KR100665379B1 - Training-Purpose HVDC Controller for Power System Engineers and operating method thereof - Google Patents

Abstract

The present invention provides an HVDC for training to provide an analysis and training method for any system operation or various assumed scenarios to improve the operational capability of the crisis operator in addition to more accurate analysis of the AC system including the DC system. A control system and a method of operating the same, the training HVDC control system comprising: a digital simulator for measuring voltage and current values of AC and DC systems; A current amplifier for amplifying the current value measured by the digital simulator; A voltage amplifier amplifying the voltage value measured by the digital simulator; And an HVDC controller that notifies the operating state of the DC power transmission system in response to an operation signal arbitrarily manipulated by the power system operator, and enables the DC power transmission system to operate in a preset scenario so that the learner can grasp the operation state of the DC power transmission system. Characterized in that the configuration.

Training HVDC Control System, Simulator, System Analysis, Haenam-Jeju HVDC

Description

Training-Purpose HVDC Controller for Power System Engineers and operating method

1 is a block diagram for explaining the configuration of the present invention training HVDC control system;

2 is a configuration diagram of the HVDC controller connection.

3 is an HVDC controller panel configuration diagram.

4 is an input / output signal flow diagram.

5 is a flow chart of the system configuration and training of the present invention.

6 is a diagram showing a simulation result output screen.

*** Explanation of symbols for main parts of drawing ***

100: digital simulator 200: HVDC controller

300: current amplifier 400: voltage amplifier

The present invention relates to a training HVDC control system and its operation method.

In particular, HVDC control for training to provide more accurate interpretation of AC system including DC system, and to provide analysis and training methods for any system operation or various assumed scenarios to improve the operational ability of crisis operators in response to crisis. It relates to a system and a method of operating the same.

In October 1997, Haenam-Jeju DC system linkage operation was started for the first time in Korea.

Unlike the AC system, the operation of the Haenam-Jeju DC transmission system is the first attempt system in Korea, and the DC system is a very different technology from the AC system in terms of equipment and operation control. On the other hand, it is an advanced power control system composed of advanced control protection system.

However, due to lack of domestic DC transmission experience and weak technical support system, frequent power failure of DC system including power outage in Jeju Island is occurring.

Therefore, it is urgent to secure the operation, protection and control technology of the DC transmission facility considering the unique characteristics of the Jeju Island system.

In general, the analysis of AC system including DC system is limited using the general-purpose HVDC model of PSS / E, which is a non-real-time S / W widely used as a domestic system analysis tool. Has an impossible disadvantage.

In addition, since the simulation results simulated using the PSS / E non-real-time system analysis program are not models that reflect the limitation of the simulation scale and the control characteristics of Haenam-Jeju, such system analysis / analysis must be performed locally. have.

For this reason, the operator's education / training on the control and protection coordination of the AC-DC linkage system is necessary for rational operation.

The present invention has been made to solve the problems of the prior art as described above, the object of the present invention is to provide a more accurate interpretation of the AC system including the DC system and the same as the actual system to improve the crisis management operation ability of the system operator It is to provide a training HVDC control system and its operation method to provide a method of analysis and training for any system operation or various assumed scenarios.

In addition, another object of the present invention is to develop a training case for a power system operator and to develop an efficient and user-friendly environment thereof. To provide a control system and its operation method.

One embodiment of the present invention for achieving the above object, the training HVDC control system, Digital simulator for measuring the voltage and current value of the AC and DC system; A current amplifier for amplifying the current value measured by the digital simulator; A voltage amplifier amplifying the voltage value measured by the digital simulator; And an HVDC controller that notifies the operating state of the DC power transmission system in response to an operation signal arbitrarily manipulated by the power system operator, and enables the DC power transmission system to operate in a preset scenario so that the learner can grasp the operation state of the DC power transmission system. Characterized in that the configuration.

The HVDC controller may include: a measurement cubicle configured to adjust the measured voltage and current values to preset conditions; A pole protection unit configured to protect the converter in response to the regulated voltage and current signals; A pager controller in charge of generating a firing signal in response to the adjusted voltage and current signals and a voltage and current command value input from the outside; A pole controller for outputting a voltage and current command value to the pager controller in response to the adjusted voltage and current signals and power / frequency / current input values input from the outside; And a master controller configured to generate a power / frequency / current request value in response to a preset operation condition and a plurality of commands input from the outside, and to output the generated power / frequency / current request value to the pole controller. It is done.

The phaser control unit outputs a firing signal of a 12-pulse valve constituting one pole.

