0006] A SVG control device for multi -section bus, including net side one power supply circuit, net side two power supply circuit, bus return circuit, one end of bus return circuit, the input end of net side one power supply circuit is connected with I section bus respectively, the other end of bus return circuit, the input end of net side two power supply circuit is connected with II section bus respectively, still including net side one circuit breaker, net side two circuit breaker, centralized sampling controller, net side one circuit breaker is connected with I section bus, net side two circuit breaker is connected with II section bus, net side one circuit breaker, net side two circuit breaker, bus return circuit is connected with centralized sampling controller,

[0007] Net side one power supply circuit includes several SVG power supply branches connected with I section bus, and net side two power supply circuit includes several SVG power supply branches connected with II section bus, each SVG power supply branch includes a superior switch cabinet connected in series with a power unit, the input end of the superior switch cabinet is connected with the corresponding bus, and the superior switch cabinet is connected with the corresponding SVG controller, and each SVG controller is connected with the centralized sampling controller through a port.

[0008] The bus tie circuit breaker, the normally open auxiliary contact of the grid side one circuit breaker, the normally open auxiliary contact of the grid side two circuit breaker and the normally open auxiliary contact of the bus tie circuit breaker are connected with the centralized sampling controller through ports respectively.

[0009] One end of the bus tie circuit breaker is connected with the I section bus, and the other end of the bus tie circuit breaker is connected with the II section bus.

[0010] The superior switch cabinet comprises a circuit breaker one, a disconnector and a circuit breaker two connected in sequence, the normally open auxiliary contact of the circuit breaker one, the normally open auxiliary contact of the disconnector and the normally open auxiliary contact of the circuit breaker two are connected with the corresponding SVG controller through ports respectively; the input end of the circuit breaker one is connected with the corresponding bus, and the output end of the circuit breaker two is connected with the corresponding power unit through a reactor.

[0011] The SVG controller and the centralized sampling controller are single board controllers, the single board controller comprises a CPU, a digital quantity input port and a fiber port, the CPU is connected with the digital quantity input port and the fiber port; the SVG controller and the centralized sampling controller are connected through the fiber port;

[0012] Each SVG controller is connected with the normally open auxiliary contact of the circuit breaker two of the corresponding SVG power supply branch, the normally open auxiliary contact of the disconnector and the normally open auxiliary contact of the circuit breaker one through the digital quantity input port;

[0013] The centralized sampling controller is connected with the normally open auxiliary contact of the grid side one circuit breaker, the normally open auxiliary contact of the grid side two circuit breaker and the normally open auxiliary contact of the bus tie circuit breaker through the digital quantity input port.

[0014] The chip of the CPU comprises a DSP and a FPGA, the chip of the DSP is ADSP-21489, and the chip of the FPGA is Altera-5CEFA7.

[0015] The fiber port comprises a fiber connector.

[0016] Compared with the prior art, the utility model has the advantages of:

[0017] 1, the I section bus is connected with the grid side one circuit breaker 1-QF, the II section bus is connected with the grid side two circuit breaker 2-QF, the centralized sampling controller is connected with each SVG controller, and the working state of the circuit breaker in the corresponding SVG superior switch cabinet is transmitted to the centralized sampling controller through each SVG controller; the centralized sampling controller is also used for collecting the working state of the grid side one circuit breaker 1-QF, the grid side two circuit breaker 2-QF and the bus tie circuit breaker 5QF, and the centralized sampling controller transmits the collected working state information to the superior server, so that the whole power grid is monitored uniformly, and the safe and reliable operation of equipment is guaranteed.

[0018] 2. The disconnecting switch QS of each upper switch cabinet as a reliable breakpoint during maintenance is uploaded to the upper server through the centralized sampling controller for maintenance prompt, ensuring the safety of maintenance personnel;

[0019] 3. The circuit breaker one 1QF, the disconnecting switch QS and the circuit breaker two 11QF of the upper switch cabinet are in working state, which are uploaded to the upper server through the centralized sampling controller, so that the operating personnel can know the running state of each SVG at any time through the HIM man-machine interaction screen of the upper server, without manual inspection and record, reducing labor;

[0020] 4. Each SVG controller is connected with the centralized sampling controller through the optical fiber communication port, saving the connection cable, reducing the wiring operation amount, being reliable in operation and convenient in maintenance;

[0021] 5. Each SVG controller is connected with the touch screen through the communication port, so that the maintenance personnel can check the running state of the circuit breaker in the upper switch cabinet through the corresponding touch screen at any time, the fault query is portable and easy to maintain. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structure schematic view of an SVG control device for a multi-section bus.

[0023] Figure 2 It is a structure schematic view of an SVG controller for a multi-section bus. DETAILED DESCRIPTION

[0024] The utility model will be described in detail in combination with the drawings of the specification, but it should be pointed out that the implementation of the utility model is not limited to the following embodiments.

[0025] The following examples are implemented on the premise of the technical scheme of the utility model, and detailed implementation modes and specific operation processes are given, but the protection scope of the utility model is not limited to the following examples. The methods used in the following examples are all conventional methods unless otherwise specified.

