The Siemens Spectrum PowerTM Microgrid Management System (MGMS) is an advanced control and optimization software, used to maximize the value of your onsite energy resources in coordination with local utility or wholesale market rates. Spectrum Power MGMS has the ability to forecast site electrical and thermal loads and – while taking into account the current electric and fuel/gas utility prices – will execute a comprehensive resource optimization routine in order to find the economic optimal unit schedules for the next 24 hours. These schedules are dispatched in real time, turning units on and off, and sending the economic optimal operating set points. This results in significantly decreased operating expenses from electricity and, in the case of thermal projects, fuel purchases.
The most valuable function of Spectrum Power MGMS is the optimal coordination of dispatchable generation (gas, diesel generators, CHP, etc.), renewable generation (PV, wind, etc.), energy storage (batteries), and loads (via Building Management System or remotely-operated switches). This optimal coordination allows two major functions:
The Spectrum Power MGMS optimization module allows each microgrid owner to determine at an aggregate level whether to optimize generation scheduling and dispatch based on economics or emissions. Based on demand forecasts, renewable generation output, unit economic efficiencies, and the energy import tariff, Spectrum Power MGMS will optimize the mix of energy produced between all forms of generation/storage both electrical and thermal. Spectrum Power MGMS is able to provide such optimization up to a week in advance.
Spectrum Power MGMS performs the shedding or disconnecting of loads when requested by an operator or automatically during disturbance conditions (such as islanding or insufficient generation) to maintain system stability. The function has a modular design that can be adapted to meet specific requirements. The loads are ordered according to predetermined priority schemes. Thus, transitioning operations can be executed with the most important loads remaining connected.
The Sequence of Operations (SOO) function within Spectrum Power MGMS allows preprogrammed operational actions to be executed autonomously or manually. These operational actions could be the individual steps to island the network, or conduct a black start restoration in the event of an unplanned grid outage. The SOO eliminates the need for PLC programming logic by making this possible in an easy-to-use MGMS web display.
The Spectrum Power Historical Information System (HIS) provides a solid and reliable archive to store power system, economic, and emissions historical data. Features include periodic and spontaneous data collection, integrated data reduction and compression, a calculation engine, manual update capability, disturbance data collection, replay, easy integration with external tools, and an energy accounting module. Reporting on year-to-date economic and emission targets is a valuable feature for any microgrid project.
The MGMS platform includes a rich complement of standard features that are vital to operation of any distributed generation systems:
In microgrid operation, a series of operational actions must be performed upon occurrence of certain events. These series of operational actions are known as Sequence of Operations (SOO). For example, if a black out occurs due to an unplanned grid outage, a series of actions must be performed to restore the microgrid, similarly when grid power is restored, a series of actions must be performed to resynchronize the microgrid to the main grid. Another example of SOO is if equipment fails, or if a demand response event is scheduled. SOO, in general, can be used to achieve a wide variety of tasks in a microgrid. There is a display within Spectrum Power MGMS for SOO where the event trigger, preconditions, and sequence of operations can be defined. This allows different sequences such as planned islanding, black start restoration, and grid resynchronization to be easily configured on a per-project basis.
The use case for auto and manual grid resynch is in the event that the grid unexpectedly becomes deenergized and the microgrid isolates itself and operates in an islanded configuration. From the dashboard, the user can select a check box labeled “Auto-Resynch”. If this check box is selected, the microgrid will automatically resynchronize to the grid system upon the grid being energized. If the check box is not checked, the user will have to manually click the “resynch” button to execute the sequence of operations to resynch the microgrid into a grid-connected state.
In case the microgrid has a cogeneration unit producing thermal and electrical energy, Spectrum Power MGMS is able to model both the electrical and thermal output of the unit for the given fuel consumption rate. This in conjunction with the ability to forecast electrical and thermal load for the site, Spectrum Power MGMS to optimally schedule the CHP unit to minimize energy expenses. Spectrum Power MGMS looks at the cost of fuel for the CHP (natural gas, diesel, etc.), the cost of electricity from the grid (using energy rates), and the cost of thermal generation from onsite boilers (natural gas or other fuel), from this the most economic operating state of the microgrid will be defined and executed looking 24 hours/7 days ahead.
In the event of a resource unexpectedly tripping offline or loss of communications Spectrum PowerTM MGMS will automatically mark that resource as “outaged” and exclude it from scheduling until the resource is back online. This means Spectrum PowerTM MGMS autonomously notes which resources are available/unavailable and from this meets the economic or emission goals of the site using only those resources that are known to be available.
There is a display within Spectrum PowerTM MGMS that allows a user to easily create different types of schedules. It is important for a microgrid operator to be able to schedule an outage for a resource for say – scheduled maintenance, or in some cases the microgrid operator may need to schedule other kind of operations like derate on a resource, or a demand response event which is often an import constraint. Another kind of schedule may be a fixed generation schedule; an example could be generation schedule for a fuel cell which is often used as base generation. All of these schedules are able to be configured and updated from a simple scheduling display Spectrum PowerTM MGMS.
Within Spectrum PowerTM MGMS you are able to configure the rate structure you have with your electric utility in a single display. This display gives you the ability to define multiple seasonal tariffs as well as time of use (TOU) energy rates and demand charge rates from your electric bill. This information can be easily configured upfront and adjusted in the future. The optimization engine will use these rates to minimize operational energy expenses when scheduling onsite generation.
In the event that the microgrid is islanded with a high-penetration of solar PV generation, the optimization engine within Spectrum PowerTM MGMS will identify situations where there is excess generation of PV that needs to be curtailed (shut off). The acceptable penetration level (%) of solar PV can be defined within the system for islanded operation, anything in excess of this will be curtailed to ensure system stability.
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