The pager control unit preferably generates a firing pulse by calculating the firing angle according to the command value of the voltage and current calculated by the pole control unit.

In addition, the present invention is characterized in that it further comprises a plurality of switches operated by the simulator to operate the entire system.

And a voltage command controller for generating a voltage bias of a DC line under the measurement cubicle, pole controller and master controller; A current balance unit for maintaining the current of the anode at the energetic frequency at the start of the anode operation or at the opening and closing of the neutral ground switch; An auxiliary loop controller configured to generate and output a loop disable and an alpha min signal; A frequency controller for maintaining an inverter system frequency at 60 Hz during constant frequency operation; A blocking control unit for controlling the firing sequence of the valve in the Block / DeBlock operation mode by an operator's operation or a protection system; An automatic tap change control unit for generating a tap control signal for maintaining the valve side AC voltage in a predetermined range; A pole control and command system comprising a power control unit for generating a current command value according to the DC power command value is added.

In addition, another embodiment of the present invention, in performing the training of the HVDC control system for the system operator, (a) creating an accident simulation draft; (b) allowing an accident simulation experiment to be started by the draft of the accident simulation draft when the accident simulation draft is created, and applying the accident simulation experiment to a pre-registered scenario when the accident simulation draft is not created; (c) calculating command values such as voltage and current by using the operation characteristics generated as the HVDC controller is operated; (d) setting an operation environment and an operation requirement of the HVDC controller using a control desk; (e) outputting and storing the simulation results.

Hereinafter, with reference to the accompanying drawings, the training instruction for the HVDC control system as follows.

1, a digital simulator 100 for measuring voltage and current values of AC and DC systems, a current amplifier 200 for amplifying the current value measured by the digital simulator 100, and Learner by informing the operation state of the DC power transmission system in response to an operation signal arbitrarily manipulated by the power amplifier and the voltage amplifier 300 to amplify the voltage value measured in the digital simulator while the DC power transmission system operates in a preset scenario. It is composed of a control desk 500 having a plurality of switches for operating the entire system is operated by the simulator and the HVDC controller 400 to enable the operation state of the DC power transmission system.

In addition, the HVDC controller 400 includes a measurement cubicle 410 that adjusts the measured voltage and current values to a preset condition as shown in FIG. 2 and a converter protection in response to the adjusted voltage and current signals. Pole protection unit 420, the pager control unit 430 responsible for generating a firing signal in response to the adjusted voltage and current signal, the voltage and current command value input from the outside, and the adjusted voltage and current signal, And a pole controller 440 for outputting a voltage and current command value to the pager controller 430 in response to a power / frequency / current request value input from the outside, and in response to a preset operating condition and a plurality of commands input from the outside. The master controller 450 generates a power / frequency / current request value and outputs the generated power / frequency / current request value to the pole controller 420.

The configuration is provided by the number of poles.

The pager control unit 430 outputs a firing signal of a 12-pulse valve forming one pole. The pager control unit 430 generates a firing pulse by calculating the firing angle according to the command value of the voltage and current calculated by the pole control unit.

In addition, under the measurement cubicle 410, the pole control unit 440, and the master control unit 450, a voltage command control unit 1 generating a voltage bias of the DC line as shown in FIG. 3, A current balance unit (2) for maintaining the current of the anode at the energetic frequency at the start of the anode operation or at the opening and closing of the neutral wire ground switch, and an auxiliary loop control unit (3) for generating and outputting a loop disable and an alpha min signal, A frequency controller 4 for maintaining the inverter system frequency at 60 Hz during constant frequency operation, a blocking controller 5 for controlling the firing sequence of the valve in the Block / DeBlock operation mode by an operator's operation or protection system, and the valve side An automatic tap change control unit 6 for generating a tap control signal for maintaining an AC voltage in a predetermined range, a power control unit 7 for generating a current command value according to the DC power command value, and A pole control and command system (PSSC) consisting of a current command control section 8 which generates a pole current command value using signals input from the current balance 2, the frequency control section 4 and the power control section 7 is added.

Referring to the operation method of the training HVDC control system configured as described above are as follows.

The method of operating the training training HVDC control system to which the present invention is applied first determines whether an accident simulation draft is prepared as shown in FIG. 5 (S100). When the draft of the accident simulation is made, the accident simulation is started by the draft of the accident simulation (S110), and when the draft of the accident simulation is not prepared, the accident simulation experiment is started by applying to a pre-registered scenario (S120). .

Then, using the operating characteristics generated by the operation of the HVDC controller 400 configures the analysis target system (S130), calculates and calculates the power / frequency / current value (S140), such as the final voltage and current The command value is calculated (S150).

