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Others claim to be ready, but Apparent has been California Rule 21 compliant since 2009.

Excerpts from the ruling…

“…generating facility operators must install the smart inverters, capable of communications…”

“The proposed effective mandatory date of the requirements adopted herein should be the later of December 31, 2015, or 12 months from the date the Underwriters Laboratory approves the applicable standards.”

“Our goal of having enhanced inverters deployed expeditiously while minimizing market disruption is best achieved by allowing existing inverters installed prior to the revision of Electric Tariff Rule 21 to be replaced with an inverter that may or may not be classified as a Smart Inverter.”

“Today’s “smart inverters” have many capabilities, including:

  • The generation or absorption of reactive power so as to raise or lower the voltage at its terminals.
  • Delivery of power in four quadrants, that is, positive real power and positive reactive power; positive real power and negative reactive power; negative real power and negative reactive power; and negative real power and positive reactive power.
  • The detection of voltage and frequency at its terminals and the ability to react autonomously to mitigate abnormal conditions: to provide reactive power if the voltage is low; to increase real power output if the frequency is low.
  • to deliver real and reactive power

Smart inverters can improve the performance of the distribution grid and the network as a whole. ”


“Revisions to Electric Tariff Rule 21 Phase 1:

  1. Anti-Islanding Protection: Revise Electric Tariff Rule 21, Section H.1.a.(2) to reflect proposed new voltage ride-through settings;
  2. Low and High Voltage Ride-Through: Revise Electric Tariff Rule 21, Section H.1.a.(2) and Table H.1 to reflect proposed new default voltage ride-through requirements;
  3. Low and High Frequency Ride-Through: Revise Electric Tariff Rule 21, Section H.1.a.(2) and R21 Table H.2 to reflect proposed new frequency ride-through settings;
  4. Dynamic Volt-Var Operation: Revise Electric Tariff Rule 21, Sections H.2.a, H.2.b, H.2.i and R21 table H.1 to reflect proposed new dynamic volt/var operations requirements;
  5. Ramp Rates: Add new Electric Tariff Rule 21 subsection within Electric Tariff Rule 21, Section H to include proposed new ramp rate requirements;
  6. Fixed Power Factor: Revise Electric Tariff Rule 21, Section H.2.i to reflect the proposed new fixed power factor requirements;
  7. Soft Start Reconnection: Revise Electric Tariff Rule 21, Section H.1.a.(2) to reflect proposed new reconnection by soft-start method. “

“Inverters installed after the effective date of the requirements adopted in today’s decision should comply with the updated standards applicable to all inverters.”

“The Joint Motion of Pacific Gas and Electric Company, Southern California Edison Company and San Diego Gas & Electric Company Regarding Implementation of Smart Inverter Functionalities filed on July 18, 2014, should be granted consistent with today’s decision.”

 

Full .pdf available here CPUC order