OPS/ 007 / 003 - Operational guidance and training ... Document reference OPS/ 007 /003 Version:-1.0

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Transcript of OPS/ 007 / 003 - Operational guidance and training ... Document reference OPS/ 007 /003 Version:-1.0

  • Document reference OPS/ 007 /003

    Version:- 1.0 Date of Issue:- Dec 2013 Page 1 of 22

    CAUTION! - This document may be out of date if printed

    OPS/ 007 / 003 - Operational guidance and training requirements associated with network trials using the Grand Unified Scheme (GUS)

    1. Purpose

    As part of the Customer-Led Network Revolution (CLNR) project, Northern Powergrid will install the Siemens GUS computer system at Manor House. This document provides operational guidance and specifies the training requirements for Control Engineers and CLNR Support Teams to monitor CLNR remote outstation substations and accept alarms from the NMS system.

    Historically our electrical network has been designed to assume that the voltage will degrade the further down the system you go. Due to the increase of embedded generation that is no longer always the case. The number of PV systems being connected has caused a number of voltage complaints and caused primary set points to be lowered to accommodate the higher voltages seen by customers when the PV, or other embedded generation, generates at a time of low load. The aim of the project is to connect a number of new and enhanced devices on the Northern Powergrid electrical system and evaluate the benefits from controlling them both locally and remotely.

    The GUS system interrogates and controls Enhanced Automatic Voltage Control (EAVC) enabled HV and LV equipment and monitoring equipment at locations throughout the Northern Powergrid network. The aim of this procedure is to provide sufficient information and confidence in the way that GUS works so as to allow it to be commissioned and then to permit more detailed and extensive network trials to be performed under the direction of the CLNR Project team and Newcastle University.

    For the purposes of this trial, we will create artificial constraints, rather than genuine breaches of statutory voltage limits or genuine thermal overload.

    The trials will study the behaviour and reaction of the electrical network when EAVC-enabled equipment is deployed in a controlled environment in a number of planned scenarios. These scenarios will cover: • EHV, HV and LV networks • Rural and urban networks • Photovoltaic (PV) clusters on LV networks • Heat Pump clusters on LV networks.

    The trials are designed to rollout in phases so that learning and confidence can be built incrementally whilst maintaining the electrical network in a safe operational manner and within predefined control limits. The trials will also investigate the use of new and enhanced network equipment:

    • Primary substation EHV voltage control tap change transformers • HV regulators • HV capacitor banks • Secondary substation On Load Tap Changer (OLTC) transformers • Battery Electrical Energy Storage (BEES) • LV voltage Regulators • Real Time Thermal Rating (RTTR) monitoring of transformers, overhead EHV and HV cables and underground HV


  • Document reference OPS/ 007 /003

    Version:- 1.0 Date of Issue:- Dec 2013 Page 2 of 22

    CAUTION! - This document may be out of date if printed

    The trials will also study the use of the Siemens GUS control system. This will monitor the electricity distribution network and firstly offer efficiency recommendations in open loop that is without intervention control of the electricity network in a controlled environment. Then GUS will include closed loop autonomous control with computer recommended interventions to optimise the electricity network.

    The results of these trials will provide information to understand how various technologies and techniques can address network issues such as HV and LV system headroom capacity (see definitions), network flexibility and power flow. This understanding will enable us to recommend guidance rules for improving the efficiency of the electrical distribution network and the benefits that these technologies and techniques can bring to customers. The conclusions and recommendations of the findings will be published in academic papers and to the Electricity Industry and shared within the company.

    This document supersedes the following documents, all copies of which should be destroyed.

