A redundant control system for ultra-high power static VAR compensation device

Abstract

The present invention discloses a redundant control system for an ultra-high-power static VAR compensation device, comprising: a primary control chassis, configured to send control data to a phased control chassis in an active operating state, and simultaneously send redundant backup data to a backup control chassis. When a fault occurs, the primary control chassis switches to the new backup control chassis according to a preset state switching principle, while simultaneously sending redundant status data to the backup control chassis. The primary control chassis then switches to the new backup control chassis according to a preset control chassis switching principle. The backup control chassis, when the primary control chassis is in an active operating state, receives the redundant backup data and redundant status data, determines the primary control chassis fault condition based on the redundant status data, and switches the current operating state based on the fault condition and the preset control chassis switching principle. The phased control chassis acquires control data and controls converter triggering based on the control data. This invention effectively improves the stability of the SVG control network.

Description

Technical Field

[0001] The present invention relates to the technical field of reactive power compensation, and more particularly to a redundant control system for an ultra-high power static reactive power compensation device. Background Art

[0002] SVG (Static Var Generator), also known as a static synchronous compensator, is a device that uses a self-commutated power semiconductor bridge converter to provide dynamic reactive power compensation. With the increasing number of nonlinear loads such as modern power electronic equipment connected to the power grid, the quality of power supply has been severely impacted. Improving power quality, preventing grid contamination from connected equipment, and ensuring normal equipment operation have become fundamental requirements for new energy stations, large industrial and mining enterprises, and SVG is one of the best solutions to address these needs.

[0003] SVG devices utilize high-power, turn-off IGBTs as switching devices, effectively connecting an adjustable reactive current source in parallel to the grid. The reactive current output can rapidly track changes in the load's reactive current, automatically compensating for the system's required reactive power. Compared to traditional phase-shifting devices, capacitor-reactor systems, and SVCs primarily based on thyristor control, SVG reactive compensation devices offer significant advantages, including a smaller footprint, faster adjustment speed, and active tracking compensation. They can effectively improve power factor, suppress voltage fluctuations, reduce flicker, improve three-phase voltage imbalance, and effectively suppress harmonics in the grid.

[0004] SVGs operate under a wide range of conditions, especially when coordinating multiple units. Reactive power calculation and distribution presents a significant challenge. Traditionally, a single SVG is designated as the master SVG, and reactive power calculation and distribution is performed through the master SVG and AVC. However, a failure of the master SVG can cause failure in the coordinated control network comprised of multiple SVGs, degrading overall network stability.

[0005] Therefore, how to provide a redundant control system for an ultra-high power static VAR compensation device is a problem that those skilled in the art urgently need to solve. Summary of the Invention

[0006] In view of this, the present invention provides a redundant control system for an ultra-high power static VAR compensation device, which aims to solve the problem of overall network instability in the operation of multiple SVGs in the prior art.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A redundant control system for an ultra-high power static VAR compensation device, comprising: a main control chassis, a backup control chassis, and a phase-controlled chassis; wherein the main control chassis is connected to the backup control chassis, and the main control chassis and the backup control chassis are both connected to the phase-controlled chassis;

[0009] The active control chassis is used to send control data to the phased control chassis in the active operation state and send redundant backup data to the standby control chassis. When a failure occurs, the active control chassis switches to the current operation state according to the preset state switching principle and sends redundant state data to the standby control chassis. The current active control chassis switches to the new standby control chassis according to the preset control chassis switching principle.

[0010] The standby control chassis is configured to receive the redundant backup data and the redundant status data when the primary control chassis is in an active operation state, and determine a fault condition of the primary control chassis based on the redundant status data, and switch the current operation state based on the fault condition and a preset control chassis switching principle;

[0011] The phase-controlled chassis is used to obtain the control data and control the inverter triggering according to the control data.

