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Bigwood Systems, Inc.

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Secure & Control Suite

BSI SecureSuite

SecureSuite is BSI's set of on-line solutions for Energy Management Control Center Operations and off-line study-case tools for utility planning and engineering departments, all built on the patented BSI foundation.

  • TEPCO-BCU module performs on-line exact transient stability assessment and available transfer capability evaluation.
  • VSA module evaluates voltage security of the system based on real-time system operating conditions.

  • TEPCO-BCU

    TEPCO-BCU(On-line Transient Stability Assessment), a result of seven years joint product development between the Tokyo Electric Power Company, Tokyo, Japan and Bigwood Systems, is jointly owned, supported, and marketed by TEPCO and Bigwood. On-line DSA (Dynamic Security Assessment) offers several significant engineering and financial benefits. First, power systems may be managed with operating margins reduced by a factor of 10 or more if on-line DSA, which is based on actual system configuration and operating conditions, is performed instead of assumed worst-case conditions, as is done in off-line DSA. A second benefit of on-line DSA is that it enables accurate determination of available transfer capability constrained by dynamic security to allow the operator to load the system to maximum throughput. The overall savings gained by increased MW transaction capability can reach hundreds of thousands of dollars per hour.

    Key Functions
  • Real-time transient stability assessment for large contingency lists
  • Insecure and critical contingencies identification
  • On-line transfer capability calcliation based on transient stability constraints
  • Providing available transfer capability (ATC) at specific interties and the corresponding limiting contingency
  • Providing transient stability margin as operating margin for each critical contingencies
  • Performing time domain simliation for user-specified contingencies

  • Key Features
  • Contingency types include both three-phase fault with primary clearance and single-line-to-ground fault with backup clearance
  • Categorize insecure and critical contingencies with details such as fault type, fault location and circuit lost
  • Parallel design for real time application with the implementation of distributed parallel computing platform
  • EMS integration capability

  • Key Benefits
  • Improve situational awareness
  • Save manpower in stability analysis
  • Reduce operating margin of a factor of 10 or more
  • Enable accurate utilization of the transmission capability
  • Load system to accurate / maximum throughput
  • Support the dispatch of remote cheap generators
  • Support renewable energy transmission
  • Allow more energy trading

  • Multiple Modes
  • TEPCO-BCU/RT: Real-Time Mode
  • TEPCO-BCU/LA: Look-Ahead Mode
  • TEPCO-BCU/STUDY: Study Mode
  • TEPCO-BCU/DA: Day Ahead Mode
  • TEPCO-BCU/STUC: Short Term Unit Commitment Mode
  • TEPCO-BCU/RE: Renewable Mode


  • VSA

    VSA(On-line Voltage Stability Assessment) is an integrated computer package developed by BSI for voltage security assessment in real-time mode or on-line study mode.

    This tool, which is designed for large-scale interconnected power systems in the FERC's open-access transmission, has been successfully evaluated on several power systems ranging from 2,000 buses to 15,000 buses. The integrated package provides the following analysis and control functions with respect to voltage collapse:

    Key Functions
  • Contingency screening and ranking of a large set of credible contingencies in terms of load margins to voltage instability
  • Identification of severe contingencies with zero or negative load margins
  • Computation of exact voltage security load margin of a specified contingency list
  • Compute the exact load margin to voltage collapse for the base case and each top-ranked contingency

  • Key Features
  • Support of large contingency list for on-line analysis
  • Handling significant penetration of volatile renewable energy
  • Highly secure, critically secure and insecure contingency classification
  • Exact voltage security load margins for base case and top-ranked contingencies

  • Multiple Modes
  • VSE/RT: Real-Time Mode
  • VSE/LA: Look-Ahead Mode
  • VSE/STUDY: Study Mode
  • VSE/DA: Day Ahead Mode
  • VSE/STUC: Short Term Unit Commitment Mode
  • VSE/RE: Renewable Mode


  • BSI ControlSuite

    With our SecureSuite, network operators and planners can assess the system performance in terms of stability and security. But with our ControlSuite, they will be able to take actions or adjustments with system-supplied preventive/enhancement control actions.

  • TEPCO-BCU Enhancement module explores the unique information of system transient stability and design effective preventive/enhancement controls guaranteeing system stability.
  • VSE module determines effective enhancement controls to increase the load margin by exercising all the no-cost and low-cost controls before resorting to load shedding.

  • TEPCO-BCU Enhancement

    The TEPCO-BCU Enhancement package provides on-line transient stability preventive control with TEPCO-BCU-Preventive module, and enhancement/emergency control with TEPCO-BCU-Control module.

    Key Functions
  • Preventive control for insecure contingencies
  • Enhancement control for critical contingencies
  • Minimum-number control
  • Minimum-cost control

  • Key Features
  • Support various control devices: generators, capacitors, transformers, etc.
  • Support minimum-number and minimum-cost control preferences
  • Parallel design for real time application with the implementation of distributed parallel computing platform
  • EMS integration capability

  • Key Benefits
  • Save time and manpower in dealing with the insecure and critical contingencies
  • Guarantee power network security
  • Improve system reliability


  • VSE

    The VSE (On-line Voltage Stability Enhancement) module provides enhancement control, preventive control and load margin and sensitivity calculations with respect to voltage collapse.

    Preventive Control
  • The Preventive Control Table shows the output of Preventive Control processing by VSA&E. The 5 recommended control actions shown when taken will mitigate all 4 insecure contingencies identified by the Contingency Ranking Analysis. The load margins of the 4 insecure contingencies, which are zero or negative before the preventive control, are all raised such that the load margin of all 4 contingencies are increased to the range from 424 MW to 2832 MW after the preventive control is applied.
  • Given these existing paragraphs for Preventive Control and Enhancement Control these two additional images are needed.


    Enhancement Control
  • Using the same set of available controls as the preventive control, the enhancement control of VSA&E allows the operator to specify a desired (target) amount in MW of increase in load margin for a contingency or the base case. Enhancement control returns a priority-based, minimum set of control actions to execute the desired load margin increase. The output table shows that by executing the 4 recommended control actions the load margin is enhanced by 207 MW increasing the margin from 2710 MW to 2917 MW.
  • Given these existing paragraphs for Preventive Control and Enhancement Control these two additional images are needed.


    2-Level Control
  • Level-1 Control: Reactive power compensating devices; ULTC; Phase-shifters; Real Power Generations; Generator terminal voltage.
  • Level-2 Control: Load shedding - load shedding by location and amount
  • Improve system reliability


  • O-Margin

  • Load-margin-V/A: On-line Operating Margin to Voltage Limit/Real-Time
  • Load-margin-T/A: On-line Operating Margin to Thermal Limit/Real-Time
  • Load-margin-S/A: On-line Operating Margin to Steady-State Limit/Real-Time

  • Modes: Look-Ahead / On-line Study / day-ahead / RE



    O-Margin-Enhance

  • Load-margin-V/E: On-line Operating Margin Enhancement to Voltage Limit/Real-Time
  • Load-margin-T/E: On-line Operating Margin Enhancement to Thermal Limit/Real-Time
  • Load-margin-S/E: On-line Operating Margin Enhancement to Steady-State Limit/Real-Time

  • Modes: Look-Ahead / On-line Study / day-ahead / RE