    Ref Version Date Title

    N/A N/A N/A N/A

    2. Scope

    This document applies to the Siemens GUS control system, for the duration of the CLNR programme, on the following Northern Powergrid network systems:

     Denwick 20kV network, excluding control of Windylaw Capacitor Sw, including control of the 66/20kV transformers at Denwick substation;

     Rise Carr 6kV network, including control of the 33/6kV transformers at Rise Carr substation;

     Maltby (Photovoltaic Cell) Mortimer Road 44548 and Tickhill Road 400V networks, including control of the 11000/400V transformer at Mortimer Road and at Elgar Drive on the LV network;

     Sidgate Lane (Heat Pump Cell) 400V network;

     Manor House GUS central computer and control centre;

     Newcastle University, data warehouse;

    2.1 GUS Trial Methodology GUS is an active control system from Siemens comprising a Power CC Central control system and Remote Distribution Controllers (RDCs). The Power CC Central unit is a computer system based in the Manor House Control room, with web based views available at other locations. The RDCs are capable of running their own algorithms to control certain aspects of the End Network Devices (ENDs) that they are connected to.

    PowerCC uses a dynamic network model, state estimator (see 2.2 CLNR components) and monitoring to get a view of the electrical system and to detail a list of tolerance violations. It has a detailed set of algorithms that operate in conjunction with a Volt Var controller to offer control recommendations to resolve these violations. Its primary function is to optimise network operation with no violations. These include voltage and thermal limits. Other options are also available to optimise for losses and/ or cost.

    The RDC is located at a substation equipped with the new CLNR control technology. It has inputs and outputs (I/Os) from the END and other monitoring devices on the site. The commands sent consist of a change in set point or a change in the mode of operation of the device. The RDC will send the position of devices and load information back to PowerCC. If communication to PowerCC it lost due to a telecommunications fault or if told to work in RDC mode, it can also use its own algorithms to determine how to control the devices by returning to default network settings, working in local isolation from the central control.

  • Document reference OPS/ 007 /003

    Version:- 1.0 Date of Issue:- Dec 2013 Page 3 of 22

    CAUTION! - This document may be out of date if printed

    GUS has been designed not to control devices directly, but to give them set point targets. In the case of the EAVC no tap up or tap down commands are given, but just a change of set point. For electrical energy storage, a real power (P) and reactive power (Q) set point is given, keeping the system equipment in its normal operating mode as much as possible. A typical trial scheme is shown in Fig1 as an example.

    Fig 1 Typical CLNR Project Scheme Connections to the HV and LV Network at Rise Carr

    Figure 1 above is an illustration of how the Battery Electrical Energy Storage system is connected the Rise Carr primary

    substation network.

    2.2 CLNR Components The following is a summary of the equipment and techniques that will be used during the CLNR trials.

    Monitoring – Monitoring devices have been connected to the HV and LV networks to bring back real time data. It is taking a sample every minute. This data is currently being collected on an ihost server. When the control system is in place, some of this data will be forwarded to the new GUS system

    Darlington Melrose LV Distributor (EES at Harrowgate Hill SS)

    High Northgate SS LV Bus bar

    Rise Carr Primary SS

  • Document reference OPS/ 007 /003

    Version:- 1.0 Date of Issue:- Dec 2013 Page 4 of 22

    CAUTION! - This document may be out of date if printed

    GUS – An active control system which will monitor the whole system utilising a network model which uses a State Estimator and external monitoring to optimise the system under its control. It consists of a PowerCC computer, which is fed information from Remote Distribution Controllers (RDCs)

    EAVC – Enhanced Automatic Voltage Control. Existing AVC devices have been supplemented with SuperTapp N+ relays which are able to receive a new voltage set point from a remote device. New AVC devices include HV on load tap changer controlled by a tapconn 230 unit and a Powerstar LV regulator to allow voltage control further down the system

    BEES – Battery Electrical Energy Storage. Includes one 5MWh battery with 4 quadrant inverter capable of supplying 2.5MVA for 2 hours. Two 200kWh batteries with 4 quadrant inverter capable of supplying 100kW for 2 hours and three 100kWh batteries with 4 quadrant inverter capable of supplying 50kW for 2 hours.

    RTTR – Real Time Thermal Rating. CTs and associated weather stations connected on both HV and EHV OH feeders. Temperature gauges are used to calculate transformer thermal ratings. A modified CRATER tool is used to calculate UG thermal ratings capacity. The GUS calculations will advise the potential headroom capacity gained over static performance characteristics of conductors and electrical plant.

    DSR – Deman