[0012] Preferably, when the number of three-phase modules is less than 144, the phase-controlled chassis includes one;

[0013] The main control chassis and the standby control chassis both include Gigabit port 2, Gigabit port 6, Gigabit port 5 and Gigabit port 3, and the phased control chassis includes phased Gigabit port 5, phased Gigabit port 6, phased Gigabit port 3 and phased Gigabit port 4;

[0014] The Gigabit port 2 in the main control chassis is connected to the Gigabit port 2 of the standby control chassis for transmitting the redundant backup data. The Gigabit port 6 in the main control chassis is connected to the Gigabit port 6 of the standby control chassis for transmitting redundant status data. The Gigabit port 5 in the main control chassis is connected to the phase-controlled Gigabit port 5, and the Gigabit port 5 of the standby control chassis is connected to the phase-controlled Gigabit port 6, both of which are used to transmit modulated wave data. The Gigabit port 3 in the main control chassis is connected to the phase-controlled Gigabit port 3, and the Gigabit port 3 in the standby control chassis is connected to the phase-controlled Gigabit port 4, both of which are used to transmit recorded wave data.

[0015] Preferably, when the number of three-phase modules is greater than 144, the phase-controlled chassis includes two, namely phase-controlled chassis 1 and phase-controlled chassis 2;

[0016] The main control chassis and the standby control chassis both include Gigabit port 2, Gigabit port 6, and Gigabit port 5; the phase control chassis 1 includes phase control 1 Gigabit port 5, phase control 1 Gigabit port 6, and phase control 1 Gigabit port 3; the phase control chassis 2 includes phase control 2 Gigabit port 3;

[0017] The Gigabit port 2 in the main control chassis is connected to the Gigabit port 2 of the standby control chassis for transmitting the redundant backup data, the Gigabit port 6 in the main control chassis is connected to the Gigabit port 6 of the standby control chassis for transmitting redundant status data, the Gigabit port 5 in the main control chassis is connected to the Gigabit port 5 of the phase-controlled 1, and the Gigabit port 5 of the standby control chassis is connected to the Gigabit port 6 of the phase-controlled 1, both of which are used to transmit modulated wave data, the Gigabit port 3 of the phase-controlled 1 is connected to the Gigabit port 3 of the phase-controlled 2, for transmitting modulated wave data.

[0018] Preferably, the main control chassis and the standby control chassis both include a status reading unit and a status switching unit;

[0019] The state reading unit is used to obtain the current working state, which includes the exit state, test state, hot standby state and active state;

[0020] The state switching unit is used to obtain the current working state and switch the working state according to a preset state switching principle.

[0021] Preferably, the state switching principle includes:

[0022] After the active control chassis and the standby control chassis are started and initialized, the active control chassis and the standby control chassis automatically switch to the exit state;

[0023] Switch from exit state to test state: In exit state, if the main control chassis sends a test command, it switches to test state;

[0024] Switch from test state to exit state: In test state, if the main control chassis issues an exit command, it switches to exit state;

[0025] Switch from exit state to hot standby state: In exit state, if the ready command signal is set, and the hot standby state signal is not reset, and the hot standby switching prohibition command is not issued, the state switches to hot standby state;

[0026] Switch from hot standby state to exit state: In hot standby state, if there is a reset hot standby state signal, it switches to exit state;

[0027] Switching from hot standby to active state: In hot standby state, if any of the following conditions are met, it will automatically switch to active state;

[0028] (1) Communication failure between SVG slave interface devices and no reset active command is allowed;

[0029] (2) The standby control chassis is not in the active state and no reset active command is allowed;

[0030] (3) The system normal delay of the standby control chassis is 0, and no reset active command is allowed;

[0031] Switching from active state to hot standby state: In active state, if no shutdown command is received and permission to reset active and switch to hot standby state is received, and the standby control chassis is in active state, it will automatically switch to hot standby state;

[0032] Switch from active state to exit state: In active state, if any of the following conditions are met, it will automatically switch to exit state:

[0033] (1) Receive a shutdown command;

[0034] (2) The standby control chassis is in the active state and receives a reset active command, but is not in the hot standby state. The standby control chassis requests the active control chassis to switch to the exit state, the active control chassis fails, or the system normal delay of the active control chassis is 0.

[0035] Preferably, the active control chassis and the standby control chassis further include a fault detection unit and an active / standby control switching unit;

[0036] The fault detection unit is used to detect whether the main control chassis has a fault and send the current fault situation to the main and standby control switching unit; the fault types include minor faults, serious faults, emergency faults and downtime faults;

[0037] The master-slave control switching unit is used to obtain a fault condition and control the master-slave switching between the current master control chassis and the standby control chassis according to a preset control chassis switching principle.

