Patents Assigned to Toshiba Mitsubishi-Electric Industrial Systems Corporation
  • Patent number: 11728742
    Abstract: A power conversion apparatus capable of supplying a required reactive power while dynamically changing a dead band near 0 reactive current and maintaining a balance of DC voltage is provided. The power conversion apparatus including a three-level converter, a PWM controller for the three-level converter, an input current detector of the three-level converter, a coordinate converter that converts the current into a d-axis and q-axis current feedback, the reactive power control unit that controls a reactive power and outputs an reactive current reference, a d-axis current control unit having a dead band part for setting the d-axis current reference with hysteresis characteristics in the q-axis current feedback, and outputs the d-axis voltage reference, a q-axis current control unit that outputs a q-axis voltage reference based on the q-axis current reference, an inverse coordinate converter that outputs a three-phase AC voltage command based on the d-axis and q-axis voltage reference.
    Type: Grant
    Filed: April 29, 2021
    Date of Patent: August 15, 2023
    Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation
    Inventors: Shunsuke Tobayashi, Hiromitsu Suzuki
  • Publication number: 20230249235
    Abstract: In preset calculation, a plurality of cooling banks are set to be feedforward or feedback banks, and each of water injection amounts in these banks is calculated. In cooling history management, a recalculation position for re-executing the feedback calculation is set. In feedback calculation, a temperature correction value for compensating a delay due to a conveyance time period from a position of the feedback bank to a position of a delivery side pyrometer, and a response delay of the feedback bank is calculated, when a segment reaches the recalculation position. In the feedback calculation, each of water injection amounts in the feedback banks that is calculated in the preset calculation is changed for each of segments based on a delivery side temperature target value, a delivery side temperature actual value calculated for each of the segments, a delivery side temperature prediction value that is recalculated, and the temperature correction value.
    Type: Application
    Filed: June 15, 2021
    Publication date: August 10, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Kazutoshi KITAGOH, Hiroyuki IMANARI, Naoki SHIMODA, Yuki OKANO, Sanga TAKAGI
  • Publication number: 20230251624
    Abstract: A drawing creating device generates HMI configuration data for a system monitoring screen from a network configuration diagram drawn by drag-and-drop operation. An HMI server device executes a system monitoring process by applying HMI configuration data to a predetermined server runtime library, and transmits a display signal according to the communication status of a monitored device. An HMI client device draws the system monitoring screen on a web browser and changes the display statuses of the parts positioned on the system monitoring screen according to the received display signal. According to the present invention, the system monitoring function of an industrial plant can be implemented in a non-programmable graphical manner.
    Type: Application
    Filed: July 7, 2021
    Publication date: August 10, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Ryo SHIMIZU, Akira NOJIMA, Nobuo SHIMIZU
  • Patent number: 11720082
    Abstract: A SCADA web HMI system dynamically distributes server connection priority lists from web HMI servers to HMI clients in accordance with order of assignment which takes load balancing into account. As a result, preliminary settings associated with connection priority do not need to be made on the HMI clients. Also, since the server connection priority lists are assigned to the HMI clients in accordance with the order of assignment which takes load balancing into account, the numbers of clients connected to the individual web HMI servers are equalized and the load balancing can be ensured. The SCADA web HMI system can reduce the operating costs necessary in client settings while ensuring redundancy and load balancing of servers.
    Type: Grant
    Filed: October 10, 2019
    Date of Patent: August 8, 2023
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Ryosuke Higashiya, Akira Nojima, Nobuo Shimizu, Ryo Shimizu
  • Patent number: 11722050
    Abstract: Each of a plurality of unit converters includes: a main circuit; a control circuit that controls the plurality of switching elements according to a control signal received from the controller; a power supply that lowers a voltage of a first capacitor to generate a power supply voltage and supplies the power supply voltage to the control circuit; and a current-limiting resistance circuit having a variable resistance value and disposed between the main circuit and the power supply. The power supply includes a second capacitor, an overcharge suppression circuit, a power supply circuit, and a controller. The controller includes: an overcharge suppression control circuit that controls the overcharge suppression circuit in accordance with a magnitude of a voltage of the second capacitor; and a resistance switching circuit that changes a resistance value of the current-limiting resistance circuit in accordance with a magnitude of a voltage of the first capacitor.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: August 8, 2023
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Takayuki Yachida, Jumpei Isozaki, Taichiro Tsuchiya
  • Publication number: 20230246565
    Abstract: An external storage device for a control apparatus of a power conversion system to which data from a power conversion system can be written even by a program small in size. The external storage device for the control apparatus of the power conversion system includes: a plurality of file storage areas each configured to store data from the power conversion system; and a file management area configured to manage data for setting a format not using a file system applied to a terminal apparatus, as a format for storage of the data in the plurality of file storage areas.