In addition, the learner may use the control desk 500 to set an operation environment and an operation requirement of the HVDC controller 400 (S160). The operation of the HVDC controller 400 is controlled by the driving environment and the driving requirements set as described above, and when the operation is completed, the simulation result is output (see FIG. 6) and stored (S170).

The training HVDC control system has a variety of operating modes, including the situation of the AC system, the transmission capacity and transmission direction of the DC power, and the control mode of the converter.

Therefore, after the training HVDC control system is operated in various operating modes to operate the HVDC controller to perform the system analysis and training. For this purpose, HVDC controller in actual installation of Haenam-Jeju is analyzed closely (lower valve control part) and integrated into one controller using interconnection information of actual control signal.

In addition, the control characteristics of the training HVDC system is as follows.

The rectifier has a voltage and current control loop. In normal state (ABC curve), the voltage controller is selected and operates. In the transient state or AC side fault state (CC'EF curve), the current controller operates.

[table]

At this time, the selection of the current controller and the voltage controller is made by a maximum value selector which selects a large value by comparing the current control output value and the voltage control output value.

In addition, the inverter has a current control loop and a minimum γ controller loop. In the normal state (ABC curve), the current controller is selected and operated. In the transient state or the AC side fault state (CC'EF curve), the minimum γ controller operates.

At this time, the current controller selects the minimum γ controller by using a minimum value selector which selects a small value by comparing the current control output value with the minimum γ control output value.

The training HVDC control system consists of a bipolar structure consisting of four 12-pulse valve groups, two for each pole, and is designed to transmit power up to 300MW in both directions with a rated capacity of ± 180kV and 833A. It is.

The training HVDC control system includes a master control unit 450, a pole control unit 440 block, and a pager control unit 430 and a pole protection unit made of an analog type card unit as shown in FIG. 420 blocks and the like.

In addition, the learner sets the driving environment and driving requirements of the system in the control desk 500 shown in FIGS. 1 and 4 as shown in the following table.

table. Control Items in Control Desk

Control Items in Control Desk Driving preference Set driving requirement Power Direction Manual / Automatic Operation Mode Selection Control Mode Selection: System Start after Power / Frequency / Current Blackout                                                                                        Current Demand Current Change Demand (dI / dT Demand) Power Demand (Power Demand) Power Demand (dP / dT Demand) Frequency Demand Frequency Demand Frequency Slope Demand

      The master controller 450 is used for automatic operation control of the HVDC system, and there are two Master Control Cubicles (MCCs), one for each Pole, in each C / S. The master controller 450 controls the automatic operation such as start / stop and sequence control of the C / S and performs cooperative control by exchanging information with the MC of the counterpart C / S through a modem. In addition, by using the command of the control desk 500 and the output signal (current, voltage, power, and frequency) of the pole controller 440, the power / frequency / current request value according to the control mode is transmitted to the pole controller 440. .

     On the other hand, the PCCS (Pole Control & Command System) shown in FIG. 3 has a voltage command control unit 1 generating a voltage bias of a DC line, and an anode current at the energetic frequency at the start of the anode operation or at the opening and closing of the neutral ground switch. A current balance unit (2) for maintaining the same, an Auxiliary loop control unit (3) for generating and disabling loop disable and alpha signals, and a frequency control unit (4) for maintaining the inverter system frequency at 60 Hz during constant frequency operation; Blocking control unit 5 for controlling the firing sequence of the valve in the Block / DeBlock operation mode by the operator's operation or protection system, and automatic tap change for generating a tap control signal for maintaining the AC side of the valve in a certain range. Input from the control unit 6, a power control unit 7 for generating a current command value corresponding to the DC power command value, the current balance 2, the frequency control unit 4, and the power control unit 7; The current command control unit 8 generates a pole current setpoint using a signal, and reflects the operating characteristics of the training HVDC control system, and the power / frequency / current request value transmitted from the upper master control unit 450. Calculate command values such as voltage and current by using DC as reference value and frequency obtained from DC voltage and current signal adjusted to appropriate control signal level through measurement cubicle 410 and the frequency obtained from synchronous phase controller connected to Jeju busbar. do.

Although not shown in the drawing, the pole protection unit 420 may include an AC / DC current differential protection circuit (AC / DC differential), a converter protection circuit from a fundamental wave component of a DC voltage, and a converter from an abnormal firing / armor signal. It consists of Abnormal Firing Angle circuit, AC Over-Voltage, AC Over-Current, and DC OV & OC. The pole protection unit 420 determines the occurrence of the accident for the protection of the converter and performs a protection operation according to the degree of the accident.

