CN211151553U

CN211151553U - Peak-regulating frequency-modulating system

Info

Publication number: CN211151553U
Application number: CN201922264085.5U
Authority: CN
Inventors: 安晓林; 魏超
Original assignee: Beijing Zhongneng Litong Electrical Equipment Co ltd
Current assignee: Beijing Zhongneng Litong Electrical Equipment Co ltd
Priority date: 2019-07-26
Filing date: 2019-12-17
Publication date: 2020-07-31
Anticipated expiration: 2029-12-17

Abstract

The patent discloses a peak regulation frequency modulation system includes: the peak regulation system comprises an electric heating device, a heat supply pipe network and a first control device; the electric heating device is electrically connected with the bus through a step-down transformer, and obtains heating electric energy from the power grid to heat a heating medium in the electric heating device; the electric heating device is connected with the heat supply pipe network through the heat exchanger and is connected with the heat exchanger, and the heat of the heating medium is transmitted to the medium heated by the heat supply pipe network and is connected with the main heat supply pipe network through the heat exchanger; the frequency modulation system comprises a battery and a second control device; the battery is connected with the output end of the step-down transformer, and the battery acquires power-on energy from the power grid and stores the power-on energy in the battery; and the main controller is connected with the first control device and the second control device. By setting the peak shaving system and the frequency modulation system to be matched with each other, the peak shaving capacity and the power production quality can be improved simultaneously.

Description

Peak-regulating frequency-modulating system

Technical Field

This patent belongs to the energy field, relates to a frequency modulation peak regulation system of combined heat and power generation power plant.

Background

Power production is the primary energy generation means in the prior art, and is typically accomplished by a power plant. In the power generation, the power generation means used by the power plant includes wind power generation, thermal power generation, hydraulic power generation, solar power generation, and the like. In thermal power generation, a large amount of fossil fuel needs to be burned, and thus there is a pressure for environmental protection. In order to utilize more clean energy in the prior art, a peak regulation instruction is generally issued to a thermal power plant when necessary, so that the online electric quantity of thermal power generation is reduced, and conditions are provided for utilizing more clean energy. Therefore, a wide range of thermal power generation peak shaving systems have appeared in the prior art to reduce the amount of power generation of thermal power generation.

However, the peak shaving system in the prior art has a single function, only can adjust the power generation amount of the thermal power generation, but cannot effectively adjust the power generation quality of the thermal power generation, and in addition, due to the addition of the peak shaving system, additional conformity is brought to the power generation quality of the thermal power generation. There is therefore a need in the art to provide a system for thermal power generation or similar energy units with a peak shaving system that has the capability of simultaneously improving peak shaving and the quality of the power production.

Disclosure of Invention

This patent is just proposed based on the above-mentioned demand of prior art, and the technical problem that this patent will be solved provides a peak shaver frequency modulation system to improve the power production quality of the power plant that has the peak shaver system.

In order to solve the above problem, the technical scheme provided by the patent comprises:

a peak shaving frequency modulation system, said system comprising:

a power grid comprising a bus;

the generator is connected with the bus through a step-up transformer;

the peak regulation system comprises an electric heating device, a heat supply pipe network and a first control device; the electric heating device is electrically connected with the bus through a step-down transformer, and obtains heating electric energy from the power grid to heat a heating medium in the electric heating device; the electric heating device is connected with the heat supply pipe network through the heat exchanger and is connected with the heat exchanger, and the heat of the heating medium is transmitted to the medium heated by the heat supply pipe network and is connected with the main heat supply pipe network through the heat exchanger;

the frequency modulation system comprises a battery and a second control device; the battery is connected with the output end of the step-down transformer, and the battery acquires power-on energy from the power grid and stores the power-on energy in the battery;

and the main controller is connected with the first control device and the second control device.

Preferably, the frequency modulation system is electrically connected with the peak shaving system at the output end of the step-down transformer.

Preferably, the electrical heating means comprises a solid electrical thermal storage device, a liquid thermal storage tank and or an electrode furnace.

Preferably, the heat supply pipe network includes inlet tube and wet return, the heat exchanger sets up on the inlet tube, the wet return pass through first pipeline with electric heater unit links to each other, the inlet tube pass through the second pipeline via the heat exchanger with electric heater unit links to each other.

This patent can improve peak regulation ability and electric power production quality simultaneously through setting up mutually supporting of peak regulation system and frequency modulation system.

Drawings

Fig. 1 is a schematic structural diagram of a frequency modulation peak shaving system in this embodiment.

Detailed Description

The following detailed description of the embodiments of the present patent refers to the accompanying drawings and is only for the purpose of illustrating preferred embodiments of the patent and is not to be construed as limiting the scope of the patent.

As shown in fig. 1, the present embodiment provides a frequency modulated peaking system for use in a cogeneration power plant. In a cogeneration power plant, heat supply and power supply are services provided by the power plant, and the heat supply comprises schemes such as heating for a central heating city; the power supply comprises schemes of providing power output and the like. In cogeneration plants, at least part of the heat supply is provided by extracting hot steam from the power generation process and supplying the steam to a main network of heat supply pipes to heat water or similar liquid in the main network of heat supply pipes to supply heat to the target area through the main network of heat supply pipes.

