10/07/2019 09:08:14

Developed 'massively' solar power causing overloading of substations

Last time, solar power projects "massively" invested in Ninh Thuan and Binh Thuan provinces, causing overloaded transmission grid, causing damage to investors and buyers. 

Recently, solar power plant projects have been "massively" invested in Ninh Thuan and Binh Thuan provinces ...
Overload transmission grid in this area has been warned in advance. The fact is that the power system is short of supply, but the factory cannot deliver full capacity.


This is causing damage to investors and buyers of Electricity of Vietnam.
Why reduce capacity?

According to a report from the Electricity of Vietnam (EVN), by the end of June 2019, the country had 89 wind and solar power plants, with a total capacity of 4,543.8 MW, accounting for 8.3% of the total. capacity of the national electricity system. This figure has far exceeded the expectations of the revised VII Power Plan (only 850 MW of solar power capacity was put into operation in 2020).
There are 38 wind and solar power plants in Ninh Thuan and Binh Thuan, with a total installed capacity of 2,027 MW. It is expected that by December 2020, wind and solar power capacity in these two provinces will increase to 4,240 MW.
While the local capacity is very large, the load demand of Ninh Thuan and Binh Thuan is very small. According to the equilibrium calculation of the capacity of the National Power System Regulation Center (A0), in Ninh Thuan province, from now to December 2020, only ranges from 100-115 MW and Binh Thuan from 250-280 MW.
Therefore, the capacity needed to transfer from these two localities is also very large, with Ninh Thuan being from 1,000-2,000 MW and Binh Thuan being from 5,700-6,800 MW (including traditional power sources).
This hot development has led to the fact that the majority of 110-500 kV transmission lines and substations are overloaded; including overloaded line up to 360%.
Specifically, the transmission lines and transformer stations in the provinces of Ninh Thuan and Binh Thuan are always overloaded with 110 kV Thap Cham-Hau Sanh-Tuy Phong-Phan line. %; 110 kV Phan Ri-Song Binh-Dai Ninh transmission line with a load of 140%; 110 kV Da Nhim-Don Duong transmission line with 123% load; 550 kV Di Linh transformer station with 140% load; 220 kV Duc Trong-Di Linh substation carries 110% load ... This load level continues to increase in the near future.
Overloading the transmission grid system forced A0 to cut the capacity of wind and solar power plants at some point in order to ensure safety for the electrical system. The increase / decrease of capacity of renewable energy plants is implemented by A0 according to regulations to ensure publicity, transparency and timeliness.
In particular, A0 also applies automatic power adjustment software (AGC), directly controlling the capacity of renewable energy plants, in order to maintain the flow of power within the permitted threshold.
Mr. Nguyen Duc Cuong, Director of A0 said that EVN / A0 also wants to get full power from renewable energy sources, because the price of electricity from renewable energy is expensive (VND 2,086 / kWh), but still cheaper than oil thermal power (from 3,000-5,000 VND / kWh).
Meanwhile, EVN still has to mobilize oil-fired thermal power with high cost to ensure the supply of electricity to meet the load demand. In source mobilization, renewable energy sources are always prioritized to maximize mobilization according to regulations.
“We have put all our efforts in the past to hope that solar power plants will be put into operation, adding capacity to the system. But now has to reduce capacity due to overloading the grid, which EVN / A0 does not want, "Cuong affirmed.
The representative of Electricity Department of Electricity and Industry (Ministry of Industry and Trade) also said that most of the solar power investors in Ninh Thuan and Binh Thuan areas already know about the transmission network overload and must reduce capacity. The immediate task is to find solutions to accelerate transmission grid projects.

Quickly build the grid to relieve
According to the representative of the investor of Phuoc My Solar Power Plant (Ninh Thuan), the solar power plants from the start of construction to the time of operation only in a very short time and the full support of EVN , A0, Power Trading Company has a very important meaning in the past.
There are times when the factory needs to test, even if the registration time is very close, but the units of EVN still perform timely, including weekends, even during the April 30 holiday. Efforts by EVN and units are undeniable. However, if the overload is prolonged, all parties will be damaged.
In the coming time, it is very necessary to join hands from the Ministry of Industry and Trade, local authorities, investors, EVN ... to solve obstacles and accelerate the progress of transmission grid projects to clear all capacity of factories, adding power to the country.
According to Mr. To Van Dan, Head of Investment Management, National Power Transmission Corporation (EVNNPT), to release the capacity of renewable energy sources in Ninh Thuan and Binh Thuan in the period 2020- 2021, the Corporation has implemented 12 lines / 220 kV-500 kV substation projects; of which 6 projects are under planning and 6 projects are not yet planned.
However, according to Mr. To Van Dan, the delay in clearance and site clearance is the cause of slow transmission projects. Currently, 2 projects in the construction phase are facing difficulties in site clearance.
Specifically, the 220 kV Phan Ri substation project, despite the construction and installation contractor from 12/2018, has not been constructed yet due to difficulties in compensation and site clearance. Up to the time of June 20, 2019, the mobilization of 4,508 / 39,619.2 m2 has been mobilized.
Meanwhile, the 220 kV Nha Trang-Thap Cham transmission line project is planned to be energized in December 2019. However, currently having problems in 55 nail positions through natural forests, it is required to report to the Prime Minister a decision to change forest use purposes.
Mr. Tran Dinh Nhan, General Director of Vietnam Electricity Group, said EVN determined that releasing capacity of renewable energy projects is an especially important task.
Recently, the Group has drastically directed EVNNPT units, Southern Electricity Corporation (EVNSPC) to accelerate the progress of power grid projects. At the same time, EVN leaders also worked with local leaders to speed up the ground clearance for projects. However, currently many projects of capacity clearance still face many difficulties due to difficulties in procedures and site clearance ...
According to Mr. Nhan, in order to deploy a solar power project, the investor only takes about 6 months, even in a shorter time, can receive electricity. There was a project 2 months ago which was a vacant land.
Meanwhile, to implement a 220 kV transmission grid project, 500 kV takes about 3-5 years. Therefore, in parallel with the maximum effort of EVN, to deploy as quickly as possible the project of releasing capacity of operating renewable energy plants, Mr. Tran Dinh Nhan wishes to receive the sharing, support from local authorities and investors.
Local authorities should consider and direct departments and agencies to be more aggressive in compensation and site clearance. Localities also need to be flexible in supporting affected households to hand over the ground to the construction contractor, along with carrying out the procedures for compensation and site clearance as prescribed.
In the future, in order for the solar power plant to operate safely and reliably, EVN leaders also asked investors to complete technical problems and complete the required tests; urgently invest and install the forecasting system to generate solar power and wind power, transmit data on moderation level ..

 

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