The phaser control unit 430 may include an AC voltage measurement circuit, an arc signal phase limit circuit, a loop control circuit, an oscillator pulse generator circuit, and the like. And a firing pulse distribution circuit (Ring Counter), a firing signal equalization correction circuit (Alpha Balancing), and an arc extinguishing signal equalization correction circuit (GammaBalancing), and the pager control unit 430 is calculated by the pole control unit 440. A firing pulse is generated by calculating the appropriate firing angle α according to the voltage and current command values.

By changing the various settings as described above it is possible to change the operation of the training HVDC controller, the details of each training course to determine the training course to practice the overall operation of the HVDC system is determined as follows.

-Converter transformer tap control

Improved call signal function

-Internal / external accident of valve group

-Rectifier side current controller

-Inverter side gamma controller

-Pole trip accident by relay operation according to external power line accident

-Pole Trip accident due to operation of 154kV bus protection relay

The present invention enables the efficient operation training for any control of the system operator based on the real-time algorithm for the training on the simulation training that was limited by the non-real-time S / W based on the conventional knowledge of the existing system operator The fast and accurate coping ability of the operator through pre-training similar to the actual situation is related to the stable operation and protection control technology of the DC transmission system.In addition, the operation reliability of Haenam-Jeju HVDC linkage system is improved and the economic loss in the event of a system accident is reduced. It works.

Based on the real-time algorithm of the present invention, the HVDC control system can obtain the same training results as the actual use of the corresponding Haenam-Jeju HVDC control system. Not only can it be simulated, but it is also possible to examine in advance the effect of unique dynamic characteristics on the system when introducing a system such as inter-Korean linkage and Northeast Asia linkage, and to operate the system in an environment similar to the actual equipment. It can be effective.

In addition, the present invention is expected to be used for power system operation and planning, and as a result, by efficiently supplying inexpensive power to the Jeju system, it has a great effect on system stabilization and damage caused by power failure prevention, and reduction of recovery cost budget. It is expected to be.

Claims (11)

In training HVDC control system, A digital simulator for measuring voltage and current values of AC and DC systems; A current amplifier for amplifying the current value measured by the digital simulator; A voltage amplifier amplifying the voltage value measured by the digital simulator; And An HVDC controller for notifying an operating state of the DC power transmission system in response to an operation signal arbitrarily manipulated by the power system operator and allowing the DC power transmission system to operate in a preset scenario so that a learner can grasp the operation state of the DC power transmission system; HVDC control system for training, characterized in that comprises a. The method of claim 1, wherein the HVDC controller, A measurement cubicle that adjusts the measured voltage and current values to preset conditions; A pole protection unit configured to protect the converter in response to the regulated voltage and current signals; A pager controller in charge of generating a firing signal in response to the adjusted voltage and current signals and a voltage and current command value input from the outside; A pole controller for outputting a voltage and current command value to the pager controller in response to the adjusted voltage and current signals and power / frequency / current input values input from the outside; And A master controller for generating a power / frequency / current request value in response to a preset operation condition and a plurality of commands input from the outside and outputting the generated power / frequency / current request value to the pole controller 6; Training HVDC control system, characterized in that consisting of. The method of claim 2, wherein the pager control unit, Training HVDC control system, characterized in that for outputting the firing signal of the 12-pulse valve constituting one pole. The method of claim 3, wherein the pager control unit, Training HVDC control system, characterized in that for generating a firing pulse by calculating the firing angle in accordance with the command value of the voltage, current calculated by the pole control unit. The method of claim 1, Training HVDC control system characterized in that it further comprises a plurality of switches operated by the simulator to operate the entire system. The method of claim 2, wherein the lower portion of the measurement cubicle, pole control unit and the master control unit, Generates a voltage command control unit that generates voltage bias of the DC line, a current balance unit that maintains the current at the positive frequency at the energetic frequency at the start of the anode operation or when the neutral ground switch is opened or closed, and a loop disable and alpha min signal. An auxiliary loop control unit for outputting the control signal, a frequency control unit for maintaining the inverter system frequency at 60 Hz during constant frequency operation, a blocking control unit for controlling the firing sequence of the valve in Block / DeBlock operation mode by an operator's operation or protection system, An automatic tap-change control unit for generating a tap control signal for maintaining the valve side AC voltage, a power control unit for generating a current command value according to the DC power command value, a signal input from the current balance, frequency control unit, and power control unit PCCS configured with current command controller to generate pole current setpoint using Training HVDC control system that is being provided is. delete delete delete delete delete

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