[0026] Example 1

[0027] The utility model provides a kind of SVG control device for multi-section bus, including net side one power supply loop, net side two power supply loop, bus loop, net side one circuit breaker 1-QF, net side two circuit breaker 2-QF, centralized sampling controller, net side one circuit breaker 1-QF is incoming line circuit breaker from station transformer I back, net side two circuit breaker 2-QF is incoming line circuit breaker from station transformer II back, the power supply of net side one circuit breaker 1-QF, net side two circuit breaker 2-QF is taken from the lower end of two independent transformers respectively, to avoid one power supply transformer failure or overhaul, the power supply of another transformer can be supplied to all bus through corresponding net side circuit breaker, maximum degree guarantee load uninterrupted power use;The input end of net side one power supply loop and the one end of bus loop are connected with I section bus respectively, the input end of net side two power supply loop and the other end of bus loop are connected with II section bus respectively;Net side one circuit breaker 1-QF is connected with I section bus, and net side two circuit breaker 2-QF is connected with II section bus;Net side one power supply loop includes 1#SVG power supply branch one and 2#SVG power supply branch two connected with I section bus, and net side two power supply loop includes 3#SVG power supply branch three and 4#SVG power supply branch four connected with II section bus, see Figure 1 Each SVG power supply branch includes the upper switch cabinet connected with power unit in series;Each upper switch cabinet includes circuit breaker one QF, disconnecting switch QS, circuit breaker two 11QF connected in sequence, circuit breaker one 1QF is the circuit breaker for the power supply of SVG, is responsible for the power output of SVG loop, disconnecting switch QS is the reliable breakpoint in loop during overhaul, circuit breaker two 11QF is the switch for bypassing charging resistance, energy-saving effect, the input end of circuit breaker one QF is connected with corresponding bus, and the output end of circuit breaker two 11QF is connected with corresponding power unit through reactor;Bus loop includes bus-tie circuit breaker 5QF, one end of bus-tie circuit breaker 5QF is connected with I section bus, and the other end of bus-tie circuit breaker 5QF is connected with II section bus.

[0028] See Figure 2The SVG controller and the centralized sampling controller are single-board controllers, the single-board controller comprising a CPU, a digital input port, a fiber port and a communication port, the chip of the CPU comprising a DSP and an FPGA, the chip of the DSP being ADSP-21489, used for data processing, the chip of the FPGA being Altera-5CEFA7, used for generating a trigger signal and converting the trigger signal into an optical signal; the CPU is connected with the digital input port and the fiber port, the fiber port comprising a fiber connector; the SVG controller and the centralized sampling controller are connected through the fiber port; each SVG controller is connected with the normally open auxiliary contact of the breaker two 11QF of the corresponding SVG power supply branch, the normally open auxiliary contact of the disconnector QS, and the normally open auxiliary contact of the breaker one QF through the digital input port; each SVG controller is connected with the touch screen through the communication port, and the centralized sampling controller is connected with the normally open auxiliary contact of the grid-side breaker one 1-QF, the normally open auxiliary contact of the grid-side breaker two 2-QF, and the normally open auxiliary contact of the bus-tie breaker 5QF through the digital input port; the centralized sampling controller is connected with the bus-tie touch screen through the communication port.

[0029] Working process

[0030] The initial power transmission state is that the first circuit breaker 1-QF is in the closed state, the second circuit breaker 2-QF is in the closed state, the bus tie circuit breaker 5QF is in the open state, and the four sets of SVG devices are independently operated. Taking the 1#SVG as an example, the disconnector 1QS is closed, and then the circuit breaker 1QF is closed. The SVG charges through the charging resistor. When the charging is completed, the SVG controller automatically closes the circuit breaker 2 1QF through the switch output board, and the SVG enters the automatic compensation stage. When the 35kV I section bus loses power, the 1#SVG and the 2#SVG are in the power loss state, and the centralized sampling controller needs to perform parallel compensation processing. The specific operation process is as follows: 1) The 1#SVG controller and the 2#SVG controller detect the voltage transformer signal to determine that the 35kV I section bus loses power, and send an alarm to the user through communication to remind the user of the power failure and wait for the user signal to recover. At the same time, if the user bus tie circuit breaker 5QF is manually operated, the on-site operation and maintenance personnel need to manually close it (if it is automatically operated, then when the 35kV I section bus loses power, the bus tie circuit breaker 5QF has already been automatically closed); 2) When the 5QF circuit breaker is closed, the auxiliary point of the 5QF circuit breaker input into the centralized sampling controller changes from the open point to the closed point, which informs the sampling controller that the on-site bus tie has been closed, and the two-end bus changes from independent operation to parallel operation mode; 3) The centralized sampling controller is connected with each SVG controller through the ST high-speed optical fiber, and the 1#-4#SVG information is retrieved through the uplink and downlink optical fibers to inform each set of SVG devices to output power according to the received instructions. Each set of SVG performs real-time compensation according to the received instructions; 4) When the user repairs the 35kV I section bus power, the bus tie circuit breaker 5QF exits and changes from the closed state to the open state. The centralized sampling controller receives the auxiliary point of the bus tie circuit breaker 5QF from the closed point to the open point, exits the parallel operation mode, and the four sets of SVGs resume independent operation.