[0038] Preferably, in the absence of a fault, the control chassis switching principle is:

[0039] If the active control chassis is currently in hot standby state and the standby control chassis is not in active state, the current active control chassis is automatically switched to active state;

[0040] If the current main control chassis needs to be exited from the active state, it is necessary to switch to the hot standby state in the active system, upgrade the current standby control chassis to the active state, and exit the current standby control chassis to the hot standby state.

[0041] Preferably, when a fault occurs in the current active control chassis, the control chassis switching principle is:

[0042] If the current active control chassis is in hot standby state, if the communication between the active and standby control chassis fails, it will automatically switch to the active state; if the current standby control chassis fails in receiving data, it is determined that the communication with the current active control chassis has failed, and the current standby control chassis will automatically switch to the active control chassis, and at the same time request the original active control chassis to be downgraded to the new standby control chassis;

[0043] If the current active control chassis has an emergency fault in the active state, the current standby control chassis will be ordered to switch to the active state, and the current active control chassis will be switched to the exit state; if the current active control chassis has an emergency fault, the system normal signal will no longer be set, and the current standby control chassis will automatically switch to the new active control chassis. After completion, the original active control chassis will switch to the exit state;

[0044] If the current active control chassis has a serious fault in the active state and the current standby control chassis has no serious fault, the current standby control chassis will be ordered to upgrade to the active state and the current active control chassis will return to the hot standby state;

[0045] If the current active control chassis has a minor fault in the active state and the standby system is fault-free, after a preset time interval, the current standby control chassis is commanded to upgrade to the active state, and the current active control chassis exits to the hot standby state;

[0046] If the active control chassis fails in the active state, the active control chassis will be downgraded to the exit state and the standby control chassis will be switched to the active state.

[0047] If the current standby control chassis has an emergency failure in the hot standby state, the current active control chassis will be reduced to the exit state;

[0048] If a serious fault occurs in the hot standby state on the current standby control chassis, no switchover will be performed between the current active control chassis and the current standby control chassis;

[0049] If a minor fault occurs in the hot standby state on the current standby control chassis, no switchover will be performed between the current active control chassis and the current standby control chassis;

[0050] If the current standby control chassis fails in the hot standby state, the current active control chassis drops to the exit state.

[0051] Preferably, when the fault occurs only in the current standby control chassis, the control chassis switching principle is:

[0052] In the event of a minor or major fault, the active control chassis remains in active operation, and the standby control chassis remains in standby operation;

[0053] In the event of an emergency failure or system downtime, the active control chassis remains in active operation and the standby control chassis is dropped to the exited state.

[0054] Through the above technical solution, it can be seen that compared with the prior art, the present invention discloses a redundant control system for an ultra-high power static VAR compensation device, which includes a main control chassis and a backup control chassis. When the main control chassis is working, data is shared with the backup control chassis in real time to ensure the integrity of the data. Once the main control chassis fails, the switching between the main chassis and the backup chassis can be completed according to the failure situation. The backup chassis replaces the main control chassis that cannot work due to the failure problem, thereby maintaining the normal operation of the system, reducing the loss caused by the shutdown of the control equipment due to accidents, effectively improving the stability of the system, and solving the problems existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0056] Figure 1 A schematic structural diagram of a redundant control system for an ultra-high power static VAR compensation device when the number of three-phase modules provided by the present invention is less than 144;

[0057] Figure 2 A schematic structural diagram of a redundant control system for an ultra-high power static VAR compensation device when the number of three-phase modules provided by the present invention is greater than 144;

[0058] Figure 3 A schematic diagram of state switching during the control process of a redundant control system of an ultra-high power static VAR compensation device provided by the present invention. DETAILED DESCRIPTION

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0060] An embodiment of the present invention discloses a redundant control system for an ultra-high power static VAR compensation device, comprising: a main control chassis, a backup control chassis, and a phase-controlled chassis; wherein the main control chassis is connected to the backup control chassis, and the main control chassis and the backup control chassis are both connected to the phase-controlled chassis;

[0061] The main control chassis is used to send control data to the phased control chassis in the active operation state, and send redundant backup data to the standby control chassis. When a failure occurs, the current operation state is switched according to the preset state switching principle, and the redundant state data is sent to the standby control chassis. The current main control chassis is switched to the new standby control chassis according to the preset control chassis switching principle;

[0062] The standby control chassis is used to receive redundant backup data and redundant status data when the main control chassis is in the active operation state, and to determine the fault condition of the main control chassis based on the redundant status data, and to switch the current operation state based on the fault condition and the preset control chassis switching principle;

[0063] The phase-controlled chassis is used to obtain control data and control the inverter triggering according to the control data.

