Integration of Distributed Power Source

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Connection process

The Ho Chi Minh City Power Corporation (EVNHCMC) has developed a dedicated section for rooftop solar power (RTS) on its Customer Care website since 2019. This section provides essential information including the Government’s feed-in tariff (FIT) mechanism, regulations of the Ministry of Industry and Trade and Vietnam Electricity (EVN) regarding the purchase of RTS power, information of connection for capacity release, incentive programs, RTS investment cost/efficiency quick calculation tool, etc.

Figure 1: The RTS section on EVNHMC’s website

EVNHCMC negotiates connections and energy purchases for RTS systems based on the FIT mechanism issued by the Government of Vietnam. The process has been optimized to provide maximum convenience for customers, as detailed below:

Figure 2: Flowchart of the connection process up to PPA

Installed capacity

+ For RTS

Ho Chi Minh City (HCMC) is not only the biggest city but also the largest concentration of load in Vietnam. As developing distributed power sources has become a popular trend around the world to enhance power supply reliability and stability, RTS systems are currently the most effective and optimal distributed generation solution for cities with high urbanization and population density such as HCMC. RTS systems help reduce electricity costs and mitigate irradiation to the roofs, cooling the spaces below. Customers can sell surplus energy to the grid under a preferential pricing mechanism regulated by the Government that lasts for 20 years. In terms of the environment, RTS is a clean energy technology that helps reduce CO2 emissions and the greenhouse effect.

As of August 1, 2021, HCMC has 14,250 RTS systems in operation with a total capacity of 365 MWp.

+ For BESS system:

EVNHCMC is implementing a pilot Microgrid project with the integration of renewable energy (i.e. photovoltaic – PV) and Battery Energy Storage System (BESS) at EVNHCMC’s Data Center. The project is expected to be completed and put into operation by the end of 2021 with the following main parameters:

(i). BESS system with an installed capacity of over 350kWh that

  • Meets the maximum capacity of 288 kW of the server computer system (critical load).
  • Meets the criteria of uninterrupted power supply for critical loads of the Data Center in the event of grid failure, factoring in the delay for the generator to start up and connect to the Microgrid for backup power supply (up to 30 minutes).
  • Meets the needs for power consumption reducing during peak hours and load curtailment (Demand Response).

(ii). BESS system in operation meets the following main objectives and requirements:

  • Actively reduce consumption of power received from the grid at peak hours (in combination with the rooftop PV system with the total PV capacity = (47.2kWp + 90kWp) to feed to the Microgrid).
  • Participate in load capacity curtailment (peak cut) when needed (or requested).
  • Maintain backup power (in real-time) for the Data Center when there is a power grid failure.
  • Compensate active/reactive power to ensure the required power quality.
  • Shift the electricity demand of the load during the day (Load Shifting).
Figure 3: Model of BESS system at EVNHCMC’s Data Center

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