[0031] The utility model discloses the first section busbar is connected with net side one circuit breaker 1-QF, the second section busbar is connected with net side two circuit breaker 2-QF, and the centralized sampling controller is connected with every SVG controller, and the working condition of the circuit breaker in the upper switch cabinet in corresponding SVG is transmitted to the centralized sampling controller through every SVG controller, and the centralized sampling controller is still used for gathering the working condition of net side one circuit breaker 1-QF, net side two circuit breaker 2-QF, bus coupler circuit breaker 5QF, and the working condition information that the centralized sampling controller gathers is transmitted to the upper server, and it is convenient for the unified monitoring of whole power network, and the equipment safety, reliable operation are guaranteed, and the isolator QS of every upper switch cabinet is as the reliable breakpoint when overhauling, and is uploaded to the upper server for overhauling prompt through the centralized sampling controller, guarantees the safety of maintenance personnel, and the circuit breaker one 1QF, the isolator QS, the circuit breaker two 11QF of upper switch cabinet are in the working condition, and are uploaded to the upper server through the centralized sampling controller, and the operating personnel understand the running state of every SVG at any time through the HIM man-machine interaction screen of the upper server, do not need artificial inspection, record, reduce the labor force, and every SVG controller is connected with the centralized sampling controller through the optical fiber communication port optical fiber, saves the connecting cable, reduces the wiring operation amount, and reliable operation, convenient maintenance, and every SVG controller is connected with the touch screen through the communication port, and the maintenance personnel can check the circuit breaker running state in the upper switch cabinet at any time through the corresponding touch screen, and the fault inquiry is portable, and is easy to maintain.

Claims

1. An SVG control device for multi-section busbars, comprising a grid-side power supply circuit, a grid-side power supply circuit, and a bus tie circuit, wherein one end of the bus tie circuit and the input end of the grid-side power supply circuit are respectively connected to section I of the busbar, and the other end of the bus tie circuit and the input end of the grid-side power supply circuit are respectively connected to section II of the busbar; characterized in that, The circuit further comprises a first grid-side breaker, a second grid-side breaker and a centralized sampling controller, the first grid-side breaker is connected with the first bus, the second grid-side breaker is connected with the second bus, and the first grid-side breaker, the second grid-side breaker and the bus circuit are connected with the centralized sampling controller. The first grid-side power supply circuit comprises a plurality of SVG power supply branches connected with the first bus, and the second grid-side power supply circuit comprises a plurality of SVG power supply branches connected with the second bus, each SVG power supply branch comprises a superior switch cabinet connected in series with a power unit, the input end of the superior switch cabinet is connected with the corresponding bus, the superior switch cabinet is connected with the corresponding SVG controller, and each SVG controller is connected with the centralized sampling controller through a port.

2. The SVG control device for a multi-section bus of claim 1, wherein, The bus circuit comprises a bus tie breaker, the normally open auxiliary contact of the first grid-side breaker, the normally open auxiliary contact of the second grid-side breaker and the normally open auxiliary contact of the bus tie breaker are respectively connected with the centralized sampling controller through a port.

3. The SVG control device for a multi-section bus of claim 2, wherein, One end of the bus tie breaker is connected with the first bus, and the other end of the bus tie breaker is connected with the second bus.

4. The SVG control device for a multi-section bus of claim 1, wherein, The superior switch cabinet comprises a first breaker, a disconnector and a second breaker connected in sequence, the normally open auxiliary contact of the first breaker, the normally open auxiliary contact of the disconnector and the normally open auxiliary contact of the second breaker are respectively connected with the corresponding SVG controller through a port, the input end of the first breaker is connected with the corresponding bus, and the output end of the second breaker is connected with the corresponding power unit through a reactor.

5. The SVG control device for a multi-section bus of claim 1, wherein, The SVG controller and the centralized sampling controller are single-board controllers, the single-board controller comprises a CPU, a digital quantity input port and a fiber port, the CPU is connected with the digital quantity input port and the fiber port, and the SVG controller and the centralized sampling controller are connected through the fiber port. Each SVG controller is connected with the normally open auxiliary contact of the second breaker, the normally open auxiliary contact of the disconnector and the normally open auxiliary contact of the first breaker of the corresponding SVG power supply branch through the digital quantity input port. The centralized sampling controller is connected with the normally open auxiliary contact of the first grid-side breaker, the normally open auxiliary contact of the second grid-side breaker and the normally open auxiliary contact of the bus tie breaker through the digital quantity input port.

6. The SVG control device for a multi-section bus of claim 1, wherein, The chip of the CPU comprises a DSP and a FPGA, the chip of the DSP is ADSP-21489, and the chip of the FPGA is Altera-5CEFA7.

7. The SVG control device for a multi-section bus of claim 4, wherein, The fiber port comprises a fiber connector.

Images