[0064] In order to further implement the above technical solutions, Figure 1 As shown, when the number of three-phase modules is less than 144, the phase control chassis includes 1;

[0065] Both the active and standby control chassis include Gigabit ports 2, 6, 5, and 3. The phased control chassis includes Gigabit ports 5, 6, 3, and 4.

[0066] Gigabit port 2 in the main control chassis is connected to Gigabit port 2 of the standby control chassis for transmitting redundant backup data. Gigabit port 6 in the main control chassis is connected to Gigabit port 6 of the standby control chassis for transmitting redundant status data. Gigabit port 5 in the main control chassis is connected to phase-controlled Gigabit port 5, and Gigabit port 5 of the standby control chassis is connected to phase-controlled Gigabit port 6, both of which are used to transmit modulated wave data. Gigabit port 3 in the main control chassis is connected to phase-controlled Gigabit port 3, and Gigabit port 3 in the standby control chassis is connected to phase-controlled Gigabit port 4, both of which are used to transmit recorded wave data.

[0067] It should be noted that:

[0068] Redundant mode is used in sites with special requirements. The redundant control system can complete the switching between the main and backup control systems, improving the stability of the device. In redundant mode, three control chassis are required: the main control chassis, the backup control chassis, and the phase-controlled control chassis. The FPGA2 in the main control chassis no longer manages unit voltage equalization control and unit communication, and the corresponding functions are moved down to the phase-controlled FPGA2. At the same time, neither the main control chassis nor the backup control chassis are equipped with fiber optic plug-ins. In normal operating mode, the phase-controlled control system receives the control data of the main control A, while the main control system B receives the redundant data of the main control system A through Gigabit port 2. When the main control system A fails, the control system will switch between the main and backup. A is downgraded to the backup, B is promoted to the main, and the phase-controlled control system receives the control data of the main control B.

[0069] During operation, data is constantly being transmitted. When a fault occurs, the data during the fault period is saved and converted into a recording; or transient recording can be manually triggered.

[0070] In order to further implement the above technical solutions, Figure 2 As shown, when the number of three-phase modules is greater than 144, the phase-controlled chassis includes two, namely phase-controlled chassis 1 and phase-controlled chassis 2;

[0071] Both the active and standby control chassis include Gigabit port 2, Gigabit port 6, and Gigabit port 5. Phase control chassis 1 includes Gigabit port 5, Gigabit port 6, and Gigabit port 3 of phase control 1. Phase control chassis 2 includes Gigabit port 3 of phase control 2.

[0072] Gigabit port 2 in the main control chassis is connected to Gigabit port 2 of the standby control chassis for transmitting redundant backup data. Gigabit port 6 in the main control chassis is connected to Gigabit port 6 of the standby control chassis for transmitting redundant status data. Gigabit port 5 in the main control chassis is connected to Gigabit port 5 of phase control 1, and Gigabit port 5 of the standby control chassis is connected to Gigabit port 6 of phase control 1, both of which are used to transmit modulated wave data. Gigabit port 3 of phase control 1 is connected to Gigabit port 3 of phase control 2 for transmitting modulated wave data.

[0073] It should be noted that:

[0074] For redundant mode with more than 144 unit modules, the master control chassis needs to exchange data with two sets of phased control chassis. Considering the current fiber port configuration, such as Figure 2 The phase control chassis no longer functions as a unit voltage equalizing ring, but only performs the unit pulse distribution function.

[0075] Function of phase-controlled chassis 2: When the number of three-phase modules exceeds 144 chains, one phase-controlled chassis only supports the connection of 144 power unit modules. When more power is required on site, the number of power unit modules must be increased, which requires a second phase-controlled chassis. In this case, phase-controlled chassis 1 acts as a transfer chassis, forwarding other modulated wave data exceeding 144 chains to phase-controlled chassis 2.

