CN212409199U - Photovoltaic direct-drive refrigeration house energy flow control system - Google Patents

Abstract

The utility model discloses a freezer energy flow control system is directly driven to photovoltaic, including photovoltaic array, photovoltaic inverse control frequency conversion all-in-one, compressor controller, compressor, condenser, choke valve, evaporimeter, circulating water pump, solenoid valve, check valve, proportional control valve and air-cooler. This freezer cooling system adopts the drive of distributing type photovoltaic energy, for realizing the solar energy maximize utilization, the controller that has the maximum tracking technique has been adopted, and carried out transformation optimization to the compressor of freezer cooling system, change traditional single inverter compressor into and adopt two inverter compressor parallel operation, can realize photovoltaic array output's maximize utilization, for abandoning the stability that the battery ensured distributing type photovoltaic energy system output electric energy, consequently adopt the ice cold-storage to replace the battery stored energy, realize resource rational utilization and energy maximize utilization.

Description

Photovoltaic direct-drive refrigeration house energy flow control system

Technical Field

The utility model relates to a photovoltaic directly drives freezer energy flow control system belongs to solar energy low temperature refrigeration technology field, especially the design and the manufacturing field of ice cold-storage freezer system.

Background

With the development of modern agriculture, the industry of the refrigeration house is rapidly developed in the storage of poultry meat, fruits and vegetables, and from the view of environmental protection consciousness, the energy and environment problems caused by the use of compressor refrigeration equipment are solved. Compare traditional commercial freezer, novel environmental protection freezer has more important meaning, and solar energy directly drives ice cold-storage freezer system and can obtain make full use of in the hot no cold area throughout the year.

SUMMERY OF THE UTILITY MODEL

For make full use of distributing type independent energy, the utility model provides a freezer energy flow control system is directly driven to photovoltaic matches the coupling purpose for improving distributing type photovoltaic module generated energy and refrigerating system energy, the technical scheme of the utility model: a traditional single variable frequency compressor is changed into two variable frequency compressors. For improving refrigeration ice-storage efficiency, make photovoltaic module and refrigerating system energy optimization match coupling, the utility model discloses an innovation is that the frequency conversion compressor system is by a high-power frequency conversion compressor and a miniwatt frequency conversion compressor parallel operation, through control strategy for two compressors start operation periods are inconsistent, make ice cold-storage fully and completely by photovoltaic power generation.

The utility model provides a photovoltaic directly drives freezer energy flow control system mainly comprises photovoltaic module, the contrary frequency conversion all-in-one that accuse of photovoltaic of taking maximum power, compressor controller, compressor system, condenser, choke valve, evaporimeter and circulating water pump, solenoid valve, check valve, proportional control valve and air-cooler, as shown in figure 1, the technical problem that solve is that distributed photovoltaic module matches and the coupling with refrigerating system energy, realizes 24 incessant coolings in freezer system hours. In order to overcome the limitation of solar radiation intermittency on the working cycle of a photovoltaic refrigeration system, solar energy resources in the daytime need to be fully utilized to realize high-efficiency photovoltaic ice making and store the high-efficiency photovoltaic ice making as much as possible, and the cold energy stored in the daytime is utilized to continuously supply cold at night, and the form of ice storage is used for replacing electric power storage, so that the electric power storage cost can be saved, and the energy conversion loss between light, electricity and cold can be effectively reduced; secondly, in order to improve the solar energy utilization rate and widen the solar energy irradiance utilization range, the compressor of the traditional ice making system must be optimized and modified, the traditional ice making system is a single alternating current/direct current compressor and has rated power, voltage and current values, the rotating speed of the maximum output power is also fixed, the ice making system cannot be always ensured to work at the maximum output power rotating speed, when the rotating speed is insufficient, the ice making efficiency is influenced, the rotating speed is too high, and energy waste is caused. In addition, only when the energy supplied by the energy supply system reaches the condition of starting the compressor of the ice making system, the ice making system starts to work, so that a large part of energy is wasted before the compressor is started and after the compressor is stopped, the ice making efficiency is influenced, the energy utilization condition of the solar cold storage system adopting the single variable frequency compressor is shown in fig. 2, the area contained by the curve in the graph is the power provided by the distributed photovoltaic energy supply system, the shaded square area is the power consumed by the ice making system, and the white part is the unused wasted power.

