There are currently more than one million photovoltaic microwaves in Poland with a total capacity of more than 7.3 GW. PTPiREE, which represents the network operators to which the micro-installations are connected, believes that increasing the number of micro-installations and increasing their unit capacity can cause problems. The organization even demands that network operators be able to refuse to join the micro-installation or reduce its capacity.
The Polish Electricity Transmission and Distribution Society (PTPiREE) reported that at the end of March, the number of consumer micro-installations in the country exceeded 1 million and their capacity exceeded 7.3 GW. Thus, in the first quarter of this year alone, 152,000 people joined the network. consumers with devices with a total capacity of 1.26 GW.
At the same time, the average capacity of microinstallations is increasing. While the average capacity of connected micro-devices in 2020 was 6.68 kW, last month it was already 8.3 kW.
PTPIREE estimates such a trend “In most cases, self-consumption of electricity is not a positive thing, as it is not possible, and this may indicate the large size of micro-installations.
Commenting on the development of the consumer market, the association representing network operators said that “In most cases, micro-installations cooperate with the LV network without interruption and without adversely affecting its parameters, but under certain conditions and given the dynamic increase in the number of micro-installations, problems can arise from the power grid. Presence of distributed generation in LV network ”.
As calculated by PTPiREE, the risk of problems with the installation of micro-installations with the power grid increases if the following conditions occur alone or in combination:
- the number and capacity of micro-installations in the area provided by one MV / LV station,
- Large distance of micro-devices from MV / LV power plant,
- high line resistance and reactivity (small conductive cuts, uninsulated network),
- low power consumption during periods of highest production capacity (highest insolation hours),
- expansion of the existing micro-installation by its owner without informing the operator of the distribution system.
PTPiREE reports that the main negative phenomenon in terms of power distribution is the risk of non-compliance with the quality parameters of electricity at a certain point in the network or in the entire LV circuit, resulting in an increase in voltage. Operation of PV micro-devices.
“Unstable operation of PV converters sometimes leads to an excessive increase in the long-term vibration index (Plt). It is possible that with the further increase in the number and capacity of installed micro-installations, LV networks will also be overloaded. “ – Informs PTPIREE, while ensuring that network operators carry out a number of organizational and investment activities to ensure the safe operation of the network and the extraction of energy from the micro, in addition to activities related to the process of connecting micro-installations to the network. devices.
The activities carried out by network operators aimed at minimizing the negative impact of micro-installations on the network include:
- Installation of transformers with more power than customers need,
- installation / replacement of cables with increased cross-sections,
- Shortening of 0.4 kV circuits (if possible),
- construction of energy storage,
- Providing control over the operation of PV facilities,
- installation of compensation devices.
However, in spite of the above measures, in the event of overloading of lines as a result of the operation of micro-installations, he said, “DSOs are legally designed to ensure the health and safety of micro-installations or other buyers, as well as occupational safety. reduce its capabilities. networks and devices connected to them ”.
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