[0076] In order to further implement the above technical solution, both the main control chassis and the standby control chassis include a status reading unit and a status switching unit;

[0077] A status reading unit is used to obtain the current working status, which includes the exit status, test status, hot standby status and active status;

[0078] The state switching unit is used to obtain the current working state and switch the working state according to the preset state switching principle.

[0079] To further implement the above technical solution, the state switching principles include:

[0080] After the main control chassis and the standby control chassis are started and initialized, the main control chassis and the standby control chassis automatically switch to the exit state;

[0081] Switch from exit state to test state: In exit state, if the main control chassis sends a test command, it switches to test state;

[0082] Switch from test state to exit state: In test state, if the main control chassis issues an exit command, it switches to exit state;

[0083] Switch from exit state to hot standby state: In exit state, if the ready command signal is set, and the hot standby state signal is not reset, and the hot standby switching prohibition command is not issued, the state switches to hot standby state;

[0084] Switch from hot standby state to exit state: In hot standby state, if there is a reset hot standby state signal, it switches to exit state;

[0085] Switching from hot standby to active state: In hot standby state, if any of the following conditions are met, it will automatically switch to active state;

[0086] (1) Communication failure between SVG slave interface devices and no reset active command is allowed;

[0087] (2) The standby control chassis is not in the active state and no reset active command is allowed;

[0088] (3) The system normal delay of the standby control chassis is 0, and no reset active command is allowed;

[0089] Switching from active state to hot standby state: In active state, if no shutdown command is received and permission to reset active and switch to hot standby state is received, and the standby control chassis is in active state, it will automatically switch to hot standby state;

[0090] Switch from active state to exit state: In active state, if any of the following conditions are met, it will automatically switch to exit state:

[0091] (1) Receive a shutdown command;

[0092] (2) The standby control chassis is in the active state and receives a reset active command, but is not in the hot standby state. The standby control chassis requests the active control chassis to switch to the exit state, the active control chassis fails, or the system normal delay of the active control chassis is 0.

[0093] In order to further implement the above technical solution, the main control chassis and the backup control chassis also include a fault detection unit and a main-backup control switching unit;

[0094] The fault detection unit is used to detect whether the main control chassis has a fault and send the current fault status to the main and standby control switching units; the fault types include minor faults, serious faults, emergency faults and downtime faults;

[0095] The master-slave control switching unit is used to obtain fault conditions and control the master-slave switching between the current master control chassis and the standby control chassis according to the preset control chassis switching principle.

[0096] It should be noted that:

[0097] In redundant mode, each SVG is equipped with two coordinating controllers. Both the master and backup coordinating controllers simultaneously send control and status data to the SVG. The slave SVG selects data based on the master / slave status sent by the coordinating controller. The slave SVG handles the logical error prevention of dual master or backup during master / slave switching. The slave SVG determines whether the master becomes master later.

[0098] The redundant control system can be divided into four operating states, namely test (TEST), exit (OFF), hot standby (STANDBY) and active (ACTIVE); in the OFF state, the control system works normally and samples, but all exports are prohibited; in the STANDBY state, important data is updated synchronously in real time from the control chassis in the active state, and the conditions for switching to the active state at any time are met; the dual redundant control system normally operates in a state of one master and one hot standby; in the test state, a self-test is performed. The main system is used to control the triggering of the converter, and the standby system remains in operation, but its exports are prohibited. If an abnormality occurs in the main system, the standby main system switches to the new main system, and the faulty system (the original main system) must be checked before it is put back into operation. In this embodiment:

[0099] Data Channel: The control device switching logic is implemented in the SVG's DSP. The switching communication channel between the A and B suites is the CPU plug-in's TX5 / RX5. Dual-channel data redundancy is considered. In redundant mode, up to four coordinated slaves are supported.

[0100] State switching principle: During steady-state operation, only one of the A and B sets is allowed to be in the Active state. At the moment of switching, both are allowed to be Active, or both are allowed to be OFF, and the duration of this situation shall not exceed 5ms.