    Type: Application
    Filed: June 29, 2021
    Publication date: August 3, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Yoshihiro TAWADA, Tomoya KATSUKURA, Daichi YAMASHITA, Masahiro USHIRO
  • Patent number: 11716044
    Abstract: A power conversion device includes an inverter, a current detector, a frequency analysis processor, a storage, a determination unit, a reference rotational rate change unit, and a rate controller. The determination unit determines a frequency at which a signal component having a magnitude exceeding a prescribed value has been detected among frequency components of a load current, generates restriction information for excluding a reference rotational rate for a rotational rate corresponding to the detected frequency based on a determination result after the determination, and causes the storage to store the generated restriction information. The reference rotational rate change unit changes a reference rotational rate of an electric motor so that mechanical resonance of the detected frequency is avoided based on the stored restriction information. The rate controller controls a rotational rate of the inverter using the changed reference rotational rate.
    Type: Grant
    Filed: September 2, 2019
    Date of Patent: August 1, 2023
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Fumio Watanabe
  • Patent number: 11716008
    Abstract: A power supply includes a second capacitor, an overcharge suppression circuit, a power supply circuit, and a controller. The controller includes: an overcharge suppression control circuit that controls the overcharge suppression circuit in accordance with a magnitude of a voltage of the second capacitor; and a resistance switching circuit that changes a resistance value of the current-limiting resistance circuit depending on whether a gate block state occurs or not and in accordance with a magnitude of the voltage of the first capacitor. In the gate block state, each of the switching elements is fixed in a non-conductive state.
    Type: Grant
    Filed: August 9, 2019
    Date of Patent: August 1, 2023
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Jumpei Isozaki, Taichiro Tsuchiya
  • Publication number: 20230238592
    Abstract: A power conditioning subsystem (PCS) includes an inverter circuit configured to mutually covert direct current (DC) power of a storage battery and alternating current (AC) power, a command value acquiring portion configured to acquire a command value from a higher-level apparatus to charge or discharge the storage battery, a DC voltage acquiring portion configured to acquire a DC voltage on the storage battery side, and a limiter processing portion configured to perform a process of setting to limit each of an upper limit and a lower limit of the command value acquired by the command value acquiring portion on the basis of the DC voltage acquired by the DC voltage acquiring portion.
    Type: Application
    Filed: April 28, 2021
    Publication date: July 27, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Haiqing LI
  • Publication number: 20230236584
    Abstract: When a general-purpose operation part (22, 23) is hidden by a window part (24), it becomes hard for an operator to visually check an association state between a field device (10A, 10B) and a hardware switch (3). If such a display state has occurred, an HMI server (5) stops a health check signal which is being output to a PLC (6). The PLC (6) detects the stop of the health check signal and forcibly cancels the association state between the field device (10A, 10B) and the hardware switch (3). Thus, a human error can be prevented.
    Type: Application
    Filed: November 24, 2020
    Publication date: July 27, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Vittal RAO, Akira NOJIMA, Nobuo SHIMIZU, Ryo SHIMIZU
  • Patent number: 11705828
    Abstract: A power conversion device according to an embodiment includes a cell, a first sensor, a second sensor, a storage, a first controller, and a second controller. The first controller is configured to control or protect the cell on the basis of at least one of an output result of the first sensor and an output result of the second sensor. The second controller, in a case in which a change in at least one of the output result of the first sensor and the output result of the second sensor satisfies a first condition, is configured to execute at least one of a first operation of storing the output result of the first sensor in the storage, a second operation of storing the output result of the first sensor in the storage over a second period longer than a first period, and a third operation of storing the output result of the second sensor instead of the output result of the first sensor.
    Type: Grant
    Filed: November 20, 2018
    Date of Patent: July 18, 2023
    Assignee: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Shunsuke Tobayashi
  • Publication number: 20230216429
    Abstract: An electric power conversion apparatus includes: an electric power conversion circuit that allows a DC terminal to be connected to a DC power source via a DC bus line, and performs at least one of converting DC power of the DC power source into AC power to output, or converting AC power into DC power to output; a DC switch turned on when the electric power conversion circuit performs electric power conversion; an AC switch provided on a side of the AC terminal, and turned on when the electric power conversion circuit performs the electric power conversion; a DC voltmeter that measures a potential at a predetermined portion, on a side of the DC terminal; a ground connection portion that connects the DC bus line and ground potential; and a control circuit connected to the electric power conversion circuit, the DC switch, the AC switch, and the DC voltmeter.
    Type: Application
    Filed: April 27, 2020
    Publication date: July 6, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Masakazu OKAYASU, Issei FUKASAWA, Masahiro KINOSHITA
  • Publication number: 20230208185
    Abstract: An uninterruptible power supply apparatus having a plurality of power conversion modules and a bypass module connected in parallel between an AC power supply and a load. Each of the power conversion modules includes a first terminal that receives AC power from the AC power supply, a second terminal connected to a power storage device, a third terminal for outputting AC power to the load, a converter, an inverter, and a first control circuit. The bypass module includes a switch connected between the AC power supply and the load, a first voltage detector that detects an AC voltage applied to the first terminal, a second voltage detector that detects a DC voltage applied to the second terminal, a third voltage detector that detects an AC voltage applied to the third terminal, and a second control circuit.
