The Obama administration and the European Union have each decided to negotiate settlements with China in the world’s largest antidumping and antisubsidy trade cases involving China’s roughly $30 billion a year in solar panel shipments to the West, officials and trade advisers in Beijing, Brussels and Washington said.

The plan that is starting to take shape would essentially carve up the global solar panel market into a series of regional markets. It would sharply raise the price of solar panels exported from China, the world’s dominant producer, by requiring Chinese companies to charge more while limiting the total number of solar panels they could ship.

In exchange, Chinese companies would no longer be charged steep taxes on their exports of solar panels. The United States is already collecting tariffs totaling about 30 percent while the European Union is expected to impose similar tariffs of about 50 percent on June 5, and may backdate them to March 5.