[0101] To further implement the above technical solution, in the absence of a fault, the control chassis switching principle is as follows:

[0102] If the active control chassis is currently in hot standby state and the standby control chassis is not in active state, the current active control chassis will be automatically switched to active state;

[0103] If you need to exit the current active control chassis from the active state, you need to Set_STBY in the Active system, and the current standby control chassis will be upgraded to the active state, and the current standby control chassis will exit to the hot standby state.

[0104] To further implement the above technical solution, when a fault occurs in the current active control chassis, the control chassis switching principle is as follows:

[0105] If the current active control chassis is in hot standby state, if the communication between the active and standby control chassis fails, it will automatically switch to the active state; if the current standby control chassis fails in receiving data, it is determined that the communication with the current active control chassis has failed, and the current standby control chassis will automatically switch to the active control chassis, and at the same time request the original active control chassis to be downgraded to the new standby control chassis;

[0106] If the current active control chassis has an emergency fault in the active state, the current standby control chassis will be ordered to switch to the active state, and the current active control chassis will be switched to the exit state; if the current active control chassis has an emergency fault, the system normal signal will no longer be set, and the current standby control chassis will automatically switch to the new active control chassis. After completion, the original active control chassis will switch to the exit state;

[0107] If the current active control chassis has a serious fault in the active state and the current standby control chassis has no serious fault, the current standby control chassis will be ordered to upgrade to the active state and the current active control chassis will return to the hot standby state;

[0108] If the current active control chassis has a minor fault in the active state and the standby system is fault-free, after a preset time interval, the current standby control chassis is commanded to upgrade to the active state, and the current active control chassis exits to the hot standby state;

[0109] If the active control chassis fails in the active state, the active control chassis will be downgraded to the exit state and the standby control chassis will be switched to the active state.

[0110] If an emergency fault occurs in the hot standby state, the active control chassis will be deactivated.

[0111] If a serious fault occurs in the hot standby state, the active control chassis will not switch to the standby control chassis.

[0112] If a minor fault occurs in the hot standby state, the active control chassis will not switch to the standby control chassis.

[0113] If the current active control chassis fails in the hot standby state, the current active control chassis drops to the exit state.

[0114] To further implement the above technical solution, when the fault only occurs in the current standby control chassis, the control chassis switching principle is as follows:

[0115] In the event of a minor or major fault, the active control chassis remains in active operation, and the standby control chassis remains in standby operation;

[0116] In the event of an emergency failure or system downtime, the active control chassis remains in active operation and the standby control chassis is dropped to the exited state.

[0117] It should be noted that:

[0118] State switching transition diagram Figure 3 shown.

[0119] The redundancy switchover process is based on the fault level of the active control chassis. Faults that occur during the operation of the active control chassis require a detailed classification of fault levels. Different fault levels produce different switchover outcomes. Faults are categorized into four levels based on their impact on system control: Minor Fault (MF), Severe Fault (SF), Emergency Fault (EF), and Stall. When a system fault of different levels occurs, the switchover mechanism described in the previous section is used to ensure the healthiest system remains operational.

[0120] When operating in a master-slave mode (with machine A as the master control chassis and machine B as the backup control chassis), the switching logic when a system fails is shown in Table 1:

[0121] Table 1

[0122]

[0123] The switching operation is shown in Table 2-3:

[0124] Machine A operation:

[0125] Table 2

[0126]

[0127]

[0128] Machine B operation:

[0129] Table 3

[0130]

[0131] In the above table, SYS_OK indicates a normal system signal.

[0132] When one of the control systems A and B is in active state and the other is in shutdown or maintenance state, that is, only one is running, the switching logic when the control host fails is shown in Table 4:

[0133] Table 4

[0134]

[0135] Compared with the prior art, the present invention:

[0136] (1) In ultra-high voltage power grid systems, the demand for 100-megawatt SVG devices is gradually emerging to enhance grid voltage control and stabilization capabilities. The controller redundancy control strategy proposed in this invention is suitable for ultra-high power SVG applications with more than 48 chains (more than 144 modules), and can effectively improve the stability and safety of the device.

[0137] (2) The redundant control system proposed in the present invention includes a redundant design controller and a redundant control algorithm. The redundant controller design improves reliability by adding hardware redundancy devices. The redundant design algorithm ensures synchronization of core control data between devices and automatically switches to a backup device when a host fails.

