Intelligent lighting energy-saving distribution cabinet based on voltage stabilization technology

The "Green Lighting" project is a systematic project implemented nationwide to save lighting electricity and protect the ecological environment. GGDZ intelligent lighting energy-saving distribution cabinet is a new energy-saving product developed in accordance with this requirement and combined with the patented technology of contactless voltage stabilizer.

1.1 Voltage regulation and power saving

From the lamp power formula P = U2/Z, we know that for a specific lamp, the power consumption increases by approximately 5% when its supply voltage U increases (decreases) by 5%.

The supply voltage of the lamp can save a lot of electricity.

This part of the circuit is mainly composed of sampling unit, time control unit, solid-state relay unit, main control board, compensation transformer unit and protection circuit. Among them, the working principle diagram of one-phase compensation circuit is shown in Figure 2. In the figure, BT1, BT2 and BT3 are three independent compensation transformers (generally 3 to 4, selected according to the voltage regulation accuracy and the required input voltage range), and its secondary compensation voltage is generally set to 7V, 14V, 28V (or 5V, 10V, 20V), etc. S1~S12 are 12 solid-state relays (S1~S4 and BT1, S5~S8 and BT2, S9~S12 and BT3 form 3 power bridges respectively). If the output voltage Uo is higher than the set value due to the increase of input voltage Ui or load change, the main control board will sample, compare and judge, so that the compensation transformer will work, generate reverse polarity compensation voltage, and reduce the output voltage to within the set value. For example, in order to generate 7V compensation voltage, S1/S4 and S2/S3 are triggered and turned on alternately to put BT1 into operation. When the output voltage Uo is lower than the set value, after sampling, comparison and judgment, the main control board microcomputer triggers the solid-state relay in the opposite sequence, so that the compensation transformer generates a positive polarity compensation voltage and increases the output voltage to within the set value. As shown in the figure, the compensation voltage generated when BT1, BT2 and BT3 are all put into operation can reach ±49V (or ±35V). During power-saving operation, the power-saving cabinet changes the set voltage according to the instructions output by the time control unit. For example, at a specific time, the first power-saving voltage 209V (adjustable) is automatically output to soft-start the lighting fixture. Before 12:00 in the evening (the time can be set arbitrarily by the program), the lamp has been running at this power-saving voltage. Late at night, the voltage continues to rise, while the illumination requirement decreases. Therefore, under the action of the microcomputer and the time control unit, the energy-saving distribution cabinet gradually reduces the output voltage to another stable voltage suitable for late night lighting-the second power-saving voltage 195V (adjustable) to achieve greater energy-saving effects. Afterwards, at a set time before dawn, the voltage is raised to the first power-saving voltage, and the lights are turned off at the specified time. When to turn on the lights, when to turn off the lights, when to output the first power-saving voltage, when to output the second power-saving voltage and the working mode, etc. can all be set and changed on the full Chinese display interface. After using the GGDZ intelligent lighting energy-saving distribution cabinet, the power saving effect achieved by intelligent voltage stabilization alone can generally reach 20% to 30%.

1.2 Improve power factor and save electricity

The GGDZ intelligent lighting energy-saving distribution cabinet is equipped with a "power factor improvement unit", which can automatically adjust the power factor according to the load conditions in the circuit and provide sufficient reactive power capacity. For the same power load, the total power capacity can be saved by about 15% to 25%, thus meeting the power department's requirements for reactive power compensation and avoiding fines due to low power factor. After the power factor is improved, the total current in the lighting circuit is reduced and the reactive power loss is reduced.

Surge transients seriously reduce the power efficiency of a system. GGDZ intelligent lighting energy-saving distribution cabinet has unique surge suppression components and multiple filters inside to eliminate surge harmonics, effectively eliminate the interference or damage of transients to the system's electrical equipment, reduce the increase in electrical equipment and line losses caused by transient surges, and improve the power efficiency of the entire system.

GGDZ energy-saving power distribution cabinet uses patented contactless voltage stabilization technology and selects high-quality components for manufacturing. The product can work continuously and stably in harsh power grid environments and complex load conditions, achieving long-term maintenance-free operation. Other features are shown in Table 1.

3.1 Selection of power-saving cabinet capacity

Assume that the energy-saving cabinet supplies power to 90 high-pressure sodium lamps (400W each). According to the technical manual of ordinary high-pressure sodium lamps, the rated current of 400W high-pressure sodium lamps is 4.6A.

Total current per phase = 4.6A/lamp × 90 lamps ÷ 3 phases × 1.1 = 151.8A

The rated current of the energy-saving distribution cabinet should be greater than or equal to this current; referring to the GGDZ distribution cabinet manual, the GGDZ-3100 intelligent lighting energy-saving distribution cabinet with three-phase 100kVA and rated current of 152A per phase can be selected. That is, the capacity of the three-phase distribution cabinet can be selected according to the following formula:

Rated current of energy-saving distribution cabinet ≥ rated current of each lamp × number of lamps ÷ 3 × 1.1

For single-phase distribution cabinets, you can select in a similar way:

Rated current of energy-saving distribution cabinet ≥ rated current of each lamp × number of lamps × 1.1

Assuming that the sodium lamp works for 13 hours a day, the average lighting voltage before the energy-saving cabinet is put into operation is 231V, and the lighting voltage after it is put into operation is 209V and 195V, each working for 6.5 hours, then the investment cost can be recovered in one year. Adding the extension of lamp life and the reduction of maintenance costs, the total benefit is higher. Moreover, the service life of GGDZ intelligent lighting energy-saving distribution cabinet is up to 15 years, and one-time investment can benefit for a long time.

3.2 Use of power saving cabinet

According to statistics, lighting electricity accounts for about 13% of the national electricity consumption, and the annual cost of lighting is about 80 billion yuan. From these two figures alone, we can see the great significance of implementing power saving for lighting products and lighting systems. GGDZ intelligent lighting energy-saving distribution cabinet is a very practical energy-saving product with a power saving rate of more than 20% (up to 55%). Using this product in factory lighting, municipal lighting, traffic lighting and public lighting can not only save a lot of electricity bills and extend the service life of the original lighting network, but also effectively reduce the emission of SO2 and other pollutants from thermal power plants and protect the ecological environment.