    Type: Application
    Filed: April 16, 2021
    Publication date: June 29, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Ryogo IMANISHI, Yousuke HAYASHI
  • Publication number: 20230208319
    Abstract: A control device for a power conversion device includes a voltage recognizing unit configured to detect a voltage at a linkage point of the plurality of power converters, and a control unit configured to control an amplitude and a frequency of a voltage to be output by a power converter to be controlled on the basis of active power and reactive power output by the power converter to be controlled in a case that the power converter to be controlled is caused to perform autonomous operation as a voltage source, and controls active power and reactive power to be output by the power converter to be controlled so as to compensate for excess or deficiency of active power and reactive power at the linkage point on a basis of an amplitude and a frequency of the voltage detected by the voltage recognizing unit.
    Type: Application
    Filed: August 25, 2020
    Publication date: June 29, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Yoshinori TSURUMA
  • Publication number: 20230208275
    Abstract: A semiconductor switch drive device (3) includes a drive unit (10), a power supply unit (20), a switch (39), and a control unit (50). The drive unit (10) supplies a control signal to a semiconductor switch (Q) of a main circuit (2) and drives the semiconductor switch (Q). The power supply unit (20) supplies electric power to the drive unit (10). The switch (39) cuts off supply of electric power to the power supply unit (20) by detecting or controlling an overvoltage state on a primary side of the power supply unit (20). The control unit (50) switches a conductive state of the switch (39) on the basis of a voltage of a control terminal of the semiconductor switch (Q).
    Type: Application
    Filed: May 12, 2020
    Publication date: June 29, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Fumio WATANABE, Tetsuya OKAMOTO
  • Publication number: 20230208308
    Abstract: A power converter includes a converter, an inverter, and a control unit. The converter converts electric power supplied from a power supply side to DC power. The inverter is provided on an output side of the converter. The control unit is configured to calculate a control difference between a target value for a target control voltage in a DC section provided on the output side of the converter and a feedback value using a DC voltage of the DC section as the feedback value, to perform a nonlinear operation process on the control difference, and to calculate an operation value based on a result of the nonlinear operation process and control the converter using the operation value.
    Type: Application
    Filed: May 21, 2020
    Publication date: June 29, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Takumi ITO, Kentaro NABESHIMA, Masashi NAKAMURA
  • Publication number: 20230209739
    Abstract: A dust-proof structure of an embodiment includes a housing and a magnetic member. The housing accommodates an electric device. The magnetic member is magnetized. The magnetic member is arranged in a flow path of a gas that flows through a ventilation port formed in the housing.
    Type: Application
    Filed: September 15, 2020
    Publication date: June 29, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Mitsuru HANO
  • Publication number: 20230198291
    Abstract: An uninterruptible power supply device includes a housing having a rectangular parallelepiped shape, a plurality of units vertically stacked and accommodated in housing, and a fan unit having a plurality of fans aligned on an upper surface of housing. Each of the upper surface and the lower surface of housing is formed with an opening through which a wire is led into housing.
    Type: Application
    Filed: December 1, 2020
    Publication date: June 22, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Koki NAKAMURA
  • Publication number: 20230184011
    Abstract: A lock mechanism according to an embodiment includes an engaging portion, a hook, and a pressing portion. The engaging portion is provided in any one of a housing and a door that is configured to open and close a housing opening portion of the housing. The hook is provided in the other one of the housing and the door to be rotatable around a rotation axis, is engageable with the engaging portion, and is normally disengaged from the engaging portion by its own weight. The pressing portion is provided separately from the hook and is configured to press the hook. The hook includes a hook side engaging portion that is configured to engage with the engaging portion with the rotation axis interposed therebetween, and a hook side pressing portion that is configured to cause the engaging portion to engage with the hook side engaging portion by being pressed by the pressing portion.
    Type: Application
    Filed: May 29, 2020
    Publication date: June 15, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventor: Keisuke INAMASA
  • Publication number: 20230188030
    Abstract: A power conversion device is provided, and includes a major circuit part, and a control device; the major circuit part includes a power conversion part converting, into AC power, power that is input, and a filter circuit causing the AC power output from the power conversion part to approach a sine wave; the control device controls power conversion by the major circuit part by controlling an operation of the power conversion part; the control device includes an overcurrent suppression controller; the overcurrent suppression controller calculates instantaneous value voltage output command values of the phases of the AC power output from the power conversion part to suppress an overcurrent at the output end of the major circuit part. Accordingly, a power conversion device and a control device of the power conversion device are provided in which the generation of an overcurrent can be suppressed even when a voltage-controlled operation is performed.
    Type: Application
    Filed: March 25, 2021
    Publication date: June 15, 2023
    Applicant: TOSHIBA MITSUBISHI-ELECTRIC INDUSTRIAL SYSTEMS CORPORATION
    Inventors: Tatsuhito NAKAJIMA, Yasuaki MITSUGI, Tomoya KATSUKURA