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Environmental protection science: "turning off the lights for one hour" will destroy the power grid

Environmental protection science: "turning off the lights for one hour" will destroy the power grid

(Summary description)

Environmental protection science: "turning off the lights for one hour" will destroy the power grid

(Summary description)

Information
      "Earth Hour" can reduce electricity consumption mainly from lighting electricity, which accounts for only about 10% of the total domestic electricity consumption. Only a few of them participated in the lights-out activity. Therefore, the reduction in power consumption during the activity is minimal.
   Since the change in the amount of electricity is small, its impact on the power system is also limited. Some people worry that the participants of the event turn on and off the lights at the same time, and instantaneous voltage fluctuations may cause the power supply line to be paralyzed. However, this extreme situation is almost impossible to happen. First, the power consumption that people participating in the “Earth Hour” event can control is limited. Even if the scale of people’s participation cannot be estimated, it is not difficult to estimate the change in power consumption; Identity is not necessary and impossible to be very precise. It is not easy to turn off and turn on the lights at once. The actual situation occurred just before and after the event, and there was a small peak of turning off and turning on the lights. The electricity consumption during this period is relatively stable; in the end, even if the lights are turned on and off at the same time, the power system will not be paralyzed. Between generator sets and users, there is a complex transmission network with scientific design and powerful functions. This multi-regional and multi-level network is always responding to fluctuations in power consumption. For example, the scale and switching simultaneity of urban traffic lighting far exceed those of dispersed users participating in the "Earth Hour" event. The power system still maintains normal operation, and the impact on the power grid is limited, and it will not cause damage to power generation equipment. .
   Then, if "Earth Hour" is implemented on a large scale, will it affect the electricity supply of a city? the answer is negative. The reason is very simple. The operation of generator sets is often slow. Generally speaking, it takes about three days for domestic coal power plants to generate power from the beginning. The speed of nuclear power plants and gas power plants is slightly faster, but it is hoped that the power generation can be based on It is still impossible to change with changes in electricity consumption.
  In the daily power supply, similar situations have always existed. As we all know, there are "peak and valley differences" in daily electricity consumption. Power plants always operate according to a certain amount of power generation, but the power consumption at different times of the day is not the same. There is not enough electricity during peak hours, and no one can use the extra electricity during low valleys, so the power plant has to adopt a method of "cutting peaks and filling valleys" to solve this problem.
   On the technical level, "peak-shaving and valley-filling" means converting the surplus electric energy during the low period of electricity consumption into other forms of energy for storage, and then using the energy to generate electricity after the peak period of electricity consumption. However, the process of storage and release will cause energy loss. From a policy perspective, "cutting peaks and filling valleys" is mainly price guidance, and the implementation of segmented electricity prices.
  Understanding this, it is not difficult to find that it is not feasible to rely on the "Earth Hour" activity itself to save energy and reduce emissions. It is worth noting that unnecessary startup and shutdown of electrical appliances sometimes increases the burden of electricity consumption. If the lighting itself uses energy-saving lamps, the power consumption of the light switch is more than that when the light is stable within an hour. If you deliberately turn off the light for an hour, it may not be worth the loss. In this year's "Earth Hour", some people even spend the hour by "lighting candles". They don't know that this behavior itself will also cause carbon emissions, and the emissions are not necessarily less than turning on the lights.
   From this point of view, the actual effect of "Earth Hour" may not be as great as some people expect, and at the same time, its possible adverse effects are not as serious as others feared. However, the actual purpose of such activities is more to create a "news effect" and arouse public attention to environmental and energy issues. In this sense, "Earth Hour" is indeed meaningful.
   Nowadays, environmental protection has become a focus of public attention. Environmental protection is certainly a social topic, but also a scientific topic, requiring scientific and rational operation. Promote the energy-saving spirit of "Earth Hour" to daily life, reduce energy waste, and slow down the growth rate of urban power demand. This is the real way to protect the environment.

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