[0138] (3) The master-slave controller configuration proposed in the present invention ensures that if any one controller fails, the remaining control devices can still perform all control functions. A redundant control algorithm is used to achieve smooth transition switching of the system, ensuring the stable operation of the SVG device.

[0139] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0140] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A redundant control system for an ultra-high power static VAR compensation device, characterized in that: include: A main control chassis, a standby control chassis and a phase-controlled chassis; wherein the main control chassis is connected to the standby control chassis, and the main control chassis and the standby control chassis are both connected to the phase-controlled chassis; The active control chassis is used to send control data to the phased control chassis in the active operation state and send redundant backup data to the standby control chassis. When a failure occurs, the active control chassis switches to the current operation state according to the preset state switching principle and sends redundant state data to the standby control chassis. The current active control chassis switches to the new standby control chassis according to the preset control chassis switching principle. The standby control chassis is configured to receive the redundant backup data and the redundant status data when the primary control chassis is in an active operation state, and determine a fault condition of the primary control chassis based on the redundant status data, and switch the current operation state based on the fault condition and a preset control chassis switching principle; The phase-controlled chassis is used to obtain the control data and control the inverter triggering according to the control data; The main control chassis and the backup control chassis also include a fault detection unit and a main and backup control switching unit; The fault detection unit is used to detect whether the main control chassis has a fault and send the current fault situation to the main and standby control switching unit; the fault types include minor faults, serious faults, emergency faults and downtime faults; The master-slave control switching unit is used to obtain the fault situation and control the master-slave switching between the current master control chassis and the backup control chassis according to the preset control chassis switching principle; If a fault occurs in the active control chassis, the control chassis switching principle is as follows: If the current active control chassis is in hot standby state, if the communication between the active and standby control chassis fails, it will automatically switch to the active state; if the current standby control chassis fails in receiving data, it is determined that the communication with the current active control chassis has failed, and the current standby control chassis will automatically switch to the active control chassis, and at the same time request the original active control chassis to be downgraded to the new standby control chassis; If the current active control chassis has an emergency fault in the active state, the current standby control chassis will be ordered to switch to the active state, and the current active control chassis will be switched to the exit state; if the current active control chassis has an emergency fault, the system normal signal will no longer be set, and the current standby control chassis will automatically switch to the new active control chassis. After completion, the original active control chassis will switch to the exit state; If the current active control chassis has a serious fault in the active state and the current standby control chassis has no serious fault, the current standby control chassis will be ordered to upgrade to the active state and the current active control chassis will return to the hot standby state; If the current active control chassis has a minor fault in the active state and the standby system is fault-free, after a preset time interval, the current standby control chassis is commanded to upgrade to the active state, and the current active control chassis exits to the hot standby state; If the active control chassis fails in the active state, the active control chassis will be downgraded to the exit state and the standby control chassis will be switched to the active state. If the current standby control chassis has an emergency failure in the hot standby state, the current active control chassis will be reduced to the exit state; If a serious fault occurs in the hot standby state on the current standby control chassis, no switchover will be performed between the current active control chassis and the current standby control chassis; If a minor fault occurs in the hot standby state on the current standby control chassis, no switchover will be performed between the current active control chassis and the current standby control chassis; If the current standby control chassis fails in the hot standby state, the current active control chassis drops to the exit state.

2. The redundant control system of a super-high power static VAR compensation device according to claim 1, characterized in that: When the number of three-phase modules is less than 144, the phase-controlled chassis includes 1; The main control chassis and the standby control chassis both include Gigabit port 2, Gigabit port 6, Gigabit port 5 and Gigabit port 3, and the phased control chassis includes phased Gigabit port 5, phased Gigabit port 6, phased Gigabit port 3 and phased Gigabit port 4; The Gigabit port 2 in the main control chassis is connected to the Gigabit port 2 of the standby control chassis for transmitting the redundant backup data. The Gigabit port 6 in the main control chassis is connected to the Gigabit port 6 of the standby control chassis for transmitting redundant status data. The Gigabit port 5 in the main control chassis is connected to the phase-controlled Gigabit port 5, and the Gigabit port 5 of the standby control chassis is connected to the phase-controlled Gigabit port 6, both of which are used to transmit modulated wave data. The Gigabit port 3 in the main control chassis is connected to the phase-controlled Gigabit port 3, and the Gigabit port 3 in the standby control chassis is connected to the phase-controlled Gigabit port 4, both of which are used to transmit recorded wave data.