After optimization, the compressor system is mainly formed by connecting two variable frequency compressors in parallel, the rated power of the two variable frequency compressors is equal to the rated power of the original compressor, the energy utilization condition of the ice cold storage refrigeration house system driven by the distributed photovoltaic energy of the two parallel variable frequency compressors is shown in figure 3, and after the compressor system is formed by the two variable frequency compressors, the maximum utilization of the output power of the photovoltaic array can be realized, and the photovoltaic refrigeration efficiency is improved. The structure of the inverter compressor system is shown in FIG. 4. The compressor starting control strategy of the compressor system is optimized, in the running process of the system, firstly, a high-power variable-frequency compressor I is started, the running speed of the compressor I is increased along with the increase of solar irradiance in the morning until the running speed of the compressor I reaches the maximum value, when the running speed of the compressor reaches the maximum value, the solar irradiance still does not reach the maximum value, at the moment, a variable-frequency compressor II is started, the compressor I runs at the maximum rated speed, the residual electric energy after the compressor I is driven to run at the maximum speed drives the compressor II, along with the increase of the solar irradiance, the running speed of the compressor I keeps the rated maximum value, the running speed of the compressor II is gradually increased until the solar irradiance reaches the maximum value, at the moment, the running speed of the compressor II also reaches the rated maximum value, and thereafter, the solar irradiance is, the operation rotating speed of the compressor II is reduced, the operation rotating speed of the compressor I is kept unchanged, when the solar irradiance is reduced to the extent that the compressor I can only be driven, the compressor II stops working at the moment, the operation of the compressor I is only kept, and along with the continuous reduction of the solar irradiance, the operation rotating speed of the compressor I is correspondingly reduced.

The beneficial effects of the utility model are that optimize through the compressor system to a photovoltaic directly drives freezer energy flow control system, for traditional compressor, not only the maximize utilize solar energy, still improved ice-making efficiency greatly, adopt the mode of limit cold-storage limit cold-supply simultaneously to give the freezer cooling, it is extravagant to have reduced the energy as far as possible, opens through intelligent control compressor system and stops the opportunity, realizes the best coupling of energy supply and energy consumption unit.

Drawings

Fig. 1 is a flow chart of the work process of the solar energy cold storage system provided by the present invention.

Fig. 2 shows the energy utilization condition of the solar energy cold storage system using the single inverter compressor of the present invention.

Fig. 3 is the utility model provides an adopt the solar energy cold storage system energy utilization condition of two parallelly connected compressors of frequency conversion.

Fig. 4 is the structure diagram of the inverter compressor system provided by the utility model.

Detailed Description

The following further explains the specific implementation mode of the photovoltaic direct-drive refrigeration house energy flow control system in combination with the attached drawings. The photovoltaic direct-drive refrigeration house energy flow control system is composed of a photovoltaic array, a photovoltaic inverse control and frequency conversion all-in-one machine, a compressor controller, a compressor system, a condenser, a throttle valve, an evaporator, a circulating water pump, an electromagnetic valve, a one-way valve, a proportion adjusting valve and an air cooler, and the operation flow chart of the system is shown in figure 1.

The compressor system is formed by connecting two alternating current compressors in parallel, an inverter is required to be arranged correspondingly at the moment, in the running process of the system, a high-power variable frequency compressor I is started, the running speed of the compressor I is increased along with the increase of solar irradiance in the morning until the running speed of the compressor I reaches the maximum value, the solar irradiance still does not reach the maximum value after the running speed of the compressor reaches the maximum value, at the moment, a variable frequency compressor II is started, the compressor I runs at the maximum rated speed, the residual electric energy after the compressor I is driven to run at the maximum speed drives the compressor II, the running speed of the compressor I keeps the rated maximum value along with the increase of the solar irradiance, the running speed of the compressor II is gradually increased until the solar irradiance reaches the maximum value, at the moment, the running speed of the compressor II also reaches the rated maximum value, and the solar, meanwhile, the running rotating speed of the compressor II is reduced, the running rotating speed of the compressor I is kept unchanged, when the solar irradiance is reduced to be capable of only driving the compressor I, the compressor II stops working at the moment, only the compressor I is kept running, and the running rotating speed of the compressor I is correspondingly reduced along with the continuous reduction of the solar irradiance.

Claims (2)

1. The utility model provides a freezer energy flow control system is directly driven to photovoltaic, its characterized in that mainly by the photovoltaic array, photovoltaic inverter frequency conversion all-in-one, the compressor controller, the compressor system, the condenser, the choke valve, the evaporimeter, circulating water pump, the solenoid valve, the check valve, proportional control valve and air-cooler are constituteed, take maximum power tracking's controller input to connect the photovoltaic array, the output connects the dc-to-ac converter, the compressor controller drives the compressor system, compressor system output connects gradually condenser, the choke valve, receive the evaporimeter in the ice-storage bucket again, supply the freezer with cold volume through the solenoid valve, the check valve, proportional control valve through circulating water pump at last.

2. The energy flow control system of the photovoltaic direct-driven refrigeration house according to claim 1, characterized in that the compressor system is composed of two inverter compressors connected in parallel, the inverter compressor system is composed of a high-power inverter compressor and a low-power inverter compressor which are connected in parallel for operation, and the rated total power of the two compressors is equal to the maximum power of the photovoltaic array.

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