Redundant high-voltage high-power SVG device

Abstract

The utility model relates to the technical field of high-voltage dynamic reactive compensation, in particular to a redundant high-voltage high-power SVG (static var generator) device, the number of bypass units of each phase is M, N is greater than M, and a power unit of each phase is correspondingly connected with the bypass units; the control unit comprises a first control unit and a second control unit, the first control unit and the second control unit are redundant to each other, and the three-way N SVG power units are respectively connected with the first control unit and the second control unit through optical fibers; the first current sampling unit and the second current sampling unit are both arranged on the grid side of the power unit, the first current sampling unit is connected with the first control unit, and the second current sampling unit is connected with the second control unit. The high-voltage and high-power SVG device has the advantages that the SVG device adopts two sets of controllers which are mutually redundant, and the power units are designed in a modularized redundancy manner, so that the operation stability and reliability of the high-voltage and high-power SVG device are improved, and the long-term safe and stable operation of the high-voltage and high-power SVG device is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to high pressure dynamic reactive compensation technical field especially relates to a kind of redundant high-voltage high-power SVG device. BACKGROUND

[0002] At present, high-voltage high-power static var generator (hereinafter referred to as SVG) device is widely used in 220kV or 500kV regional power grid substation, high-power alternating current electric arc furnace metallurgical enterprise, electrified railway system, offshore oil and gas field platform, high-power electrolytic hydrogen plant and many other power system and industrial user fields, and plays an irreplaceable role in ensuring the safety and stability of power grid and the technical index of industrial user power quality.

[0003] Due to the key role of high-voltage high-power SVG device in the above-mentioned regional power grid substation and important industrial load field, the long-term stable operation of high-voltage high-power SVG device is very important for the safe and stable operation of the above-mentioned regional power grid and industrial load of power system. The conventional high-voltage high-power SVG device adopts a single power unit and a single control system, and the operation reliability cannot meet the requirements of the above-mentioned important load on the operation stability and reliability of high-voltage high-power SVG device. SUMMARY

[0004] The utility model aims at providing a kind of redundant high-voltage high-power SVG device, high-voltage high-power SVG device adopts redundancy structure, improves the stability and reliability of high-voltage high-power SVG device operation.

[0005] To achieve the above-mentioned purpose, the utility model realizes by the following technical scheme:

[0006] A kind of redundant high-voltage high-power SVG device, SVG device is formed by the series connection of three-way N power units, respectively corresponding the A, B, C three-phase of power grid, adopts star or angle structure, also include bypass unit, control unit, sampling unit, the number of bypass unit of each phase is M, N>M, the power unit of each phase is connected with corresponding bypass unit;

[0007] Control unit includes control unit one and control unit two, control unit one and control unit two are redundant, three-way N SVG power units are connected with control unit one and control unit two fiber respectively;

[0008] Sampling unit includes current sampling unit one and current sampling unit two, current sampling unit one and current sampling unit two are all arranged in power unit net side, current sampling unit one is connected with control unit one, and current sampling unit two is connected with control unit two.

[0009] The power unit is a chain SVG, and the chain SVG comprises a connecting piece and at least two H-bridge inverter units, and the at least two H-bridge inverter units are connected in series through the connecting piece.

[0010] Each H-bridge inverter unit comprises a unit control board and an IGBT drive board, the unit control board is connected with the IGBT drive board through a port, the IGBT drive board is connected with a corresponding power unit, and the unit control board is connected with the control unit one and the control unit two through optical fibers respectively; the unit control board comprises a CPLD chip.

[0011] The unit control board is connected with a direct-current capacitor of the power unit, and is used for acquiring a direct-current voltage sampling value.

[0012] The current sampling unit one and the current sampling unit two are current Hall sensors.

[0013] The bypass unit comprises a bypass contactor, and the bypass contactor is connected with the H-bridge inverter unit.

[0014] The control unit one and the control unit two each comprise a controller, a main control chip of each controller comprises a DSP and a FPGA, the chip of the DSP is ADI-21489, the chip of the FPGA is Altera-5CEFA7, and the single-board controller integrates the functions of a CPU board, an analog quantity board, a digital quantity board and a PWM board.

[0015] The control unit one is arranged in the control cabinet one, and the control unit two is arranged in the control cabinet two.

[0016] Compared with the prior art, the SVG device has the advantages that:

[0017] 1. The SVG device adopts two sets of controllers which are redundant to each other, and the power unit is modularized and redundant, so that the stability and reliability of the high-voltage and high-power SVG device are improved, the long-term safe and stable operation of the high-voltage and high-power SVG device is ensured, and the stability and reliability of the high-voltage and high-power SVG device are improved.

