Foreword
Guangchai's complementary power generation is a process that uses photovoltaic power generation as the mainstay and diesel power generation as the supplement to supply power to the load and store excess electrical energy into the battery. It has obvious advantages in terms of stability and continuous supply of electricity.
This article will introduce the solution of Guangchai complementary project in detail from application scenarios, cost advantages, project cases, control principles, and program characteristics.
1. Application scenarios
In many remote or island areas at home and abroad, with insufficient grid coverage and unstable grid, diesel will be used to generate electricity. Due to the remoteness of the place, once the generator fails, it is difficult to repair it in time, which will inevitably affect work and life. Secondly, the noise and pollution of diesel generators cannot be solved.
On the other hand, the unstable power quality of diesel power generation is not good, and it is easy to cause impact on the load. It is difficult for simple photovoltaic power generation to meet the actual load demand.
The automatic voltage stabilization function of the diesel-electric hybrid can improve the power supply quality of the diesel-electric hybrid power generation system. When the photovoltaic power generation cannot meet the requirements, switch to the diesel generator to realize continuous power generation.
Therefore, the complementarity of light and diesel is a good solution to the above problems, and the hybrid power station also helps to reduce carbon dioxide emissions and reduce the cost of power generation.
Second, the cost of electricity comparison
The cost of diesel power generation is relatively large. In general, the conversion efficiency of diesel generators is about 31%. Taking Cummins 50Kw generator as an example: 1kW consumes 216g [{(216 * generator power number) / 1000} * diesel price per liter] / generator power number = The diesel consumption per kilowatt-hour is based on the current 0 # diesel 7.6 yuan / liter. The cost per kilowatt-hour is about 1.6 yuan, while the cost of photovoltaic power is basically about 0.5 yuan.
In addition, the price of diesel as a consumable is also increasing day by day. The maintenance of photovoltaic power generation in the later stage of operation and maintenance of the project is also simpler than that of diesel generators, and the cost is correspondingly more saving. Not to mention the huge carbon emission advantages of photovoltaic power generation for diesel engines.
3. Case of Guangchai Complementary Project
Take the Gudwei Nepal Medical University 500kW Guangchai complementary project as an example.
The project uses DEIF's fully automatic sustainable energy controller (ASC) to achieve a reliable, fully integrated and optimized connection between sustainable power generation equipment and generator sets.
ASC is fully compatible with DEIF power management system technology, adopts modular design, has scalability and flexibility, and supports multiple working modes such as off-grid, on-grid and off-grid / grid combination. It has the functions of circuit breaker control in accordance with the grid specifications, rapid shutdown of sustainable power supply, directional power supply protection and mains power failure protection. The photovoltaic controller ASC-4 + DEIF diesel controller can realize the function of power management.
4. Power plant control logic
1. In the power outage or off-grid state, the grid-connected inverter can be operated under the diesel power grid.
The power station needs at least one diesel generator set to be online, and the minimum load power of the diesel generator set needs to be set.
The load is less than the photovoltaic capacity:
A diesel generator set will run with the minimum load power, and the excess load is supplied by the photovoltaic; if the load is less than the minimum load power setting value of the diesel generator set, the load is completely responded by the diesel generator set.
The load is equal to the photovoltaic capacity:
A diesel generator set will run at the minimum load power, the load power is the minimum set value of the diesel generator set load power, and the remaining load is provided by photovoltaic.
The load is greater than the photovoltaic capacity:
A diesel generator set will run with the minimum load power, and the remaining power is supplied by the photovoltaic. When the load is greater than the photovoltaic capacity and the minimum load of a diesel generator set, the excess load is responded by the diesel generator set. Load size to start and stop the group.
2. When the load changes suddenly, the diesel generator set first responds to the load change, and the system adjusts through the communication between the controllers.
Five, the advantages of the program
A hybrid solar power system can achieve better utilization of renewable energy.
Because stand-alone systems that use renewable energy are usually designed according to the worst-case scenario, and because renewable energy is variable and unstable, the system must be designed for the period of least energy production. Because the system is designed according to the worst case, the capacity of the system is too large at other times. The excess energy generated during the period of the highest peak of solar irradiation cannot be used and wasted. As a result, the performance of the entire independent system is reduced. If the worst month situation is very different from other months, it may result in wasted energy equal to or even exceeding the design load demand.
Has a high system practicality.
In the independent system, the change and instability of renewable energy will cause the system to fail to meet the load demand, that is, there is a load power shortage. Using a hybrid system will greatly reduce the load power shortage rate.
Compared with a single-use diesel generator system, it has less maintenance and uses less fuel.
Higher fuel efficiency.
In the case of low load, the fuel utilization rate of the diesel engine is very low, which will cause fuel waste. In the hybrid system, comprehensive control can be performed to make the diesel engine work near the rated power, thereby improving fuel efficiency.
Better flexibility in load matching.
After using the hybrid system, because the diesel generator can provide greater power immediately, the hybrid system can be applied to a wider range of load systems, such as the use of larger AC loads, shock loads, etc. It can also better match the load and system power generation. As long as the backup energy is turned on during the peak load period, it can be easily done. Sometimes, the size of the load determines the need to use a hybrid system. Large loads require large currents and high voltages. If you just use solar energy, the cost will be high.
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