Participant Technical Reference Manual - IESO

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3.Dispatch Information IMO_MAN_0024 3.2 Dispatch Message Exchange 3.2.1 Overview 195 Market participants using a dispatch workstation will be integrating directly with the EMS systems at the IESO and will require interaction with the Message Exchange system. Market participants that require this module will be receiving the client software from the IESO via the network and will be instructed on its installation and application. 196 Message Exchange information will be stored in the IESO Operations Database (ODB), for use by the Compliance Monitor. This verifies that the requested dispatch actually takes place based on the measurement availability. 197 The market participant will: acknowledge receipt of the message; accept or refuse the dispatch request; and perform the requested control action. 198 The Message Exchange function is used by the IESO to send dispatch instructions to the market participants. This function is triggered by the dispatch request of an application (such as energy dispatch) to issue a message either automatically by Inter-Control Center Communications Protocol (ICCP) or by WEB-based Message Exchange or manually (off-line by telephone or fax) by the Exchange Coordinator to a market participant. 199 The Message Exchange function sends dispatch instruction to the IESO market participants using ABB‟s ICCP Block 4 capabilities or the WEB-based Message Exchange facilities. 200 In order to interface with the Message Exchange using ICCP the market participants must also have ICCP Block 4 configured on their dispatch workstations and have specialized software to interpret and manage the ICCP block 4 messages. 201 WEB-based Message Exchange is an alternative facility made available to the IESO market participants that can be use to support the Message Exchange requirements. The WEB-based Message Exchange adds additional capability to the existing Message Exchange functionality. WEB-Based Message Exchange permits dispatch instructions to be sent to the market participants using browser compatible user interface and application programming interface. These interfaces will be included with the delivery of this product. WEB-Based Message Exchange will be simpler to deploy than the ICCP-based Message Exchange and more cost effective for the market participants, however this may be a less reliable approach. 58 Public Issue 21.1 – March 15, 2010 - estimated
Participant Technical Reference Manual 3. Dispatch Information 202 Interfaces (see figure below) shows the relationship that Message Exchange (ME) has with other parts of the system. Most of the functions are internal to IESO however on the right of the diagram is the interface with the market participants. Resource Dispatch Operator ME Overview P A Interchange Scheduler Message Exchange ICCP Interface R T I C Application X Compliance Monitor WEB interface I P A N T Figure 3-1: Message Exchange Interfaces 203 Specifics of ICCP Block 4 are discussed in the ICCP guidelines, which can be ordered from EPRI – Report TR-107176 over the Internet. 204 A WEB-Based Message Exchange user guide has been posted on the IESO Web site. The user guide provides information on message displays, user actions and contract management message displays, etc. Market participants are encouraged to consult the Web site for further details and latest updates to the user guide. 3.2.2 Functional Parts 205 Message Exchange (ME) consists of several independent functional parts: a. An ICCP Server responsible for establishing and maintaining the communication between utilities using the ICCP protocol and maintains the communication parameters and status for each link. b. A Web Server (Servlet or Application Server) responsible for establishing and maintaining communication between market participants using the https protocol and managing user logins, client requests, publishing client response to SCADA (Supervisory Control and Data Acquisition), subscribing to & performing action requests from SCADA and publishing results of action requests to SCADA. Issue 21.1 – March 15, 2010 - estimated Public 59
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Participant Technical Reference Manual - IESO

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