When is the best time to test solar power plants?
Grid code testing for solar power plants is best performed from early spring to autumn. The timing of tests is usually determined by the project schedule or milestones set by the grid code. According to grid requirements, some tests must be conducted at a specific threshold power, which is tied to the plant’s rated capacity. This makes test execution uncertain and poorly predictable due to weather-dependent production. Spring, summer, and early autumn are excellent times to test solar power plants before the panels become covered with snow.
Prepare for tests well in advance
It’s advisable to prepare for tests well in advance, and in Finland, the test plan should be submitted to the relevant grid company at least two months before grid compliance tests. Ampner coordinates test arrangements with other relevant parties. Representatives from both transmission and distribution system operators may attend the test day. Often, customers, controller or inverter manufacturers, and the connecting party’s representative are also present.
Test day: Who does what and why hire an expert?
Ampner’s role is to dictate the pace of tests, ensure tests are performed according to the test program, and make sure that the desired data is captured. It’s important to know what should be done and notice when something different from what was agreed upon is being done. A competent test leader can avoid the need to repeat tests. The test leader has a significant responsibility in understanding the big picture, including the control logic of the project and operating the power plant and controllers to perform the desired tests.
Grid compliance tests are performed when the power plant is fully commissioned and operating with final control parameter settings. Typically, tests are performed during one working day, but in the case of hybrid power plants, tests can be spread over multiple days. Ampner can perform the measurements during tests with its own measurement equipment or coordinate them with the equipment supplier if compliant meters are already installed on site. Ampner has accumulated extensive experience in performing grid compliance tests remotely, which is possible, for example, in Finland.
After testing: How to ensure approval?
After the tests, the data is processed and compiled into a test report, which is submitted to the grid company within three months of testing. The raw data is also structured and packaged according to requirements. Ampner invests in development regarding test data processing, utilizing various scripts that reduce human errors and enhance efficiency.
Experience matters in testing solar power projects
Ampner specializes in grid code compliance verification, including modeling and simulations, as well as the equally important aspect of testing. Whether it’s a larger C or D-type solar power project or a smaller project under 10 MW connecting to the medium-voltage network, Ampner is a reliable partner in testing and obtaining commissioning permission for your projects.
