DE20102619U1 - Display for power generation plants - Google Patents

Description

OTRONlC GmbH & Co KG J &Ggr;*. . j j · *&iacgr; ffraite Josef Schulte

1
Utility model application

The invention relates to a device for displaying energy generation from light (photovoltaic systems), whereby the energy is fed into the public grid via inverters. The energy fed in is recorded via alternating current meters.

State of the art:

The generation of energy using photovoltaic systems requires effective monitoring of the system to ensure it is functioning properly. The demonstration of energy generation from light radiation is also used for representation and training purposes.

Displays consisting of sensors and a display unit are known, which show the current performance of the inverters and the proper functioning of the inverters. In the event of technical defects in the inverters, this is also displayed and, if necessary, reported acoustically. The connection between the sensors and the display unit is wired or via a wired or wireless radio connection.

There are also known displays that detect the counting pulses of the feed-in meters and use them to display the current radiated power as well as the daily or otherwise summed total of the feed-in.

All known displays show one or more of the following values: current power, total power, temperature, current light irradiation, total light irradiation, functional status of the photovoltaic system. No consideration is given to the setpoint values of a specific photovoltaic system based on its installation, vertical alignment and azimuth alignment.

The invention is based on the task of creating an intelligent display that can show additional meaningful system values in addition to the known values. The additional values include the comparison of the current performance values with a target curve that depends on the day, the environment and the season. This increases the informative value of the display and increases the control for maintaining performance. In the event of deviations from the target values determined in this way beyond an adjustable tolerance level, an alarm device is provided that alerts the user to the deviation.

OTRONIC GmbH & Co KG &Iacgr;:". . &iacgr;' .·* * * frarjz Josef Schulte

The task is solved by first showing a calculated daily target curve on the display, under which the effective daily curve is then arranged. The target curve can now be continuously shown as the possible output of the specific system as an actual possible target value by learning from error-free actual values. This also requires the integration of an additional light measuring unit to record the actual irradiance.

A particularly advantageous embodiment of the display according to the invention is that the individual elements of the display (counter sensor, light sensor, display unit) are connected by radio. In the case of a range between the transmitter and receiver that is too great, it can be advantageous to use a so-called radio relay between the transmitter and receiver. This relay receives the signals from the transmitter and sends them on to the receiver with a short time delay. In this way, several relays can be switched one after the other, thus bridging greater distances than with a simple radio link.

OTRONIC GmbH & Co KG &iacgr; ·**· * : : .* * ' Franz Josef Schulte

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Example:

The invention is explained in more detail using an embodiment by means of a drawing: It shows

Fig. 1 is a schematic block diagram of the display

Fig. 2 a possible display representation of calculated target curve and actual performance curve

Fig. 3 shows a possible display representation of a learned target curve and actual performance curve.

Fig. 1 is explained below.

The display shown in Fig. 1 consists of

- Counter sensor (2) for detecting the speed of the counting disc (alternatively detecting the counting pulses) of a feed-in meter (1)

- Evaluation and transmission unit (3)

- Receiving and evaluation unit (4)

- Display unit (5), consisting e.g. of an LCD display.

The meter sensor (2) records the passage of a mark on the disc with each revolution of the counting disc on the feed-in meter (1). The time between the occurrence of two consecutive passes of the mark is recorded in the evaluation unit and transmitted as a binary value by radio from the transmitting unit to the display unit. The receiving and evaluation unit (4) calculates the current power value from the time information and the programmed meter factor.

In Fig. 2, the calculated daily target curve for a specific location is shown on the display unit (5) according to longitude and. Below this, the power actually fed in during the day is shown graphically. The target curve is calculated according to the location of the system (latitude and longitude) and a value adjusted to the position of the sun on a daily or monthly basis, for example. Below this, the display of the work actually fed in is shown. The differences to the target curve can occur for various reasons: variable solar radiation (e.g. due to clouds, shading of the system by mountains, hills, etc.).

OTRONIC GmbH & Co KG *&iacgr;"'·-·* \ ♦*" * ! Fraraz Josef Schulte

ground, outbuildings or trees,) as well as environmental restrictions on the optimal alignment of the photovoltaic surface. These recurring losses in performance can now be learned by the system (after just 2 days) and the target curve is adjusted taking the stored values into account. If the actual value deviates from the learned target curve by an adjustable amount after the learning phase, the user is informed by the alarm unit in the display.

Fig. 3 shows such a learned curve. A photocell, which has been placed in the same direction as the photovoltaic surface in relation to the sun and which can also send its values wirelessly to the display unit, now specifies the value that the system should feed in at any given time. The current target value is then taken into account once with the maximum possible value at that particular time. The target curve is learned by registering the maximum values at discrete times, e.g. hourly, and these values are compared with the calculated values. If a deviation repeats several times a day at the same time under otherwise identical conditions, the target curve is adjusted accordingly. This learning process assumes that there is optimal sunlight and that the photovoltaic system and the downstream system components are working optimally. This is checked by the user. This is shown on the display as an indication that the learning process is in progress.

The advantages achieved with the invention are in particular that the entire system components up to and including the feed-in meter can be monitored and the location-specific conditions can be taken into account for each individual photovoltaic system when estimating the system output. This means that an alarm can be given in good time if the system has a defect in one of the system components. On the other hand, the learned target curve can show the user weaknesses in the system configuration.

Claims (4)

1. Display for photovoltaic systems comprising a sensor for detecting the current power, an evaluation unit, a transmission unit between the evaluation unit and the display, and a display, characterized in that an alarm device is provided which responds when the current power curve deviates from a calculated and/or a learned power curve beyond an adjustable tolerance value. 2. Device according to claim 1, characterized in that the transmission of information between transmitter and receiver takes place by radio and, if necessary, a radio relay is used to increase the range. 3. Device according to claim 1 to 2, characterized in that a light sensor is designed in the same orientation as the photovoltaic cells so that on the one hand it detects the reference value, transmits the value to the display and on the other hand simultaneously represents a power supply for the integrated transmitting device. 4. Device according to claims 1 to 3, characterized in that in addition to the display, a storage unit is connected to the sensor, with which the detected power values and/or the detected light values can be stored.