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Green Energy Estimate and Monitor System (GEMS)

The statute stipulates that only renewable energy sold greater or equal to 1,000kW must send power generation information to the Taipower’s dispatching control centers. However, nearly 95% of solar photovoltaic power generation information is not returned to the dispatching control centers. At the end of 2019, the total system installation solar photovoltaic capacity was about 3.6GW. In order to accurately grasp the instantaneous power generation of private solar photovoltaic power plants, TPC is developing a Green Energy Estimate and Monitor System (GEMS) which used received PV generation as the basis and other information such as location, AMI and weather forecast, etc. to estimation the power generation of neighboring unmonitored power plants. The GEMS will count the entire solar photovoltaic power generation in Taiwan.

Green Energy Estimate Monitor System (GEMS)


In response to the policy of energy transition in Taiwan, a huge amount of renewable energy will be incorporated into the power distribution system in the future. In order to solve the problem of the power distribution system limited by grid installation strength and intermittent power generation characteristic of photovoltaic power generation system due to maximum grid hosting capability, the Distribution Renewable Energy Advanced Management System (DREAMS) can be used in coordination with smart converted to reduce the power factor of photovoltaic system to absorb the virtual work in order to maintain the voltage quality. In addition to the effective management of the impact of renewable energy on the power distribution system, the simulation analysis of power distribution feeder can verify that, under the same voltage variation constraint, the incorporation of DREAMS in conjunction with the self-adjustment function of smart inverter can enhance the permissible hosting capacity of photovoltaic system of the feeder by more than 20%.

DREAMS Planning and Construction Schedule

The power generation information of the sites with photovoltaic system installation of 100kW to 1,000kW will be collected according to the DNP3.0 communication protocol. The information shall include power generation volume of actual and virtual works, power factory, the voltage at duty point, and relevant set values. The aforementioned information should be sent back to the DREAMS via the 4G communication system.

In mid-to-long-term, the DREAMS is expected to be interfaced with ADMS to execute remote monitoring of the photovoltaic system site via the transmission of a control command to the smart inverter of a photovoltaic system in order to enhance the grid resilience and to maintain good power supply quality based on the maximization of renewable energy.

Periodical Achievement and Plan

TPC will continue to promote friendly grid connection measures in coordination with government policy. We allow applicants to be connected to inner lines of TPC’s customers for full amount power sales, we complete the mechanisms for rental of power distribution pipelines and power distribution wiring service, we lower the standard for INVERTER site with VPC certificate, and we allow the power factor of system impact analysis to be set at 0.9. As a result, last year (2018) we have successfully achieved the target of photovoltaic system grid connection volume set by Bureau of Energy, MOEA at 1GW.

The plan is to adopt DREAMS in coordination with ADMS, so the network topology architecture can be updated in real-time according to the switching operation decision of dispatch of the power distribution system. And the system impact analysis can be conducted based on the power generation information of the photovoltaic system collected by the renewable energy management system in order to derive the control decision of the photovoltaic system smart inverter. In the end, the control station and download the aforementioned control decision to the smart inverter via a 4G communication system to achieve the modulation of PV system power output in order to provide the auxiliary service function required by maintaining the safe operation of the power grid.