Challenges

Increasing Hosting Capacity of DER

Coordinated Control of MV Voltage Regulators by Utilizing Smart Meter Data

Background

Voltage regulator
Voltage regulator
Sensor-equipped swichgear
Sensor-equipped swichgear
Hosted capacity of PVs in Chubu area
Fig. 1. Hosted capacity of PVs in Chubu area.

Capacity of photovoltaic generators (PVs) installed to the power grid has been growing rapidly since feed-in-tariff scheme for RES started in 2012 in Japan. Most of the PVs are installed to MV and LV distribution networks causing voltage rises, and for minimizing investment, it is crucial to manage these voltage rises with least number of voltage regulators. This will be realized by introducing coordinated, automatic and remote control of regulators by utilizing real-time metered data.

Proposal

Utilizing smart meter as sensing devises for grasping load consumptions and PV outputs

By utilizing smart meter data along with data from sensor-equipped switchgears, actual load consumptions and PV outputs of every customers will be grasped in detail. Network voltage will then be calculated from them. This is one of the use cases of smart meter data.

Fig. 2. Example of the calculated results
Fig. 2. Example of the calculated results

Remote control of voltage regulators based on grasped load consumptions and PV outputs

According to the grasped voltage profiles, control parameters, i.e. target voltages and dead bands, of regulators will be determined on-line. Finally, they will be transferred remotely to each of the regulators. This enlarges hosting capacity of PVs, specifically 1.6 times when applied to the distribution line on Fig. 2. Moreover, this method is also effective in reducing tap operations of regulators, with expectations on longer lifespans (Fig. 4).

Fig. 3. Results on voltage regulation with SVR on Fig. 1 with max. PV capacity.
Fig. 3. Results on voltage regulation with SVR on Fig. 1 with max. PV capacity.
Fig. 4. Tap operation of SVR on Fig. 1.
Fig. 4. Tap operation of SVR on Fig. 1.

Future Plans

We are currently developing this new control method. The new system is aimed to be completed by the end of FY2020. By using it, we try to keep appropriate voltage profile in distribution system.

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