3. The redundant control system of a super-high power static VAR compensation device according to claim 1, characterized in that: When the number of three-phase modules is greater than 144, the phase-controlled chassis includes two, namely phase-controlled chassis 1 and phase-controlled chassis 2; The main control chassis and the standby control chassis both include Gigabit port 2, Gigabit port 6, and Gigabit port 5; the phase control chassis 1 includes phase control 1 Gigabit port 5, phase control 1 Gigabit port 6, and phase control 1 Gigabit port 3; the phase control chassis 2 includes phase control 2 Gigabit port 3; The Gigabit port 2 in the main control chassis is connected to the Gigabit port 2 of the standby control chassis for transmitting the redundant backup data, the Gigabit port 6 in the main control chassis is connected to the Gigabit port 6 of the standby control chassis for transmitting redundant status data, the Gigabit port 5 in the main control chassis is connected to the Gigabit port 5 of the phase-controlled 1, and the Gigabit port 5 of the standby control chassis is connected to the Gigabit port 6 of the phase-controlled 1, both of which are used to transmit modulated wave data, the Gigabit port 3 of the phase-controlled 1 is connected to the Gigabit port 3 of the phase-controlled 2, for transmitting modulated wave data.

4. The redundant control system of a super-high power static VAR compensation device according to claim 1, characterized in that: The main control chassis and the standby control chassis both include a status reading unit and a status switching unit; The state reading unit is used to obtain the current working state, which includes the exit state, test state, hot standby state and active state; The state switching unit is used to obtain the current working state and switch the working state according to a preset state switching principle.

5. The redundant control system of a super-high power static VAR compensation device according to claim 4, characterized in that: The state switching principles include: After the active control chassis and the standby control chassis are started and initialized, the active control chassis and the standby control chassis automatically switch to the exit state; Switch from exit state to test state: In exit state, if the main control chassis sends a test command, it switches to test state; Switch from test state to exit state: In test state, if the main control chassis issues an exit command, it switches to exit state; Switch from exit state to hot standby state: In exit state, if the ready command signal is set, and the hot standby state signal is not reset, and the hot standby switching prohibition command is not issued, the state switches to hot standby state; Switch from hot standby state to exit state: In hot standby state, if there is a reset hot standby state signal, it switches to exit state; Switching from hot standby to active state: In hot standby state, if any of the following conditions are met, it will automatically switch to active state; (1) Communication failure between SVG slave interface devices and no reset active command is allowed; (2) The standby control chassis is not in the active state and no reset active command is allowed; (3) The system normal delay of the standby control chassis is 0, and no reset active command is allowed; Switching from active state to hot standby state: In active state, if no shutdown command is received and a command to reset active state and switch to hot standby state is received, and the standby control chassis is in active state, it will automatically switch to hot standby state; Switch from active state to exit state: In active state, if any of the following conditions are met, it will automatically switch to exit state: (1) Receive a shutdown command; (2) The standby control chassis is in the active state and receives a reset active command, but does not have a hot standby state switch command. The standby control chassis requests the active control chassis to switch to the exit state, the active control chassis fails, or the active control chassis's system normal delay is 0.

6. The redundant control system of a super-high power static VAR compensation device according to claim 1, characterized in that: In the absence of a fault, the control chassis switching principle is as follows: If the active control chassis is currently in hot standby state and the standby control chassis is not in active state, the current active control chassis is automatically switched to active state; If the current main control chassis needs to be exited from the active state, it is necessary to switch to the hot standby state in the active system, upgrade the current standby control chassis to the active state, and exit the current standby control chassis to the hot standby state.

7. The redundant control system of a super-high power static VAR compensation device according to claim 1, characterized in that: When the fault occurs only in the current standby control chassis, the control chassis switching principle is as follows: In the event of a minor or major fault, the active control chassis remains in active operation, and the standby control chassis remains in standby operation; In the event of an emergency failure or system downtime, the active control chassis remains in active operation and the standby control chassis is dropped to the exited state.

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