[0018] 2. The power unit and the control system both adopt a redundant structure, so that the SVG device can still keep long-term safe and stable operation under the conditions of power unit hardware failure, control system controller board card hardware failure, abnormal optical fiber communication between the control system and the power unit, and the like, the stability and reliability of the high-voltage and high-power SVG device are improved, and the long-term safe and stable operation of the power system and important industrial loads is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a schematic diagram of a redundant high-voltage and high-power SVG device topology structure.

[0020] Figure 2 is a schematic diagram of a power unit structure.

[0021] Figure 3 is a schematic diagram of a redundant control system structure.

[0022] Figure 4 is a cabinet layout of a redundant control system. DETAILED DESCRIPTION

[0023] The utility model will be described in detail below in conjunction 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.

[0024] 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.

[0025] Example 1

[0026] A redundant high-voltage high-power SVG device, comprising a power unit and a control unit, the power unit and the control unit simultaneously adopt a redundant mode. The number of bypass units for each phase is M, and N>M. The power unit of each phase is connected in correspondence with the bypass unit. The power unit is an N-level power unit with online bypass function for each phase. The N-level power unit for each phase has m-level redundancy, that is, at most m-level power units of any phase fail and are automatically bypassed, and the SVG device can maintain a continuous running state. Current Hall sensor one HA and current Hall sensor two HB adopt a redundant design, and there are six current Hall sensors for three-phase power units. The control unit adopts two sets of controllers which are independent of each other and have the same configuration. The unit control board of each power unit is provided with two groups of optical fiber interfaces, which are connected with the two sets of controllers respectively. The two sets of controllers are standby for each other and are in a one-hot standby state when normally operating. After the operating controller fails, the hot standby controller can automatically put into operation, so that the equipment maintains a continuous running state.

[0027] See Figure 1 , see Figure 3 Each phase power unit is connected with control unit one in control cabinet one and control unit two in control cabinet two respectively. The unit control board of the power unit of the N-level SVG device is connected with the controller 1 of the SVG device and the controller 2 of the SVG device through the optical fiber port. The control unit comprises the controller 1 and the controller 2, and the controller 1 and the controller 2 are redundant to each other.

[0028] The controller 1 and the controller 2 both comprise a main control cabinet and a phase control cabinet. The main control chip of the controller comprises a DSP and an FPGA. The chip of the DSP is ADI-21489, and the chip of the FPGA is Altera-5CEFA7. The main control board of the controller comprises a power board, a CPU board, an analog quantity board, a digital quantity board, a PWM board and the like.

[0029] Working principle of controller 1 and controller 2:

[0030] To ensure that each power unit in the N-level SVG device can simultaneously exchange data with controller 1 and controller 2, receive instructions from controller 1 and controller 2, and upload power unit state and operation data information to controller 1 and controller 2, but at the same time, the power unit only receives and executes the instructions of the activated controller 1 or controller 2, that is, controller 1 and controller 2 are independent of each other and have a redundant self-switching function, ensuring that only controller 1 or controller 2 is in an activated state and drives the high-voltage and high-power SVG device to operate at the same time. When the activated controller 1 or controller 2 fails, the controller 1 or controller 2 in the hot standby state can automatically switch to the activated state and drive the high-voltage and high-power SVG device to operate.

[0031] Controller 1 and controller 2 are arranged in the redundant control cabinet body, as shown in Figure 4 .

[0032] Current Hall sensor 1 HA and current Hall sensor 2 HB are used to detect the output current of the power unit. Current Hall sensor 1 HA is connected to controller 1 through a port, and current Hall sensor 2 HB is connected to controller 2 through a port. If the current Hall sensor 1 HA fails to operate normally during the operation of the high-voltage and high-power SVG device, the high-voltage and high-power SVG device can continue to operate safely and stably through the current Hall sensor 2 HB, ensuring that the high-voltage and high-power SVG device will not fail to shut down due to the failure of the output current Hall sensor and its related accessories during normal operation, effectively improving the operation stability and reliability of the high-voltage and high-power SVG device.

[0033] As shown in Figure 2 , each H-bridge inverter unit in the power unit is connected to the corresponding bypass contactor, and the bypass contactor is driven by the power unit control panel. When the power unit fails irreparably, the control unit sends a power unit bypass contactor closing instruction to the power unit control panel to drive the power unit bypass contactor to close. The AC output side of the faulty power unit is short-circuited by the power unit bypass contactor, and the faulty power unit is removed from the system while the high-voltage and high-power SVG device remains in a high-voltage continuous operation state, realizing the power unit redundancy and automatic online bypass function of the faulty power unit.