In this embodiment, the peak and frequency modulation system of the cogeneration power plant comprises: the system comprises a power grid 1, a step-down transformer 2, a generator 3, a step-up transformer 4, a peak shaving system 5, a frequency modulation system 6, a main controller 7 and a heat pipe network 8.

In this embodiment, the grid 1 comprises busbars, and an exemplary solution comprises a double busbar solution as shown in fig. 1, but of course also a single busbar solution or another number of busbar solutions. In this embodiment, the adjustment can be made according to the type of the cogeneration plant. The bus can be equipment in a power plant or equipment on an external power grid of the power plant, and a proper wiring mode is selected according to actual production requirements.

The bus is connected with a step-down transformer 2, the step-down transformer obtains power from the bus, and the power on the bus is high, so that the power is converted into the power suitable for utilization through the step-down transformer 2 so as to be used by each system. Therefore, the input end of the step-down transformer is connected with the bus, and the output end of the step-down transformer is divided into two parallel paths, one path is connected with the peak shaving system 5, and the other path is connected with the frequency modulation system 6.

As shown in fig. 1, the peak shaving system 5 includes an electric heating device 9, a main heating network 10 and a first control device 11.

The electric heating device 9 may be various electric heating devices, and the heating medium thereof may be liquid, solid, or gaseous, and the like, and specifically includes a solid electric heat storage device, a liquid heat storage tank, an electrode furnace, and the like. The electric heating device 9 and the output end of the step-down transformer, the output end of the transformer obtains electric energy, the electric heating device 9 converts the electric energy into heat energy, the heat energy can be stored in a heat storage device as heat energy, or a medium can be directly heated, and the medium is output as a heat energy carrier.

The electric heating device 9 is connected with the heat exchanger 12, the heated medium is connected with the main heat supply pipe network through the heat exchanger, the heat exchanger 12 is arranged on the main heat supply pipe network 10 and heats the heat supply medium on the main heat supply pipe network, and therefore heat energy is conveyed out. Preferably, the heat supply pipe network comprises a water inlet pipe and a water return pipe, the heat exchanger is arranged on the water inlet pipe, the water return pipe is connected with the electric heating device through a first pipeline, and the water inlet pipe is connected with the electric heating device through a second pipeline via the heat exchanger; like this at inlet tube position heating heat supply medium, and follow wet return position extraction heat supply medium and form the circulation, avoided because the water pump heat-resisting degree of wet return position is low and the water pump that causes damages.

Through electric heating device can turn into the electric power of power plant or electric wire netting into heat energy, to combined heat and power generation's power plant, when needs peak shaving, can pass through electric heating device reduces the online of electric power and guarantees the normal clear of heat supply production, in addition, can also pass through electric heating device adjusts the quality of heat supply when normal heat supply.

For this purpose, in the present embodiment, the electric heating device is connected to the first control device 11, which is also connected to the main controller, and controls the operation of the peak shaving system according to different requirements. Therefore, the frequency modulation system and the peak shaving system are integrally controlled according to different tasks, and the whole system is integrated into a mutually supporting whole.

As shown in fig. 1, the frequency modulation system includes a battery 13 and a second control device 14, one end of the battery is connected to the output end of the step-down transformer, and the other end of the battery is connected to the input end of the step-up transformer. When the peak regulation is carried out, or on other suitable occasions, the battery stores electric energy, and in the process, the effect of regulating the peak regulation capacity can be achieved. In the process of generating power by the generator, the battery discharges power stored by the battery or stores electric energy output by the generator, so that the power generation quality of the generator set can be adjusted by adjusting the climbing speed of the generator set, the accuracy of a power generation load and the deviation value of the total power generation amount in a short time. The second control device is connected with the battery and controls the battery to work according to the required conditions, and the second control device is also connected with the main control device and receives the control scheduling of the main control device together with the first control device. The frequency modulation system and the peak shaving system are electrically connected at the output end of the step-down transformer, so that power can be supplied to the peak shaving system through the frequency modulation system to adjust the peak shaving quality of the peak shaving system when necessary.

The foregoing is merely an example of the preferred embodiments of this patent and those skilled in the art, having the benefit of the teachings of this patent, will appreciate that many modifications and variations are possible in the details of the above-described embodiments without departing from the inventive concepts of the patent. Since such modifications do not depart from the inventive concept of this patent, they are intended to be included within the scope thereof.

Claims

1. A peak shaving frequency modulation system, said system comprising:

a power grid comprising a bus;

the generator is connected with the bus through a step-up transformer;

2. A peak shaving frequency modulation system according to claim 1,

and the frequency modulation system is electrically connected with the peak regulation system at the output end of the step-down transformer.

3. A peak shaving frequency modulation system according to claim 1, wherein the electrical heating means comprises solid electrical thermal storage means, liquid thermal storage tanks and or electrode furnaces.

4. The system of claim 1, wherein the heat supply pipe network comprises a water inlet pipe and a water return pipe, the heat exchanger is disposed on the water inlet pipe, the water return pipe is connected to the electric heating device through a first pipeline, and the water inlet pipe is connected to the electric heating device through a second pipeline via the heat exchanger.