IEEE 2030.7-2017 pdf download

IEEE 2030.7-2017 pdf download.IEEE Standard for the Specificationof Microgrid Controllers.
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The characteristics of the dispatch function, including the elements and characterization of the function, are given in Table 1. Under steady state conditions, the dispatch function shall carry out the operations described below for the two states of the microgrid, grid-connected (SS 1) and islanded (SS2), see Figure 4. During transitions, it receives infomiation about the nature of the transition to be carried out and executes required operations. The transition modes include unplanned islanding (Ti), planned islanding (T2), black start (T4). and reconnect (T3).
6.2.2 Grid-connected operation
The specific features in grid-connected operation shall include:
a) DER asset controllcommand, either individually or in a coordinated manner
b) Load management, curtailable loads
c) Dispatch control, either in the form of a look-up table or an optimization function (if applicable)
d) Operation of breaker, switches, and other switching and control devices, as applicable
e) Voltage regulation, using appropriate methods, including capacitor switching, transformer tap- changers, and the reactive power (var) produced by inverter-based interfaces
0 Implementation of power exchange levels (P, Q) at the P01
6.2.3 Island operation
The specific features in islanded operation shall include:
a) DER asset controllcommand. either individually or in a coordinated manner
b) Load management, curtailable loads
c) Dispatch control, either in the form of a look-up table or an optimization function (if applicable)— setting the net (P, Q) at the POT to 0
d) Operation of breaker, switches, and other switching and control devices, as applicable
e) Voltage regulation, using appropriate methods, including capacitor switching, transformer tap- changers, and the reactive power (var) produced by inverter-based interfaces
f) Frequency control using a reference microgrid generator or storage resource
g) Maintaining power quality levels, ensuring continuous monitoring of power quality levels, and taking appropriate remedial actions.
6.2.4 Transition modes
As indicated in 5.3.1, the dispatch function responds to external events by re-dispatching resources. Such events include transitions, see Figure 4. These modes of operation are associated with transitions described in 7.1. The relevant features of the dispatch function shall include:
a) Planned islanding (T2)—The dispatch function shall implement the relevant operations described in 7.2.2.
6.3 Developing metrics for the dispatch function
The measurable quantities to which metrics are associated, for the dispatch function, Table 1, are:
a) Directly measurable quantities: voltage and current (time-domain waveforms)
b) Derived quantities: frequency, rms voltage, rms current. phase angle. real power (including direction of power flow), reactive power (leading or lagging), energy exchanged at the POT, power quality indices (voltage and current harmonic distortion, individual harmonics, voltage sags, voltage swells. rapid voltage changes [RVCJ, flicker), reference tracking errors
Requirements and metrics are discussed in B.3.
6.4 Scenarios for testing the dispatch function
Scenarios shall be defined for each of the following basic steady state dispatch operating modes shown in Figure 4 and described in Table I:
a) Grid-connected operation—Variation of load and generation within the microgrid, impact on the operation and (P, Q) flows within the microgrid and the (P. Q) flows at the P01
b) Islanded operation—Variation of load and generation within the microgrid, impact on the operation and (P. Q) flows within the microgrid and the (V. f) fluctuations at the POT and within the microgrid;
For each of the basic dispatch modes, the dispatch function features, under function characterization in Table 1, shall be tested using measurable quantities, 6.3, allowing parameter values to be extracted and compared to metrics to determine conformance. Requirements and metrics are discussed in B.3.
The test scenarios shall consider the following conditions that should allow a complete and comprehensive testing of the dispatch function:
The operation of the microgrid—These shall include the operating conditions before a specific test on the microgrid control system is performed: level of local generation and generation mix (dispatchable and non-dispatchable), operation of the storage device (mode of operation, state of charge), load composition (constant impedance, constant P-Q and active loads) and load mix (percentage composition), status of breakers, switches, and voltage control devices, and power (P. Q) exchanges between the microgrid and the grid (prior to a transition from grid-connected to island modes).
The state of the grid at the time of the test is pertbrmed—These shall include the voltage at the POT and any disturbances occurring on the grid at the time of the transition.
The test scenarios shall consider the following inputs to the dispatch function.