[0034] Working process:

[0035] The normal operation controller 1 is in an active state, controls the high-voltage and high-power SVG device to operate, and the controller 2 is in a hot standby state and interacts with the active controller 1 and acquires signals; when the active controller 1 cannot continue to operate normally due to a hardware failure in the operation process, the active controller 1 sends a “control system redundancy automatic switching request” signal to the controller 2 in the hot standby state, the controller 2 in the hot standby state is automatically activated after receiving the “control system redundancy automatic switching request” signal from the active controller 1, and informs all power units of the high-voltage and high-power SVG device through the optical fiber connection; after confirming that all power units have received the activation signal of the controller 2, the newly activated controller 2 informs the controller 1 with a hardware failure that it is in the active state and makes it exit the active state and become a redundant standby state; then the newly activated controller 2 controls the high-voltage and high-power SVG device to continue to operate, so as to avoid the high-voltage and high-power SVG device from stopping and tripping due to the hardware failure of the control system; after the automatic switching of the redundant control system is completed, the control system provides an action alarm signal of the control system redundancy automatic switching to the outside, and the operation and maintenance personnel can convert the controller 1 with a failure to a maintenance state after receiving the action alarm signal, then completely power off the controller 1 with a failure, and replace or repair the failed device of the controller 1; since the controllers 1 and 2 are completely the same in structure and independent of each other, including an independent HMI man-machine interface system, the controllers 1 and 2 can both realize the functions of operation control, parameter setting and state display of the high-voltage and high-power SVG device, so that the power failure or maintenance process of one of the controllers 1 and 2 will not have any impact on the continuous operation of the high-voltage and high-power SVG device; after the maintenance of the failed control system is completed, the controller 1 with a failure is re-powered and restored to the hot standby state, and when the active control system next time has a hardware failure, the redundant control system can be automatically switched again.When the A-phase power unit 1 fails in normal operation, the device controller controls the bypass contactor of the power unit 1 to close, so that the faulty power unit 1 is bypassed, the remaining N-1 power units of the device A-phase, and the B-phase and C-phase still have N power units, and the device remains in a continuous operation state without shutdown; after a period of time, another unit of the A-phase fails again, the device controller controls the bypass contactor of the faulty unit to close, so that the faulty unit is bypassed, the remaining N-2 power units of the device A-phase, and the B-phase and C-phase still have N power units, and the device remains in a continuous operation state without shutdown; after a period of time, the Mth unit of the device fails, the device controller controls the bypass contactor of the Mth faulty unit to close, so that the faulty power unit is bypassed, the remaining N-M power units of the device A-phase, and the B-phase and C-phase still have N power units, and the device remains in a continuous operation state without shutdown; if subsequent A-phase power units fail, since the A-phase bypass power units have reached M, the device cannot continue to bypass the faulty units, and the device will trip and shut down.

Claims

1. A redundant high-voltage high-power SVG device, said SVG device being composed of three paths of N power units connected in series, corresponding to the three phases A, B, C of the power grid, using a star or delta structure, characterized in that, The bypass unit, the control unit and the sampling unit are also included, the number of bypass units per phase is M, N>M, and the power unit of each phase is connected with the bypass unit correspondingly; The control unit includes control unit one and control unit two, and the control unit one and the control unit two are redundant to each other, and the three-way N SVG power units are connected with the control unit one and the control unit two by optical fibers; The sampling unit includes current sampling unit one and current sampling unit two, and the current sampling unit one and the current sampling unit two are arranged on the grid side of the power unit, the current sampling unit one is connected with the control unit one, and the current sampling unit two is connected with the control unit two.

2. A redundant high voltage high power SVG device according to claim 1, characterized in that, The power unit is a chain SVG, and the chain SVG includes a connecting piece and at least two H-bridge inverter units, and the at least two H-bridge inverter units are connected in series through the connecting piece.

3. A redundant high voltage high power SVG device according to claim 2, characterized in that, Each H-bridge inverter unit includes a unit control board and an IGBT drive board, the unit control board is connected with the IGBT drive board through a port, the IGBT drive board is connected with the corresponding power unit, and the unit control board is connected with the control unit one and the control unit two by optical fibers; and the unit control board includes a CPLD chip.

4. A redundant high voltage high power SVG device according to claim 3, characterized in that, The unit control board is connected with the DC capacitor of the power unit, and is used for obtaining a DC voltage sampling value.

5. The redundant high voltage high power SVG device of claim 1 wherein, The current sampling unit one and the current sampling unit two are current Hall sensors.

6. The redundant high voltage high power SVG device of claim 1 wherein, The bypass unit includes a bypass contactor, and the bypass contactor is connected with the H-bridge inverter unit.

7. The redundant high voltage high power SVG device of claim 1 wherein, The control unit one and the control unit two each include a controller, the main control chip of each controller includes a DSP and a FPGA, the chip of the DSP is ADI-21489, the chip of the FPGA is Altera-5CEFA7, and the single-board controller integrates the functions of a CPU board, an analog quantity board, a digital quantity board and a PWM board.

8. A redundant high voltage high power SVG device according to claim 7, characterized in that, The control unit one is arranged in a control cabinet one, and the control unit two is arranged in a control cabinet two.

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